【微信支付】springboot 微信app支付包括回调通知

由于微信技术文档比较坑。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
那就自己记录下吧
废话不多说了，从一个demo说起
怎么用idea创建一个项目不多说了

第一步，添加依赖

添加pom中的依赖

<dependency><groupId>com.github.wxpay</groupId><artifactId>wxpay-sdk</artifactId><version>0.0.3</version>
</dependency>

第二步，添加微信配置

这里解释下，这三个关键的东西，
appid需要的是认证过的微信公众平台的appid
mchID是商户平台的商户号
key是商户平台里的

这3个参数可以从微信的商户平台取

server.port=8080
#服务器域名地址
server.service-domain = http://127.0.0.1:8080#微信app支付
pay.wxpay.app.appID = xxx
pay.wxpay.app.mchID = xxx
pay.wxpay.app.key = xxx
#从微信商户平台下载的安全证书存放的路径、我放在resources下面,切记一定要看看target目录下的class文件下有没有打包apiclient_cert.p12文件
pay.wxpay.app.certPath = static/cert/wxpay/apiclient_cert.p12
#微信支付成功的异步通知接口
pay.wxpay.app.payNotifyUrl=${server.service-domain}/api/wxPay/notify

第三步，添加配置文件类

package com.wxpay.demo.config;import com.github.wxpay.sdk.WXPayConfig;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;import java.io.InputStream;/*** 应用模块名称* Copyright: Copyright (C) 2020 DLANGEL, Inc. All rights reserved.* Company: 大连安琪科技有限公司** @author Rex* @since 2020/6/12 10:23*/
@Component
@ConfigurationProperties(prefix = "pay.wxpay.app")
public class WxPayAppConfig implements WXPayConfig {/*** appID*/private String appID;/*** 商户号*/private String mchID;/*** API 密钥*/private String key;/*** API证书绝对路径 (本项目放在了 resources/cert/wxpay/apiclient_cert.p12")*/private String certPath;/*** HTTP(S) 连接超时时间，单位毫秒*/private int httpConnectTimeoutMs = 8000;/*** HTTP(S) 读数据超时时间，单位毫秒*/private int httpReadTimeoutMs = 10000;/*** 微信支付异步通知地址*/private String payNotifyUrl;/*** 微信退款异步通知地址*/private String refundNotifyUrl;/*** 获取商户证书内容（这里证书需要到微信商户平台进行下载）** @return 商户证书内容*/@Overridepublic InputStream getCertStream() {InputStream certStream  =getClass().getClassLoader().getResourceAsStream(certPath);return certStream;}@Overridepublic String getAppID() {return appID;}public void setAppID(String appID) {this.appID = appID;}@Overridepublic String getMchID() {return mchID;}public void setMchID(String mchID) {this.mchID = mchID;}@Overridepublic String getKey() {return key;}public void setKey(String key) {this.key = key;}public String getCertPath() {return certPath;}public void setCertPath(String certPath) {this.certPath = certPath;}@Overridepublic int getHttpConnectTimeoutMs() {return httpConnectTimeoutMs;}public void setHttpConnectTimeoutMs(int httpConnectTimeoutMs) {this.httpConnectTimeoutMs = httpConnectTimeoutMs;}@Overridepublic int getHttpReadTimeoutMs() {return httpReadTimeoutMs;}public void setHttpReadTimeoutMs(int httpReadTimeoutMs) {this.httpReadTimeoutMs = httpReadTimeoutMs;}public String getPayNotifyUrl() {return payNotifyUrl;}public void setPayNotifyUrl(String payNotifyUrl) {this.payNotifyUrl = payNotifyUrl;}public String getRefundNotifyUrl() {return refundNotifyUrl;}public void setRefundNotifyUrl(String refundNotifyUrl) {this.refundNotifyUrl = refundNotifyUrl;}
}

