SpringBoot集成微信支付V3_springboot接入微信支付v3架包

作者：很楠不爱3 | 2024-05-02 16:45:16

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springboot接入微信支付v3架包

河南循中网络科技有限公司 - 精心创作，详细分解，按照步骤，均可成功！

文章目录

吐槽！
此文章包含实现了哪些接口？
学习资料
集成微信支付V3
河南循中网络科技有限公司精心创作，若解决了您的问题，欢迎点赞+评论

吐槽！

科技应该以人为本，为人服务为宗旨，API的对接应该是很轻松的，就像支付宝一样，傻瓜式对接，哪怕是腾讯系的腾讯云相关的API接口服务，都非常容易对接，无论是文档还是Demo都非常舒服，哪怕小白也可以对接成功，但微信支付就很奇葩…之前对接v2版本支付系列接口几乎没有一次轻松的，现在的V3接口虽然好很多，但官方Demo写的…啥也不是。

不适合小白入门，网上关于微信支付V3的文章又少之又少，而且坑巨多…尤其是使用了某些工具类，然后少放一些，是让人呕血？搞不懂！！！，在此我推出如下傻瓜式对接，小白也可完成微信支付V3相关API的对接！！！

此文章包含实现了哪些接口？

实现的接口：JSAPI下单、小程序支付、申请退款

其余接口，可通过对应的微信支付API文档，根据不同的请求方式，调用对应的POST或GET请求工具方法，传入JSON对象即可完成，无需担心证书相关问题，证书封装在请求体内，直接调用封装好的POST或GET请求工具方法即可。

学习资料

接入前准备
 微信支付API文档

集成微信支付V3

什么是“商户证书”？什么是“平台证书”？

“商户证书”是指由商户申请的，包含商户的商户号、公司名称、公钥信息的证书。
”平台证书”是指由微信支付负责申请的，包含微信支付平台标识、公钥信息的证书。

获取商户证书

通过完成接入前准备，可获得3个API证书：apiclient_cert.p12、apiclient_cert.pem、apiclient_key.pem，但此证书为商户证书，跟平台证书是不一样的。

获取平台证书

大多数人在接入时，由于官方文档写的很…令人无语会忽略此步，博主就是忽略了此步骤，从而在调用API的时候，错误的使用了商户证书，导致报错：“应答的微信支付签名验证失败”。

java -jar CertificateDownloader-1.2.0-jar-with-dependencies.jar -f 商户私钥文件路径 -k 证书解密的密钥 -m 商户号 -o 证书保存路径  -s 商户证书序列号
1

商户私钥文件：apiclient_key.pem
证书解密的密钥：登陆商户平台【API安全】->【APIv3密钥】
商户证书序列号：登陆商户平台【API安全】->【API证书】->【查看证书】，可查看商户API证书序列号。

实践：

在D盘中创建D:\wechatPay文件。
将apiclient_cert.p12、apiclient_cert.pem、apiclient_key.pem放在文件目录下。
CMD命令进入D:\wechatPay，输入java -jar CertificateDownloader-1.2.0-jar-with-dependencies.jar -f 商户私钥文件路径 -k 证书解密的密钥 -m 商户号 -o 证书保存路径 -s 商户证书序列号，则可得到微信支付平台证书。

添加pom依赖

		<!-- 微信支付 -->
        <wechatpay-apache-httpclient.version>0.4.8</wechatpay-apache-httpclient.version>
		<!-- Hutool小而全的Java工具类库 -->
        <hutool-all.version>5.8.5</hutool-all.version>
        <!-- alibaba JSON -->
        <fastjson.version>2.0.11</fastjson.version>
        <!-- apache公共基础类 -->
        <commons-lang3.version>3.12.0</commons-lang3.version>
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		<!-- 微信支付 -->
        <dependency>
            <groupId>com.github.wechatpay-apiv3</groupId>
            <artifactId>wechatpay-apache-httpclient</artifactId>
            <version>${wechatpay-apache-httpclient.version}</version>
        </dependency>
		<!-- Hutool小而全的Java工具类库 -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>${hutool-all.version}</version>
        </dependency>
        <!-- alibaba JSON -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
        <!-- apache公共基础类 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>
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common的pom文件

