微信支付-超详细java开发-小程序对接

阳光穿透心脏的1/2处 2024-04-03 12:39 76阅读 0赞

#### 文章目录 ####

*   *  前言
     *  微信支付接入前准备
     *   *   *  1.思路介绍
             *  2.如何注册小程序账号？
             *  3.如何接入微信支付，需要准备哪些东西？
             *  4.小程序接入前的准备（APPID及mchid以上两步已拿到，只需配置一下API KEY即可）
     *  微信支付-完整代码
     *   *  前端代码
         *   *  效果图
         *  后端代码
     *  微信小程序支付功能完整流程-总结(可忽略)
     *   *  获取令牌token
         *  创建订单
         *  预支付
         *  发起微信支付
         *  收尾工作

### 前言 ###

本文适用于有一定基础的开发者，简单易通。后台用的的是java，我用的是springBoot，其它框架基本同理，前端就是一个简单的demo。微信官方提供了V2和V3两种方式，本文基于V2版支付开发（后续更新V3）。[V2和V3版本区别][V2_V3]

### 微信支付接入前准备 ###

##### 1.思路介绍 #####

本次以微信小程序开发为例，如果自己想要玩一下，需要在[微信公众平台][Link 1]注册一个小程序账号，其次[微信支付][Link 2]  
平台，进行接入微信支付，然后就可以着手开发了。（公司开发的话，参数账号之类都会提供的，不用担心）

##### 2.如何注册小程序账号？ #####

可以直接进入微信公众平台直接注册，也可根据文档指引进行注册。[申请账号官方详细文档][Link 3]  
如商户已拥有自己的APP，且希望该APP接入微信支付，请前往 [开放平台][Link 4]申请  
![在这里插入图片描述][897728ebdecc4eaca407068fe258fd5d.png_pic_center]

##### 3.如何接入微信支付，需要准备哪些东西？ #####

简单介绍一下自己的经验，重点是营业执照信息。关键这玩意怎么搞方面快捷呢。  
我提供两种方案：  
1.最方便的是自己注册个电商营业执照，拼多多商铺0元直接入驻即可。注册地址要和营业执照地址相同（要有房产证明等，写自己老家就行）。  
2.如果自己租的房子，合同中必须体现可以作为商铺，要不然没法。 直接注册实体个体工商户，目前非常方便线下线上都可以办理-不同地方的软件不同 这里以杭州为例，直接下载浙里办-搜索个体工商户，在线办理即可。  
最重要的是地址（可以借助朋友，或者租房的时候说好可以作为商铺，当然自己本地有房子咋样搞都行），其次网上那些挂靠地址等，如果你可以承担费用，自主决定。  
请参考[微信支付商户号申请][Link 5]，详细的一批。

##### 4.小程序接入前的准备（APPID及mchid以上两步已拿到，只需配置一下API KEY即可） #####

官方文档指引-[小程序支付][Link 6]  
注意：API秘钥，一定要记住。最好记事本记录一下。  
由于本文基于V2版支付开发，记得设置一下。  
![在这里插入图片描述][c0ee4680be2a40a49c6cd8a45ff90050.png_pic_center]

### 微信支付-完整代码 ###

#### 前端代码 ####

> index.wxml

> index.js

##### 效果图 #####

![在这里插入图片描述][69eb1b4801a64666b618cf7facf5009d.png_pic_center]

#### 后端代码 ####

> pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.7.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.hn.yuan</groupId>
        <artifactId>demo_wxpay</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>demo_wxpay</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
    
            
            <dependency>
                <groupId>org.jdom</groupId>
                <artifactId>jdom2</artifactId>
                <version>2.0.6</version>
            </dependency>
            
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.6</version>
            </dependency>
            
            <dependency>
                <groupId>commons-io</groupId>
                <artifactId>commons-io</artifactId>
                <version>2.11.0</version>
            </dependency>
    
            <dependency>
                <groupId>org.bouncycastle</groupId>
                <artifactId>bcprov-jdk16</artifactId>
                <version>1.46</version>
            </dependency>
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.21</version>
            </dependency>
    
            
            <dependency>
                <groupId>com.github.wechatpay-apiv3</groupId>
                <artifactId>wechatpay-apache-httpclient</artifactId>
                <version>0.4.8</version>
            </dependency>
    
            
            <dependency>
                <groupId>commons-httpclient</groupId>
                <artifactId>commons-httpclient</artifactId>
                <version>3.1</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.3.0</version>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.35</version>
            </dependency>
    
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-generator</artifactId>
                <version>3.3.0</version>
            </dependency>
            <dependency>
                <groupId>org.apache.velocity</groupId>
                <artifactId>velocity-engine-core</artifactId>
                <version>2.1</version>
            </dependency>
    
    
            
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

> application.yml

server:
      port: 8081
    
    spring:
        datasource:
            driver-class-name: com.mysql.jdbc.Driver
            url: jdbc:mysql://localhost:3306/yuan_productlist?useUnicode=true&characterEncoding=UTF-8&useSSL=false
            username: root
            password: root
    # 配置slq打印日志
    mybatis-plus:
      configuration:
        log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    
    log.path: F:/logs	#打印日志路径

> logback.xml

<?xml version="1.0" encoding="UTF-8"?>
    <configuration>
        
        <property resource="application.yml"/>
        
        <springProperty scope="context" name="LOG_HOME" source="log.path"/>
        
        
        <property name="LOG_LEVEL" value="INFO" />
        
        <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
            <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
                
                <pattern>%d{
        yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{
        50} - %msg%n</pattern>
            </encoder>
        </appender>
        
        <appender name="FILE"  class="ch.qos.logback.core.rolling.RollingFileAppender">
            <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                
                <FileNamePattern>${
        LOG_HOME}/springbootjpa.log.%d{
        yyyy-MM-dd}.log</FileNamePattern>
                
                <MaxHistory>30</MaxHistory>
            </rollingPolicy>
            <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
                
                <pattern>%d{
        yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{
        50} - %msg%n</pattern>
            </encoder>
            
            <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
                <MaxFileSize>10MB</MaxFileSize>
            </triggeringPolicy>
        </appender>
    
        <logger name="com.wm.springbootjpa01" level="INFO"/>
        <logger name="org.apache.ibatis" level="${LOG_LEVEL}"/>
        <logger name="org.mybatis.spring" level="${LOG_LEVEL}"/>
        <logger name="org.springframework" level="${LOG_LEVEL}"/>
        <logger name="java.sql.Connection" level="${LOG_LEVEL}"/>
        <logger name="java.sql.Statement" level="${LOG_LEVEL}"/>
        <logger name="java.sql.PreparedStatement" level="${LOG_LEVEL}"/>
    
        
        <logger name="jdbc.connection" level="OFF"/>
        <logger name="jdbc.resultset" level="OFF"/>
        <logger name="jdbc.resultsettable" level="OFF"/>
        <logger name="jdbc.audit" level="OFF"/>
        <logger name="jdbc.sqltiming" level="INFO"/>
        <logger name="jdbc.sqlonly" level="OFF"/>
    
        
        <root level="${LOG_LEVEL}">
            <appender-ref ref="STDOUT" />
            <appender-ref ref="FILE" />
        </root>
    </configuration>

> WechatConfig支付配置类

package com.hn.yuan.wxinterface;
    
    /**
     * 支付配置类
     * @author XIAOCAO
     **/
    public class WechatConfig {
        
        //小程序appid(开发者在微信公众平台查询)
        public static final String appid ="";
        //小程序appkey(开发者在微信公众平台查询)
        public static final String APP_SECRET="";
        //微信支付的商户id(开发者在微信商户平台查询)
        public static final String mch_id = "";
        //微信支付的商户密钥(开发者在微信商户平台查询)
        public static final String key = "";
        //支付成功后的服务器回调url（后台随便的一个接口能接收到就行，有效地址）
        public static final String notify_url = "";
        //签名方式，固定值
        public static final String SIGNTYPE = "MD5";
        //交易类型，小程序支付的固定值为JSAPI
        public static final String TRADETYPE = "JSAPI";
        //微信统一下单接口地址
        public static final String pay_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    }

> WxPayDto类

package com.hn.yuan.entity;
    
    import lombok.Data;
    
    import java.io.Serializable;
    
    
    @Data
    public class WxPayDto implements Serializable {
        
    
        private static final long serialVersionUID = 1L;
        private String partyOrg;
        private String duesDate;
        private String money;   //缴费金额
        private String name;
        private String idCard;
        private String post;
        private String phone;
        private String orderId;
        private String receiverInfo;
        private String code;//获取openid临时凭证
        private String agyCode;
        private String agyName;
    
    }

> 业务代码WxpayController

package com.hn.yuan.controller;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import com.hn.yuan.entity.WxPayDto;
    import com.hn.yuan.wxinterface.*;
    import org.apache.commons.lang3.StringUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.client.RestTemplate;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.math.BigDecimal;
    import java.security.KeyManagementException;
    import java.security.KeyStoreException;
    import java.security.NoSuchAlgorithmException;
    import java.util.HashMap;
    import java.util.Map;
    
    import static com.hn.yuan.wxinterface.WXPayConstants.RETURN_CODE;
    import static com.hn.yuan.wxinterface.WechatConfig.APP_SECRET;
    