第四步，添加Controller

package com.wxpay.demo.controller;import com.wxpay.demo.common.ResultMap;
import com.wxpay.demo.service.WxPayService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;/*** 应用模块名称* Copyright: Copyright (C) 2020 DLANGEL, Inc. All rights reserved.* Company: 大连安琪科技有限公司** @author Rex* @since 2020/6/12 11:16*/
@RestController
@RequestMapping("/wxPay")
public class WxPayController {@Autowiredprivate WxPayService wxPayService;/*** 统一下单接口*/@GetMapping("/unifiedOrder")public ResultMap unifiedOrder(@RequestParam String orderNo,@RequestParam double amount,@RequestParam String body,HttpServletRequest request) {try {// 1、验证订单是否存在// 2、开始微信支付统一下单ResultMap resultMap = wxPayService.unifiedOrder(orderNo, amount, body);return resultMap;//系统通用的返回结果集，见文章末尾} catch (Exception e) {return ResultMap.error("运行异常，请联系管理员");}}/*** 微信支付异步通知*/@RequestMapping(value = "/notify")public String payNotify(HttpServletRequest request) {InputStream is = null;String xmlBack = "<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[报文为空]]></return_msg></xml> ";try {is = request.getInputStream();// 将InputStream转换成StringBufferedReader reader = new BufferedReader(new InputStreamReader(is));StringBuilder sb = new StringBuilder();String line = null;while ((line = reader.readLine()) != null) {sb.append(line + "\n");}xmlBack = wxPayService.notify(sb.toString());} catch (Exception e) {System.out.println("微信手机支付回调通知失败：" + e);} finally {if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}return xmlBack;}}

第五步，创建service接口和实现

package com.wxpay.demo.service;import com.wxpay.demo.common.ResultMap;/*** 应用模块名称* Copyright: Copyright (C) 2020 DLANGEL, Inc. All rights reserved.* Company: 大连安琪科技有限公司** @author Rex* @since 2020/6/12 11:22*/
public interface WxPayService {/*** @Description: 微信支付统一下单* @param orderNo: 订单编号* @param amount: 实际支付金额* @param body: 订单描述* @Author:* @Date: 2019/8/1* @return*/ResultMap unifiedOrder(String orderNo, double amount, String body) ;/*** @Description: 订单支付异步通知* @param notifyStr: 微信异步通知消息字符串* @Author:* @Date: 2019/8/1* @return*/String notify(String notifyStr) throws Exception;/*** @Description: 退款* @param orderNo: 订单编号* @param amount: 实际支付金额* @param refundReason: 退款原因* @Author: XCK* @Date: 2019/8/6* @return*/ResultMap refund(String orderNo, double amount, String refundReason);}

