前言

微信支付适用于许多场合，如小程序、网页支付、但微信支付相对于其他支付方式略显麻烦，我们使用IJpay框架进行整合

一、IJpay是什么？

JPay 让支付触手可及，封装了微信支付、支付宝支付、银联支付常用的支付方式以及各种常用的接口。不依赖任何第三方 mvc 框架，仅仅作为工具使用简单快速完成支付模块的开发，可轻松嵌入到任何系统里。

二、使用步骤

1.准备小程序必要信息

1.1 要在小程序端关联商户号

1.2在application.yml文件中配置相关信息

这是微信平台下载的证书

1.3导入IJpay依赖

    
            com.github.javen205
            IJPay-WxPay
            2.9.6
        

2.具体操作

2.1新建控制器WxPayApiContoller

2.2控制器代码：

package cn.cnvp.web.api.wechart;
import cn.cnvp.web.token.message.JsonResult;
import cn.cnvp.web.utils.WxUtils;
import cn.hutool.core.date.DatePattern;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.file.FileWriter;
import cn.hutool.core.util.StrUtil;
import cn.hutool.http.ContentType;
import cn.hutool.http.HttpStatus;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.ijpay.core.IJPayHttpResponse;
import com.ijpay.core.enums.RequestMethodEnum;
import com.ijpay.core.kit.AesUtil;
import com.ijpay.core.kit.HttpKit;
import com.ijpay.core.kit.PayKit;
import com.ijpay.core.kit.WxPayKit;
import com.ijpay.core.utils.DateTimeZoneUtil;
import com.ijpay.wxpay.WxPayApi;
import com.ijpay.wxpay.enums.WxDomainEnum;
import com.ijpay.wxpay.enums.v3.BasePayApiEnum;
import com.ijpay.wxpay.enums.v3.OtherApiEnum;
import com.ijpay.wxpay.model.v3.Amount;
import com.ijpay.wxpay.model.v3.Payer;
import com.ijpay.wxpay.model.v3.UnifiedOrderModel;
import io.swagger.annotations.Api;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Scope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Map;
/**
 * @Author: Scoot
 * @Date: 2023/3/16 15:52
 * @Description: 微信支付控制器
 */
@Slf4j
@Api(tags = "微信支付控制器")
@RestController
@RequestMapping("/api/wx/pay/v1")
@Scope("prototype")
public class WxPayApiController {
    /**微信小程序appid**/
    @Value("${wechat.ma.appId}")
    String appid;
    /**微信小程序secretId**/
    @Value("${wechat.ma.secret}")
    String secret;
    /**商户号**/
    @Value("${wechat.ma.mchid}")
    String mchid;
    /**商户密钥**/
    @Value("${wechat.ma.mchKey}")
    String mchKey;
    /**回调地址**/
    @Value("${wechat.ma.notifyUrl}")
    String notifyUrl;
    /**证书地址**/
    @Value("${wechat.ma.certPath}")
    String certPath;
    /**证书密钥地址**/
    @Value("${wechat.ma.certKeyPath}")
    String certKeyPath;
    /**微信平台证书**/
    @Value("${wechat.ma.platFormPath}")
    String platFormPath;
    /**
     * 微信支付
     * @param openId  用户openId
     * @return
     */
    @RequestMapping("/jsApiPay")
    @ResponseBody
    public JsonResult jsApiPay(@RequestParam(value = "openId", required = false, defaultValue = "o-_-itxuXeGW3O1cxJ7FXNmq8Wf8") String openId) {
        try {
            String timeExpire = DateTimeZoneUtil.dateToTimeZone(System.currentTimeMillis() + 1000 * 60 * 3);
            UnifiedOrderModel unifiedOrderModel = new UnifiedOrderModel()
                    // APPID
                    .setAppid(appid)
                    // 商户号
                    .setMchid(mchid)
                    .setDescription("IJPay 让支付触手可及")
                    .setOut_trade_no(PayKit.generateStr())
                    .setTime_expire(timeExpire)
                    .setAttach("微信系开发脚手架 https://gitee.com/javen205/TNWX")
                    .setNotify_url(notifyUrl)
                    .setAmount(new Amount().setTotal(1))
                    .setPayer(new Payer().setOpenid(openId));
            log.info("统一下单参数 {}", JSONUtil.toJsonStr(unifiedOrderModel));
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethodEnum.POST,
                    WxDomainEnum.CHINA.toString(),
                    BasePayApiEnum.JS_API_PAY.toString(),
                    mchid,
                    getSerialNumber(),
                    null,
                    certKeyPath,
                    JSONUtil.toJsonStr(unifiedOrderModel)
            );
            log.info("统一下单响应 {}", response);
            // 根据证书序列号查询对应的证书来验证签名结果
            boolean verifySignature = WxPayKit.verifySignature(response, platFormPath);
            log.info("verifySignature: {}", verifySignature);
            if (response.getStatus() == HttpStatus.HTTP_OK && verifySignature) {
                String body = response.getBody();
                JSONObject jsonObject = JSONUtil.parseObj(body);
                String prepayId = jsonObject.getStr("prepay_id");
                Map map = WxPayKit.jsApiCreateSign(appid, prepayId, certKeyPath);
                log.info("唤起支付参数:{}", map);
                return JsonResult.success("获取成功",JSONUtil.toJsonStr(map));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return JsonResult.error("唤起失败");
    }
    /**
     * 微信支付回调
     * @param request
     * @param response
     */
    @RequestMapping(value = "/payNotify", method = {org.springframework.web.bind.annotation.RequestMethod.POST, org.springframework.web.bind.annotation.RequestMethod.GET})
    public void payNotify(HttpServletRequest request, HttpServletResponse response) {
        Map map = new HashMap<>(12);
        try {
            String timestamp = request.getHeader("Wechatpay-Timestamp");
            String nonce = request.getHeader("Wechatpay-Nonce");
            String serialNo = request.getHeader("Wechatpay-Serial");