<?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>
    <groupId>com.xz</groupId>
    <artifactId>common</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>common</name>
    <description>河南循中网络科技有限公司 - 通用工具</description>

    <!-- 子模块打包类型必须为jar -->
    <packaging>jar</packaging>

    <!-- parent指明继承关系，给出被继承的父项目的具体信息 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <!-- 版本控制 -->
    <properties>
        <java.version>1.8</java.version>
        <!-- 实体类注解 -->
        <lombok.version>1.18.24</lombok.version>
        <!-- swagger -->
        <springfox-boot-starter.version>3.0.0</springfox-boot-starter.version>
        <!-- 腾讯云cos存储 -->
        <cos_api.version>5.6.89</cos_api.version>
        <!-- alibaba JSON -->
        <fastjson.version>2.0.11</fastjson.version>
        <!-- apache公共基础类 -->
        <commons-lang3.version>3.12.0</commons-lang3.version>
        <!-- 微信支付 -->
        <wechatpay-apache-httpclient.version>0.4.8</wechatpay-apache-httpclient.version>
        <!-- Hutool小而全的Java工具类库 -->
        <hutool-all.version>5.8.5</hutool-all.version>
    </properties>

    <!-- 引入的jar包 -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 实体类注解 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>

        <!-- swagger -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-boot-starter</artifactId>
            <version>${springfox-boot-starter.version}</version>
        </dependency>

        <!-- spring boot内置redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!-- 腾讯云cos存储 -->
        <dependency>
            <groupId>com.qcloud</groupId>
            <artifactId>cos_api</artifactId>
            <version>${cos_api.version}</version>
        </dependency>

        <!-- alibaba JSON -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>

        <!-- apache公共基础类 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3.version}</version>
        </dependency>

        <!-- 微信支付 -->
        <dependency>
            <groupId>com.github.wechatpay-apiv3</groupId>
            <artifactId>wechatpay-apache-httpclient</artifactId>
            <version>${wechatpay-apache-httpclient.version}</version>
        </dependency>

        <!-- Hutool小而全的Java工具类库 -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>${hutool-all.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

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yaml配置

weChatPay:
  # 支付回调地址
  notifyUrl: 支付回调地址
  # 退款回调地址
  refundNotifyUrl: 退款回调地址
  # 商户号
  mchId: 商户号
  # 公众号appId
  appid: 公众号appId
  # 公众号secret
  secret: 公众号secret
  # APIv3密钥
  apiV3Key: API v3密钥
  # 小程序appId
  miniProgramAppid: 小程序appId
  # 小程序secret
  miniProgramSecret: 小程序secret
  # 商户证书-apiclient_cert.p12路径
  apiclientCertp12: 商户证书-apiclient_cert.p12路径
  # 商户证书公钥-apiclient_cert.pem路径
  apiclientCert: 商户证书公钥-apiclient_cert.pem路径
  # 商户证书私钥-apiclient_key.pem路径
  apiclientKey: 商户证书私钥-apiclient_key.pem路径
  # 微信支付平台证书，有效期五年，xxxx年xx月份之前进行替换
  wechatPayCert: 微信支付平台证书，有效期五年，xxxx年xx月份之前进行替换
  # 商户证书序列号
  wechatPaySerial: 商户证书序列号
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创建WeChatPayUtil工具类

package com.xz.weChat;

import cn.hutool.core.io.resource.ClassPathResource;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.auth.PrivateKeySigner;
import com.wechat.pay.contrib.apache.httpclient.auth.Verifier;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials;
import com.wechat.pay.contrib.apache.httpclient.cert.CertificatesManager;
import com.wechat.pay.contrib.apache.httpclient.notification.Notification;
import com.wechat.pay.contrib.apache.httpclient.notification.NotificationHandler;
import com.wechat.pay.contrib.apache.httpclient.notification.NotificationRequest;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import com.xz.redis.RedisUtil;
import com.xz.util.NumberUtil;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;

import static org.apache.http.HttpHeaders.ACCEPT;
import static org.apache.http.HttpHeaders.CONTENT_TYPE;
import static org.apache.http.entity.ContentType.APPLICATION_JSON;

