尚品汇总结八：支付模块（面试专用）

桃扇骨 2023-10-14 13:53 53阅读 0赞

# **一、支付宝介绍** #

## **1 支付宝简介** ##

[支付宝（中国）网络技术有限公司][Link 1] \[1\]  是国内的第三方支付平台，致力于提供“简单、安全、快速”的支付解决方案 \[2\]  。支付宝公司从2004年建立开始，始终以“信任”作为产品和服务的核心。旗下有“支付宝”与“支付宝钱包”两个独立品牌。自2014年第二季度开始成为当前全球最大的[移动支付][Link 2]厂商。

当用户提交订单会跳转到选择支付渠道页面！

![37c6409d979448d79a3c9fce1c01d2b3.png][]

当用户点击立即支付时生成支付的二维码

![150c5d4679ec4273b9e3ec4d0e5c87ea.png][]

使用支付宝app 进行扫码支付

![2dee9e4d76d24921914fc84e5169a365.png][]

## **2 过程分析** ##

![42396ec057f043b29dfeb8ebde4caffe.png][]

## **3 对接支付宝的准备工作** ##

1、申请条件

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> 1. &nbsp;企业或个体工商户可申请； 2. &nbsp;提供真实有效的营业执照，且支付宝账户名称需与营业执照主体一致； 3. &nbsp;网站能正常访问且页面信息有完整商品内容； 4. &nbsp;网站必须通过ICP备案，个体户备案需与账户主体一致。 （团购类网站不支持个体工商户签约） </td> 
 </tr> 
 </tbody> 
</table>

支付手续费

![e3ea5351919b454cb6ebc3612b80c1df.png][]

## **4 申请步骤：** ##

1.  支付宝商家中心中申请 [Alipay][]
2.  https://b.alipay.com/signing/productSetV2.htm?mrchportalwebServer=https%3A%2F%2Fmrchportalweb.alipay.com

![6e59956cc9a74501838b0bf5427fafc6.png][]

一个工作日后登录到蚂蚁金服开发者中心中：

![104408a49cdb4e19b5f8d34ba2f6ff03.png][]

可以查看到一个已经签约上线的应用。 其中非常重要的是这个**APPID**，需要记录下来之后的程序中要用到这个参数。

点击查看

![02c41cb63c4447188ec76429b10be897.png][]

到此为止，电商网站可以访问支付宝的最基本的准备已经完成。

支付宝开发手册：[小程序文档 - 支付宝文档中心][-]

# 二、支付功能实现 #

![24a8739128c5425f8c2b74efdd071005.png][]

## 1 思路分析 ##

1.  将支付数据保存到数据库，以便跟支付宝进行对账
2.  生成要支付的二维码

生成二维码需要的参数列表请参考官方文档

https://docs.open.alipay.com/api\_1/alipay.trade.page.pay/

## 2 保存支付信息 – 制作实体类 ##

表结构 payment\_info

![3633d055d67549fb88c7fd10100519fe.png][]

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> id </td> 
 <td style="border-color:#000000;vertical-align:top;width:314.35pt;"> 主键自动生成 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> out_trade_no </td> 
 <td style="vertical-align:top;width:314.35pt;"> 订单中已生成的对外交易编号。订单中获取 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> order_id </td> 
 <td style="vertical-align:top;width:314.35pt;"> 订单编号 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> payment_type </td> 
 <td style="vertical-align:top;width:314.35pt;"> 支付类型（微信与支付宝） </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> trade_no </td> 
 <td style="vertical-align:top;width:314.35pt;"> 交易号，回调时生成 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> total_amount </td> 
 <td style="vertical-align:top;width:314.35pt;"> 订单金额。订单中获取 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> subject </td> 
 <td style="vertical-align:top;width:314.35pt;"> 交易内容。利用商品名称拼接。 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> payment_status </td> 
 <td style="vertical-align:top;width:314.35pt;"> 支付状态，默认值未支付。 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> create_time </td> 
 <td style="vertical-align:top;width:314.35pt;"> 创建时间，当前时间。 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> callback_time </td> 
 <td style="vertical-align:top;width:314.35pt;"> 回调时间，初始为空，支付宝异步回调时记录 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:111.75pt;"> callback_content </td> 
 <td style="vertical-align:top;width:314.35pt;"> 回调信息，初始为空，支付宝异步回调时记录 </td> 
 </tr> 
 </tbody> 
</table>

