java后台提供ios微信支付接口

不念不忘少年蓝@ 2022-06-04 05:37 261阅读 0赞

提供微信支付接口，需要先在微信开放平台（[https://open.weixin.qq.com/][https_open.weixin.qq.com]）申请账号，进行开发者资格认证通过后创建应用。  
![这里写图片描述][SouthEast]  
创建成功后会有对应应用的AppID和AppSecret这个ios需要。我们需要的是商户平台的账号、初始密码、对应应用的AppID等，在开发者资格认证成功后微信会发到绑定的邮箱上。收到邮箱后需要登录到微信商户平台（[https://pay.weixin.qq.com/index.php/core/home/login?return\_url=%2F][https_pay.weixin.qq.com_index.php_core_home_login_return_url_2F]）修改初始密码并进行设置api密钥。  
![这里写图片描述][SouthEast 1]  
关于登录微信商户平台，我在进行登录时候火狐和谷歌经常不行，证书安装不好，后来试用qq浏览器才能登上，但是退款时候下载证书又不行，后来用了uc才可以的。配置好后我们就可以进行编码。首先看一下微信官方的文档上app支付需要的参数。  
ios要在app中调起微信支付，需要一下几个参数：  
![这里写图片描述][SouthEast 2]  
这些参数由后台传送给ios，后台需要先传入以下必填参数进行第一次签名：  
![这里写图片描述][SouthEast 3]  
![这里写图片描述][SouthEast 4]  
**注意：对于同一帐号的不同应用，每次申请均需填写资料，均需签署合同。**  
接下来就是代码部分：微信的配置文件：

#weixin apy
    ##appid
    weixin.appid=
    ##应用id 认证成功后微信官方给你返回
    weixin.mch_id=
    ##回调url
    weixin.notify_url=
    ##退款的回调url
    weixin.refund_notify_url=

提供给ios接口代码：

import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.PrintWriter;
    import java.io.UnsupportedEncodingException;
    import java.lang.reflect.Field;
    import java.math.BigDecimal;
    import java.math.RoundingMode;
    import java.security.Security;
    import java.text.DecimalFormat;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.SortedMap;
    import java.util.TreeMap;
    import java.util.UUID;
    
    import javax.annotation.Resource;
    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.codec.binary.Base64;
    import org.apache.commons.lang3.StringUtils;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.util.EntityUtils;
    import org.apache.struts2.convention.annotation.Action;
    import org.apache.struts2.convention.annotation.Namespace;
    import org.apache.struts2.convention.annotation.Result;
    import org.apache.struts2.convention.annotation.Results;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    
    import com.alibaba.fastjson.JSONObject;
    import com.alibaba.fastjson.serializer.SerializerFeature;
    