/**
 * 微信V3工具类
 */
@Component
public class WeChatPayUtil {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Value("${weChatPay.notifyUrl}")
    private String notifyUrl;
    @Value("${weChatPay.refundNotifyUrl}")
    private String refundNotifyUrl;
    @Value("${weChatPay.mchId}")
    private String mchId;
    @Value("${weChatPay.apiV3Key}")
    private String apiV3Key;
    @Value("${weChatPay.miniProgramAppid}")
    private String miniProgramAppid;
    @Value("${weChatPay.miniProgramSecret}")
    private String miniProgramSecret;
    @Value("${weChatPay.apiclientKey}")
    private String apiclientKey;
    @Value("${weChatPay.wechatPayCert}")
    private String wechatPayCert;
    @Value("${weChatPay.wechatPaySerial}")
    private String wechatPaySerial;

    @Resource
    private RedisUtil redisUtil;

    /**
     * 普通get请求
     * @param url
     * @return
     */
    public String doGet(String url){
        BufferedReader read = null;
        try {
            URL URL = new URL(url);
            read = new BufferedReader(new InputStreamReader(URL.openStream(),"utf-8"));
            StringBuffer str = new StringBuffer();
            String buf = "";
            buf = read.readLine();
            while (buf != null && !buf.equals("")) {
                str.append(buf);
                buf = read.readLine();
            }
            return str.toString();
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            try{
                if(read!=null) read.close();
            } catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return null;
    }

    /**
     * 普通post请求
     * @param url
     * @param param
     * @return
     * @throws Exception
     */
    public String doPost(String url, String param)throws Exception {
        PrintWriter out = null;
        BufferedReader read = null;
        String result = "";
        try {
            URL URL = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)URL.openConnection();
            conn.setRequestProperty("Accept","application/json");
            conn.setRequestProperty("Content-type","application/json");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);// 忽略缓存
            conn.setRequestMethod("POST");
            conn.setConnectTimeout(20000);
            conn.setReadTimeout(300000);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            // 获得响应状态
            int responseCode = conn.getResponseCode();
            if (HttpURLConnection.HTTP_OK == responseCode) {// 连接成功
                read = new BufferedReader(
                        new InputStreamReader(conn.getInputStream()));
                String line;
                while ((line = read.readLine()) != null) {
                    result += line;
                }
            }else{
                throw new Exception("请求链接失败");
            }
        } catch (IOException e) {
            throw e;
        } finally{
            try{
                if(out!=null) out.close();
                if(read!=null) read.close();
            } catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 微信v3 post请求
     * @param url
     * @param body
     * @return
     * @throws Exception
     */
    public String v3Post(String url,String body) throws Exception {
        logger.info("微信v3 post请求参数:" + body);
        CloseableHttpClient httpClient = getClient();
        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader(ACCEPT, APPLICATION_JSON.toString());
        httpPost.addHeader(CONTENT_TYPE, APPLICATION_JSON.toString());
        httpPost.addHeader("Wechatpay-Serial", wechatPaySerial);
        httpPost.setEntity(new StringEntity(body, "UTF-8"));
        CloseableHttpResponse response = httpClient.execute(httpPost);
        try {
            String bodyAsString = EntityUtils.toString(response.getEntity());
            logger.info("微信v3 post请求返回信息："+bodyAsString);
            return bodyAsString;
        } finally {
            httpClient.close();
            response.close();
        }
    }