    @CrossOrigin
    @RestController
    @RequestMapping("/wechatPay")
    public class WxpayController {
        
        private static Logger logger = LoggerFactory.getLogger(WxpayController.class);
    
        @Autowired
        private HttpServletRequest request;
    
        @Resource
        private HttpServletResponse response;
    
    
        @PostMapping("/wxPay")
        public String wxPay(@RequestBody WxPayDto dto) {
        
            System.out.println("进来方法了");
            Object result = new Object();
            try {
        
                //获取客户端的ip地址
                String spbill_create_ip = getIpAddr(request);
                System.out.println("客户端Ip地址" + spbill_create_ip);
                System.out.println("code是什么样式的" + dto.getCode());
                //获取openid
                String openid = getOpenId(dto.getCode());
                //订单号  uuid  随机生成
                String outTradeNo = WXPayUtil.generateUUID();
                //支付业务
                result = wxPay(spbill_create_ip, openid, outTradeNo, dto);
            } catch (Exception e) {
        
                e.printStackTrace();
            }
            return PayUtil.toJson(result);
        }
    
    
        //获取IP
        private String getIpAddr(HttpServletRequest request) {
        
            String ip = request.getHeader("X-Forwarded-For");
            if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
        
                //多次反向代理后会有多个ip值，第一个ip才是真实ip
                int index = ip.indexOf(",");
                if (index != -1) {
        
                    return ip.substring(0, index);
                } else {
        
                    return ip;
                }
            }
            ip = request.getHeader("X-Real-IP");
            if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
        
                return ip;
            }
            return request.getRemoteAddr();
        }
    
        /**
         * 缴纳费用
         **/
        public Map wxPay(String spbill_create_ip, String openId, String orderNumber, WxPayDto dto) {
        
            Map<String, String> payMap = new HashMap<String, String>();//返回给小程序端需要的参数
            try {
        
                logger.info("【小程序支付】 统一下单开始, 订单编号=" + orderNumber);
                //商品名称
                String body = dto.getAgyName() + "-" + dto.getName() + "-测试费用";
                //获取客户端的ip地址
                BigDecimal money = new BigDecimal(dto.getMoney());
                //组装参数，用户生成统一下单接口的签名
                logger.info("----------下单接口签名-------");
                Map<String, String> packageParams = new HashMap<>();
                //微信分配的小程序ID
                packageParams.put("appid", WechatConfig.appid);
                //微信支付分配的商户号
                packageParams.put("mch_id", WechatConfig.mch_id);
                //随机字符串
                packageParams.put("nonce_str", System.currentTimeMillis() / 1000 + "");
                //签名类型
                packageParams.put("sign_type", "MD5");
                //充值订单 商品描述
                packageParams.put("body", body);
                //商户订单号
                packageParams.put("out_trade_no", orderNumber);
                //订单总金额，单位为分
                packageParams.put("total_fee", money.multiply(BigDecimal.valueOf(100)).intValue() + "");
                //终端IP
                packageParams.put("spbill_create_ip", spbill_create_ip);
                //通知回调地址
                packageParams.put("notify_url", WechatConfig.notify_url);
                //交易类型
                packageParams.put("trade_type", WechatConfig.TRADETYPE);
                //用户标识
                packageParams.put("openid", openId);
                //第一次签名
                String sign = WXPayUtil.generateSignature(packageParams, WechatConfig.key);
                System.out.println("第一签名打印的是个啥" + sign);
                packageParams.put("sign", sign);
                System.out.println("字符串是啥" + PaymentKit.toXml(packageParams));
                //调用支付定义下单API,返回预付单信息 prepay_id
                String result = HttpKit.post(WechatConfig.pay_url, PaymentKit.toXml(packageParams));
                logger.info("调试模式_统一下单接口 返回XML数据：" + result);
                // 将解析结果存储在HashMap中
                Map<String, String> map = PaymentKit.xmlToMap(result);
                String return_code = map.get("return_code");//返回状态码
                String result_code = map.get("result_code");//返回状态码
                if (return_code.equals("SUCCESS") || return_code.equals(result_code)) {
        
                    //返回的预付单信息
                    String prepay_id = map.get("prepay_id");
                    payMap.put("appId", WechatConfig.appid);
                    payMap.put("timeStamp", System.currentTimeMillis() / 1000 + "");
                    payMap.put("nonceStr", System.currentTimeMillis() + "");
                    payMap.put("package", "prepay_id=" + prepay_id);
                    payMap.put("signType", "MD5");
    
                    //再次签名，这个签名用于小程序端调用wx.requesetPayment方法
                    String paySign = WXPayUtil.generateSignature(payMap, WechatConfig.key);
                    System.out.println("第二签名打印的是个啥" + sign);
                    logger.info("=======================第二次签名：", paySign + "============ ======");
                    payMap.put("paySign", paySign);
                    payMap.put("status", "success");
                    //更新订单信息
                } else {
        
                    logger.info("----------统一下单失败-------");
                    payMap.put("status", "error");
                    return payMap;
                }
            } catch (Exception e) {
        
                e.printStackTrace();
            }
            return payMap;
        }
    
        /**
         * 小程序获取openid
         *
         * @return
         */
        public static String getOpenId(String code) throws NoSuchAlgorithmException, KeyStoreException, KeyManagementException {
        
            RestTemplate restTemplate = new RestTemplate();
            String url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + WechatConfig.appid + "&secret=" + APP_SECRET + "&js_code=" + code + "&grant_type=authorization_code";
            ResponseEntity<String> responseEntity =
                    restTemplate.getForEntity(url, String.class);
            String body = responseEntity.getBody();
            JSONObject object = JSON.parseObject(body);
            String openId = object.getString("openid");// 获取openId
            System.out.println("该用户的openid——>" + openId);
            return openId;
        }
    
    
        /**
         * 功能描述: <小程序回调>
         *
         * @return:
         **/
        @GetMapping("/wxProPayNotify")
        public void wxProPayNotify() throws Exception {
        
            logger.info("进入微信小程序支付回调");
            String xmlMsg = HttpKit.readData(request);
            logger.info("微信小程序通知信息" + xmlMsg);
            Map<String, String> resultMap = PaymentKit.xmlToMap(xmlMsg);
            if (resultMap.get(RETURN_CODE).equals("SUCCESS")) {
        
                String orderNo = resultMap.get("out_trade_no");
                logger.info("微信小程序支付成功,订单号{}", orderNo);
                //通过订单号 修改数据库中的记录,业务操作
            }
            String result = "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>";
            try {
        
                response.getWriter().write(result);
            } catch (IOException e) {
        
                e.printStackTrace();
            }
        }
    
    }

> 工具类

*  http,https-request类

package com.hn.yuan.wxinterface;
    
    import javax.net.ssl.*;
    import javax.servlet.http.HttpServletRequest;
    import java.io.*;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLEncoder;
    import java.security.KeyManagementException;
    import java.security.NoSuchAlgorithmException;
    import java.security.NoSuchProviderException;
    import java.security.SecureRandom;
    import java.security.cert.CertificateException;
    import java.security.cert.X509Certificate;
    import java.util.Iterator;
    import java.util.Map;
    
    /**
     * http,https-request类
     **/
    public class HttpKit {
        
        private static String CHARSET = "UTF-8";
        private static final SSLSocketFactory sslSocketFactory = initSSLSocketFactory();
        private static final TrustAnyHostnameVerifier trustAnyHostnameVerifier = new HttpKit().new TrustAnyHostnameVerifier();
    
        private HttpKit() {
        
        }
    
        private static SSLSocketFactory initSSLSocketFactory() {
        
            try {
        
                TrustManager[] e = new TrustManager[]{
        new HttpKit().new TrustAnyTrustManager()};
                SSLContext sslContext = SSLContext.getInstance("TLS");
                sslContext.init((KeyManager[])null, e, new SecureRandom());
                return sslContext.getSocketFactory();
            } catch (Exception var2) {
        
                throw new RuntimeException(var2);
            }
        }
    
        public static void setCharSet(String charSet) {
        
            if(charSet!=null && !charSet.equals("")) {
        
                throw new IllegalArgumentException("charSet can not be blank.");
            } else {
        
                CHARSET = charSet;
            }
        }
    
        private static HttpURLConnection getHttpConnection(String url, String method, Map<String, String> headers) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
        
            URL _url = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)_url.openConnection();
            if(conn instanceof HttpsURLConnection) {
        
                ((HttpsURLConnection)conn).setSSLSocketFactory(sslSocketFactory);
                ((HttpsURLConnection)conn).setHostnameVerifier(trustAnyHostnameVerifier);
            }
    
            conn.setRequestMethod(method);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setConnectTimeout(19000);
            conn.setReadTimeout(19000);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("AuthUser-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
            if(headers != null && !headers.isEmpty()) {
        