    /** * 微信支付的接口 * */
    @Namespace("/out/weixinPay")
    @Results({ @Result(name = "500", location = "/WEB-INF/views/500.jsp") })
    @SuppressWarnings("unused")
    public class WeixinPayAction extends OutInterfaceBasicAction<Consult> {
        private static final long serialVersionUID = 1L;
        private Map<String, Object> msg = new HashMap<String, Object>();
        /* * @Resource private UnifiedOrderService unifiedOrderService; */
        @Resource
        private MemberService memberService;
        @Resource
        private ALiPayService aLiPayService;
        private ALiPay aLiPay = new ALiPay();
        @Resource
        private IMessageService iMessageService;
        @Resource
        private RefundOrderService refundOrderService;
        private static DecimalFormat df = new DecimalFormat("0.00");
        // 构造签名的map
        private SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
        // 构造向微信发送参数的实体类
        private Unifiedorder unifiedorder = new Unifiedorder();
        // 微信的参数
        private WeixinConfigUtils config = new WeixinConfigUtils();
        public static final String ALGORITHM = "AES/ECB/PKCS7Padding"; 
        private RefundOrder refundOrder = new RefundOrder();
        @Resource
        private AESDecodeUtil aesDecodeUtil;
        @Resource
        private OrderService orderService;
        /** * 微信充值 */
        @Action("weChatPayRecharge")
        public String weChatPayRecharge() {
            try {
        df.setRoundingMode(RoundingMode.HALF_UP);
        // 获取用户ID
        String memberId = etRequest().getParameter("memberId");
        String integer = getRequest().getParameter("integer");
        if (StringUtils.isNotBlank(memberId)
                        && StringUtils.isNotBlank(integer)) {
            Integer score = Integer.valueOf(integer);
            // 产生订单号
            String outTradeNo = UuIdUtils.getUUID();
            // 参数组
            String appid = config.appid;
            String mch_id = config.mch_id;
            String nonce_str = RandCharsUtils.getRandomString(16);
            String body = "";
            body = "购买" + score + "积分,支付" + df.format(score           / 100)+ "元";
             String detail = score / 100 + "元支付开始";
            String attach = "暂时无用（这个用于区分不同版本）";
            String out_trade_no = outTradeNo;
            int total_fee = score;// 单位是分，现在按照ios传递过来的参数进行
            String spbill_create_ip = "127.0.0.1";
            String time_start = RandCharsUtils.timeStart();
            String time_expire = RandCharsUtils.timeExpire();
            String notify_url = config.notify_url;
            String trade_type = "APP";
           // 参数：开始生成第一次签名
            parameters.put("appid", appid);
            parameters.put("mch_id", mch_id);
            parameters.put("body", body);
            parameters.put("nonce_str", nonce_str);
            parameters.put("detail", detail);
            parameters.put("attach", attach);
            parameters.put("out_trade_no", out_trade_no);
            parameters.put("total_fee", total_fee);
            parameters.put("time_start", time_start);
            parameters.put("time_expire", time_expire);
            parameters.put("notify_url", notify_url);
            parameters.put("trade_type", trade_type);
            parameters.put("spbill_create_ip", spbill_create_ip);
            String sign = WXSignUtils.createSign("UTF-8", parameters);
                    // 微信统一下单
            unifiedorder.setAppid(appid);
            unifiedorder.setMch_id(mch_id);
            unifiedorder.setNonce_str(nonce_str);
            unifiedorder.setSign(sign);
            unifiedorder.setBody(body);
            unifiedorder.setDetail(detail);
            unifiedorder.setAttach(attach);
            unifiedorder.setOut_trade_no(out_trade_no);
            unifiedorder.setTotal_fee(total_fee);
                     unifiedorder.setSpbill_create_ip(spbill_create_ip);
            unifiedorder.setTime_start(time_start);
            unifiedorder.setTime_expire(time_expire);
            unifiedorder.setNotify_url(notify_url);
            unifiedorder.setTrade_type(trade_type);
            try {
                        // 微信第二次签名
                        SortedMap<Object, Object> parameter2 = new TreeMap<Object, Object>();
                        parameter2.put("appid", appid);
                        parameter2.put("noncestr", nonce_str);
                        parameter2.put("package", "Sign=WXPay");
                        parameter2.put("partnerid", mch_id);
                        String prepareId = HttpXmlUtils.getPrepareId(unifiedorder);
                        parameter2.put("prepayid", prepareId);
                        long timestamp = System.currentTimeMillis() / 1000;
                        parameter2.put("timestamp", timestamp);
                        String sign2 = WXSignUtils.createSign("UTF-8", parameter2);
                        unifiedorder = null;
                        // 订单信息存入数据库
                        aLiPay.setApp_id(appid);
                        aLiPay.setSubject(body);
                        aLiPay.setScore(integer);
                        aLiPay.setGmt_create(time_start);
                        if (null != memberId && !"".equals(memberId)) {
                            aLiPay.setMember(memberService.getMemberById(Integer
                                    .valueOf(memberId)));
                        }
                        aLiPay.setOut_trade_no(out_trade_no);
                        aLiPay.setPayStatus(PayStatusEnum.WAITPAY.getComment());
                        aLiPay.setPayType(PayTypeEnum.WEIXIN.getComment());
                        aLiPay.setState(0);
                        aLiPay.setTotal_amount(String.valueOf(total_fee / 100));
                        aLiPay.setTrade_no(prepareId);
                        aLiPay.setSign(sign);
                        aLiPay.setTotalFee(total_fee);
                        aLiPayService.addALiPay(aLiPay);
                        // 传递给ios的参数
                        msg.put("prepay_id", prepareId);
                        msg.put("appid", appid);
                        msg.put("mch_id", mch_id);
                        msg.put("timestamp", timestamp);
                        msg.put("nonce_str", nonce_str);
                        msg.put("sign", sign2);
                        msg.put("stateCode", MsgCode.SUCCESS);
                        msg.put("message ", "请求成功并返回数据！");
                    } catch (Exception e) {
                        msg.put("stateCode", MsgCode.ERROR);
                        msg.put("message ", "请求失败");
                    }
                } else {
                    msg.put("stateCode", MsgCode.GET_PARAM_ERROR);
                    msg.put("message ", "获取参数失败！");
                }
                Struts2Utils.renderJson(JSONObject.toJSONString(msg,
                        SerializerFeature.DisableCircularReferenceDetect));
                return NONE;
            } catch (Exception e) {
                log.error(e.getMessage());
                e.printStackTrace();
                return "500";
            }
        }
    