    /**
     * 微信v3 get请求
     * @param url
     * @return
     * @throws Exception
     */
    public String v3Get(String url) throws Exception {
        logger.info("微信v3 get请求URL:" + url);
        CloseableHttpClient httpClient = getClient();
        HttpGet httpGet = new HttpGet(url);
        httpGet.addHeader(ACCEPT, APPLICATION_JSON.toString());
        httpGet.addHeader(CONTENT_TYPE, APPLICATION_JSON.toString());
        httpGet.addHeader("Wechatpay-Serial", wechatPaySerial);
        CloseableHttpResponse response = httpClient.execute(httpGet);
        try {
            String bodyAsString = EntityUtils.toString(response.getEntity());
            logger.info("微信v3 get请求返回信息："+bodyAsString);
            return bodyAsString;
        } finally {
            httpClient.close();
            response.close();
        }
    }

    /**
     * 小程序快捷登录
     * @param jsCode
     * @return
     * @throws Exception
     */
    public String miniJscode2session(String jsCode) throws Exception {
        String url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + miniProgramAppid + "&secret=" + miniProgramSecret + "&js_code=" + jsCode + "&grant_type=authorization_code";
        return doGet(url);
    }

    /**
     * 小程序获取手机号
     * @param code
     * @return
     * @throws Exception
     */
    public JSONObject miniGetuserphonenumber(String code) throws Exception {
        String accessToken = getAccessTokenMini();
        String Url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token="+accessToken;
        String getPhoneNumber = doPost(Url,"{\"code\": \""+code+"\"}");
        JSONObject getPhoneNumberJSON = JSON.parseObject(getPhoneNumber);
        return getPhoneNumberJSON;
    }

    /**
     * 微信通讯client
     * @return CloseableHttpClient
     */
    public CloseableHttpClient getClient() {
        /**商户证书私钥文件*/
        ClassPathResource apiclientKeyFile = new ClassPathResource(apiclientKey);
        InputStream apiclientKeyInputStream = apiclientKeyFile.getStream();

        /**微信支付平台证书文件*/
        ClassPathResource wechatPayCertFile = new ClassPathResource(wechatPayCert);
        InputStream wechatPayCertInputStream = wechatPayCertFile.getStream();

        PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(apiclientKeyInputStream);
        WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
                .withMerchant(mchId, wechatPaySerial, merchantPrivateKey)
                .withWechatPay(Arrays.asList(PemUtil.loadCertificate(wechatPayCertInputStream)));
        CloseableHttpClient httpClient = builder.build();
        return httpClient;
    }

    /**
     * 微信敏感数据加密公钥
     * 使用方法：
     * X509Certificate x509Certificate = getSaveCertificates();
     * RsaCryptoUtil.encryptOAEP(要加密的数据, x509Certificate)
     * @return
     */
    public X509Certificate getSaveCertificates() {
        ClassPathResource wechatPayCertFile = new ClassPathResource(wechatPayCert);
        InputStream platformCertInputStream = wechatPayCertFile.getStream();
        return PemUtil.loadCertificate(platformCertInputStream);
    }

    /**
     * 转换为分数，money小数长度不允许超过2位，如果超过2位小数，自动直接舍弃
     * @param money
     * @return
     */
    public int conversionFraction(BigDecimal money){
        int fractionMonery = 0;
        if(money!=null){
            fractionMonery = money.multiply(new BigDecimal(100)).intValue();
        }
        return fractionMonery;
    }

    /**
     * 获取时间戳
     * @return
     */
    private String getTimeStamp() {
        return String.valueOf(System.currentTimeMillis() / 1000);
    }

    /**
     * 生成签名
     * @param message
     * @return
     * @throws Exception
     */
    public String sign(byte[] message) throws Exception {
        Signature sign = Signature.getInstance("SHA256withRSA");
        // 商户证书私钥
        sign.initSign(getPrivateKey());
        sign.update(message);
        return Base64.getEncoder().encodeToString(sign.sign());
    }

    /**
     * 获取商户证书私钥
     * @return 私钥对象
     */
    public PrivateKey getPrivateKey() throws IOException {
        ClassPathResource apiclientKeyFile = new ClassPathResource(apiclientKey);
        PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(apiclientKeyFile.getStream());
        return merchantPrivateKey;
    }