                Iterator i$ = headers.entrySet().iterator();
    
                while(i$.hasNext()) {
        
                    Map.Entry entry = (Map.Entry)i$.next();
                    conn.setRequestProperty((String)entry.getKey(), (String)entry.getValue());
                }
            }
    
            return conn;
        }
    
        public static String get(String url, Map<String, String> queryParas, Map<String, String> headers) {
        
            HttpURLConnection conn = null;
            String e;
            try {
        
                conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), "GET", headers);
                conn.connect();
                e = readResponseString(conn);
            } catch (Exception var8) {
        
                throw new RuntimeException(var8);
            } finally {
        
                if(conn != null) {
        
                    conn.disconnect();
                }
            }
            return e;
        }
    
        public static String get(String url, Map<String, String> queryParas) {
        
            return get(url, queryParas, (Map)null);
        }
    
        public static String get(String url) {
        
            return get(url, (Map)null, (Map)null);
        }
    
        public static String post(String url, Map<String, String> queryParas, String data, Map<String, String> headers) {
        
            HttpURLConnection conn = null;
    
            String var6;
            try {
        
                conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), "POST", headers);
                conn.connect();
                OutputStream e = conn.getOutputStream();
                e.write(data.getBytes(CHARSET));
                e.flush();
                e.close();
                var6 = readResponseString(conn);
            } catch (Exception var10) {
        
                throw new RuntimeException(var10);
            } finally {
        
                if(conn != null) {
        
                    conn.disconnect();
                }
            }
            return var6;
        }
    
        public static String post(String url, Map<String, String> queryParas, String data) {
        
            return post(url, queryParas, data, (Map)null);
        }
    
        public static String post(String url, String data, Map<String, String> headers) {
        
            return post(url, (Map)null, data, headers);
        }
    
        public static String post(String url, String data) {
        
            return post(url, (Map)null, data, (Map)null);
        }
    
        private static String readResponseString(HttpURLConnection conn) {
        
            StringBuilder sb = new StringBuilder();
            InputStream inputStream = null;
    
            try {
        
                inputStream = conn.getInputStream();
                BufferedReader e = new BufferedReader(new InputStreamReader(inputStream, CHARSET));
                String line = null;
    
                while((line = e.readLine()) != null) {
        
                    sb.append(line).append("\n");
                }
    
                String var5 = sb.toString();
                return var5;
            } catch (Exception var14) {
        
                throw new RuntimeException(var14);
            } finally {
        
                if(inputStream != null) {
        
                    try {
        
                        inputStream.close();
                    } catch (IOException var13) {
        
                    }
                }
    
            }
        }
    
        private static String buildUrlWithQueryString(String url, Map<String, String> queryParas) {
        
            if(queryParas != null && !queryParas.isEmpty()) {
        
                StringBuilder sb = new StringBuilder(url);
                boolean isFirst;
                if(url.indexOf("?") == -1) {
        
                    isFirst = true;
                    sb.append("?");
                } else {
        
                    isFirst = false;
                }
    
                String key;
                String value;
                for(Iterator i$ = queryParas.entrySet().iterator(); i$.hasNext(); sb.append(key).append("=").append(value)) {
        
                    Map.Entry entry = (Map.Entry)i$.next();
                    if(isFirst) {
        
                        isFirst = false;
                    } else {
        
                        sb.append("&");
                    }
    
                    key = (String)entry.getKey();
                    value = (String)entry.getValue();
                    if(value!=null && !value.equals("")) {
        
                        try {
        
                            value = URLEncoder.encode(value, CHARSET);
                        } catch (UnsupportedEncodingException var9) {
        
                            throw new RuntimeException(var9);
                        }
                    }
                }
    
                return sb.toString();
            } else {
        
                return url;
            }
        }
    
        public static String readData(HttpServletRequest request) {
        
            BufferedReader br = null;
    
            try {
        
                StringBuilder e = new StringBuilder();
                br = request.getReader();
                String line = null;
    
                while((line = br.readLine()) != null) {
        
                    e.append(line).append("\n");
                }
    
                line = e.toString();
                return line;
            } catch (IOException var12) {
        
                throw new RuntimeException(var12);
            } finally {
        
                if(br != null) {
        
                    try {
        
                        br.close();
                    } catch (IOException var11) {
        
                    }
                }
    
            }
        }
    
        /** @deprecated */
        @Deprecated
        public static String readIncommingRequestData(HttpServletRequest request) {
        
            return readData(request);
        }
    
    
        private class TrustAnyTrustManager implements X509TrustManager {
        
            private TrustAnyTrustManager() {
        
            }
    
            public X509Certificate[] getAcceptedIssuers() {
        
                return null;
            }
    
            public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        
            }
    
            public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        
            }
        }
    
        private class TrustAnyHostnameVerifier implements HostnameVerifier {
        
            private TrustAnyHostnameVerifier() {
        
            }
    
            public boolean verify(String hostname, SSLSession session) {
        
                return true;
            }
        }
    
    
    }

>  *  微信支付api

package com.hn.yuan.wxinterface;
    
    import java.io.UnsupportedEncodingException;
    import java.util.HashMap;
    import java.util.Map;
    
    
    /**
     * 微信支付api
     * @author XIAOCAO
     * @version 2020/12/25
     **/
    public class PaymentApi {
        
    
        private PaymentApi() {
        }
    
        // 文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
        private static String unifiedOrderUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    
        /**
         * 交易类型枚举
         * WAP的文档：https://pay.weixin.qq.com/wiki/doc/api/wap.php?chapter=15_1
         * @author L.cm
         * <pre>
         * email: 596392912@qq.com
         * site: http://www.dreamlu.net
         * date: 2015年10月27日 下午9:46:27
         * </pre>
         */
        public enum TradeType {
        
            JSAPI, NATIVE, APP, WAP, MWEB
        }
    
        /**
         * 统一下单
         * @param params 参数map
         * @return String
         */
        public static String pushOrder(Map<String, String> params) {
        
            return HttpKit.post(unifiedOrderUrl, PaymentKit.toXml(params));
        }
    
        private static Map<String, String> request(String url, Map<String, String> params, String paternerKey) {
        
            params.put("nonce_str", System.currentTimeMillis() + "");
            String sign = PaymentKit.createSign(params, paternerKey);
            params.put("sign", sign);
            String xmlStr = HttpKit.post(url, PaymentKit.toXml(params));
            return PaymentKit.xmlToMap(xmlStr);
        }
    
        /**
         * 文档说明：https://pay.weixin.qq.com/wiki/doc/api/wap.php?chapter=15_4
         * <pre>
         * @param appId 公众账号ID         是    String(32)    wx8888888888888888    微信分配的公众账号ID
         * 随机字符串         noncestr    是    String(32)    5K8264ILTKCH16CQ2502SI8ZNMTM67VS    随机字符串，不长于32位。推荐随机数生成算法
         * 订单详情扩展字符串    package        是    String(32)    WAP    扩展字段，固定填写WAP
         * @param prepayId 预支付交易会话标识    是    String(64)    wx201410272009395522657a690389285100    微信统一下单接口返回的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时
         * 签名                 sign        是    String(32)    C380BEC2BFD727A4B6845133519F3AD6    签名，详见签名生成算法
         * 时间戳            timestamp    是    String(32)    1414561699    当前的时间，其他详见时间戳规则
         * @param paternerKey 签名密匙
         * </pre>
         * @return {String}
         */
        public static String getDeepLink(String appId, String prepayId, String paternerKey) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("appid", appId);
            params.put("noncestr", System.currentTimeMillis() + "");
            params.put("package", "WAP");
            params.put("prepayid", prepayId);
            params.put("timestamp", System.currentTimeMillis() / 1000 + "");
            String sign = PaymentKit.createSign(params, paternerKey);
            params.put("sign", sign);
    
            String string1 = PaymentKit.packageSign(params, true);
    
            String string2 = "";
            try {
         string2 = PaymentKit.urlEncode(string1); } catch (UnsupportedEncodingException e) {
        }
    
            return "weixin://wap/pay?" + string2;
        }
    
        // 文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_2
        private static String orderQueryUrl = "https://api.mch.weixin.qq.com/pay/orderquery";
    
        /**
         * 根据商户订单号查询信息
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param transaction_id 微信订单号
         * @return 回调信息
         */
        public static Map<String, String> queryByTransactionId(String appid, String mch_id, String paternerKey, String transaction_id) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("appid", appid);
            params.put("mch_id", mch_id);
            params.put("transaction_id", transaction_id);
            return request(orderQueryUrl, params, paternerKey);
        }
    
        /**
         * 根据商户订单号查询信息
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param out_trade_no 商户订单号
         * @return 回调信息
         */
        public static Map<String, String> queryByOutTradeNo(String appid, String mch_id, String paternerKey, String out_trade_no) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("appid", appid);
            params.put("mch_id", mch_id);
            params.put("out_trade_no", out_trade_no);
            return request(orderQueryUrl, params, paternerKey);
        }
    
        // 文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_3
        private static String closeOrderUrl = "https://api.mch.weixin.qq.com/pay/closeorder";
    