        */
        /** * 微信回调url * * @throws IOException */
        @Action("notifyUrl")
        public String notifyUrl() throws IOException {
            try {
                Map<String, String> resultMap = JdomParseXmlUtils.getWeixinResult(
                        Struts2Utils.getRequest(), Struts2Utils.getResponse());
                aLiPay = aLiPayService.searchALiPayByOutTradeNo(resultMap
                        .get("out_trade_no"));
                String resutlTotal = String.valueOf(Integer.valueOf(resultMap
                        .get("total_fee")) / 100);
                if (aLiPay.getState() == 0) {
                    if (aLiPay.getOut_trade_no().equals(
                            resultMap.get("out_trade_no"))
                            && aLiPay.getTotal_amount().equals(resutlTotal)) {
                        aLiPay.setGmt_payment(resultMap.get("time_end"));
                        aLiPay.setPayStatus(PayStatusEnum.PAYOVER.getComment());
                        aLiPay.setState(1);
                        aLiPayService.updateALiPay(aLiPay);
                        iMessageService.sendUserscoreMsg(new IntegrationContent(
                                aLiPay.getMember().getMemberId(), Integer
                                        .valueOf(aLiPay.getScore()), "微信充值"
                                        + aLiPay.getScore() + "积分", 1));
                        unifiedorder.setReturn_code("SUCCESS");
                    }
                } else {
                    unifiedorder.setReturn_code("FAIL");
                }
                String refundXml = HttpXmlUtils.refundXml(unifiedorder);
                Struts2Utils.getResponse().getWriter().write(refundXml);
                Struts2Utils.getResponse().getWriter().flush();
                return null;
            } catch (Exception e) {
                log.error(e.getMessage());
                e.printStackTrace();
                return "500";
            }
        }
    }

使用到的工具类代码：  
uuidUtis用于生成订单号：

import java.util.UUID;
    
    public class UuIdUtils {
        public static String getUUID() {
            return UUID.randomUUID().toString().replace("-", "");
        }
    }

WeixinConfigUtils加载weixin.properties文件。

import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    import java.util.ResourceBundle;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    
    /** * 微信的配置参数 * @author * @date 2017/08/10 */
    @SuppressWarnings("unused")
    public class WeixinConfigUtils { 
        private static final Log log = LogFactory.getLog(WeixinConfigUtils.class);
        public static String appid;
        public static String mch_id;
        public static String notify_url;
        public static String order_notify_url;
        public static String doctor_notify_url;
        static {
            try{
                InputStream is = WeixinConfigUtils.class.getResourceAsStream("/weixin.properties");
                Properties properties = new Properties();
                properties.load(is);
                appid = properties.getProperty("weixin.appid");
                mch_id = properties.getProperty("weixin.mch_id");
                notify_url = properties.getProperty("weixin.notify_url");
                order_notify_url = properties.getProperty("weixin.order_notify_url");
                doctor_notify_url = properties.getProperty("weixin.doctor_notify_url");
            }catch(Exception ex){
                log.debug("加载配置文件："+ex.getMessage());
            }
        }
    }

import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.Random;
    
    /** * nonce_str随即字符串 * @author * @date 2017/08/10 */
    public class RandCharsUtils { 
        private static SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
    
        public static String getRandomString(int length) { //length表示生成字符串的长度
            String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";   
            Random random = new Random();   
            StringBuffer sb = new StringBuffer();
            int number = 0;
            for (int i = 0; i < length; i++) {   
                number = random.nextInt(base.length());   
                sb.append(base.charAt(number));   
            }   
            return sb.toString();   
        }   
    
        /* * 订单开始交易的时间 */
        public static String timeStart(){
            return df.format(new Date());
        }
    
        /* * 订单开始交易的时间 */
        public static String timeExpire(){
            Calendar now=Calendar.getInstance();
            now.add(Calendar.MINUTE,30);
            return df.format(now.getTimeInMillis());
        }
    
    }

import java.util.Iterator;
    import java.util.Map;
    import java.util.Set;
    import java.util.SortedMap;
    
    /** * 微信支付签名 * @author yangfuren * @date 2017/08/10 */
    public class WXSignUtils { 
        /** * 微信支付签名算法sign * @param characterEncoding * @param parameters * @return */
        @SuppressWarnings("rawtypes")
        public static String createSign(String characterEncoding,SortedMap<Object,Object> parameters){
            StringBuffer sb = new StringBuffer();
            Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）
            Iterator it = es.iterator();
            while(it.hasNext()) {
                Map.Entry entry = (Map.Entry)it.next();
                String k = (String)entry.getKey();
                Object v = entry.getValue();
                if(null != v && !"".equals(v) 
                        && !"sign".equals(k) && !"key".equals(k)) {
                    sb.append(k + "=" + v + "&");
                }
            }
            sb.append("key=" + weixinConstant.KEY);
            String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
            return sign;
        }
    }

import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.io.StringReader;
    import java.net.HttpURLConnection;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.annotation.Resource;
    import javax.net.ssl.HttpsURLConnection;
    
    import org.jdom.JDOMException;
    import org.jdom.input.SAXBuilder;
    import org.xml.sax.InputSource;
    
