Java tutorial
/******************************************************************************* * Copyright (c) 2015 IBM Corp. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ package net.wasdev.gameon.auth.twitter; import java.io.IOException; import javax.annotation.Resource; import javax.naming.NamingException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.TwitterFactory; import twitter4j.auth.RequestToken; import twitter4j.conf.ConfigurationBuilder; @WebServlet("/TwitterAuth") public class TwitterAuth extends HttpServlet { private static final long serialVersionUID = 1L; @Resource(lookup = "twitterOAuthConsumerKey") String key; @Resource(lookup = "twitterOAuthConsumerSecret") String secret; public TwitterAuth() { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ConfigurationBuilder c = new ConfigurationBuilder(); c.setOAuthConsumerKey(key).setOAuthConsumerSecret(secret); Twitter twitter = new TwitterFactory(c.build()).getInstance(); request.getSession().setAttribute("twitter", twitter); try { // twitter will tell the users browser to go to this address once // they are done authing. StringBuffer callbackURL = request.getRequestURL(); int index = callbackURL.lastIndexOf("/"); callbackURL.replace(index, callbackURL.length(), "").append("/TwitterCallback"); // to initiate an auth request, twitter needs us to have a request // token. RequestToken requestToken = twitter.getOAuthRequestToken(callbackURL.toString()); // stash the request token in the session. request.getSession().setAttribute("requestToken", requestToken); // send the user to twitter to be authenticated. response.sendRedirect(requestToken.getAuthenticationURL()); } catch (TwitterException e) { throw new ServletException(e); } } }