Java tutorial
/* * Copyright (C) 2005-2013, Stefan Strmberg <stefangs@nethome.nu> * * This file is part of OpenNetHome (http://www.nethome.nu) * * OpenNetHome is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * OpenNetHome is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package nu.nethome.home.items.web.proxy; import org.json.JSONObject; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.ProtocolException; import java.net.URL; public class JsonRestClient { public JSONData get(String baseUrl, String resource, JSONObject argument) throws IOException { return new JSONData(performRequest(baseUrl, resource, argument != null ? argument.toString() : "", "GET")); } public JSONData put(String baseUrl, String resource, JSONObject argument) throws IOException { return new JSONData(performRequest(baseUrl, resource, argument != null ? argument.toString() : "", "PUT")); } public JSONData post(String baseUrl, String resource, JSONObject argument) throws IOException { return new JSONData(performRequest(baseUrl, resource, argument != null ? argument.toString() : "", "POST")); } private String performRequest(String baseUrl, String resource, String body, String method) throws IOException { HttpURLConnection connection = null; DataOutputStream wr = null; BufferedReader rd = null; StringBuilder sb = new StringBuilder(); String line; URL serverAddress; try { serverAddress = new URL(baseUrl + resource); //Set up the initial connection connection = (HttpURLConnection) serverAddress.openConnection(); connection.setRequestMethod(method); connection.setDoOutput(true); connection.setReadTimeout(15000); connection.setInstanceFollowRedirects(false); connection.setRequestProperty("Content-Type", "application/json"); connection.setUseCaches(false); if (body.length() > 0) { connection.setRequestProperty("Content-Length", "" + Integer.toString(body.getBytes().length)); wr = new DataOutputStream(connection.getOutputStream()); wr.writeBytes(body); wr.flush(); wr.close(); } connection.connect(); if (connection.getResponseCode() < 200 || connection.getResponseCode() > 299) { throw new ProtocolException("Bad HTTP response code: " + connection.getResponseCode()); } rd = new BufferedReader(new InputStreamReader(connection.getInputStream())); while ((line = rd.readLine()) != null) { sb.append(line); sb.append('\n'); } } finally { if (rd != null) { rd.close(); } if (wr != null) { wr.close(); } if (connection != null) { connection.disconnect(); } } return sb.toString(); } }