        /**
         * 关闭订单
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param out_trade_no 商户订单号
         * @return 回调信息
         */
        public static Map<String, String> closeOrder(String appid, String mch_id, String paternerKey, String out_trade_no) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("appid", appid);
            params.put("mch_id", mch_id);
            params.put("out_trade_no", out_trade_no);
            return request(closeOrderUrl, params, paternerKey);
        }
    
        // 申请退款文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
        public static String refundUrl = "https://api.mch.weixin.qq.com/secapi/pay/refund";
    
    //    /**
    //     * 申请退款，内部添加了随机字符串nonce_str和签名sign
    //     * @param params 参数map，内部添加了随机字符串nonce_str和签名sign
    //     * @param paternerKey 商户密钥
    //     * @param certPath 证书文件目录
    //     * @return  map
    //     */
    //    public static Map<String, String> refund(Map<String, String> params, String paternerKey, String certPath) {
        
    //        params.put("nonce_str", System.currentTimeMillis() + "");
    //        String sign = PaymentKit.createSign(params, paternerKey);
    //        params.put("sign", sign);
    //        String partner = params.get("mch_id");
    //        String xmlStr = HttpKit.delegate.postSSL(refundUrl, PaymentKit.toXml(params), certPath, partner);
    //        return PaymentKit.xmlToMap(xmlStr);
    //    }
    
        // 查询退款文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_5
        private static String refundQueryUrl = "https://api.mch.weixin.qq.com/pay/refundquery";
    
        private static Map<String, String> baseRefundQuery(Map<String, String> params, String appid, String mch_id, String paternerKey) {
        
            params.put("appid", appid);
            params.put("mch_id", mch_id);
            return request(refundQueryUrl, params, paternerKey);
        }
    
        /**
         * 根据微信订单号查询退款
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param transaction_id 微信订单号
         * @return map
         */
        public static Map<String, String> refundQueryByTransactionId(String appid, String mch_id, String paternerKey, String transaction_id) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("transaction_id", transaction_id);
            return baseRefundQuery(params, appid, mch_id, paternerKey);
        }
    
        /**
         * 根据微信订单号查询退款
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param out_trade_no 商户订单号
         * @return map
         */
        public static Map<String, String> refundQueryByOutTradeNo(String appid, String mch_id, String paternerKey, String out_trade_no) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("out_trade_no", out_trade_no);
            return baseRefundQuery(params, appid, mch_id, paternerKey);
        }
    
        /**
         * 根据微信订单号查询退款
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param out_refund_no 商户退款单号
         * @return map
         */
        public static Map<String, String> refundQueryByOutRefundNo(String appid, String mch_id, String paternerKey, String out_refund_no) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("out_refund_no", out_refund_no);
            return baseRefundQuery(params, appid, mch_id, paternerKey);
        }
    
        /**
         * 根据微信订单号查询退款
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 商户密钥
         * @param refund_id 微信退款单号
         * @return map
         */
        public static Map<String, String> refundQueryByRefundId(String appid, String mch_id, String paternerKey, String refund_id) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("refund_id", refund_id);
            return baseRefundQuery(params, appid, mch_id, paternerKey);
        }
    
        private static String downloadBillUrl = "https://api.mch.weixin.qq.com/pay/downloadbill";
    
        /**
         * <pre>
         * ALL，返回当日所有订单信息，默认值
         * SUCCESS，返回当日成功支付的订单
         * REFUND，返回当日退款订单
         * REVOKED，已撤销的订单
         * </pre>
         */
        public static enum BillType {
        
            ALL, SUCCESS, REFUND, REVOKED
        }
    
        /**
         * 下载对账单
         * <pre>
         * 公众账号ID    appid        是    String(32)    wx8888888888888888    微信分配的公众账号ID（企业号corpid即为此appId）
         * 商户号        mch_id        是    String(32)    1900000109    微信支付分配的商户号
         * 设备号        device_info    否    String(32)    013467007045764    微信支付分配的终端设备号
         * 随机字符串    nonce_str    是    String(32)    5K8264ILTKCH16CQ2502SI8ZNMTM67VS    随机字符串，不长于32位。推荐随机数生成算法
         * 签名        sign        是    String(32)    C380BEC2BFD727A4B6845133519F3AD6    签名，详见签名生成算法
         * 对账单日期    bill_date    是    String(8)    20140603    下载对账单的日期，格式：20140603
         * 账单类型        bill_type    否    String(8)
         * </pre>
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 签名密匙
         * @param billDate 对账单日期
         * @return String
         */
        public static Map<String,String> downloadBill(String appid, String mch_id, String paternerKey, String billDate) {
        
            return downloadBill(appid, mch_id, paternerKey, billDate, null);
        }
    
        /**
         * 下载对账单
         * <pre>
         * 公众账号ID    appid        是    String(32)    wx8888888888888888    微信分配的公众账号ID（企业号corpid即为此appId）
         * 商户号        mch_id        是    String(32)    1900000109    微信支付分配的商户号
         * 设备号        device_info    否    String(32)    013467007045764    微信支付分配的终端设备号
         * 随机字符串    nonce_str    是    String(32)    5K8264ILTKCH16CQ2502SI8ZNMTM67VS    随机字符串，不长于32位。推荐随机数生成算法
         * 签名        sign        是    String(32)    C380BEC2BFD727A4B6845133519F3AD6    签名，详见签名生成算法
         * 对账单日期    bill_date    是    String(8)    20140603    下载对账单的日期，格式：20140603
         * 账单类型        bill_type    否    String(8)
         * </pre>
         * @param appid 公众账号ID
         * @param mch_id 商户号
         * @param paternerKey 签名密匙
         * @param billDate 对账单日期
         * @param billType 账单类型
         * @return String
         */
        public static Map<String,String> downloadBill(String appid, String mch_id, String paternerKey, String billDate, BillType billType) {
        
            Map<String, String> params = new HashMap<String, String>();
            params.put("appid", appid);
            params.put("mch_id", mch_id);
            params.put("nonce_str", System.currentTimeMillis() + "");
            params.put("bill_date", billDate);
            if (null != billType) {
        
                params.put("bill_type", billType.name());
            } else {
        
                params.put("bill_type", BillType.ALL.name());
            }
            String sign = PaymentKit.createSign(params, paternerKey);
            params.put("sign", sign);
            String str = HttpKit.post(downloadBillUrl, PaymentKit.toXml(params));
            return PaymentKit.xmlToMap(str);
    
        }
    
    }

>  *  微信支付的统一下单工具类

package com.hn.yuan.wxinterface;
    
    
    import org.apache.commons.io.Charsets;
    
    import java.io.UnsupportedEncodingException;
    import java.net.URLEncoder;
    import java.util.Map;
    import java.util.Map.Entry;
    import java.util.TreeMap;
    
    
    
    /**
     * 微信支付的统一下单工具类
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class PaymentKit {
        
    
        /**
         * 组装签名的字段
         * @param params 参数
         * @param urlEncoder 是否urlEncoder
         * @return String
         */
        public static String packageSign(Map<String, String> params, boolean urlEncoder) {
        
            // 先将参数以其参数名的字典序升序进行排序
            TreeMap<String, String> sortedParams = new TreeMap<String, String>(params);
            // 遍历排序后的字典，将所有参数按"key=value"格式拼接在一起
            StringBuilder sb = new StringBuilder();
            boolean first = true;
            for (Entry<String, String> param : sortedParams.entrySet()) {
        
                String value = param.getValue();
                if (Tools.isEmpty(value)) {
        
                    continue;
                }
                if (first) {
        
                    first = false;
                } else {
        
                    sb.append("&");
                }
                sb.append(param.getKey()).append("=");
                if (urlEncoder) {
        
                    try {
         value = urlEncode(value); } catch (UnsupportedEncodingException e) {
        }
                }
                sb.append(value);
            }
            return sb.toString();
        }
    
        /**
         * urlEncode
         * @param src 微信参数
         * @return String
         * @throws UnsupportedEncodingException 编码错误
         */
        public static String urlEncode(String src) throws UnsupportedEncodingException {
        
            return URLEncoder.encode(src, Charsets.UTF_8.name()).replace("+", "%20");
        }
    
        /**
         * 生成签名
         * @param params 参数
         * @param paternerKey 支付密钥
         * @return sign
         */
        public static String createSign(Map<String, String> params, String paternerKey) {
        
            // 生成签名前先去除sign
            params.remove("sign");
            String stringA = packageSign(params, false);
            String stringSignTemp = stringA + "&key=" + paternerKey;
            return Tools.md5(stringSignTemp).toUpperCase();
        }
    
        /**
         * 支付异步通知时校验sign
         * @param params 参数
         * @param paternerKey 支付密钥
         * @return {boolean}
         */
        public static boolean verifyNotify(Map<String, String> params, String paternerKey){
        
            String sign = params.get("sign");
            String localSign = PaymentKit.createSign(params, paternerKey);
            return sign.equals(localSign);
        }
    
        /**
         * 微信下单，map to xml
         * @param params 参数
         * @return String
         */
        public static String toXml(Map<String, String> params) {
        
            StringBuilder xml = new StringBuilder();
            xml.append("<xml>");
            for (Entry<String, String> entry : params.entrySet()) {
        
