WeChat Payment & Refund-Quick Start (Third Party SDK)

<dependency>
	<groupId>cn.springboot</groupId>
	<artifactId>best-pay-sdk</artifactId>
	<version>1.1.0</version>
</dependency>

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

wechat:
  # 公众账号, 授权
  mpAppId: wxd898fcb01713c658
  mpAppSecret:

  # 开放平台,  卖家扫码登录用
  openAppId: wx6ad144e54af67d87
  openAppSecret: 91a2ff6d38a2bbccfb7e9xxxxxx

  # 支付/商户号
  mchId: 1483469312
  mchKey: 06C56A89949D617xxxxxxxxxxx
  # 发起支付不需要证书, 退款需要
  keyPath:
  notifyUrl: http://sell.natapp4.cc/sell/pay/notify
  templateId:
    orderStatus: e-Cqq67QxD6YNI41iRiqawEYdFavW_7pc7LyEMb-yeQ

package com.imooc.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Map;

@Data
@Component
@ConfigurationProperties(prefix = "wechat")
public class WechatAccountConfig {

    /**
     * 公众平台id
     */
    private String mpAppId;

    /**
     * 公众平台密钥
     */
    private String mpAppSecret;

    /**
     * 开放平台id
     */
    private String openAppId;

    /**
     * 开放平台密钥
     */
    private String openAppSecret;

    /**
     * 商户号
     */
    private String mchId;

    /**
     * 商户密钥
     */
    private String mchKey;

    /**
     * 商户证书路径
     */
    private String keyPath;

    /**
     * 微信支付异步通知地址
     */
    private String notifyUrl;

    /**
     * 微信模版id
     */
    private Map<String, String> templateId;
}

package com.imooc.config;

import com.lly835.bestpay.config.WxPayH5Config;
import com.lly835.bestpay.service.impl.BestPayServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Component
public class WechatPayConfig {

    @Autowired
    private WechatAccountConfig accountConfig;

    @Bean
    public BestPayServiceImpl bestPayService() {
        BestPayServiceImpl bestPayService = new BestPayServiceImpl();
        bestPayService.setWxPayH5Config(wxPayH5Config());
        return bestPayService;
    }

    @Bean
    public WxPayH5Config wxPayH5Config() {
        WxPayH5Config wxPayH5Config = new WxPayH5Config();
        wxPayH5Config.setAppId(accountConfig.getMpAppId());
        wxPayH5Config.setAppSecret(accountConfig.getMpAppSecret());
        wxPayH5Config.setMchId(accountConfig.getMchId());
        wxPayH5Config.setMchKey(accountConfig.getMchKey());
        wxPayH5Config.setKeyPath(accountConfig.getKeyPath());
        wxPayH5Config.setNotifyUrl(accountConfig.getNotifyUrl());
        return wxPayH5Config;
    }
}

package com.imooc.service;

import com.imooc.dto.OrderDTO;
import com.lly835.bestpay.model.PayResponse;
import com.lly835.bestpay.model.RefundResponse;

public interface PayService {

    PayResponse create(OrderDTO orderDTO);

    PayResponse notify(String notifyData);

    RefundResponse refund(OrderDTO orderDTO);
}

package com.imooc.service.impl;

import com.imooc.dto.OrderDTO;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.service.OrderService;
import com.imooc.service.PayService;
import com.imooc.utils.JsonUtil;
import com.imooc.utils.MathUtil;
import com.lly835.bestpay.enums.BestPayTypeEnum;
import com.lly835.bestpay.model.PayRequest;
import com.lly835.bestpay.model.PayResponse;
import com.lly835.bestpay.model.RefundRequest;
import com.lly835.bestpay.model.RefundResponse;
import com.lly835.bestpay.service.impl.BestPayServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
@Slf4j
public class PayServiceImpl implements PayService {

    private static final String ORDER_NAME = "微信点餐订单";

    @Autowired
    private BestPayServiceImpl bestPayService;

    @Autowired
    private OrderService orderService;

    @Override
    public PayResponse create(OrderDTO orderDTO) {
        PayRequest payRequest = new PayRequest();
        payRequest.setOpenid(orderDTO.getBuyerOpenid());
        payRequest.setOrderAmount(orderDTO.getOrderAmount().doubleValue());
        payRequest.setOrderId(orderDTO.getOrderId());
        payRequest.setOrderName(ORDER_NAME);
        payRequest.setPayTypeEnum(BestPayTypeEnum.WXPAY_H5);
        log.info("【微信支付】发起支付, request={}", JsonUtil.toJson(payRequest));

        PayResponse payResponse = bestPayService.pay(payRequest);
        log.info("【微信支付】发起支付, response={}", JsonUtil.toJson(payResponse));
        return payResponse;
    }

    @Override
    public PayResponse notify(String notifyData) {
        //1. 验证签名
        //2. 支付的状态
        //3. 支付金额
        //4. 支付人(下单人 == 支付人)

