a.java

  @Override
    protected String doInBackground(String... data) {
        HttpURLConnection urlConnection = null;
        try {
            URL url = new URL("http://192.168.1.7:1337/api/doc");
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("POST");
            urlConnection.setRequestProperty("Accept", "application/json");
            urlConnection.setRequestProperty("Content-type", "application/json");
            urlConnection.setRequestProperty("charset", "utf-8");
            JSONObject jsonParam = new JSONObject();
            jsonParam.put("name", "25");
            jsonParam.put("content", "Real");
            String requestData = jsonParam.toString();
            urlConnection.setRequestProperty("Content-Length", "" + requestData.getBytes().length);

            DataOutputStream out = new DataOutputStream(urlConnection.getOutputStream());

            out.writeBytes(requestData);
            out.flush ();
            out.close ();

            InputStream in = new BufferedInputStream(urlConnection.getInputStream());
            Scanner s = new Scanner(in).useDelimiter("\\A");
            String res = s.hasNext() ? s.next() : "";
            return res;
        } catch (Exception ex) {
            Log.e("er55r",ex.getMessage());
        } finally {
            urlConnection.disconnect();
        }

        return "";
    }