                String key   = entry.getKey();
                String value = entry.getValue();
                // 略过空值
                if (Tools.isEmpty(value)) continue;
                xml.append("<").append(key).append(">");
                xml.append(entry.getValue());
                xml.append("</").append(key).append(">");
            }
            xml.append("</xml>");
            return xml.toString();
        }
    
        /**
         * 针对支付的xml，没有嵌套节点的简单处理
         * @param xmlStr xml字符串
         * @return map集合
         */
        public static Map<String, String> xmlToMap(String xmlStr) {
        
            XmlHelper xmlHelper = XmlHelper.of(xmlStr);
            return xmlHelper.toMap();
        }
    
    }

>  *  支付签名常用类

package com.hn.yuan.wxinterface;
    
    import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import org.apache.commons.codec.digest.DigestUtils;
    import org.jdom2.Document;
    import org.jdom2.Element;
    import org.jdom2.input.SAXBuilder;
    
    import java.io.*;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.util.*;
    
    /**
     * 支付签名常用类
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class PayUtil {
        
        /**
         * 签名字符串
         *
         * @param text          需要签名的字符串
         * @param key           密钥
         * @param input_charset 编码格式
         * @return 签名结果
         */
        public static String sign(String text, String key, String input_charset) {
        
            text = text + "&key=" + key;
            return DigestUtils.md5Hex(getContentBytes(text, input_charset));
        }
    
        /**
         * 签名字符串
         *
         * @param text          需要签名的字符串
         * @param sign          签名结果
         * @param key           密钥
         * @param input_charset 编码格式
         * @return 签名结果
         */
        public static boolean verify(String text, String sign, String key, String input_charset) {
        
            text = text +"&key=" + key;
            String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset)).toUpperCase();
            if (mysign.equals(sign)) {
        
                return true;
            } else {
        
                return false;
            }
        }
    
        /**
         * @param content
         * @param charset
         * @return
         * @throws java.security.SignatureException
         * @throws UnsupportedEncodingException
         */
        public static byte[] getContentBytes(String content, String charset) {
        
            if (charset == null || "".equals(charset)) {
        
                return content.getBytes();
            }
            try {
        
                return content.getBytes(charset);
            } catch (UnsupportedEncodingException e) {
        
                throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
            }
        }
    
        private static boolean isValidChar(char ch) {
        
            if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
                return true;
            if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f))
                return true;// 简体中文汉字编码
            return false;
        }
    
        /**
         * 除去数组中的空值和签名参数
         *
         * @param sArray 签名参数组
         * @return 去掉空值与签名参数后的新签名参数组
         */
        public static Map<String, String> paraFilter(Map<String, String> sArray) {
        
            Map<String, String> result = new HashMap<String, String>();
            if (sArray == null || sArray.size() <= 0) {
        
                return result;
            }
            for (String key : sArray.keySet()) {
        
                String value = sArray.get(key);
                if (value == null || value.equals("") || key.equalsIgnoreCase("sign")
                        || key.equalsIgnoreCase("sign_type")) {
        
                    continue;
                }
                result.put(key, value);
            }
            return result;
        }
    
        /**
         * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串
         *
         * @param params 需要排序并参与字符拼接的参数组
         * @return 拼接后字符串
         */
        public static String createLinkString(Map<String, String> params) {
        
            List<String> keys = new ArrayList<>(params.keySet());
            Collections.sort(keys);
            String prestr = "";
            for (int i = 0; i < keys.size(); i++) {
        
                String key = keys.get(i);
                String value = params.get(key);
                if (i == keys.size() - 1) {
        // 拼接时，不包括最后一个&字符
                    prestr = prestr + key + "=" + value;
                } else {
        
                    prestr = prestr + key + "=" + value + "&";
                }
            }
            return prestr;
        }
    
        /**
         * @param requestUrl    请求地址
         * @param requestMethod 请求方法
         * @param outputStr     参数
         */
        public static String httpRequest(String requestUrl, String requestMethod, String outputStr) {
        
            // 创建SSLContext
            StringBuffer buffer = null;
            try {
        
                URL url = new URL(requestUrl);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod(requestMethod);
                conn.setDoOutput(true);
                conn.setDoInput(true);
                conn.connect();
                //往服务器端写内容
                if (null != outputStr) {
        
                    OutputStream os = conn.getOutputStream();
                    os.write(outputStr.getBytes("utf-8"));
                    os.close();
                }
                // 读取服务器端返回的内容
                InputStream is = conn.getInputStream();
                InputStreamReader isr = new InputStreamReader(is, "utf-8");
                BufferedReader br = new BufferedReader(isr);
                buffer = new StringBuffer();
                String line = null;
                while ((line = br.readLine()) != null) {
        
                    buffer.append(line);
                }
                br.close();
            } catch (Exception e) {
        
                e.printStackTrace();
            }
            return buffer.toString();
        }
    
        public static String urlEncodeUTF8(String source) {
        
            String result = source;
            try {
        
                result = java.net.URLEncoder.encode(source, "UTF-8");
            } catch (UnsupportedEncodingException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return result;
        }
    
        /**
         * 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
         *
         * @param strxml
         * @return
         * @throws org.jdom2.JDOMException
         * @throws IOException
         */
        public static Map doXMLParse(String strxml) throws Exception {
        
            if (null == strxml || "".equals(strxml)) {
        
                return null;
            }
    
            Map m = new HashMap();
            InputStream in = String2Inputstream(strxml);
            SAXBuilder builder = new SAXBuilder();
            Document doc = builder.build(in);
            Element root = doc.getRootElement();
            List list = root.getChildren();
            Iterator it = list.iterator();
            while (it.hasNext()) {
        
                Element e = (Element) it.next();
                String k = e.getName();
                String v = "";
                List children = e.getChildren();
                if (children.isEmpty()) {
        
                    v = e.getTextNormalize();
                } else {
        
                    v = getChildrenText(children);
                }
    
                m.put(k, v);
            }
    
            //关闭流
            in.close();
    
            return m;
        }
    
        /**
         * 获取子结点的xml
         *
         * @param children
         * @return String
         */
        public static String getChildrenText(List children) {
        
            StringBuffer sb = new StringBuffer();
            if (!children.isEmpty()) {
        
                Iterator it = children.iterator();
                while (it.hasNext()) {
        
                    Element e = (Element) it.next();
                    String name = e.getName();
                    String value = e.getTextNormalize();
                    List list = e.getChildren();
                    sb.append("<" + name + ">");
                    if (!list.isEmpty()) {
        
                        sb.append(getChildrenText(list));
                    }
                    sb.append(value);
                    sb.append("</" + name + ">");
                }
            }
    
            return sb.toString();
        }
    
        public static InputStream String2Inputstream(String str) {
        
            return new ByteArrayInputStream(str.getBytes());
        }
    
        /**
         * java对象转字符串
         * @param <T> 泛型占位符
         * @param obj T
         * @return String
         */
        public static <T> String toJson(T obj) {
        
            Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").enableComplexMapKeySerialization().create();
            return gson.toJson(obj);
        }
    }

>  *  支付常量

package com.hn.yuan.wxinterface;
    
    
    /**
     * 支付常量
     *
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class WXPayConstants {
        
    
        public enum SignType {
        
            MD5, HMACSHA256
        }
    
        public static final String DOMAIN_API = "api.mch.weixin.qq.com";
        public static final String DOMAIN_API2 = "api2.mch.weixin.qq.com";
        public static final String DOMAIN_APIHK = "apihk.mch.weixin.qq.com";
        public static final String DOMAIN_APIUS = "apius.mch.weixin.qq.com";
    
    
        public static final String FAIL = "FAIL";
        /**
         * 成功的标识
         */
        public static final String SUCCESS = "SUCCESS";
        /**
         * 返回状态码的变量名
         */
        public static final String RETURN_CODE = "return_code";
        public static final String HMACSHA256 = "HMAC-SHA256";
        public static final String MD5 = "MD5";
    
        public static final String FIELD_SIGN = "sign";
        public static final String FIELD_SIGN_TYPE = "sign_type";
    
        public static final String MICROPAY_URL_SUFFIX = "/pay/micropay";
        public static final String UNIFIEDORDER_URL_SUFFIX = "/pay/unifiedorder";
        public static final String ORDERQUERY_URL_SUFFIX = "/pay/orderquery";
        public static final String REVERSE_URL_SUFFIX = "/secapi/pay/reverse";
        public static final String CLOSEORDER_URL_SUFFIX = "/pay/closeorder";
        public static final String REFUNDQUERY_URL_SUFFIX = "/pay/refundquery";
        public static final String DOWNLOADBILL_URL_SUFFIX = "/pay/downloadbill";
    