    /**
     * 构造签名串
     * @param signMessage 待签名的参数
     * @return 构造后带待签名串
     */
    public String buildSignMessage(ArrayList<String> signMessage) {
        if (signMessage == null || signMessage.size() <= 0) {
            return null;
        }
        StringBuilder sbf = new StringBuilder();
        for (String str : signMessage) {
            sbf.append(str).append("\n");
        }
        return sbf.toString();
    }

    /**
     * 获取微信回调结果
     * @param request
     * @return
     * @throws Exception
     */
    public JSONObject getCallback(HttpServletRequest request) throws Exception {
        //获取报文
        String body = getRequestBody(request);
        //随机串
        String nonce = request.getHeader("Wechatpay-Nonce");
        //微信传递过来的签名
        String signature = request.getHeader("Wechatpay-Signature");
        //证书序列号（微信平台）
        String wechatPaySerial = request.getHeader("Wechatpay-Serial");
        //时间戳
        String timestamp = request.getHeader("Wechatpay-Timestamp");
        // 验签
        NotificationRequest notificationRequest = new NotificationRequest.Builder()
                .withSerialNumber(wechatPaySerial)
                .withNonce(nonce)
                .withTimestamp(timestamp)
                .withSignature(signature)
                .withBody(body)
                .build();
        NotificationHandler handler = new NotificationHandler(verifier(), apiV3Key.getBytes(StandardCharsets.UTF_8));
        // 验签和解析请求体
        Notification notification = handler.parse(notificationRequest);
        return JSON.parseObject(notification.getDecryptData());
    }

    /**
     * 获取报文
     * @param request
     * @return
     * @throws Exception
     */
    private String getRequestBody(HttpServletRequest request) throws Exception {
        StringBuffer stringBuffer = new StringBuffer();
        ServletInputStream inputStream = request.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String line;
        while ((line = reader.readLine()) != null) {
            stringBuffer.append(line);
        }
        return stringBuffer.toString();
    }

    /**
     * 获得验签器
     * @return
     * @throws Exception
     */
    public Verifier verifier() throws Exception {
        //获取证书管理器实例
        CertificatesManager certificatesManager = CertificatesManager.getInstance();
        certificatesManager.putMerchant(mchId, new WechatPay2Credentials(mchId,new PrivateKeySigner(wechatPaySerial, getPrivateKey())), apiV3Key.getBytes(StandardCharsets.UTF_8));
        // 从证书管理器中获取verifier
        Verifier verifier = certificatesManager.getVerifier(mchId);
        return verifier;
    }

    /**
     * JSAPI下单
     * @param appid 对应openid的应用ID
     * @param description 商品描述
     * @param orderNum 商户订单号
     * @param total 总金额
     * @param openid 个人用户openId
     * @throws Exception
     */
    public String transactionsJsapi(String appid, String description, String orderNum, BigDecimal total, String openid) throws Exception {
        JSONObject transactionsJsapiJSON = new JSONObject();
        transactionsJsapiJSON.put("appid", appid);
        transactionsJsapiJSON.put("mchid", mchId);
        transactionsJsapiJSON.put("description", description);
        transactionsJsapiJSON.put("out_trade_no", orderNum);
        transactionsJsapiJSON.put("notify_url",notifyUrl);
        JSONObject amount = new JSONObject();
        amount.put("total",conversionFraction(total));
        amount.put("currency","CNY");
        transactionsJsapiJSON.put("amount",amount);
        JSONObject payer = new JSONObject();
        payer.put("openid",openid);
        transactionsJsapiJSON.put("payer",payer);
        String body = transactionsJsapiJSON.toJSONString();
        return v3Post("https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi",body);
    }

