public static String sendPostV2(String postUrl,String params,String headers){
        CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
        //建立一個連線
        try {
            HttpPost httpPost = new HttpPost(postUrl);
            //這個防止中文???，很重要，很重要，很重要
            httpPost.setEntity(new StringEntity(params, Charset.forName("UTF-8")));
            //設定頭資訊
            JSONObject jsonObject = JSONObject.parseObject(headers);
            Set<String> keys = jsonObject.keySet();
            for (String key:keys){
                httpPost.setHeader(key,jsonObject.getString(key));
            }
            //傳送
            HttpResponse httpResponse = closeableHttpClient.execute(httpPost);
            int returnCode = httpResponse.getStatusLine().getStatusCode();
            if (returnCode== HttpStatus.SC_OK){
                InputStream inputStream = httpResponse.getEntity().getContent();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuffer stringBuffer = new StringBuffer();
                String line = "";
                while ((line = bufferedReader.readLine())!=null){
                    stringBuffer.append(line);
                }
                return stringBuffer.toString();
            }
        }catch (IOException e){
            e.printStackTrace();
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("code","404");
            jsonObject.put("result","no result");
            return jsonObject.toJSONString();
        }
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code","404");
        jsonObject.put("result","no result");
        return jsonObject.toJSONString();
    }