JSAPI微信公众号apiV3文档支付

---

一.所需参数及maven依赖

官方文档
1.公众号id appid
2.商户号 mchid
3.APIv3秘钥 secret
4.商户api私钥 apiclient_key.pem
5.证书序列号

maven依赖

<!-- 微信支付V3版sdk -->
<dependency>
	<groupId>com.github.wechatpay-apiv3</groupId>
	<artifactId>wechatpay-apache-httpclient</artifactId>
	<version>0.2.1</version>
</dependency>

---

二.前端vue部分

// 确认支付
onSubmit() {
   
   
  // 手机端校验
  if (!navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
   
   
    this.$dialog.alert({
   
    message: '请在手机端微信关注公众号"跃迁赋能中心"进行购买' })
    return
  }

  // TODO 购买商品参数拼接、非空校验

  let that = this
  this.$api.request({
   
   
    url: '/wxpay/pay',
    method: 'post',
    params: params
  }).then(response => {
   
   
    // 拉起微信支付参数赋值
    that.payMap = response.data
    
    if (typeof WeixinJSBridge === 'undefined') {
   
   
      if (document.addEventListener) {
   
   
        document.addEventListener('WeixinJSBridgeReady', this.onBridgeReady, false)
      } else if (document.attachEvent) {
   
   
        document.attachEvent('WeixinJSBridgeReady', this.onBridgeReady)
        document.attachEvent('onWeixinJSBridgeReady', this.onBridgeReady)
      }
    } else {
   
   
      this.onBridgeReady()
    }
  })
},
// 拉起微信支付
onBridgeReady() {
   
   
  let payMap = this.payMap
  let that = this
  WeixinJSBridge.invoke(
    'getBrandWCPayRequest', {
   
   
      'appId': payMap.appId, // 公众号名称，由商户传入
      'timeStamp': payMap.timeStamp, // 时间戳，自1970年以来的秒数
      'nonceStr': payMap.nonceStr, // 随机串
      'package': payMap.package,
      'signType': payMap.signType, // 微信签名方式：
      'paySign': payMap.paySign // 微信签名
    },
    function(res) {
   
   
      if (res.err_msg == 'get_brand_wcpay_request:ok') {
   
   
        // 付款成功处理
        that.$router.replace({
   
    path: '/' })
      }
    })
},

三.后端java部分

3.1 获取前端拉起微信支付参数
Controller

@ApiOperation("微信公众号支付")
@PostMapping("/pay")
public AjaxResult pay(HttpServletRequest request, @RequestParam(required = false) String miniIdStr,
    @RequestParam Double payAmount, @RequestParam String couponIdStr,
    @RequestParam(required = false) Long courseId) {
   
   
    Long personId = tokenService.getPersonId(request);
    // TODO 购买课程参数校验

    try {
   
   
        JSONObject result = officeOrderService.wxPay(personId, miniIdStr, payAmount, couponIdStr, courseId);
        Integer status = result.getInteger("status");
        if (status != null && status == 0) {
   
   
        	// 支付失败不反回前端拉起微信支付参数
            return AjaxResult.error("支付失败，请稍后再试");
        }
        return AjaxResult.success(result);
    } catch (Exception e) {
   
   
        log.error("微信支付下单接口失败,personId:{},miniIdStr:{},payAmount:{},couponIdStr:{},courseId:{}", personId,
            miniIdStr, payAmount, couponIdStr, courseId, e);
        return AjaxResult.error("支付失败，请稍后再试");
    }
}

Service

@Override
public JSONObject wxPay(Long personId, String miniIdStr, Double payAmount, String couponIdStr, Long courseId) {
   
   
    // 根据personId获取公众号openId
    String openId = wxLoginMapper.selectOpenIdByPersonId(personId);

    // 生成商品订单号
    String orderNumber = UUID.