add comment

/**
     * Passings the arguments, the functions will, assyncronously create a comment in database
     * @param author id of author
     * @param text text of comment
     * @param date_hour date of cooment
     * @param post id of post where the comment will be made
     * @return return the comment created ou null if any error
     * @throws IOException
     * @throws ExecutionException
     * @throws InterruptedException
     */
    public static Comment addComment(final long author, final String text, final String date_hour, final long post) throws IOException, ExecutionException, InterruptedException {
        AsyncTask<Void, Void, Comment> task = new AsyncTask<Void, Void, Comment>() {
            protected Comment doInBackground(Void... params) {
                URL url;
                Comment ret = null;
                try {
                    url = new URL(RequestUtils.SERVERURL+ "/comment/add");
                    HttpURLConnection con = (HttpURLConnection) url.openConnection();
                    con.setDoOutput(true);
                    con.setDoInput(true);
                    con.setRequestMethod("POST");
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    //MUST INCLUDE HEADER
                    baos.write(RequestUtils.header());

                    baos.write(RequestUtils.data(TEXT_COL_DB, text));
                    baos.write(RequestUtils.data(DATE_HOUR_COL_DB, date_hour));
                    baos.write(RequestUtils.data(AUTHOR_COL_DB, String.valueOf(author)));
                    baos.write(RequestUtils.data(POST_COL_DB, String.valueOf(post)));

                    //MUST INCLUDE endRequest
                    baos.write(RequestUtils.endRequest());

                    byte[] to_stream = baos.toByteArray();
                    baos.close();
                    con.setFixedLengthStreamingMode(to_stream.length);
                    con.setRequestProperty("Connection", "Keep-Alive");
                    con.setRequestProperty("User-Agent", "Android Multipart HTTP Client 1.0");
                    con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + RequestUtils.BOUNDARY);
                    con.getOutputStream().write(to_stream);
                    int code = con.getResponseCode();
                    if(code == HttpURLConnection.HTTP_OK){
                        String jsonString = RequestUtils.readStream(con.getInputStream());
                        ret = Comment.getFromJson(jsonString);
                    }else if(code == HttpURLConnection.HTTP_INTERNAL_ERROR){
                        String out = RequestUtils.readStream(con.getErrorStream());
                        Log.e("myDebug", out);
                    }
                    con.disconnect();

                } catch (IOException e) {
                    e.printStackTrace();
                } catch (ParseException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                return ret;
            }
        };
        task.execute();
        return task.get();
    }