        // sandbox
        public static final String SANDBOX_MICROPAY_URL_SUFFIX = "/sandboxnew/pay/micropay";
        public static final String SANDBOX_UNIFIEDORDER_URL_SUFFIX = "/sandboxnew/pay/unifiedorder";
        public static final String SANDBOX_ORDERQUERY_URL_SUFFIX = "/sandboxnew/pay/orderquery";
        public static final String SANDBOX_REVERSE_URL_SUFFIX = "/sandboxnew/secapi/pay/reverse";
        public static final String SANDBOX_CLOSEORDER_URL_SUFFIX = "/sandboxnew/pay/closeorder";
        public static final String SANDBOX_REFUND_URL_SUFFIX = "/sandboxnew/secapi/pay/refund";
        public static final String SANDBOX_REFUNDQUERY_URL_SUFFIX = "/sandboxnew/pay/refundquery";
        public static final String SANDBOX_DOWNLOADBILL_URL_SUFFIX = "/sandboxnew/pay/downloadbill";
        public static final String SANDBOX_REPORT_URL_SUFFIX = "/sandboxnew/payitil/report";
        public static final String SANDBOX_SHORTURL_URL_SUFFIX = "/sandboxnew/tools/shorturl";
        public static final String SANDBOX_AUTHCODETOOPENID_URL_SUFFIX = "/sandboxnew/tools/authcodetoopenid";
    }

>  *  xpath解析xml

package com.hn.yuan.wxinterface;
    
    import org.apache.commons.io.IOUtils;
    import org.w3c.dom.Document;
    import org.w3c.dom.Element;
    import org.w3c.dom.Node;
    import org.w3c.dom.NodeList;
    import org.xml.sax.InputSource;
    import org.xml.sax.SAXException;
    
    import javax.xml.namespace.QName;
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    import javax.xml.parsers.ParserConfigurationException;
    import javax.xml.xpath.XPath;
    import javax.xml.xpath.XPathConstants;
    import javax.xml.xpath.XPathExpressionException;
    import javax.xml.xpath.XPathFactory;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.StringReader;
    import java.util.HashMap;
    import java.util.Map;
    
    
    /**
     * xpath解析xml
     * <pre>
     *     文档地址：
     *     http://www.w3school.com.cn/xpath/index.asp
     * </pre>
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class XmlHelper {
        
        private final XPath path;
        private final Document doc;
    
        private XmlHelper(InputSource inputSource) throws ParserConfigurationException, SAXException, IOException {
        
            DocumentBuilderFactory dbf = getDocumentBuilderFactory();
            DocumentBuilder db = dbf.newDocumentBuilder();
            doc = db.parse(inputSource);
            path = getXPathFactory().newXPath();
        }
    
        private static XmlHelper create(InputSource inputSource) {
        
            try {
        
                return new XmlHelper(inputSource);
            } catch (ParserConfigurationException e) {
        
                throw new RuntimeException(e);
            } catch (SAXException e) {
        
                throw new RuntimeException(e);
            } catch (IOException e) {
        
                throw new RuntimeException(e);
            }
        }
    
        public static XmlHelper of(InputStream is) {
        
            InputSource inputSource = new InputSource(is);
            return create(inputSource);
        }
    
        public static XmlHelper of(String xmlStr) {
        
            StringReader sr = new StringReader(xmlStr.trim());
            InputSource inputSource = new InputSource(sr);
            XmlHelper xmlHelper = create(inputSource);
            IOUtils.closeQuietly(sr);
            return xmlHelper;
        }
    
        private Object evalXPath(String expression, Object item, QName returnType) {
        
            item = null == item ? doc : item;
            try {
        
                return path.evaluate(expression, item, returnType);
            } catch (XPathExpressionException e) {
        
                throw new RuntimeException(e);
            }
        }
    
        /**
         * 获取String
         * @param expression 路径
         * @return String
         */
        public String getString(String expression) {
        
            return (String) evalXPath(expression, null, XPathConstants.STRING);
        }
    
        /**
         * 获取Boolean
         * @param expression 路径
         * @return String
         */
        public Boolean getBoolean(String expression) {
        
            return (Boolean) evalXPath(expression, null, XPathConstants.BOOLEAN);
        }
    
        /**
         * 获取Number
         * @param expression 路径
         * @return {Number}
         */
        public Number getNumber(String expression) {
        
            return (Number) evalXPath(expression, null, XPathConstants.NUMBER);
        }
    
        /**
         * 获取某个节点
         * @param expression 路径
         * @return {Node}
         */
        public Node getNode(String expression) {
        
            return (Node) evalXPath(expression, null, XPathConstants.NODE);
        }
    
        /**
         * 获取子节点
         * @param expression 路径
         * @return NodeList
         */
        public NodeList getNodeList(String expression) {
        
            return (NodeList) evalXPath(expression, null, XPathConstants.NODESET);
        }
    
    
        /**
         * 获取String
         * @param node 节点
         * @param expression 相对于node的路径
         * @return String
         */
        public String getString(Object node, String expression) {
        
            return (String) evalXPath(expression, node, XPathConstants.STRING);
        }
    
        /**
         * 获取
         * @param node 节点
         * @param expression 相对于node的路径
         * @return String
         */
        public Boolean getBoolean(Object node, String expression) {
        
            return (Boolean) evalXPath(expression, node, XPathConstants.BOOLEAN);
        }
    
        /**
         * 获取
         * @param node 节点
         * @param expression 相对于node的路径
         * @return {Number}
         */
        public Number getNumber(Object node, String expression) {
        
            return (Number) evalXPath(expression, node, XPathConstants.NUMBER);
        }
    
        /**
         * 获取某个节点
         * @param node 节点
         * @param expression 路径
         * @return {Node}
         */
        public Node getNode(Object node, String expression) {
        
            return (Node) evalXPath(expression, node, XPathConstants.NODE);
        }
    
        /**
         * 获取子节点
         * @param node 节点
         * @param expression 相对于node的路径
         * @return NodeList
         */
        public NodeList getNodeList(Object node, String expression) {
        
            return (NodeList) evalXPath(expression, node, XPathConstants.NODESET);
        }
    
        /**
         * 针对没有嵌套节点的简单处理
         * @return map集合
         */
        public Map<String, String> toMap() {
        
            Element root = doc.getDocumentElement();
            Map<String, String> params = new HashMap<String, String>();
    
            // 将节点封装成map形式
            NodeList list = root.getChildNodes();
            for (int i = 0; i < list.getLength(); i++) {
        
                Node node = list.item(i);
                if (node instanceof Element) {
        
                    params.put(node.getNodeName(), node.getTextContent());
                }
            }
            return params;
        }
    
        private static DocumentBuilderFactory getDocumentBuilderFactory(){
        
            return XmlHelperHolder.documentBuilderFactory;
        }
    
        private static XPathFactory getXPathFactory() {
        
            return  XmlHelperHolder.xPathFactory;
        }
    
        /**
         * 内部类单例
         */
        private static class XmlHelperHolder {
        
            private static DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            private static XPathFactory xPathFactory = XPathFactory.newInstance();
        }
    
    }

>  *  常用工具类

package com.hn.yuan.wxinterface;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.w3c.dom.Node;
    import org.w3c.dom.NodeList;
    
    import javax.crypto.Mac;
    import javax.crypto.spec.SecretKeySpec;
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    import javax.xml.transform.OutputKeys;
    import javax.xml.transform.Transformer;
    import javax.xml.transform.TransformerFactory;
    import javax.xml.transform.dom.DOMSource;
    import javax.xml.transform.stream.StreamResult;
    import java.io.ByteArrayInputStream;
    import java.io.InputStream;
    import java.io.StringWriter;
    import java.security.MessageDigest;
    import java.util.*;
    
    
    /**
     * 常用工具类
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class WXPayUtil {
        
    
        /**
         * XML格式字符串转换为Map
         *
         * @param strXML XML字符串
         * @return XML数据转换后的Map
         * @throws Exception
         */
        public static Map<String, String> xmlToMap(String strXML) throws Exception {
        
            try {
        
                Map<String, String> data = new HashMap<String, String>();
                DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
                InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
                org.w3c.dom.Document doc = documentBuilder.parse(stream);
                doc.getDocumentElement().normalize();
                NodeList nodeList = doc.getDocumentElement().getChildNodes();
                for (int idx = 0; idx < nodeList.getLength(); ++idx) {
        
                    Node node = nodeList.item(idx);
                    if (node.getNodeType() == Node.ELEMENT_NODE) {
        
                        org.w3c.dom.Element element = (org.w3c.dom.Element) node;
                        data.put(element.getNodeName(), element.getTextContent());
                    }
                }
                try {
        
                    stream.close();
                } catch (Exception ex) {
        
                    // do nothing
                }
                return data;
            } catch (Exception ex) {
        
                WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
                throw ex;
            }
    
        }
    
        /**
         * 将Map转换为XML格式的字符串
         *
         * @param data Map类型数据
         * @return XML格式的字符串
         * @throws Exception
         */
        public static String mapToXml(Map<String, String> data) throws Exception {
        
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
            org.w3c.dom.Document document = documentBuilder.newDocument();
            org.w3c.dom.Element root = document.createElement("xml");
            document.appendChild(root);
            for (String key: data.keySet()) {
        