PaymentStatus

<table> 
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 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> public enum PaymentStatus { &nbsp;&nbsp;&nbsp; UNPAID("未支付"), （）支付中 &nbsp;&nbsp;&nbsp; PAID("已支付"), &nbsp;&nbsp;&nbsp; PAY_FAIL("支付失败"), &nbsp;&nbsp;&nbsp; ClOSED("已关闭"); &nbsp;&nbsp;&nbsp; private String name ; &nbsp;&nbsp;&nbsp; PaymentStatus(String name) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; this.name=name; &nbsp;&nbsp;&nbsp; } } </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> </td> 
 </tr> 
 </tbody> 
</table>

## 3 编写支付宝支付接口 ##

### 4.1 制作AlipayClient工具类 ###

在resource中添加alipay.properties

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 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> alipay_url=https://openapi.alipay.com/gateway.do app_id=2018020102122556 app_private_key=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 alipay_public_key=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhkZi6W0wn/prX+NIIF9ATb5Z8ReKK4hFYtBrweDfGHD1mNW7YIZY4G5hE7S2Sry8eFXlFgSlBWlJ4fVnDaK9MkVThpwE2H65ooVlK/wLuyPqovIVpMt/utva5Ayuzv7eQOWK45FdLDNDlK8QLoBko6SS+YbnWnf7a+mrf4NAS4UFClpfe8Byqe8XIraO2Cg4Ko5Y5schX39rOAH8GlLdgqQRYVQ2dCnkIQ+L+I4Cy9Mvw3rIkTwt3MBU+AqREXY4r5Bn6cmmX/9MAJbFqrofGiUAqG+qbjTcZAzgNPfuiD0zXgt/YYjMQMzck75BOmwnYOam2ajODUSQn8Xybsa7wQIDAQAB return_payment_url=http://api.gmall.com/api/payment/alipay/callback/return notify_payment_url=http://xsiv7k.natappfree.cc/api/payment/alipay/callback/notify return_order_url=http://payment.gmall.com/pay/success.html <pre style="margin-left:0;text-align:justify;"></pre> </td> 
 </tr> 
 </tbody> 
</table>

创建配置类

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>package com.atguigu.gmall.payment.config;

@Configuration

@PropertySource("classpath:alipay.properties")

public class AlipayConfig {

&nbsp;&nbsp;&nbsp; @Value("${alipay_url}")

&nbsp;&nbsp;&nbsp; private String alipay_url;

&nbsp;&nbsp;&nbsp; @Value("${app_private_key}")

&nbsp;&nbsp;&nbsp; private String app_private_key;

&nbsp;&nbsp;&nbsp; @Value("${app_id}")

&nbsp;&nbsp;&nbsp; private String app_id;

&nbsp;&nbsp;&nbsp; public final static String format="json";

&nbsp;&nbsp;&nbsp; public final static String charset="utf-8";

&nbsp;&nbsp;&nbsp; public final static String sign_type="RSA2";

&nbsp;&nbsp;&nbsp; public static String return_payment_url;

&nbsp;&nbsp;&nbsp; public static&nbsp; String notify_payment_url;

&nbsp;&nbsp;&nbsp; public static&nbsp; String return_order_url;

&nbsp;&nbsp;&nbsp; public static&nbsp; String alipay_public_key;

&nbsp;&nbsp;&nbsp; @Value("${alipay_public_key}")

&nbsp;&nbsp;&nbsp; public&nbsp;&nbsp; void setAlipay_public_key(String alipay_public_key) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayConfig.alipay_public_key = alipay_public_key;

