微信支付 & 退款 - 快速入门（第三方SDK）

	cn.springboot
	best-pay-sdk
	1.1.0



    org.springframework.boot
    spring-boot-starter-freemarker

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 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 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 目录结构

// create

// success


    
    

 

附

• 微信一旦成功发起了支付，这时，你在数据库改价格，发现再一次调用接口，还是原先未改的价格。这是因为一旦成功发起，微信服务器就会记录该订单信息，所以需要重新修改订单号等相关信息。 

• 订单状态业务处理后需要返回给微信处理结果，否则微信会定时调用异步回调方法。

• 模板引擎：Freemarker，之所以要用这个，没有前后端分离，是因为前端可能反复需要写这么一段JSSDK，当然前端也可以去封装，这里只不过也可以在后端封装中间这个过程。