    /**
     * 小程序支付
     * @param orderNum 商户订单号
     * @param total 总金额
     * @param openid 个人用户openId
     * @throws Exception
     */
    public JSONObject payMini(String orderNum,BigDecimal total,String openid) throws Exception {
        String transactionsJsapiBody = transactionsJsapi(miniProgramAppid,"么丢",orderNum,total,openid);
        JSONObject transactionsJsapiBodyJSON = JSON.parseObject(transactionsJsapiBody);
        String prepayId = transactionsJsapiBodyJSON.getString("prepay_id");
        if(StringUtils.isNotBlank(prepayId)){
            String timeStamp = getTimeStamp();
            String nonceStr = RandomStringUtils.randomNumeric(32);
            ArrayList<String> list = new ArrayList<>();
            list.add(miniProgramAppid);
            list.add(timeStamp);
            list.add(nonceStr);
            list.add("prepay_id=" + prepayId);
            //二次签名,调起支付需要重新签名,注意这个是buildSignMessage()
            String packageSign = sign(buildSignMessage(list).getBytes());
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("timeStamp", timeStamp);
            jsonObject.put("nonceStr", nonceStr);
            jsonObject.put("package", "prepay_id=" + prepayId);
            jsonObject.put("signType", "RSA");
            jsonObject.put("paySign", packageSign);
            return jsonObject;
        }else{
            return transactionsJsapiBodyJSON;
        }
    }

    /**
     * 申请退款
     * @param transactionId 微信支付订单号
     * @param outRefundNo 商户退款单号
     * @param refund 退款金额
     * @param total 原订单金额
     * @return
     * @throws Exception
     */
    public String domesticRefunds(String transactionId,String outRefundNo,BigDecimal refund,BigDecimal total) throws Exception {
        JSONObject domesticRefundsJSON = new JSONObject();
        domesticRefundsJSON.put("transaction_id", transactionId);
        domesticRefundsJSON.put("out_refund_no", outRefundNo);
        JSONObject amount = new JSONObject();
        amount.put("refund",conversionFraction(refund));
        amount.put("total",conversionFraction(total));
        amount.put("currency","CNY");
        domesticRefundsJSON.put("amount",amount);
        domesticRefundsJSON.put("notify_url", refundNotifyUrl);
        String body = domesticRefundsJSON.toJSONString();
        String domesticRefundsBody = v3Post("https://api.mch.weixin.qq.com/v3/refund/domestic/refunds",body);
        JSONObject domesticRefundsBodyJSON = JSON.parseObject(domesticRefundsBody);
        if(StringUtils.isNotBlank(domesticRefundsBodyJSON.getString("status")) && (domesticRefundsBodyJSON.getString("status").equals("SUCCESS") || domesticRefundsBodyJSON.getString("status").equals("PROCESSING"))){
            return "200";
        }else{
            return "code="+domesticRefundsBodyJSON.getString("code")+"，message="+domesticRefundsBodyJSON.getString("message");
        }
    }

    /**
     * 发起商家转账
     * @param appid 对应openid的应用ID
     * @param outBatchNo 转账单号
     * @param batchName 转账的名称
     * @param batchRemark 转账说明
     * @param totalAmount 转账金额
     * @param openid 个人用户openId
     * @return
     * @throws Exception
     */
    public String transferBatches(String appid,String outBatchNo,String batchName,String batchRemark,BigDecimal totalAmount,String openid) throws Exception {
        JSONObject transactionsJsapiJSON = new JSONObject();
        transactionsJsapiJSON.put("appid", appid);
        transactionsJsapiJSON.put("out_batch_no", outBatchNo);
        transactionsJsapiJSON.put("batch_name", batchName);
        transactionsJsapiJSON.put("batch_remark", batchRemark);
        transactionsJsapiJSON.put("total_amount", NumberUtil.conversionFraction(totalAmount));
        transactionsJsapiJSON.put("total_num", 1);
        JSONArray transferDetailList = new JSONArray();
        JSONObject transferDetail = new JSONObject();
        transferDetail.put("out_detail_no", outBatchNo);
        transferDetail.put("transfer_amount", NumberUtil.conversionFraction(totalAmount));
        transferDetail.put("transfer_remark", batchRemark);
        transferDetail.put("openid", openid);
        transferDetailList.add(transferDetail);
        transactionsJsapiJSON.put("transfer_detail_list", transferDetailList);
        String body = transactionsJsapiJSON.toJSONString();
        return v3Post("https://api.mch.weixin.qq.com/v3/transfer/batches",body);
    }