    import com.thoughtworks.xstream.XStream;
    import com.thoughtworks.xstream.io.xml.DomDriver;
    import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
    /** * post提交xml格式的参数 * @author * @date 2017/08/10 */
    public class HttpXmlUtils { 
        @Resource
        private RefundOrderService refundOrderService;
        public static XStream xStream = new XStream(new DomDriver("UTF-8",
                new XmlFriendlyNameCoder("-_", "_")));
        /** * 开始post提交参数到接口 * 并接受返回 * @param url * @param xml * @param method * @param contentType * @return */
        public static String xmlHttpProxy(String url,String xml,String method,String contentType){
            InputStream is = null;
            OutputStreamWriter os = null;
            try {
                URL _url = new URL(url);
                HttpURLConnection conn = (HttpURLConnection) _url.openConnection();
                conn.setDoInput(true);   
                conn.setDoOutput(true);   
                conn.setRequestProperty("Content-type", "text/xml");
                conn.setRequestProperty("Pragma:", "no-cache");  
                conn.setRequestProperty("Cache-Control", "no-cache");  
                conn.setRequestMethod("POST");
                os = new OutputStreamWriter(conn.getOutputStream());
                os.write(new String(xml.getBytes(contentType)));
                os.flush();
                //返回值
                is = conn.getInputStream();
                return getContent(is, "utf-8");
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally{
                try {
                    if(os!=null){os.close();}
                    if(is!=null){is.close();}
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
        /** * 解析返回的值 * @param is * @param charset * @return */
        public static String getContent(InputStream is, String charset) {
            String pageString = null;
            InputStreamReader isr = null;
            BufferedReader br = null;
            StringBuffer sb = null;
            try {
                isr = new InputStreamReader(is, charset);
                br = new BufferedReader(isr);
                sb = new StringBuffer();
                String line = null;
                while ((line = br.readLine()) != null) {
                    sb.append(line + "\n");
                }
                pageString = sb.toString();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (is != null){
                        is.close();
                    }
                    if(isr!=null){
                        isr.close();
                    }
                    if(br!=null){
                        br.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
                sb = null;
            }
            return pageString;
        }
        /** * 解析申请退款之后微信返回的值并进行存库操作 * @throws IOException * @throws JDOMException */
        public static Map<String, String> parseRefundXml(String refundXml) throws JDOMException, IOException{
            ParseXMLUtils.jdomParseXml(refundXml);
            StringReader read = new StringReader(refundXml);
            // 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
            InputSource source = new InputSource(read);
            // 创建一个新的SAXBuilder
            SAXBuilder sb = new SAXBuilder();
            // 通过输入源构造一个Document
            org.jdom.Document doc;
            doc = (org.jdom.Document) sb.build(source);
            org.jdom.Element root = doc.getRootElement();// 指向根节点
            List<org.jdom.Element> list = root.getChildren();
            Map<String, String> refundOrderMap = new HashMap<String, String>();
            if(list!=null&&list.size()>0){
                for (org.jdom.Element element : list) {
                    refundOrderMap.put(element.getName(), element.getText());
                }
                return refundOrderMap;
                }
            return null;
        }
        /** * 解析申请退款之后微信退款回调返回的字符串中内容 * @throws IOException * @throws JDOMException */
        public static Map<String, String> parseRefundNotifyXml(String refundXml) throws JDOMException, IOException{
            ParseXMLUtils.jdomParseXml(refundXml);
            StringReader read = new StringReader(refundXml);
            // 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
            InputSource source = new InputSource(read);
            // 创建一个新的SAXBuilder
            SAXBuilder sb = new SAXBuilder();
            // 通过输入源构造一个Document
            org.jdom.Document doc;
            doc = (org.jdom.Document) sb.build(source);
            org.jdom.Element root = doc.getRootElement();// 指向根节点
            List<org.jdom.Element> list = root.getChildren();
            Map<String, String> resultMap = new HashMap<>();
            if(list!=null&&list.size()>0){
                for (org.jdom.Element element : list){
                    resultMap.put(element.getName(), element.getText());
                }
            return resultMap;
            }
            return null;
        }
        /** * h5支付时 解析返回的值并返回prepareid * @throws IOException * @throws JDOMException */
        public static Map<String, String> getUrl(Unifiedorder unifiedorder) throws JDOMException, IOException{
            String xmlInfo = HttpXmlUtils.xmlH5Info(unifiedorder);
            String wxUrl = weixinConstant.URL;
            String method = "POST";
            String weixinPost = HttpXmlUtils.httpsRequest(wxUrl, method, xmlInfo).toString();
            ParseXMLUtils.jdomParseXml(weixinPost);
            StringReader read = new StringReader(weixinPost);
            // 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
            InputSource source = new InputSource(read);
            // 创建一个新的SAXBuilder
            SAXBuilder sb = new SAXBuilder();
            // 通过输入源构造一个Document
            org.jdom.Document doc;
            doc = (org.jdom.Document) sb.build(source);
            org.jdom.Element root = doc.getRootElement();// 指向根节点
            List<org.jdom.Element> list = root.getChildren();
            String prepayId =null;
            Map<String, String> msg = new HashMap<String, String>();
            if(list!=null&&list.size()>0){
                for (org.jdom.Element element : list) {
                msg.put(element.getName(), element.getText());
                }
                }
            return msg;
        }
        /** * 解析返回的值并返回prepareid * @throws IOException * @throws JDOMException */
        public static String getPrepareId(Unifiedorder unifiedorder) throws JDOMException, IOException{
            String xmlInfo = HttpXmlUtils.xmlInfo(unifiedorder);
            String wxUrl = weixinConstant.URL;
            String method = "POST";
            String weixinPost = HttpXmlUtils.httpsRequest(wxUrl, method, xmlInfo).toString();
            ParseXMLUtils.jdomParseXml(weixinPost);
            StringReader read = new StringReader(weixinPost);
            // 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
            InputSource source = new InputSource(read);
            // 创建一个新的SAXBuilder
            SAXBuilder sb = new SAXBuilder();
            // 通过输入源构造一个Document
            org.jdom.Document doc;
            doc = (org.jdom.Document) sb.build(source);
            org.jdom.Element root = doc.getRootElement();// 指向根节点
            List<org.jdom.Element> list = root.getChildren();
            String prepayId =null;
            if(list!=null&&list.size()>0){
                for (org.jdom.Element element : list) {
                    if ( "prepay_id".equals(element.getName())) {
                        prepayId= element.getText();
                        break;
                    }
                }
                }
            return prepayId;
        }
        /** * 向微信发送企业付款请求并解析返回结果 * @throws IOException * @throws JDOMException */
        public static Map<String, String> getTransfersMap(Transfers transfers) throws JDOMException, IOException{
            String xmlInfo = HttpXmlUtils.xmlTransfer(transfers);
            String wxUrl = weixinConstant.WITHDRAW_URL;
            String method = "POST";
            String weixinPost = HttpXmlUtils.httpsRequest(wxUrl, method, xmlInfo).toString();
            ParseXMLUtils.jdomParseXml(weixinPost);
            StringReader read = new StringReader(weixinPost);
            // 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
            InputSource source = new InputSource(read);
            // 创建一个新的SAXBuilder
            SAXBuilder sb = new SAXBuilder();
            // 通过输入源构造一个Document
            org.jdom.Document doc;
            doc = (org.jdom.Document) sb.build(source);
            org.jdom.Element root = doc.getRootElement();// 指向根节点
            List<org.jdom.Element> list = root.getChildren();
            Map<String, String> transferMap=new HashMap<>();
            if(list!=null&&list.size()>0){
                for (org.jdom.Element element : list) {
                    transferMap.put(element.getName(), element.getText());
                }
                }
            return transferMap;
        }
        /** * 构造退款xml参数 * @param xml * @return */
        public static String refundXml(Unifiedorder unifiedorder){
                xStream.autodetectAnnotations(true);
                xStream.alias("xml", Unifiedorder.class);
                return xStream.toXML(unifiedorder);
        }
        /** * 构造企业付款xml参数 * @param xml * @return */
        public static String transferXml(Transfers transfers){
                xStream.autodetectAnnotations(true);
                xStream.alias("xml", Transfers.class);
                return xStream.toXML(transfers);
        }
        /** * 构造xml参数 * @param xml * @return */
        public static String xmlInfo(Unifiedorder unifiedorder){
    