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; @Value("${return_payment_url}")

&nbsp;&nbsp;&nbsp; public&nbsp;&nbsp; void setReturn_url(String return_payment_url) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayConfig.return_payment_url = return_payment_url;

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; @Value("${notify_payment_url}")

&nbsp;&nbsp;&nbsp; public&nbsp;&nbsp; void setNotify_url(String notify_payment_url) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayConfig.notify_payment_url = notify_payment_url;

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; @Value("${return_order_url}")

&nbsp;&nbsp;&nbsp; public&nbsp;&nbsp; void setReturn_order_url(String return_order_url) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayConfig.return_order_url = return_order_url;

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; @Bean

&nbsp;&nbsp;&nbsp; public AlipayClient alipayClient(){

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do", APP_ID, APP_PRIVATE_KEY, FORMAT, CHARSET, ALIPAY_PUBLIC_KEY, SIGN_TYPE); //获得初始化的AlipayClient

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayClient alipayClient=new DefaultAlipayClient(alipay_url,app_id,app_private_key,format,charset, alipay_public_key,sign_type );

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return alipayClient;

&nbsp;&nbsp;&nbsp; }

}</code></pre> </td> 
 </tr> 
 </tbody> 
</table>

### 4.2 编写支付宝下单接口 ###

<table> 
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 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>实现类

package com.atguigu.gmall.payment.service.impl;

@Service

public class AlipayServiceImpl implements AlipayService {

&nbsp;&nbsp;&nbsp; @Autowired

&nbsp;&nbsp;&nbsp; private PaymentService paymentService;

&nbsp;&nbsp;&nbsp; @Autowired

&nbsp;&nbsp;&nbsp; private OrderFeignClient orderFeignClient;

&nbsp;&nbsp;&nbsp; @Autowired

&nbsp;&nbsp;&nbsp; private AlipayClient alipayClient;

&nbsp;&nbsp;&nbsp; @Override

&nbsp;&nbsp;&nbsp; public String createaliPay(Long orderId) throws AlipayApiException {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OrderInfo orderInfo&nbsp; = orderFeignClient.getOrderInfo(orderId);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 保存交易记录

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paymentService.savePaymentInfo(orderInfo, PaymentType.ALIPAY.name());

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 生产二维码

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();//创建API对应的request

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 同步回调

&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alipayRequest.setReturnUrl(AlipayConfig.return_payment_url);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 异步回调

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alipayRequest.setNotifyUrl(AlipayConfig.notify_payment_url);//在公共参数中设置回跳和通知地址

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 参数

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 声明一个map 集合

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HashMap&lt;String, Object&gt; map = new HashMap&lt;&gt;();

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map.put("out_trade_no",orderInfo.getOutTradeNo());

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map.put("product_code","FAST_INSTANT_TRADE_PAY");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map.put("total_amount",orderInfo.getTotalAmount());

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map.put("subject","test");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alipayRequest.setBizContent(JSON.toJSONString(map));

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return alipayClient.pageExecute(alipayRequest).getBody(); //调用SDK生成表单;

&nbsp;&nbsp;&nbsp; }
}</code></pre> </td> 
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 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre style="margin-left:0;text-align:justify;"></pre> <pre><code>AlipayController 
@Controller
@RequestMapping("/api/payment/alipay")
public class AlipayController {

&nbsp;&nbsp;&nbsp; @Autowired
&nbsp;&nbsp;&nbsp; private AlipayService alipayService;

&nbsp;&nbsp;&nbsp; &nbsp;@RequestMapping("submit/{orderId}")

@ResponseBody
&nbsp;&nbsp;&nbsp; public String submitOrder(@PathVariable(value = "orderId") Long orderId, HttpServletResponse response){
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String from = "";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; from = alipayService.createaliPay(orderId);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } catch (AlipayApiException e) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e.printStackTrace();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return from;
&nbsp;&nbsp;&nbsp; }
}</code></pre> </td> 
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</table>