    /**
     * 小程序发起商家转账
     * @param outBatchNo 转账单号
     * @param batchName 转账的名称
     * @param batchRemark 转账说明
     * @param totalAmount 转账金额
     * @param openid 个人用户openId
     * @return
     * @throws Exception
     */
    public String miniTransferBatches(String outBatchNo,String batchName,String batchRemark,BigDecimal totalAmount,String openid) throws Exception {
        String transferBatchesStr = transferBatches(miniProgramAppid,outBatchNo,batchName,batchRemark,totalAmount,openid);
        JSONObject transferBatchesJSON = JSON.parseObject(transferBatchesStr);
        if(StringUtils.isNotBlank(transferBatchesJSON.getString("out_batch_no")) && StringUtils.isNotBlank(transferBatchesJSON.getString("batch_id")) && StringUtils.isNotBlank(transferBatchesJSON.getString("create_time"))){
            return "200";
        }else{
            return transferBatchesStr;
        }
    }

    /**
     * 获取基础access_token
     * @param appid 对应openid的应用ID
     * @param secret 对应openid的secret
     * @return
     * @throws Exception
     */
    public JSONObject getAccessToken(String appid,String secret) throws Exception {
        // 获取accres_token
        String Url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret;
        String doGet = doGet(Url);
        // 结果转为json对象
        if(StringUtils.isNotBlank(doGet)){
            JSONObject json = JSONObject.parseObject(doGet);
            if(json!=null){
                return json;
            }else{
                return null;
            }
        }else{
            return null;
        }
    }

    /**
     * 获取小程序基础access_token
     * @return
     * @throws Exception
     */
    public String getAccessTokenMini() throws Exception {
        String accessToken = null;
        if(redisUtil.get("accessToken")!=null){
            accessToken = redisUtil.get("accessToken").toString();
        }
        if(StringUtils.isBlank(accessToken)){
            JSONObject accessTokenJSON = getAccessToken(miniProgramAppid,miniProgramSecret);
            if(StringUtils.isBlank(accessTokenJSON.getString("errcode"))){
                accessToken = accessTokenJSON.getString("access_token");
                redisUtil.set("accessToken",accessToken);
                int expires_in = accessTokenJSON.getInteger("expires_in")-120;//基础token的时间减去2分钟
                redisUtil.expire("accessToken",expires_in);//将基础token存入redis
                return accessToken;
            }else{
                logger.info(accessTokenJSON.getString("errmsg"));
                return null;
            }
        }else{
            return accessToken;
        }
    }

    /**
     * 检测内容安全方法
     * 文档：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/sec-check/security.msgSecCheck.html
     * @param openid 用户的openid（用户需在近两小时访问过小程序）
     * @param scene 场景枚举值（1 资料；2 评论；3 论坛；4 社交日志）
     * @param content 需检测的文本内容，文本字数的上限为2500字，需使用UTF-8编码
     * @param accessToken 接口调用凭证
     * @return
     */
    public String msgSecCheck(String openid,Integer scene,String content, String accessToken) throws Exception {
        JSONObject msgSecCheckJSON = new JSONObject();
        msgSecCheckJSON.put("version", "2");
        msgSecCheckJSON.put("openid", openid);
        msgSecCheckJSON.put("scene", scene);
        msgSecCheckJSON.put("content", content);
        return v3Post("https://api.weixin.qq.com/wxa/msg_sec_check?access_token="+accessToken, msgSecCheckJSON.toJSONString());
    }