            if(unifiedorder!=null){
                StringBuffer bf = new StringBuffer();
                bf.append("<xml>");
    
                bf.append("<appid><![CDATA[");
                bf.append(unifiedorder.getAppid());
                bf.append("]]></appid>");
    
                bf.append("<mch_id><![CDATA[");
                bf.append(unifiedorder.getMch_id());
                bf.append("]]></mch_id>");
    
                bf.append("<nonce_str><![CDATA[");
                bf.append(unifiedorder.getNonce_str());
                bf.append("]]></nonce_str>");
    
                bf.append("<sign><![CDATA[");
                bf.append(unifiedorder.getSign());
                bf.append("]]></sign>");
    
                bf.append("<body><![CDATA[");
                bf.append(unifiedorder.getBody());
                bf.append("]]></body>");
    
                bf.append("<detail><![CDATA[");
                bf.append(unifiedorder.getDetail());
                bf.append("]]></detail>");
    
                bf.append("<attach><![CDATA[");
                bf.append(unifiedorder.getAttach());
                bf.append("]]></attach>");
    
                bf.append("<out_trade_no><![CDATA[");
                bf.append(unifiedorder.getOut_trade_no());
                bf.append("]]></out_trade_no>");
    
                bf.append("<total_fee><![CDATA[");
                bf.append(unifiedorder.getTotal_fee());
                bf.append("]]></total_fee>");
    
                bf.append("<spbill_create_ip><![CDATA[");
                bf.append(unifiedorder.getSpbill_create_ip());
                bf.append("]]></spbill_create_ip>");
    
