问通过HTTP post从JSON中的Android到Python Flask的UTF-8编码字符串

EN

System.out.println("Building the http request");
            URL url = new URL(getString(R.string.home_server_url_send_records));
            SendTracksObject sendTracksObject = buildRecordsJson();
            JSONArray listOfRecords = sendTracksObject.listOfRecordsJsonArray;
            JSONObject sendToServerObject = new JSONObject();
            sendToServerObject.put("Track_History", listOfRecords);

            System.out.println("Sending: " + sendToServerObject.toString());
            Gson gson = new GsonBuilder().setPrettyPrinting().create();
            JsonParser jp = new JsonParser();
            JsonElement je = jp.parse(sendToServerObject.toString());
            String prettyJsonString = gson.toJson(je);
            System.out.println(prettyJsonString);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            conn.setRequestProperty("Accept", "*/*");
            conn.setRequestProperty("Cache-Control", "no-cache");
            conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
            conn.setDoOutput(true);
            conn.setDoInput(true);

            conn.connect();

            DataOutputStream os = new DataOutputStream(conn.getOutputStream());
            os.writeBytes(sendToServerObject.toString());

            os.flush();
            os.close();

            int responseCode = conn.getResponseCode();
            String responseMessage = conn.getResponseMessage();

            System.out.println(responseCode + ": " + responseMessage);
            conn.disconnect;