                String value = data.get(key);
                if (value == null) {
        
                    value = "";
                }
                value = value.trim();
                org.w3c.dom.Element filed = document.createElement(key);
                filed.appendChild(document.createTextNode(value));
                root.appendChild(filed);
            }
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer transformer = tf.newTransformer();
            DOMSource source = new DOMSource(document);
            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            StringWriter writer = new StringWriter();
            StreamResult result = new StreamResult(writer);
            transformer.transform(source, result);
            String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
            try {
        
                writer.close();
            }
            catch (Exception ex) {
        
            }
            return output;
        }
    
    
        /**
         * 生成带有 sign 的 XML 格式字符串
         *
         * @param data Map类型数据
         * @param key API密钥
         * @return 含有sign字段的XML
         */
        public static String generateSignedXml(final Map<String, String> data, String key) throws Exception {
        
            return generateSignedXml(data, key, WXPayConstants.SignType.MD5);
        }
    
        /**
         * 生成带有 sign 的 XML 格式字符串
         *
         * @param data Map类型数据
         * @param key API密钥
         * @param signType 签名类型
         * @return 含有sign字段的XML
         */
        public static String generateSignedXml(final Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
        
            String sign = generateSignature(data, key, signType);
            data.put(WXPayConstants.FIELD_SIGN, sign);
            return mapToXml(data);
        }
    
    
        /**
         * 判断签名是否正确
         *
         * @param xmlStr XML格式数据
         * @param key API密钥
         * @return 签名是否正确
         * @throws Exception
         */
        public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
        
            Map<String, String> data = xmlToMap(xmlStr);
            if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
        
                return false;
            }
            String sign = data.get(WXPayConstants.FIELD_SIGN);
            return generateSignature(data, key).equals(sign);
        }
    
        /**
         * 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。
         *
         * @param data Map类型数据
         * @param key API密钥
         * @return 签名是否正确
         * @throws Exception
         */
        public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception {
        
            return isSignatureValid(data, key, WXPayConstants.SignType.MD5);
        }
    
        /**
         * 判断签名是否正确，必须包含sign字段，否则返回false。
         *
         * @param data Map类型数据
         * @param key API密钥
         * @param signType 签名方式
         * @return 签名是否正确
         * @throws Exception
         */
        public static boolean isSignatureValid(Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
        
            if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
        
                return false;
            }
            String sign = data.get(WXPayConstants.FIELD_SIGN);
            return generateSignature(data, key, signType).equals(sign);
        }
    
        /**
         * 生成签名
         *
         * @param data 待签名数据
         * @param key API密钥
         * @return 签名
         */
        public static String generateSignature(final Map<String, String> data, String key) throws Exception {
        
            return generateSignature(data, key, WXPayConstants.SignType.MD5);
        }
    
        /**
         * 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
         *
         * @param data 待签名数据
         * @param key API密钥
         * @param signType 签名方式
         * @return 签名
         */
        public static String generateSignature(final Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
        
            Set<String> keySet = data.keySet();
            String[] keyArray = keySet.toArray(new String[keySet.size()]);
            Arrays.sort(keyArray);
            StringBuilder sb = new StringBuilder();
            for (String k : keyArray) {
        
                if (k.equals(WXPayConstants.FIELD_SIGN)) {
        
                    continue;
                }
                if(data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
                    sb.append(k).append("=").append(data.get(k).trim()).append("&");
            }
            sb.append("key=").append(key);
            if (WXPayConstants.SignType.MD5.equals(signType)) {
        
                return MD5(sb.toString()).toUpperCase();
            }
            else if (WXPayConstants.SignType.HMACSHA256.equals(signType)) {
        
                return HMACSHA256(sb.toString(), key);
            }
            else {
        
                throw new Exception(String.format("Invalid sign_type: %s", signType));
            }
        }
    
    
        /**
         * 获取随机字符串 Nonce Str
         *
         * @return String 随机字符串
         */
        public static String generateNonceStr() {
        
            return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
        }
    
    
        /**
         * 生成 MD5
         *
         * @param data 待处理数据
         * @return MD5结果
         */
        public static String MD5(String data) throws Exception {
        
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] array = md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
        
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString().toUpperCase();
        }
    
        /**
         * 生成 HMACSHA256
         * @param data 待处理数据
         * @param key 密钥
         * @return 加密结果
         * @throws Exception
         */
        public static String HMACSHA256(String data, String key) throws Exception {
        
            Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
            SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
            sha256_HMAC.init(secret_key);
            byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
        
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString().toUpperCase();
        }
    
        /**
         * 日志
         * @return
         */
        public static Logger getLogger() {
        
            Logger logger = LoggerFactory.getLogger("wxpay java sdk");
            return logger;
        }
    
        /**
         * 获取当前时间戳，单位秒
         * @return
         */
        public static long getCurrentTimestamp() {
        
            return System.currentTimeMillis()/1000;
        }
    
        /**
         * 获取当前时间戳，单位毫秒
         * @return
         */
        public static long getCurrentTimestampMs() {
        
            return System.currentTimeMillis();
        }
    
        /**
         * 生成 uuid， 即用来标识一笔单，也用做 nonce_str
         * @return
         */
        public static String generateUUID() {
        
            return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
        }
    
    }

>  *  Tools工具类

package com.hn.yuan.wxinterface;
    
    import java.security.MessageDigest;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.*;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    
    /**
     * 常用工具
     * @author XIAOCAO
     * @version 2020/12/24
     **/
    public class Tools {
        
    
        /**
         * 随机生成六位数验证码
         * @return
         */
        public static int getRandomNum(){
        
            Random r = new Random();
            return r.nextInt(900000)+100000;//(Math.random()*(999999-100000)+100000)
        }
    
        /**
         * 检测字符串是否不为空(null,"","null")
         * @param s
         * @return 不为空则返回true，否则返回false
         */
        public static boolean notEmpty(String s){
        
            return s!=null && !"".equals(s) && !"null".equals(s);
        }
    
        /**
         * 检测字符串是否为空(null,"","null")
         * @param s
         * @return 为空则返回true，不否则返回false
         */
        public static boolean isEmpty(String s){
        
            return s==null || "".equals(s) || "null".equals(s);
        }
    
        /**
         * 字符串转换为字符串数组
         * @param str 字符串
         * @param splitRegex 分隔符
         * @return
         */
        public static String[] str2StrArray(String str,String splitRegex){
        
            if(isEmpty(str)){
        
                return null;
            }
            return str.split(splitRegex);
        }
    
        /**
         * 用默认的分隔符(,)将字符串转换为字符串数组
         * @param str	字符串
         * @return
         */
        public static String[] str2StrArray(String str){
        
            return str2StrArray(str,",\\s*");
        }
    
        /**
         * 按照yyyy-MM-dd HH:mm:ss的格式，日期转字符串
         * @param date
         * @return yyyy-MM-dd HH:mm:ss
         */
        public static String date2Str(Date date){
        
            return date2Str(date,"yyyy-MM-dd HH:mm:ss");
        }
    
        /**
         * 按照yyyy-MM-dd HH:mm:ss的格式，字符串转日期
         * @param date
         * @return
         */
        public static Date str2Date(String date){
        
            if(notEmpty(date)){
        
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                try {
        
                    return sdf.parse(date);
                } catch (ParseException e) {
        
                    e.printStackTrace();
                }
                return new Date();
            }else{
        
                return null;
            }
        }
    
        /**
         * 按照参数format的格式，日期转字符串
         * @param date
         * @param format
         * @return
         */
        public static String date2Str(Date date,String format){
        
            if(date!=null){
        
                SimpleDateFormat sdf = new SimpleDateFormat(format);
                return sdf.format(date);
            }else{
        
                return "";
            }
        }
    
        /**
         * 把时间根据时、分、秒转换为时间段
         * @param StrDate
         */
        public static String getTimes(String StrDate){
        
            String resultTimes = "";
    
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date now;
    
            try {
        
                now = new Date();
                Date date=df.parse(StrDate);
                long times = now.getTime()-date.getTime();
                long day  =  times/(24*60*60*1000);
                long hour = (times/(60*60*1000)-day*24);
                long min  = ((times/(60*1000))-day*24*60-hour*60);
                long sec  = (times/1000-day*24*60*60-hour*60*60-min*60);
    
                StringBuffer sb = new StringBuffer();
                //sb.append("发表于：");
                if(hour>0 ){
        
                    sb.append(hour+"小时前");
                } else if(min>0){
        
                    sb.append(min+"分钟前");
                } else{
        
                    sb.append(sec+"秒前");
                }
    
                resultTimes = sb.toString();
            } catch (ParseException e) {
        
                e.printStackTrace();
            }
    
            return resultTimes;
        }
    
        /**
         * 验证邮箱
         * @param email
         * @return
         */
        public static boolean checkEmail(String email){
        
            boolean flag = false;
            try{
        
                String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
                Pattern regex = Pattern.compile(check);
                Matcher matcher = regex.matcher(email);
                flag = matcher.matches();
            }catch(Exception e){
        
                flag = false;
            }
            return flag;
        }
    
        /**
         * 验证手机号码
         * @return
         */
        public static boolean checkMobileNumber(String mobileNumber){
        
            Pattern p = null;
            Matcher m = null;
            boolean b = false;
            p = Pattern.compile("^[1][3,4,5,7,8][0-9]{9}$"); // 验证手机号
            m = p.matcher(mobileNumber);
            b = m.matches();
            return b;
        }
    