                bf.append("<time_start><![CDATA[");
                bf.append(unifiedorder.getTime_start());
                bf.append("]]></time_start>");
    
                bf.append("<time_expire><![CDATA[");
                bf.append(unifiedorder.getTime_expire());
                bf.append("]]></time_expire>");
    
                bf.append("<notify_url><![CDATA[");
                bf.append(unifiedorder.getNotify_url());
                bf.append("]]></notify_url>");
    
                bf.append("<trade_type><![CDATA[");
                bf.append(unifiedorder.getTrade_type());
                bf.append("]]></trade_type>");
    
                bf.append("</xml>");
                return bf.toString();
            }
            return "";
        }
        /** * 构造xml参数 * @param xml * @return */
        public static String xmlH5Info(Unifiedorder unifiedorder){
            if(unifiedorder!=null){
                StringBuffer bf = new StringBuffer();
                bf.append("<xml>");
    
                bf.append("<appid><![CDATA[");
                bf.append(unifiedorder.getAppid());
                bf.append("]]></appid>");
    
                bf.append("<mch_id><![CDATA[");
                bf.append(unifiedorder.getMch_id());
                bf.append("]]></mch_id>");
    
                bf.append("<nonce_str><![CDATA[");
                bf.append(unifiedorder.getNonce_str());
                bf.append("]]></nonce_str>");
    
                bf.append("<sign><![CDATA[");
                bf.append(unifiedorder.getSign());
                bf.append("]]></sign>");
    
                bf.append("<body><![CDATA[");
                bf.append(unifiedorder.getBody());
                bf.append("]]></body>");
    
    
                bf.append("<attach><![CDATA[");
                bf.append(unifiedorder.getAttach());
                bf.append("]]></attach>");
    
                bf.append("<out_trade_no><![CDATA[");
                bf.append(unifiedorder.getOut_trade_no());
                bf.append("]]></out_trade_no>");
    
                bf.append("<total_fee><![CDATA[");
                bf.append(unifiedorder.getTotal_fee());
                bf.append("]]></total_fee>");
    
                bf.append("<spbill_create_ip><![CDATA[");
                bf.append(unifiedorder.getSpbill_create_ip());
                bf.append("]]></spbill_create_ip>");
    
                bf.append("<notify_url><![CDATA[");
                bf.append(unifiedorder.getNotify_url());
                bf.append("]]></notify_url>");
    
                bf.append("<trade_type><![CDATA[");
                bf.append(unifiedorder.getTrade_type());
                bf.append("]]></trade_type>");
    
                bf.append("<scene_info><![CDATA[");
                bf.append(unifiedorder.getScene_info());
                bf.append("]]></scene_info>");
    
                bf.append("</xml>");
                return bf.toString();
            }
            return "";
        }
        /** * 构造退款xml参数 * @param xml * @return */
        public static String xmlTransfer(Transfers transfers){
    
            if(transfers!=null){
                StringBuffer bf = new StringBuffer();
                bf.append("<xml>");
    
                bf.append("<mch_appid><![CDATA[");
                bf.append(transfers.getMch_appid());
                bf.append("]]></mch_appid>");
    
                bf.append("<mchid><![CDATA[");
                bf.append(transfers.getMchid());
                bf.append("]]></mchid>");
    
                bf.append("<nonce_str><![CDATA[");
                bf.append(transfers.getNonce_str());
                bf.append("]]></nonce_str>");
    
                bf.append("<sign><![CDATA[");
                bf.append(transfers.getSign());
                bf.append("]]></sign>");
    
                bf.append("<partner_trade_no><![CDATA[");
                bf.append(transfers.getPartner_trade_no());
                bf.append("]]></partner_trade_no>");
    
    
                bf.append("<openid><![CDATA[");
                bf.append(transfers.getOpenid());
                bf.append("]]></openid>");
    
                bf.append("<check_name><![CDATA[");
                bf.append(transfers.getCheck_name());
                bf.append("]]></check_name>");
    
                bf.append("<amount><![CDATA[");
                bf.append(transfers.getAmount());
                bf.append("]]></amount>");
    
                bf.append("<desc><![CDATA[");
                bf.append(transfers.getDesc());
                bf.append("]]></desc>");
    
                bf.append("<spbill_create_ip><![CDATA[");
                bf.append(transfers.getSpbill_create_ip());
                bf.append("]]></spbill_create_ip>");
    
                bf.append("</xml>");
                return bf.toString();
            }
            return "";
        }
        /** * post请求并得到返回结果 * @param requestUrl * @param requestMethod * @param output * @return */
        public static String httpsRequest(String requestUrl, String requestMethod, String output) {
            try{
                URL url = new URL(requestUrl);
                HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
                connection.setDoOutput(true);
                connection.setDoInput(true);
                connection.setUseCaches(false);
                connection.setRequestMethod(requestMethod);
                if (null != output) {
                    OutputStream outputStream = connection.getOutputStream();
                    outputStream.write(output.getBytes("UTF-8"));
                    outputStream.close();
                }
                // 从输入流读取返回内容
                InputStream inputStream = connection.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                String str = null;
                StringBuffer buffer = new StringBuffer();
                while ((str = bufferedReader.readLine()) != null) {
                    buffer.append(str);
                }
                bufferedReader.close();
                inputStreamReader.close();
                inputStream.close();
                inputStream = null;
                connection.disconnect();
                return buffer.toString();
            }catch(Exception ex){
                ex.printStackTrace();
            }
            return "";
        }
    }

