[游戏开发]微信支付-创建订单，调用Native支付接口

    @Transactional(rollbackFor = Exception.class)
    @Override
    public Map<String, Object> nativePay(Long productId) throws Exception {

        log.info("生成订单");

        //生成订单
        OrderInfo orderInfo = orderInfoService.createOrderByProductId(productId);
        String codeUrl = orderInfo.getCodeUrl();
        if(orderInfo != null && !StringUtils.isEmpty(codeUrl)){
            log.info("订单已存在，二维码已保存");
            //返回二维码
            Map<String, Object> map = new HashMap<>();
            map.put("codeUrl", codeUrl);
            map.put("orderNo", orderInfo.getOrderNo());
            return map;
        }


        log.info("调用统一下单API");

        //调用统一下单API
        HttpPost httpPost = new HttpPost(wxPayConfig.getDomain().concat(WxApiType.NATIVE_PAY.getType()));

        // 请求body参数
        Gson gson = new Gson();
        Map paramsMap = new HashMap();
        paramsMap.put("appid", wxPayConfig.getAppid());
        paramsMap.put("mchid", wxPayConfig.getMchId());
        paramsMap.put("description", orderInfo.getTitle());
        paramsMap.put("out_trade_no", orderInfo.getOrderNo());
        paramsMap.put("notify_url", wxPayConfig.getNotifyDomain().concat(WxNotifyType.NATIVE_NOTIFY.getType()));

        Map amountMap = new HashMap();
        amountMap.put("total", orderInfo.getTotalFee());
        amountMap.put("currency", "CNY");

        paramsMap.put("amount", amountMap);

        //将参数转换成json字符串
        String jsonParams = gson.toJson(paramsMap);
        log.info("请求参数 ===> {}" + jsonParams);

        StringEntity entity = new StringEntity(jsonParams,"utf-8");
        entity.setContentType("application/json");
        httpPost.setEntity(entity);
        httpPost.setHeader("Accept", "application/json");

        //完成签名并执行请求
        CloseableHttpResponse response = wxPayClient.execute(httpPost);

        try {
            String bodyAsString = EntityUtils.toString(response.getEntity());//响应体
            int statusCode = response.getStatusLine().getStatusCode();//响应状态码
            if (statusCode == 200) { //处理成功
                log.info("成功, 返回结果 = " + bodyAsString);
            } else if (statusCode == 204) { //处理成功，无返回Body
                log.info("成功");
            } else {
                log.info("Native下单失败,响应码 = " + statusCode+ ",返回结果 = " + bodyAsString);
                throw new IOException("request failed");
            }

            //响应结果
            Map<String, String> resultMap = gson.fromJson(bodyAsString, HashMap.class);
            //二维码
            codeUrl = resultMap.get("code_url");

            //保存二维码
            String orderNo = orderInfo.getOrderNo();
            orderInfoService.saveCodeUrl(orderNo, codeUrl);

            //返回二维码
            Map<String, Object> map = new HashMap<>();
            map.put("codeUrl", codeUrl);
            map.put("orderNo", orderInfo.getOrderNo());

            return map;

        } finally {
            response.close();
        }
    }

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