        /**
         * 将驼峰转下划线
         * @param param
         * @return
         */
        public static String camelToUnderline(String param){
        
            if (param==null||"".equals(param.trim())){
        
                return "";
            }
            int len=param.length();
            StringBuilder sb=new StringBuilder(len);
            for (int i = 0; i < len; i++) {
        
                char c=param.charAt(i);
                if (Character.isUpperCase(c)){
        
                    sb.append("_");
                    sb.append(Character.toLowerCase(c));
                }else{
        
                    sb.append(c);
                }
            }
            return sb.toString();
        }
    
        /**
         * 去掉下划线并将下划线后的首字母转为大写
         * @param str
         * @return
         */
        public static String transformStr(String str){
        
            //去掉数据库字段的下划线
            if(str.contains("_")) {
        
                String[] names = str.split("_");
                String firstPart = names[0];
                String otherPart = "";
                for (int i = 1; i < names.length; i++) {
        
                    String word = names[i].replaceFirst(names[i].substring(0, 1), names[i].substring(0, 1).toUpperCase());
                    otherPart += word;
                }
                str = firstPart + otherPart;
            }
            return str;
        }
    
        /**
         * 转换为map
         * @param list
         * @return
         */
        public static List<Map<String,Object>> transformMap(List<Map<String,Object>> list){
        
            List<Map<String,Object>> resultMapList = new ArrayList<>();
    
            for (Map<String, Object> map : list) {
        
                Map<String,Object> tempMap = new HashMap<>();
                for (String s : map.keySet()) {
        
                    tempMap.put(transformStr(s),map.get(s));
                }
                resultMapList.add(tempMap);
            }
            return resultMapList;
        }
    
        public static String clearHtml(String content,int p) {
        
            if(null==content) return "";
            if(0==p) return "";
    
            Pattern p_script;
            Matcher m_script;
            Pattern p_style;
            Matcher m_style;
            Pattern p_html;
            Matcher m_html;
    
            try {
        
                String regEx_script = "<[\\s]*?script[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?script[\\s]*?>";
                //定义script的正则表达式{或<script[^>]*?>[\\s\\S]*?<\\/script> }
                String regEx_style = "<[\\s]*?style[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?style[\\s]*?>";
                //定义style的正则表达式{或<style[^>]*?>[\\s\\S]*?<\\/style> }
                String regEx_html = "<[^>]+>"; //定义HTML标签的正则表达式
    
                p_script = Pattern.compile(regEx_script,Pattern.CASE_INSENSITIVE);
                m_script = p_script.matcher(content);
                content = m_script.replaceAll(""); //过滤script标签
                p_style = Pattern.compile(regEx_style,Pattern.CASE_INSENSITIVE);
                m_style = p_style.matcher(content);
                content = m_style.replaceAll(""); //过滤style标签
    
                p_html = Pattern.compile(regEx_html,Pattern.CASE_INSENSITIVE);
                m_html = p_html.matcher(content);
    
                content = m_html.replaceAll(""); //过滤html标签
            }catch(Exception e) {
        
                return "";
            }
    
            if(content.length()>p){
        
                content = content.substring(0, p)+"...";
            }else{
        
                content = content + "...";
            }
    
            return content;
        }
    
        public static String md5(String str) {
        
            try {
        
                MessageDigest md = MessageDigest.getInstance("MD5");
                md.update(str.getBytes());
                byte b[] = md.digest();
    
                int i;
    
                StringBuffer buf = new StringBuffer("");
                for (int offset = 0; offset < b.length; offset++) {
        
                    i = b[offset];
                    if (i < 0)
                        i += 256;
                    if (i < 16)
                        buf.append("0");
                    buf.append(Integer.toHexString(i));
                }
                str = buf.toString();
            } catch (Exception e) {
        
                e.printStackTrace();
    
            }
            return str;
        }
    
    
    }

### 微信小程序支付功能完整流程-总结(可忽略) ###

![6a4f3cea92874e1561f4eea436ace1ea.jpeg][]

#### 获取令牌token ####

*  获取令牌token

// 点击支付
    async handleOrderPay() {
        
      // 从缓存中获取token
      const token = wx.getStorageSync('token')
      // 如果token不存在，跳转到授权页面获取token
      if (!token) {
        
        wx.navigateTo({
        
          url: '/pages/auth/auth',
        })
     }
    
    <button type="primary" plain open-type="getUserInfo" bindgetuserinfo="handleGetUserInfo">授权</button>

*  缓存中不存在token，**授权！**

// 授权操作
    // pages/auth/auth.js
    import {
        request} from '../../request/index.js' //网络请求
    import regeneratorRuntime from '../../lib/runtime/runtime' //使用es7语法
    import {
        login} from '../../utils/asyncWx.js' //内部封装了wx.login()，通过该方法获取一个必须参数code
    
    Page({
        
      // 获取用户信息
      async handleGetUserInfo(e) {
        
        try {
        
          // 获取小程序登录成功后的五个必须参数
          const {
        
            encryptedData,
            rawData,
            iv,
            signature
          } = e.detail
          const {
        
            code
          } = await login()
          // 将这五个参数存入loginParams自定义对象中
          const loginParams = {
        
            encryptedData,
            rawData,
            iv,
            signature,
            code
          }
          // 获取token
          const {
        
            token
          } = await request({
        
            url: '/users/wxlogin',
            // 传入这五个必须参数
            data: loginParams,
            method: 'POST'
          })
          // 将token存入缓存中，同时跳转到上一个页面
          wx.setStorageSync('token', token)
          wx.navigateBack({
        
            // delta表示返回的层级，1表示返回上一层，2表示返回上两层
            delta: 1,
          })
        } catch (error) {
        
          console.log(error)
        }
      }
    })

#### 创建订单 ####

*  获取到5个必须参数

// 创建订单
        // 请求头参数，这个参数会贯穿整个支付过程中的网络请求
        const header = {
        
          // 授权参数即为token
          Authorization: token
        }
        // 请求体参数
        const order_price = this.data.totalPrice //总价格
        const consignee_addr = this.data.address.all //详细收获地址
        const cart = this.data.cart 
        let goods = [] //订单数组，从购物车中提取出几个所需要的属性组成的数组
        goods = cart.forEach(v => {
        
          goods_id: v.goods_id
          goods_number: v.num
          goods_price: v.goods_price
        })
    	// 将所需要的订单参数存入orderParams
        const orderParams = {
        
          order_price,
          consignee_addr,
          goods
        }

*  获取订单编号

// 获取订单编号
        const {
        order_number} = await request({
        
          url: '/my/orders/create',
          method: 'POST',
          // 将之前获得的订单参数传入
          data: orderParams,
          header
        })
        console.log(order_number)
      }

#### 预支付 ####

*  根据订单编号获取到支付参数对象pay

const {
        pay} = await request({
        
          url: '/my/orders/req_unifiedorder',
          method: "POST",
          header,
          // 传入订单编号
          data: {
        
            order_number
          }
        })
        console.log('pay')

#### 发起微信支付 ####

*  将支付参数pay传入到requestPayment中即可

await requestPayment(pay)

#### 收尾工作 ####

*  跳转到订单页面，同时删除购物车中以购买的商品

await showToast('支付成功')
          // 删除缓存中已经被选中的商品
          let newCart = wx.getStorageSync('cart')
          newCart = newCart.filter(v => !v.checked)
          wx.setStorageSync('cart', newCart)
          // 此时跳转到订单页面
          wx.navigateTo({
        
            url: '/pages/order/order',
          })

后续V3版本-待编辑  
![在这里插入图片描述][a0ecec599db64baab903f6f9764baf43.jpeg_pic_center]

> 各位看官》创作不易，点个赞！！！  
> 诸君共勉：万事开头难，只愿肯放弃。

免责声明：本文章仅用于学习参考

[V2_V3]: https://blog.csdn.net/SoulNone/article/details/127324349
[Link 1]: https://mp.weixin.qq.com/
[Link 2]: https://pay.weixin.qq.com/index.php/core/home/login
[Link 3]: https://developers.weixin.qq.com/miniprogram/dev/framework/quickstart/getstart.html#%E7%94%B3%E8%AF%B7%E5%B8%90%E5%8F%B7
[Link 4]: https://open.weixin.qq.com/
[897728ebdecc4eaca407068fe258fd5d.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/03/9dd17c27ddf14fcba8dfd57810c6555a.png
[Link 5]: https://blog.csdn.net/SoulNone/article/details/127324143
[Link 6]: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter2_8_1.shtml
[c0ee4680be2a40a49c6cd8a45ff90050.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/03/de98dc19d33e4c069ab82f6e40fb7518.png
[69eb1b4801a64666b618cf7facf5009d.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/03/c52746a36a8b4db19336e1273c51d909.png
[6a4f3cea92874e1561f4eea436ace1ea.jpeg]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/03/ae2c51c973054999819513ac2e27d1ef.jpeg
[a0ecec599db64baab903f6f9764baf43.jpeg_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/03/a9a6832d90224d3795ea14e69eafe6eb.jpeg