        // bestPayService.asyncNotify 已经验证了签名和支付状态
        PayResponse payResponse = bestPayService.asyncNotify(notifyData);
        log.info("【微信支付】异步通知, payResponse={}", JsonUtil.toJson(payResponse));

        //查询订单
        OrderDTO orderDTO = orderService.findOne(payResponse.getOrderId());

        //判断订单是否存在
        if (orderDTO == null) {
            log.error("【微信支付】异步通知, 订单不存在, orderId={}", payResponse.getOrderId());
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }

        //判断金额是否一致(0.10   0.1)
        if (!MathUtil.equals(payResponse.getOrderAmount(), orderDTO.getOrderAmount().doubleValue())) {
            log.error("【微信支付】异步通知, 订单金额不一致, orderId={}, 微信通知金额={}, 系统金额={}",
                    payResponse.getOrderId(),
                    payResponse.getOrderAmount(),
                    orderDTO.getOrderAmount());
            throw new SellException(ResultEnum.WXPAY_NOTIFY_MONEY_VERIFY_ERROR);
        }

        //修改订单的支付状态
        orderService.paid(orderDTO);

        return payResponse;
    }

    /**
     * 退款
     * @param orderDTO
     */
    @Override
    public RefundResponse refund(OrderDTO orderDTO) {
        RefundRequest refundRequest = new RefundRequest();
        refundRequest.setOrderId(orderDTO.getOrderId());
        refundRequest.setOrderAmount(orderDTO.getOrderAmount().doubleValue());
        refundRequest.setPayTypeEnum(BestPayTypeEnum.WXPAY_H5);
        log.info("【微信退款】request={}", JsonUtil.toJson(refundRequest));

        RefundResponse refundResponse = bestPayService.refund(refundRequest);
        log.info("【微信退款】response={}", JsonUtil.toJson(refundResponse));

        return refundResponse;
    }
}

package com.imooc.controller;

import com.imooc.dto.OrderDTO;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.service.OrderService;
import com.imooc.service.PayService;
import com.lly835.bestpay.model.PayResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
import java.util.Map;

@Controller
@RequestMapping("/pay")
public class PayController {

    @Autowired
    private OrderService orderService;

    @Autowired
    private PayService payService;

    @GetMapping("/create")
    public ModelAndView create(@RequestParam("orderId") String orderId,
                               @RequestParam("returnUrl") String returnUrl,
                               Map<String, Object> map) {
        //1. 查询订单
        OrderDTO orderDTO = orderService.findOne(orderId);
        if (orderDTO == null) {
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }

        //2. 发起支付
        PayResponse payResponse = payService.create(orderDTO);

        map.put("payResponse", payResponse);
        map.put("returnUrl", returnUrl);

        return new ModelAndView("pay/create", map);
    }

    /**
     * 微信异步通知
     * @param notifyData
     */
    @PostMapping("/notify")
    public ModelAndView notify(@RequestBody String notifyData) {
        payService.notify(notifyData);

        //返回给微信处理结果
        return new ModelAndView("pay/success");
    }
}

Freemarker directory structure

// create

<script>
    function onBridgeReady(){
        WeixinJSBridge.invoke(
                'getBrandWCPayRequest', {
                    "appId":"${payResponse.appId}",     //公众号名称，由商户传入
                    "timeStamp":"${payResponse.timeStamp}",         //时间戳，自1970年以来的秒数
                    "nonceStr":"${payResponse.nonceStr}", //随机串
                    "package":"${payResponse.packAge}",
                    "signType":"MD5",         //微信签名方式：
                    "paySign":"${payResponse.paySign}" //微信签名
                },
                function(res){
//                    if(res.err_msg == "get_brand_wcpay_request:ok" ) {

//                    }     // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回    ok，但并不保证它绝对可靠。
                    location.href = "${returnUrl}";
                }
        );
    }
    if (typeof WeixinJSBridge == "undefined"){
        if( document.addEventListener ){
            document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
        }else if (document.attachEvent){
            document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
            document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
        }
    }else{
        onBridgeReady();
    }
</script>

// success

<xml>
    <return_code><![CDATA[SUCCESS]]></return_code>
    <return_msg><![CDATA[OK]]></return_msg>
</xml>

 

Attached

• Once WeChat successfully initiated the payment, at this time, you change the price in the database and find that the price is still unchanged after calling the interface again. This is because once successfully initiated, the WeChat server will record the order information, so the order number and other related information need to be modified again. 

• The order status business needs to be returned to WeChat processing results, otherwise WeChat will periodically call the asynchronous callback method.

• Template engine: Freemarker. The reason for using this is that there is no separation between the front end and the back end, because the front end may repeatedly need to write such a JSSDK. Of course, the front end can also be encapsulated. Here, it can only be in the middle of the back end packaging process.