# 三、 支付后回调—同步回调 #

![7c82c51fd8ca41c48bf0daf3af302c23.png][]

AlipayController

<table> 
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 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>/**
 * 支付宝回调
 * @return
 */
@RequestMapping("callback/return")
public String callBack() {
 // 同步回调给用户展示信息
 return "redirect:" + AlipayConfig.return_order_url;
}
</code></pre> </td> 
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</table>

这里requestMapping对应的路径必须与之前传给支付宝的AlipayConfig.*return\_order\_url*保持一致。

# 四、 支付宝回调—异步回调 #

![68c37b3d89354d489bb69cf9a49fe82f.png][]

异步回调有两个重要的职责：

**确认并记录用户已付款**，**通知电商模块**。新版本的支付接口已经取消了同步回调的支付结果传递。所以用户付款成功与否全看异步回调。

接收到回调要做的事情：

1.  验证回调信息的真伪
2.  验证用户付款的成功与否
3.  把新的支付状态写入支付信息表\{paymentInfo\}中。
4.  通知电商其他模块
5.  给支付宝返回回执。

AlipayController

<table> 
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 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>/**

&nbsp;&nbsp;&nbsp;&nbsp; * 支付宝异步回调&nbsp; 必须使用内网穿透

&nbsp;&nbsp;&nbsp;&nbsp; * @param paramMap

&nbsp;&nbsp;&nbsp;&nbsp; * @param request

&nbsp;&nbsp;&nbsp;&nbsp; * @return

&nbsp;&nbsp;&nbsp;&nbsp; */

&nbsp;&nbsp;&nbsp; @RequestMapping("callback/notify")
@ResponseBody

&nbsp;&nbsp;&nbsp; public String alipayNotify(@RequestParam Map&lt;String, String&gt; paramMap) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; System.out.println("回来了！");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boolean signVerified = false; //调用SDK验证签名

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; signVerified = AlipaySignature.rsaCheckV1(paramMap, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } catch (AlipayApiException e) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e.printStackTrace();

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 交易状态

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String trade_status = paramMap.get("trade_status");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String out_trade_no = paramMap.get("out_trade_no");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // true

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (signVerified) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // TODO 验签成功后，按照支付结果异步通知中的描述，对支付结果中的业务内容进行二次校验，校验成功后在response中返回success并继续商户自身业务处理，校验失败返回failure

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if ("TRADE_SUCCESS".equals(trade_status) || "TRADE_FINISHED".equals(trade_status)) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 但是，如果交易记录表中 PAID 或者 CLOSE&nbsp; 获取交易记录中的支付状态 通过outTradeNo来查询数据

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // select * from paymentInfo where out_trade_no=?

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PaymentInfo paymentInfo = paymentService.getPaymentInfo(out_trade_no, PaymentType.ALIPAY.name());

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (paymentInfo.getPaymentStatus() == PaymentStatus.PAID.name() || paymentInfo.getPaymentStatus() == PaymentStatus.ClOSED.name()) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "failure";

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 正常的支付成功，我们应该更新交易记录状态&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paymentService.paySuccess(out_trade_no,PaymentType.ALIPAY.name(), paramMap);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "success";

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // TODO 验签失败则记录异常日志，并在response中返回failure.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "failure";

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "failure";

&nbsp;&nbsp;&nbsp; }</code></pre> </td> 
 </tr> 
 </tbody> 
</table>

PaymentService

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>实现类

@Override

public PaymentInfo getPaymentInfo(String out_trade_no, String name) {

&nbsp;&nbsp;&nbsp; QueryWrapper&lt;PaymentInfo&gt; paymentInfoQueryWrapper = new QueryWrapper&lt;&gt;();

&nbsp;&nbsp;&nbsp; paymentInfoQueryWrapper.eq("out_trade_no", outTradeNo
).eq("payment_type", paymentType);

