gistfile1.java

 public static String paste(String urlParameters) {
        HttpURLConnection connection = null;
        try {

            URL url = new URL(pasteURL);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoInput(true);
            connection.setDoOutput(true);
            BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream(), "UTF-8"));
            wr.write(urlParameters);
            wr.flush();
            wr.close();
 
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuilder response = new StringBuilder();
            while ((inputLine = in.readLine()) != null) response.append(inputLine);
            in.close();
            JsonElement json = new JsonParser().parse(response.toString());
            if (!json.isJsonObject()) throw new IOException("error");
            return json.getAsJsonObject().get("key").getAsString();

        } catch (IOException e) {
            return null;
        } finally {
            if (connection == null) return null;
            connection.disconnect();
        }
    }