package com.wxpay.demo.service.impl;import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.github.wxpay.sdk.WXPay;
import com.github.wxpay.sdk.WXPayUtil;
import com.wxpay.demo.common.ResultMap;
import com.wxpay.demo.config.WxPayAppConfig;
import com.wxpay.demo.service.WxPayService;
import jdk.nashorn.internal.ir.annotations.Reference;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.HashMap;
import java.util.Map;/*** 应用模块名称* Copyright: Copyright (C) 2020 DLANGEL, Inc. All rights reserved.* Company: 大连安琪科技有限公司** @author Rex* @since 2020/6/12 11:22*/
@Service
public class WxPayServiceImpl implements WxPayService {private final Logger logger = LoggerFactory.getLogger(WxPayServiceImpl.class);@Autowiredprivate WxPayAppConfig wxPayAppConfig;@Overridepublic ResultMap unifiedOrder(String orderNo, double amount, String body) {Map<String, String> returnMap = new HashMap<>();Map<String, String> responseMap = new HashMap<>();Map<String, String> requestMap = new HashMap<>();try {WXPay wxpay = new WXPay(wxPayAppConfig);requestMap.put("body", body);                                     // 商品描述requestMap.put("out_trade_no", orderNo);                          // 商户订单号requestMap.put("total_fee", String.valueOf((int) (amount * 100)));   // 总金额requestMap.put("spbill_create_ip", ""); // 终端IPrequestMap.put("trade_type", "APP");                              // App支付类型requestMap.put("notify_url", wxPayAppConfig.getPayNotifyUrl());   // 接收微信支付异步通知回调地址Map<String, String> resultMap = wxpay.unifiedOrder(requestMap);//获取返回码String returnCode = resultMap.get("return_code");String returnMsg = resultMap.get("return_msg");//若返回码为SUCCESS，则会返回一个result_code,再对该result_code进行判断if ("SUCCESS".equals(returnCode)) {String resultCode = resultMap.get("result_code");String errCodeDes = resultMap.get("err_code_des");if ("SUCCESS".equals(resultCode)) {responseMap = resultMap;}}if (responseMap == null || responseMap.isEmpty()) {return ResultMap.error("获取预支付交易会话标识失败");}// 3、签名生成算法Long time = System.currentTimeMillis() / 1000;String timestamp = time.toString();returnMap.put("appid", wxPayAppConfig.getAppID());returnMap.put("partnerid", wxPayAppConfig.getMchID());returnMap.put("prepayid", responseMap.get("prepay_id"));returnMap.put("noncestr", responseMap.get("nonce_str"));returnMap.put("timestamp", timestamp);returnMap.put("package", "Sign=WXPay");returnMap.put("sign", WXPayUtil.generateSignature(returnMap, wxPayAppConfig.getKey()));//微信支付签名return ResultMap.ok().put("data", returnMap);} catch (Exception e) {logger.error("订单号：{}，错误信息：{}", orderNo, e.getMessage());return ResultMap.error("微信支付统一下单失败");}}@Overridepublic String notify(String notifyStr) {String xmlBack = "<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[报文为空]]></return_msg></xml> ";try {// 转换成mapMap<String, String> resultMap = WXPayUtil.xmlToMap(notifyStr);WXPay wxpayApp = new WXPay(wxPayAppConfig);if (wxpayApp.isPayResultNotifySignatureValid(resultMap)) {String returnCode = resultMap.get("return_code");  //状态String outTradeNo = resultMap.get("out_trade_no");//商户订单号String transactionId = resultMap.get("transaction_id");if (returnCode.equals("SUCCESS")) {if (StringUtils.isNotBlank(outTradeNo)) {/*** 注意！！！* 请根据业务流程，修改数据库订单支付状态，和其他数据的相应状态**/logger.info("微信手机支付回调成功,订单号:{}", outTradeNo);xmlBack = "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>";}}}} catch (Exception e) {e.printStackTrace();}return xmlBack;}@Overridepublic ResultMap refund(String orderNo, double amount, String refundReason) {if (StringUtils.isBlank(orderNo)) {return ResultMap.error("订单编号不能为空");}if (amount <= 0) {return ResultMap.error("退款金额必须大于0");}Map<String, String> responseMap = new HashMap<>();Map<String, String> requestMap = new HashMap<>();WXPay wxpay = new WXPay(wxPayAppConfig);requestMap.put("out_trade_no", orderNo);requestMap.put("out_refund_no", "123456789");requestMap.put("total_fee", "订单支付时的总金额，需要从数据库查");requestMap.put("refund_fee", String.valueOf((int) (amount * 100)));//所需退款金额requestMap.put("refund_desc", refundReason);try {responseMap = wxpay.refund(requestMap);} catch (Exception e) {e.printStackTrace();}String return_code = responseMap.get("return_code");   //返回状态码String return_msg = responseMap.get("return_msg");     //返回信息if ("SUCCESS".equals(return_code)) {String result_code = responseMap.get("result_code");       //业务结果String err_code_des = responseMap.get("err_code_des");     //错误代码描述if ("SUCCESS".equals(result_code)) {//表示退款申请接受成功，结果通过退款查询接口查询//修改用户订单状态为退款申请中或已退款。退款异步通知根据需求，可选//return ResultMap.ok("退款申请成功");} else {logger.info("订单号:{}错误信息:{}", orderNo, err_code_des);return ResultMap.error(err_code_des);}} else {logger.info("订单号:{}错误信息:{}", orderNo, return_msg);return ResultMap.error(return_msg);}}}

第六步，添加通用返回结果

这个可以有自己的方法，无所谓的

package com.wxpay.demo.common;import org.apache.http.HttpStatus;import java.util.HashMap;
import java.util.Map;/*** 应用模块名称* Copyright: Copyright (C) 2020 DLANGEL, Inc. All rights reserved.* Company: 大连安琪科技有限公司** @author Rex* @since 2020/6/12 11:18*/
public class ResultMap extends HashMap<String, Object> {public ResultMap() {put("state", true);put("code", 0);put("msg", "success");}public static ResultMap error(int code, String msg) {ResultMap r = new ResultMap();r.put("state", false);r.put("code", code);r.put("msg", msg);return r;}public static ResultMap error(String msg) {return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);}public static ResultMap error() {return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");}public static ResultMap ok(String msg) {ResultMap r = new ResultMap();r.put("msg", msg);return r;}public static ResultMap ok(Map<String, Object> par) {ResultMap r = new ResultMap();r.putAll(par);return r;}public static ResultMap ok() {return new ResultMap();}public ResultMap put(String key, Object value) {super.put(key, value);return this;}}

第七步，调用方式

http://localhost:8080/wxPay/unifiedOrder?orderNo=123456789&amount=1&body=支付

然后会收到返回值，主要是拿到prepayid

{"msg":"success","code":0,"data":{"package":"Sign=WXPay","appid":"wx6c6878cc93e5258c","sign":"C32453E8E71EAE8BB0EAE9A3A23C10BD","partnerid":"1544894961","prepayid":"wx1214084649121595f6e455481682463100","noncestr":"Yqxgko2qqshfpEcH","timestamp":"1591942126"},"state":true}

进而可以给app调用这个接口了。从而调起微信支付

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