    /**
     * 小程序检测内容安全方法
     * 文档：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/sec-check/security.msgSecCheck.html
     * @param openid 用户的openid（用户需在近两小时访问过小程序）
     * @param scene 场景枚举值（1 资料；2 评论；3 论坛；4 社交日志）
     * @param content 需检测的文本内容，文本字数的上限为2500字，需使用UTF-8编码
     * @return
     */
    public JSONObject msgSecCheckMini(String openid,Integer scene,String content) throws Exception {
        JSONObject data = new JSONObject();
        String returnData = msgSecCheck(openid, scene, content, getAccessTokenMini());
        JSONObject returnDataJSON = JSON.parseObject(returnData);
        if(returnDataJSON!=null && returnDataJSON.getString("errcode").equals("0")){
            JSONObject resultJSON = returnDataJSON.getJSONObject("result");
            if(resultJSON!=null && resultJSON.getString("suggest").equals("pass")){
                data.put("code", 200);
                data.put("msg", "正常");
                return data;
            }else{
                data.put("code", 400);
                switch (resultJSON.getString("label")){
                    case "100":
                        data.put("msg", "正常");
                        break;
                    case "10001":
                        data.put("msg", "广告");
                        break;
                    case "20001":
                        data.put("msg", "时政");
                        break;
                    case "20002":
                        data.put("msg", "色情");
                        break;
                    case "20003":
                        data.put("msg", "辱骂");
                        break;
                    case "20006":
                        data.put("msg", "违法犯罪");
                        break;
                    case "20008":
                        data.put("msg", "欺诈");
                        break;
                    case "20012":
                        data.put("msg", "低俗");
                        break;
                    case "20013":
                        data.put("msg", "版权");
                        break;
                    case "21000":
                        data.put("msg", "其他");
                        break;
                    default:
                        data.put("msg", "其他");
                        break;
                }
                return data;
            }
        }else{
            data.put("code", 400);
            data.put("msg", "接口请求异常"+returnDataJSON.toJSONString());
            return data;
        }
    }
}

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创建WeChatPayController微信回调类

package com.xz.controller.pay;

import com.alibaba.fastjson.JSONObject;
import com.xz.weChat.WeChatPayUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 微信支付回调
 */
@RestController
public class WeChatPayController {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Resource
    private WeChatPayUtil weChatPayUtil;


    /**
     * v3处理微信支付异步回调
     * @param request
     * @param response
     */
    @RequestMapping("/clientWeChatNotify")
    public void clientWeChatNotify(HttpServletRequest request, HttpServletResponse response) throws Exception {
        try{
            //获取微信回调结果
            JSONObject dataJSON = weChatPayUtil.getCallback(request);
            logger.info("v3处理微信支付异步回调=============================================================="+dataJSON);
            String out_trade_no = dataJSON.getString("out_trade_no");//商户平台订单号
            String transaction_id = dataJSON.getString("transaction_id");//微信支付交易号
            //处理业务逻辑
            
            //返回给微信
            response.setStatus(200);
        }catch (Exception e){
            e.printStackTrace();
            logger.error("v3处理微信支付异步回调：错误-"+e.getMessage());
        }
    }

    /**
     * v3处理微信退款异步回调
     * @param request
     * @param response
     */
    @RequestMapping("/refundWeChatNotify")
    public void refundWeChatNotify(HttpServletRequest request, HttpServletResponse response) throws Exception {
        try{
            //获取微信回调结果
            JSONObject dataJSON = weChatPayUtil.getCallback(request);
            logger.info("v3处理微信退款异步回调=============================================================="+dataJSON);
            String outRefundNo = dataJSON.getString("out_refund_no");//商户退款单号
            String refundStatus = dataJSON.getString("refund_status");//退款状态，枚举值：SUCCESS：退款成功、CLOSED：退款关闭、ABNORMAL：退款异常，退款到银行发现用户的卡作废或者冻结了，导致原路退款银行卡失败，可前往【商户平台—>交易中心】，手动处理此笔退款
            //处理业务逻辑
            
            //返回给微信
            response.setStatus(200);
        }catch (Exception e){
            e.printStackTrace();
            logger.error("v3处理微信退款异步回调：错误-"+e.getMessage());
        }
    }
}

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