&nbsp;&nbsp;&nbsp; PaymentInfo paymentInfo = paymentInfoMapper.selectOne(paymentInfoQueryWrapper);

&nbsp;&nbsp;&nbsp; return paymentInfo;

}
@Override

public void paySuccess(String outTradeNo,String paymentType, Map&lt;String,String&gt; paramMap) {

&nbsp;&nbsp;&nbsp; PaymentInfo paymentInfo = this.getPaymentInfo(outTradeNo, paymentType);

&nbsp;&nbsp;&nbsp; if (paymentInfo.getPaymentStatus() == PaymentStatus.PAID.name() || paymentInfo.getPaymentStatus() == PaymentStatus.ClOSED.name()) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; PaymentInfo paymentInfoUpd = new PaymentInfo();

&nbsp;&nbsp;&nbsp; // update paymentInfo set PaymentStatus = PaymentStatus.PAID ,CallbackTime = new Date() where out_trade_no = ?

&nbsp;&nbsp;&nbsp; paymentInfoUpd.setPaymentStatus(PaymentStatus.PAID.name());

&nbsp;&nbsp;&nbsp; paymentInfoUpd.setCallbackTime(new Date());

&nbsp;&nbsp; &nbsp;paymentInfoUpd.setCallbackContent(paramMap.toString());

&nbsp;&nbsp;&nbsp; this.updatePaymentInfo(outTradeNo,paymentInfoUpd);

&nbsp;&nbsp;&nbsp; // 表示交易成功！

}
@Override
public void updatePaymentInfo(String outTradeNo, PaymentInfo paymentInfoUpd) {
&nbsp;&nbsp;&nbsp; QueryWrapper&lt;PaymentInfo&gt; queryWrapper = new QueryWrapper&lt;&gt;();
&nbsp;&nbsp;&nbsp; queryWrapper.eq("out_trade_no", outTradeNo);
&nbsp;&nbsp;&nbsp; paymentInfoMapper.update(paymentInfoUpd,queryWrapper);
}</code></pre> </td> 
 </tr> 
 </tbody> 
</table>

# 五、退款 #

直接在浏览器发起请求即可！

http://payment.gmall.com/refund?orderId=98

商户与客户协商一致的情况下，才可以退款！

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>// 发起退款！订单编号 http://payment.gmall.com/refund?orderId=118

@RequestMapping("refund/{orderId}")
@ResponseBody

public Result refund(@PathVariable(value = "orderId")Long orderId) {

&nbsp;&nbsp;&nbsp; // 调用退款接口

&nbsp;&nbsp;&nbsp; boolean flag = alipayService.refund(orderId);

&nbsp;&nbsp;&nbsp; return Result.ok(flag);

}</code></pre> </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> boolean refund(String orderId); </td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:top;width:426.1pt;"> <pre><code>@Override

public boolean refund(Long orderId) {

&nbsp;

&nbsp;&nbsp;&nbsp; AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();

&nbsp;&nbsp;&nbsp; OrderInfo orderInfo = orderFeignClient.getOrderInfo(orderId);

&nbsp;&nbsp;&nbsp; HashMap&lt;String, Object&gt; map = new HashMap&lt;&gt;();

&nbsp;&nbsp;&nbsp; map.put("out_trade_no", orderInfo.getOutTradeNo());

&nbsp;&nbsp;&nbsp; map.put("refund_amount", orderInfo.getTotalAmount());

&nbsp;&nbsp;&nbsp; map.put("refund_reason", "颜色浅了点");

&nbsp;&nbsp;&nbsp; // out_request_no

&nbsp;&nbsp;&nbsp; request.setBizContent(JSON.toJSONString(map));

&nbsp;&nbsp;&nbsp; AlipayTradeRefundResponse response = null;

&nbsp;&nbsp;&nbsp; try {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response = alipayClient.execute(request);

&nbsp;&nbsp;&nbsp; } catch (AlipayApiException e) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e.printStackTrace();

