springboot微信扫码登录

说明：调用商户Native支付下单接口，微信后台系统返回链接参数code_url，在页面将code_url值生成二维码图片，用户使用微信客户端扫码后发起支付（无需配置白名单）

1、统一下单

public Result unifiedOrderNATIVE(Map<String,Object> orderMap, HttpServletRequest request) {
        Map<String, String> returnMap = new HashMap<>();
        String orderNo = null;
        try {
            //如果订单不为空
            if (orderMap != null){
                orderNo = orderMap.get("id").toString();
                Double amount = Double.parseDouble(orderMap.get("sfprice").toString());

                JSONObject payObj = new JSONObject();
                payObj.put("mchid",payConfig.getMchId());
                payObj.put("out_trade_no",orderNo);
                payObj.put("appid",payConfig.getWxPayAppid());
                payObj.put("description","订单支付");
                payObj.put("notify_url",payConfig.getCallbackUrl());
                //订单总金额，单位为分。
                JSONObject amountObj = new JSONObject();
                amountObj.put("total",(int) (amount * 100));
                amountObj.put("currency","CNY");
                payObj.put("amount",amountObj);
                JSONObject res = wechatPayV3Utils.sendPost("https://api.mch.weixin.qq.com/v3/pay/transactions/native", payObj); //发起请求
                if (res == null || StringUtils.isEmpty(res.getString("code_url"))) {
                    //@TODO 支付发起失败可以将订单数据回滚
                    return ResultUtil.error("获取预支付交易会话标识失败"+res);
                }
                returnMap.put("code_url",res.get("code_url").toString());
            }
            return ResultUtil.success(returnMap);
        } catch (Exception e) {
            logger.error("订单号：{}，错误信息：{}", orderNo, e.getStackTrace());
            return ResultUtil.error("微信支付统一下单失败");
        }
    }

2、支付页面

<script>
    var userId = "${userId}";
    var baseUrl = function (n) {
        return 'https://test.com/pay' + n
    }
    //支付方法
    function pay(id,price){
        url = baseUrl('/unifiedOrderNATIVE');
        data = {id: id,userId:userId}
        $.ajax({
            url: url,
            type: "post",
            dataType: "json",
            contentType: "application/json;charset=utf-8",
            data: JSON.stringify(data),
            success: function (res) {
                if (res.code == 0) {
                    var code_url = res.data.code_url;
                    var qrcodeUrl = qrcode(4, 'L');
                    qrcodeUrl.addData(code_url);
                    qrcodeUrl.make()
                    document.getElementById('qrcodes').innerHTML =             
                    qrcodeUrl.createImgTag();
                }else{
                    alert(res.msg);
                }
            }
        })
    }
</script>