使用HttpUrlConnection将Json对象发送到Django服务器

Question

我正在研究android应用，它将记录音频并使用HttpUrlConnection将base64编码的字符串发送到django服务器。问题是当我按“发送到服务器”应用程序崩溃时。任何人都可以帮助我代码错误的地方。预先感谢您的宝贵时间。

  

我只想向服务器发送数据

变量

HttpURLConnection connection;
URL urlConnection = new URL("My url");
JSONObject jResponse;

“发送到服务器”按钮的代码

 File file = new File(Environment.getExternalStorageDirectory() + "/_audio_record.3gp");
                try {

                    byte[] bytes = FileUtils.readFileToByteArray(file);
                   encoded = Base64.encodeToString(bytes, NO_WRAP);
                    Log.i("myApp",encoded);
                    Toast.makeText(getApplicationContext(),encoded,Toast.LENGTH_LONG).show();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                //Sending json to server

                JSONObject param=new JSONObject();

                try {
                    param.put("name",encoded);
                } catch (JSONException e) {
                    e.printStackTrace();
                }

                makeRequest(param.toString());

makeRequest（）

 private JSONObject makeRequest(String param) {


        try {
            HttpURLConnection connection = (HttpURLConnection) urlConnection.openConnection();
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-type", "application/json;charset=UTF-8");
            connection.setReadTimeout(60000);
            connection.setConnectTimeout(60000);
            connection.connect();

            DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
            Log.d("MyApp" ,param);
            dataOutputStream.writeBytes(param);
            dataOutputStream.flush();
            dataOutputStream.close();

            InputStream in = new BufferedInputStream(connection.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            StringBuilder result = new StringBuilder();
            String line;

            while ((line = reader.readLine()) != null)
            {
                result.append(line);
            }

            Log.d("MyApp: ",result.toString());

            jResponse = new JSONObject(result.toString());

        }
        catch (IOException | JSONException e) {
            e.printStackTrace();
            return jResponse=null;
        }
        connection.disconnect();
        return jResponse;
    }