&nbsp;&nbsp;&nbsp; }

&nbsp;&nbsp;&nbsp; if (response.isSuccess()) {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // 更新交易记录 ： 关闭

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PaymentInfo paymentInfo = new PaymentInfo();

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paymentInfo.setPaymentStatus(PaymentStatus.ClOSED.name());

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paymentService.updatePaymentInfo(orderInfo.getOutTradeNo(), paymentInfo);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return true;

&nbsp;&nbsp;&nbsp; } else {

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return false;

&nbsp;&nbsp;&nbsp; }

}</code></pre> </td> 
 </tr> 
 </tbody> 
</table>

# 六、常见面试问题： #

1.  支付宝支付需要的参数？

公共的参数:

支付网关\\appID\\请求数据类型(json)\\编码\\公钥和私钥\\同步回调\\异步回调

支付接口的参数:

订单交易编号\\金额\\标题\\销售产品码

退款接口:

订单交易编号或者支付宝的交易号\\退款金额

1.  支付锁库存吗？

不锁,支付 用户在付钱呢,不能因为其他问题导致用户付钱失败.

1.  支付日志表（信息表） 记录了什么东西? （主要是看表里的字段）

作用:为了和支付宝那边 对账

订单交易编号\\金额\\支付类型(支付宝、微信)、支付宝交易号、回调时间和回调内容、支付状态

[Link 1]: https://baike.baidu.com/item/%E6%94%AF%E4%BB%98%E5%AE%9D%EF%BC%88%E4%B8%AD%E5%9B%BD%EF%BC%89%E7%BD%91%E7%BB%9C%E6%8A%80%E6%9C%AF%E6%9C%89%E9%99%90%E5%85%AC%E5%8F%B8/23241708
[Link 2]: https://baike.baidu.com/item/%E7%A7%BB%E5%8A%A8%E6%94%AF%E4%BB%98/565488
[37c6409d979448d79a3c9fce1c01d2b3.png]: https://img-blog.csdnimg.cn/37c6409d979448d79a3c9fce1c01d2b3.png
[150c5d4679ec4273b9e3ec4d0e5c87ea.png]: https://img-blog.csdnimg.cn/150c5d4679ec4273b9e3ec4d0e5c87ea.png
[2dee9e4d76d24921914fc84e5169a365.png]: https://img-blog.csdnimg.cn/2dee9e4d76d24921914fc84e5169a365.png
[42396ec057f043b29dfeb8ebde4caffe.png]: https://img-blog.csdnimg.cn/42396ec057f043b29dfeb8ebde4caffe.png
[e3ea5351919b454cb6ebc3612b80c1df.png]: https://img-blog.csdnimg.cn/e3ea5351919b454cb6ebc3612b80c1df.png
[Alipay]: https://www.alipay.com/
[6e59956cc9a74501838b0bf5427fafc6.png]: https://img-blog.csdnimg.cn/6e59956cc9a74501838b0bf5427fafc6.png
[104408a49cdb4e19b5f8d34ba2f6ff03.png]: https://img-blog.csdnimg.cn/104408a49cdb4e19b5f8d34ba2f6ff03.png
[02c41cb63c4447188ec76429b10be897.png]: https://img-blog.csdnimg.cn/02c41cb63c4447188ec76429b10be897.png
[-]: https://docs.open.alipay.com/270/105900/
[24a8739128c5425f8c2b74efdd071005.png]: https://img-blog.csdnimg.cn/24a8739128c5425f8c2b74efdd071005.png
[3633d055d67549fb88c7fd10100519fe.png]: https://img-blog.csdnimg.cn/3633d055d67549fb88c7fd10100519fe.png
[7c82c51fd8ca41c48bf0daf3af302c23.png]: https://img-blog.csdnimg.cn/7c82c51fd8ca41c48bf0daf3af302c23.png
[68c37b3d89354d489bb69cf9a49fe82f.png]: https://img-blog.csdnimg.cn/68c37b3d89354d489bb69cf9a49fe82f.png