/** * 微信支付相关的常量 * @author yangfuren * @since 2017/08/16 */
    public class weixinConstant { 
        /** * 微信支付API秘钥 第一次登录时设置的 */
        public static final String KEY = "";
    
        /** * url */
        public static final String URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        /** * 退款url */
        public static final String REFUND_URL = "https://api.mch.weixin.qq.com/secapi/pay/refund";
        /** * 证书地址 退款及h5支付使用 */
        public static final String PATH ="";
        /** * 付款url */
        public static final String WITHDRAW_URL="https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers";
    }

import java.security.MessageDigest;
    
    public class MD5Util { 
    
        private static String byteArrayToHexString(byte b[]) {
            StringBuffer resultSb = new StringBuffer();
            for (int i = 0; i < b.length; i++)
                resultSb.append(byteToHexString(b[i]));
    
            return resultSb.toString();
        }
    
        private static String byteToHexString(byte b) {
            int n = b;
            if (n < 0)
                n += 256;
            int d1 = n / 16;
            int d2 = n % 16;
            return hexDigits[d1] + hexDigits[d2];
        }
    
        public static String MD5Encode(String origin, String charsetname) {
            String resultString = null;
            try {
                resultString = new String(origin);
                MessageDigest md = MessageDigest.getInstance("MD5");
                if (charsetname == null || "".equals(charsetname))
                    resultString = byteArrayToHexString(md.digest(resultString
                            .getBytes()));
                else
                    resultString = byteArrayToHexString(md.digest(resultString
                            .getBytes(charsetname)));
            } catch (Exception exception) {
            }
            return resultString;
        }
    
        private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
    
    }

统一下单提交为微信的参数

import java.io.Serializable;
    
