微信APP支付

你好 ，博主是一个工作时限未满一年正在努力奋斗中的小白，文章中若有什么错误和不足之处欢迎大家在评论区指出和讨论。我这里的IDE用的是idea,springboot框架,具体开发过程是参照微信支付官方文档来的,链接
,调用的接口是统一下单接口,链接。
我的项目结构是这样的:

这里的appclient_cert.p12是微信证书文件 可以去官方文档看生成教程

pom.xml配置文件

我这里有的依赖是走的我本地的私服maven仓库，涉及到相应业务需要的依赖可自行添加

<?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>2.3.1.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>wxpay</artifactId><version>0.0.1-SNAPSHOT</version><name>wxpay</name><description>Demo project for Spring Boot</description><!--  指定私服仓库  --><repositories><repository></repository></repositories><!--  指定插件仓库  --><pluginRepositories><pluginRepository></pluginRepository></pluginRepositories><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>com.github.wxpay</groupId><artifactId>wxpay-sdk</artifactId><version>0.0.3</version></dependency><dependency><groupId>httpcomponents-httpcore</groupId><artifactId>httpcore</artifactId><version>4.0-alpha6</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.16.16</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.46</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version><exclusions><exclusion><groupId>io.swagger</groupId><artifactId>swagger-annotations</artifactId></exclusion><exclusion><groupId>io.swagger</groupId><artifactId>swagger-models</artifactId></exclusion></exclusions></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.swagger</groupId><artifactId>swagger-annotations</artifactId><version>1.5.22</version></dependency><dependency><groupId>io.swagger</groupId><artifactId>swagger-models</artifactId><version>1.5.22</version></dependency><dependency><groupId>com.wlld</groupId><artifactId>easyai</artifactId><version>1.0.0</version></dependency><dependency><groupId>com.shareData</groupId><artifactId>chainmarket</artifactId><version>1.0.0</version></dependency><dependency><groupId>com.wlld</groupId><artifactId>cup</artifactId><version>1.0.0</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

WXConfig工具类

package com.annaru.upms.payment.config;import com.github.wxpay.sdk.WXPayConfig;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.ClassUtils;import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.KeyStore;public class WXConfigUtil implements WXPayConfig {private byte[] certData;public static final String APP_ID = "这里是你的商户应用appid";public static final String KEY = "这里是你的商户KEY(32位api秘钥)";public static final String MCH_ID = "这里是你的商户id";public WXConfigUtil() throws Exception {String certPath = "src/main/resources/apiclient_cert.p12";//从微信商户平台下载的安全证书存放的路径File file = new File(certPath);InputStream certStream = new FileInputStream(file);this.certData = new byte[(int) file.length()];certStream.read(this.certData);certStream.close();}@Overridepublic String getAppID() {return APP_ID;}//mchid，商户号@Overridepublic String getMchID() {return MCH_ID;}@Overridepublic String getKey() {return KEY;}@Overridepublic InputStream getCertStream() {ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData);return certBis;}@Overridepublic int getHttpConnectTimeoutMs() {return 8000;}@Overridepublic int getHttpReadTimeoutMs() {return 10000;}
}

Service接口

package com.annaru.upms.payment.service;import java.math.BigDecimal;
import java.util.Map;public interface WxService {String doUnifiedOrder(String money) throws Exception;
}

