微信公眾號支付調用統一下單接口時，微信返回的數據一定要二次組裝再給前臺，否則會有問題的，正確示範如下：

/**
     * 獲取weixin支付的返回信息
     * @param payOrderId
     * @return
     */
    @Override
    public String getPayInfo(String payOrderId,String openid,String orderType) {
        //返回結果
        String res = "";
        double total_fee_money = 0;
        
 
//0代表普通車支付，1代表活動支付
        if ("0".equals(orderType)) {

            //payOrderId即訂單的id亦是訂單表的主鍵
            Order_main omm = orderMainService.fetch(payOrderId);
            if (omm == null) {
                res = "訂單不存在";
                return res;
            }
            //如果已支付狀態為1的話
            if (OrderPayStatusEnum.PAYALL.getKey() == omm.getPayStatus()) {
                res 
 
= "訂單已支付";
                return res;
            }
            total_fee_money = omm.getFrontMoney();
        } else {
            //clueId即Clue_main的id
            //update by zhangyi 2017-12-1
            ActivityPayRecord activityPayRecord = activitypayrecordService.fetch(payOrderId);
            if
 
 (activityPayRecord == null) {
                res = "活動定金支付記錄不存在";
                return res;
            }
            //如果已支付狀態為1的話
            if (1 == activityPayRecord.getPayStatus()) {
                res = "活動定金已支付";
                return res;
            }
            total_fee_money = activityPayRecord.getFrontMoney();
        }


//         double total_fee_money= 1;
        // 總金額以分為單位，不帶小數點
        // 格式轉換
        DecimalFormat dformat = new DecimalFormat("0");
        String totalFee = dformat.format(total_fee_money);

        if ("true".equals(config.get("isTest", ""))) {
            totalFee = "1";
        }
        // 把請求參數打包成數組
        HashMap<String, String> sParaTemp = new HashMap<String, String>();
        String body = "長城二手車";
        //訂單生成的機器 IP
        String exter_invoke_ip = this.localIp();
        sParaTemp.put("appid", WeixinConfig.appid);
        sParaTemp.put("mch_id", WeixinConfig.mch_id);
        sParaTemp.put("notify_url", WeixinConfig.notify_url);
        sParaTemp.put("trade_type", WeixinConfig.trade_type);
        sParaTemp.put("sign_type", WeixinConfig.sign_type);
        sParaTemp.put("openid", openid);
        String nonce_str = String.valueOf(new Date().getTime());
        sParaTemp.put("nonce_str", WXPayUtil.generateNonceStr());
        sParaTemp.put("spbill_create_ip", exter_invoke_ip);
        sParaTemp.put("out_trade_no", payOrderId);
        sParaTemp.put("total_fee", totalFee);
        sParaTemp.put("body", body);
        sParaTemp.put("timeStamp", nonce_str);
        //add by zhangyi 付款類型 0代表普通車支付，1代表活動支付
        sParaTemp.put("attach", orderType);

        try {
            sParaTemp.put("sign", WXPayUtil.generateSignature(sParaTemp, WeixinConfig.key, WeixinConfig.sign_type));

            String reqBody = WXPayUtil.mapToXml(sParaTemp);
            String resp = wXPayRequest.requestWithoutCert(WeixinConfig.req_url, nonce_str, reqBody, WeixinConfig.connectTimeoutMs, WeixinConfig.readTimeoutMs, true);

            //驗證簽名是否正確
            if (WXPayUtil.isSignatureValid(WXPayUtil.xmlToMap(resp), WeixinConfig.key, WeixinConfig.sign_type)) {
                //將返參轉為map
                Map<String, String> resultmap = WXPayUtil.xmlToMap(resp);
                //resultmap.put("timeStamp",nonce_str);
                //System.out.println(JSON.toJSONString(resultmap));
                //return JSON.toJSONString(resultmap);
                //return JSON.toJSONString(WXPayUtil.xmlToMap(resp).put("timeStamp",nonce_str));

                //二次簽名
                String paySign = WXPayUtil.MD5("appId=" + WeixinConfig.appid + "&nonceStr=" + resultmap.get("nonce_str") + "&package=prepay_id=" + resultmap.get("prepay_id") + "&signType=MD5&timeStamp=" + nonce_str + "&key=" + WeixinConfig.key);
                //重新組裝返參
                Map resultmap1 = new HashMap();
                resultmap1.put("timeStamp", nonce_str);
                resultmap1.put("nonceStr", resultmap.get("nonce_str"));
                resultmap1.put("package", "prepay_id=" + resultmap.get("prepay_id"));
                resultmap1.put("paySign", paySign);
                resultmap1.put("signType", WeixinConfig.sign_type);
                resultmap1.put("orderType", orderType);

                System.out.println(JSON.toJSONString(resultmap1));
                //將支付參數返給前端
                return JSON.toJSONString(resultmap1);
            } else {
                return "fail";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }


        return res;
    }

微信公眾號支付--錯誤記錄