    /** * 统一下单提交为微信的参数 * @author * @date 2017年08月11日 */
    public class Unifiedorder implements Serializable{ 
        private static final long serialVersionUID = 1L;
        //微信支付表id
        private Integer weixinId;
        //微信分配的公众账号ID（企业号corpid即为此appId）
        private String appid;
        //商户id
        private String mch_id;
        //终端设备号(门店号或收银设备ID)，注意：PC网页或公众号内支付请传"WEB"
        private String device_info;
        //随机字符串:数字+大写字母的组合，32位
        private String nonce_str;
        //签名
        private String sign;
        //商品或支付单简要描述
        private String body;
        //商品名称明细列表
        private String detail;
        //附加参数（例如：用于区别本商户不同的分店）
        private String attach;
        //商户系统内部的订单号
        private String out_trade_no;
        //货币类型:符合ISO 4217标准的三位字母代码，默认人民币：CNY
        private String fee_type;
        //总金额
        private int total_fee;
        //APP和网页支付提交[用户端ip]，Native支付填调用微信支付API的机器IP。
        private String spbill_create_ip;
        //订单生成时间，格式为yyyyMMddHHmmss，
        private String time_start;
        //订单失效时间，格式为yyyyMMddHHmmss，最短失效时间间隔必须大于5分钟[支付宝是30分钟，同样30分钟]
        private String time_expire;
        //商品标记，代金券或立减优惠功能的参数
        private String goods_tag;
        //接收微信支付异步通知回调地址
        private String notify_url;
        //交易类型:JSAPI，NATIVE，APP h5为 MWEB
        private String trade_type;
        //trade_type=NATIVE，此参数必传。此id为二维码中包含的商品ID，商户自行定义。
        private String product_id;
        //no_credit--指定不能使用信用卡支付
        private String limit_pay;
        //trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识
        private String openid;
        //商户内部自己的退款单号
        private String out_refund_no;
        //退款总金额单位为分
        private int refund_fee;
        //操作员的id默认为mch_id
        private String op_user_id;
        //微信官方提供的订单号
        private String prepayid;
        //记录所对应的member
        private Member member;
        //返回给微信的状态码（用于支付回调时）
        public String return_code;
        //微信h5支付时候的场景信息官方的信息模板 {"h5_info"://h5支付固定传"h5_info" 
        //{"type":"",//场景类型 "wap_url":"",//WAP网站URL地址"wap_name": ""//WAP 网站名}}
        public String scene_info;
        public String getScene_info() {
            return scene_info;
        }
        public void setScene_info(String scene_info) {
            this.scene_info = scene_info;
        }
        public String getReturn_code() {
            return return_code;
        }
        public void setReturn_code(String return_code) {
            this.return_code = return_code;
        }
        public String getAppid() {
            return appid;
        }
        public String getMch_id() {
            return mch_id;
        }
        public String getDevice_info() {
            return device_info;
        }
        public String getNonce_str() {
            return nonce_str;
        }
        public String getSign() {
            return sign;
        }
        public String getBody() {
            return body;
        }
        public String getDetail() {
            return detail;
        }
        public String getAttach() {
            return attach;
        }
        public String getOut_trade_no() {
            return out_trade_no;
        }
        public String getFee_type() {
            return fee_type;
        }
        public int getTotal_fee() {
            return total_fee;
        }
        public String getSpbill_create_ip() {
            return spbill_create_ip;
        }
        public String getTime_start() {
            return time_start;
        }
        public String getTime_expire() {
            return time_expire;
        }
        public String getGoods_tag() {
            return goods_tag;
        }
        public String getNotify_url() {
            return notify_url;
        }
        public String getTrade_type() {
            return trade_type;
        }
        public String getProduct_id() {
            return product_id;
        }
        public String getLimit_pay() {
            return limit_pay;
        }
        public String getOpenid() {
            return openid;
        }
        public void setAppid(String appid) {
            this.appid = appid;
        }
        public void setMch_id(String mch_id) {
            this.mch_id = mch_id;
        }
        public void setDevice_info(String device_info) {
            this.device_info = device_info;
        }
        public void setNonce_str(String nonce_str) {
            this.nonce_str = nonce_str;
        }
        public void setSign(String sign) {
            this.sign = sign;
        }
        public void setBody(String body) {
            this.body = body;
        }
        public void setDetail(String detail) {
            this.detail = detail;
        }
        public void setAttach(String attach) {
            this.attach = attach;
        }
        public void setOut_trade_no(String out_trade_no) {
            this.out_trade_no = out_trade_no;
        }
        public void setFee_type(String fee_type) {
            this.fee_type = fee_type;
        }
        public void setTotal_fee(int total_fee) {
            this.total_fee = total_fee;
        }
        public void setSpbill_create_ip(String spbill_create_ip) {
            this.spbill_create_ip = spbill_create_ip;
        }
        public void setTime_start(String time_start) {
            this.time_start = time_start;
        }
        public void setTime_expire(String time_expire) {
            this.time_expire = time_expire;
        }
        public void setGoods_tag(String goods_tag) {
            this.goods_tag = goods_tag;
        }
        public void setNotify_url(String notify_url) {
            this.notify_url = notify_url;
        }
        public void setTrade_type(String trade_type) {
            this.trade_type = trade_type;
        }
        public void setProduct_id(String product_id) {
            this.product_id = product_id;
        }
        public void setLimit_pay(String limit_pay) {
            this.limit_pay = limit_pay;
        }
        public void setOpenid(String openid) {
            this.openid = openid;
        }
        public String getOut_refund_no() {
            return out_refund_no;
        }
        public void setOut_refund_no(String out_refund_no) {
            this.out_refund_no = out_refund_no;
        }
        public int getRefund_fee() {
            return refund_fee;
        }
        public void setRefund_fee(int refund_fee) {
            this.refund_fee = refund_fee;
        }
        public Integer getWeixinId() {
            return weixinId;
        }
        public void setWeixinId(Integer weixinId) {
            this.weixinId = weixinId;
        }
        public Member getMember() {
            return member;
        }
        public void setMember(Member member) {
            this.member = member;
        }
        public String getPrepayid() {
            return prepayid;
        }
        public void setPrepayid(String prepayid) {
            this.prepayid = prepayid;
        }
        public String getOp_user_id() {
            return op_user_id;
        }
        public void setOp_user_id(String op_user_id) {
            this.op_user_id = op_user_id;
        }
    
    }

将参数传递给ios，ios会通过我们传递的参数调起微信支付。在生成签名时，可以将生成的sign和传入的appid，随机字符串，时间戳，微信官方的订单号，输入到[https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=20\_1][https_pay.weixin.qq.com_wiki_doc_api_app_app.php_chapter_20_1]中按照顺序输入参数并生成sign看和你的sign是否一致。

[https_open.weixin.qq.com]: https://open.weixin.qq.com/
[SouthEast]: /images/20220604/ad814eefcbdb49a99863f59f761a435a.png
[https_pay.weixin.qq.com_index.php_core_home_login_return_url_2F]: https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F
[SouthEast 1]: /images/20220604/ab11bd759947479da5a81ed4a7290167.png
[SouthEast 2]: /images/20220604/1b66f52190704768b5acdb579f179de8.png
[SouthEast 3]: /images/20220604/c63945623cdc45788f8efebe385f8f4a.png
[SouthEast 4]: /images/20220604/77234b27895b4515bdfefff396931843.png
[https_pay.weixin.qq.com_wiki_doc_api_app_app.php_chapter_20_1]: https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=20_1