Impl实现类

package com.annaru.upms.payment.service.impl;import com.annaru.upms.payment.config.WXConfigUtil;
import com.annaru.upms.payment.service.WxService;
import com.annaru.upms.payment.util.AmountUtils;
import com.github.wxpay.sdk.WXPay;
import com.github.wxpay.sdk.WXPayConstants;
import com.github.wxpay.sdk.WXPayUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.*;import static com.github.wxpay.sdk.WXPayUtil.MD5;@Service
@Slf4j
public class WxServiceImpl implements WxService {//定义一些业务会用到的常量public static final String SPBILL_CREATE_IP = "127.0.0.1";    //终端IPpublic static final String NOTIFY_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";    //通知地址public static final String TRADE_TYPE_APP = "APP";    //交易类型@Overridepublic String doUnifiedOrder(String money) throws Exception {try {WXConfigUtil config = new WXConfigUtil();WXPay wxpay = new WXPay(config);Map<String, String> data = new HashMap<>();data.put("appid", config.getAppID());data.put("mch_id", config.getMchID());data.put("nonce_str", WXPayUtil.generateNonceStr());String body = "test";data.put("body", body);SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");//获取当前时间//商户订单号生成方式: 根据当前系统时间加随机数生成,理论上是唯一的Random random = new Random();//定义随机数int length = random.nextInt(1000);Date date = new Date();String dateran = sdf.format(date);String outTradeNo = dateran+length;data.put("out_trade_no",outTradeNo);//终端IP地址data.put("spbill_create_ip", SPBILL_CREATE_IP);//异步通知地址(请注意必须是外网)data.put("notify_url", NOTIFY_URL);//交易类型data.put("trade_type", TRADE_TYPE_APP);//附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据data.put("attach", "");//价格data.put("total_fee", money);data.put("sign", WXPayUtil.generateSignature(data, config.getKey(),WXPayConstants.SignType.MD5));//使用官方API请求预付订单Map<String, String> response = wxpay.unifiedOrder(data);if ("SUCCESS".equals(response.get("return_code"))) {Map<String, String> param = new HashMap<>();//下面参数是用来生成签名的,可自行选择返回给前台param.put("appid", config.getAppID());param.put("mch_id", response.get("mch_id"));//微信生成的预支付会话标识,用于后续接口调用中使用,该值有效期为两小时param.put("prepay_id", response.get("prepay_id"));param.put("package", "Sign=WXPay");param.put("out_trade_no", data.get("out_trade_no"));param.put("notify_url", data.get("notify_url"));param.put("spbill_create_ip", data.get("spbill_create_ip"));param.put("nonce_str", WXPayUtil.generateNonceStr());param.put("timestamp", System.currentTimeMillis() / 1000 + "");//total_fee为价格  注意:价格的初始单位是分,现在传入的价格单位还是分,返回的结果是元
//                param.put("total_fee", AmountUtils.changeF2Y(money));param.put("total_fee",money);//上面参数改的话stringA签名规则也要改String stringA =  "appid=wx7de2a73268d104f3&device_info=WEB&mch_id=1559130801&nonce_str="+param.get("nonce_str")+"&notify_url=https://api.mch.weixin.qq.com/pay/unifiedorder&out_trade_no="+data.get("out_trade_no")+"&package=Sign=WXPay&prepay_id="+response.get("prepay_id")+"&result_code=SUCCESS" +"&spbill_create_ip=127.0.0.1&timestamp="+param.get("timestamp")+"&total_fee" +"="+param.get("total_fee")+"";String stringSignTemp=stringA+"&key=6466c3c49697436091a2e852cb15033e";//注：key为商户平台设置的密钥keyString sign =MD5(stringSignTemp).toUpperCase();//注：MD5签名方式  转大写param.put("sign", sign);param.put("device_info", "WEB");param.put("result_code", response.get("result_code"));//现在返回信息param是个map  要把它转换成xml格式方便显示StringBuffer stringBuffer = new StringBuffer("");stringBuffer.append("<xml>");Set<String> set = param.keySet();for (Iterator<String> it = set.iterator();it.hasNext();){String key = it.next();Object value = param.get(key);stringBuffer.append("<").append(key).append(">");stringBuffer.append(value);stringBuffer.append("</").append(key).append(">");}stringBuffer.append("</xml>");//这里的stringBuffer为一个xml格式的文本 作为参数传入微信回调String resultXml = stringBuffer.toString();try {config = new WXConfigUtil();} catch (Exception e) {e.printStackTrace();}String xmlBack = "";Map<String, String> notifyMap = null;try {notifyMap = WXPayUtil.xmlToMap(resultXml);         //调用官方SDK转换成map类型数据if (wxpay.isPayResultNotifySignatureValid(notifyMap)) {//验证签名是否有效，有效则进一步处理String return_code = response.get("return_code");//状态String out_trade_no = notifyMap.get("out_trade_no");//商户订单号if (return_code.equals("SUCCESS")) {if (out_trade_no != null) {//注意特殊情况: 订单已经退款,但收到了支付结果成功的通知,不应该把商户的订单状态从退款改成支付成功//注意特殊情况: 微信服务端同样的通知可能会多次发送给商户系统,所以数据持久化之前需要检查是否已经处理过了,处理了直接返回成功标志//下面为返回给前台的xml格式的数据log.info("微信支付回调成功订单号:{}", out_trade_no);xmlBack = "<xml>" + "<return_code><![CDATA["+response.get("return_code")+"]]></return_code>" +"<return_msg" +"><![CDATA" +"[OK]]></return_msg>" + "<sign" +"><![CDATA["+notifyMap.get("sign")+"]]></sign>"+"<out_trade_no><![CDATA["+notifyMap.get("out_trade_no")+"]]></out_trade_no>"+"<prepay_id><![CDATA["+notifyMap.get("prepay_id")+"]]></prepay_id>"+ "<total_fee><![CDATA["+notifyMap.get("total_fee")+"]]></total_fee>"+"</xml> ";} else {log.info("微信支付回调失败订单号:{}", out_trade_no);xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";}}return xmlBack;} else {// 签名错误的场景:如果数据中没有sign字段 也认为是签名错误log.error("支付回调通知签名错误");xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";return xmlBack;}} catch (Exception e) {log.error("支付回调通知失败", e);xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";}return xmlBack;}} catch (Exception e) {e.printStackTrace();throw new Exception("下单失败");}throw new Exception("下单失败");}}

实现类这里原本是两个接口,一个是返回xml格式的文本,另一个是回调接口,这里由于我的业务问题我合并成一个了,只需要传入一个金额调用统一下单接口返回一个prepay_id即可。这里踩过一个坑是签名算法,签名算法顺序不能错,具体步骤可以参照官方文档
校验签名有效性的链接

Controller层

package com.annaru.upms.payment.controller;import com.annaru.upms.payment.service.WxService;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.annotation.RequestScope;
import org.springframework.web.context.annotation.SessionScope;import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Map;@RestController
@RequestMapping("/order")
public class OrderController {@Autowiredprivate WxService wxService;@PostMapping("/wxpay")@ApiOperation("调用微信支付")public String wxAdd(String money) throws Exception {return wxService.doUnifiedOrder(money);}}

这里附上微信支付元分转换的工具类,业务需要的话可以加上,工具类转载于这位大佬的博客