            String signature = request.getHeader("Wechatpay-Signature");
            log.info("timestamp:{} nonce:{} serialNo:{} signature:{}", timestamp, nonce, serialNo, signature);
            String result = HttpKit.readData(request);
            log.info("支付通知密文 {}", result);
            // 需要通过证书序列号查找对应的证书，verifyNotify 中有验证证书的序列号
            String plainText = WxPayKit.verifyNotify(serialNo, result, signature, nonce, timestamp,
                    mchKey, platFormPath);
            log.info("支付通知明文 {}", plainText);
            if (StrUtil.isNotEmpty(plainText)) {
                response.setStatus(200);
                map.put("code", "SUCCESS");
                map.put("message", "SUCCESS");
            } else {
                response.setStatus(500);
                map.put("code", "ERROR");
                map.put("message", "签名错误");
            }
            response.setHeader("Content-type", ContentType.JSON.toString());
            response.getOutputStream().write(JSONUtil.toJsonStr(map).getBytes(StandardCharsets.UTF_8));
            response.flushBuffer();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private String getSerialNumber() {
        // 获取证书序列号
        X509Certificate certificate = PayKit.getCertificate(certPath);
        if (null != certificate) {
            String serialNo = certificate.getSerialNumber().toString(16).toUpperCase();
            // 提前两天检查证书是否有效
            boolean isValid = PayKit.checkCertificateIsValid(certificate, mchid, -2);
            log.info("证书是否可用 {} 证书有效期为 {}", isValid, DateUtil.format(certificate.getNotAfter(), DatePattern.NORM_DATETIME_PATTERN));
            System.out.println("serialNo:" + serialNo);
            return serialNo;
        }
        return null;
    }
    @RequestMapping("/get")
    @ResponseBody
    public String v3Get() {
        // 获取平台证书列表
        try {
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethodEnum.GET,
                    WxDomainEnum.CHINA.toString(),
                    OtherApiEnum.GET_CERTIFICATES.toString(),
                    mchid,
                    getSerialNumber(),
                    null,
                    certKeyPath,
                    ""
            );
            String serialNumber = response.getHeader("Wechatpay-Serial");
            String body = response.getBody();
            int status = response.getStatus();
            log.info("serialNumber: {}", serialNumber);
            log.info("status: {}", status);
            log.info("body: {}", body);
            int isOk = 200;
            if (status == isOk) {
                JSONObject jsonObject = JSONUtil.parseObj(body);
                JSONArray dataArray = jsonObject.getJSONArray("data");
                // 默认认为只有一个平台证书
                JSONObject encryptObject = dataArray.getJSONObject(0);
                JSONObject encryptCertificate = encryptObject.getJSONObject("encrypt_certificate");
                String associatedData = encryptCertificate.getStr("associated_data");
                String cipherText = encryptCertificate.getStr("ciphertext");
                String nonce = encryptCertificate.getStr("nonce");
                String serialNo = encryptObject.getStr("serial_no");
                final String platSerialNo = savePlatformCert(associatedData, nonce, cipherText, platFormPath);
                log.info("平台证书序列号: {} serialNo: {}", platSerialNo, serialNo);
            }
            // 根据证书序列号查询对应的证书来验证签名结果
            boolean verifySignature = WxPayKit.verifySignature(response, platFormPath);
            System.out.println("verifySignature:" + verifySignature);
            return body;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    /**
     * 保存平台证书
     * @param associatedData    associated_data
     * @param nonce             nonce
     * @param cipherText        cipherText
     * @param certPath          证书保存路径
     * @return
     */
    private String savePlatformCert(String associatedData, String nonce, String cipherText, String certPath) {
        try {
            AesUtil aesUtil = new AesUtil(mchKey.getBytes(StandardCharsets.UTF_8));
            // 平台证书密文解密
            // encrypt_certificate 中的  associated_data nonce  ciphertext
            String publicKey = aesUtil.decryptToString(
                    associatedData.getBytes(StandardCharsets.UTF_8),
                    nonce.getBytes(StandardCharsets.UTF_8),
                    cipherText
            );
            // 保存证书
            cn.hutool.core.io.file.FileWriter writer = new FileWriter(certPath);
            writer.write(publicKey);
            // 获取平台证书序列号
            X509Certificate certificate = PayKit.getCertificate(new ByteArrayInputStream(publicKey.getBytes()));
            return certificate.getSerialNumber().toString(16).toUpperCase();
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }
    }
}

2.3下载平台证书platForm.pem

调用上面get方法下载证书下载完成后会在yml配置的路径生成platForm.pem证书

2.4启动测试

接口传入openID(后续可换其他方式),返回如下json字符串表示成功

2.5小程序唤起微信支付

2.5.1uniapp代码

2.6异步回调

在yml配置的异步回调地址(需要外网访问)

总结

以上就是今天要讲的内容，本文仅仅简单介绍了springboot整合IJpay进行微信支付的使用，关于调用支付jspi缺少参数:total_fee主要是因为1.金额为空 2.订单号重复 3.订单号为空