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This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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/*
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.cookie.CookiePolicy;
import org.apache.commons.httpclient.methods.*;

/**
 * 

* A example that demonstrates how HttpClient APIs can be used to perform * form-based logon. *

* * @author Oleg Kalnichevski * */ public class FormLoginDemo { static final String LOGON_SITE = "developer.java.sun.com"; static final int LOGON_PORT = 80; public FormLoginDemo() { super(); } public static void main(String[] args) throws Exception { HttpClient client = new HttpClient(); client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT, "http"); client.getState().setCookiePolicy(CookiePolicy.COMPATIBILITY); // 'developer.java.sun.com' has cookie compliance problems // Their session cookie's domain attribute is in violation of the RFC2109 // We have to resort to using compatibility cookie policy GetMethod authget = new GetMethod("/servlet/SessionServlet"); client.executeMethod(authget); System.out.println("Login form get: " + authget.getStatusLine().toString()); // release any connection resources used by the method authget.releaseConnection(); // See if we got any cookies Cookie[] initcookies = client.getState().getCookies(LOGON_SITE, LOGON_PORT, "/", false); System.out.println("Initial set of cookies:"); if (initcookies.length == 0) { System.out.println("None"); } else { for (int i = 0; i < initcookies.length; i++) { System.out.println("- " + initcookies[i].toString()); } } PostMethod authpost = new PostMethod("/servlet/SessionServlet"); // Prepare login parameters NameValuePair action = new NameValuePair("action", "login"); NameValuePair url = new NameValuePair("url", "/index.html"); NameValuePair userid = new NameValuePair("UserId", "userid"); NameValuePair password = new NameValuePair("Password", "password"); authpost.setRequestBody( new NameValuePair[] {action, url, userid, password}); client.executeMethod(authpost); System.out.println("Login form post: " + authpost.getStatusLine().toString()); // release any connection resources used by the method authpost.releaseConnection(); // See if we got any cookies // The only way of telling whether logon succeeded is // by finding a session cookie Cookie[] logoncookies = client.getState().getCookies(LOGON_SITE, LOGON_PORT, "/", false); System.out.println("Logon cookies:"); if (logoncookies.length == 0) { System.out.println("None"); } else { for (int i = 0; i < logoncookies.length; i++) { System.out.println("- " + logoncookies[i].toString()); } } // Usually a successful form-based login results in a redicrect to // another url int statuscode = authpost.getStatusCode(); if ((statuscode == HttpStatus.SC_MOVED_TEMPORARILY) || (statuscode == HttpStatus.SC_MOVED_PERMANENTLY) || (statuscode == HttpStatus.SC_SEE_OTHER) || (statuscode == HttpStatus.SC_TEMPORARY_REDIRECT)) { Header header = authpost.getResponseHeader("location"); if (header != null) { String newuri = header.getValue(); if ((newuri == null) || (newuri.equals(""))) { newuri = "/"; } System.out.println("Redirect target: " + newuri); GetMethod redirect = new GetMethod(newuri); client.executeMethod(redirect); System.out.println("Redirect: " + redirect.getStatusLine().toString()); // release any connection resources used by the method redirect.releaseConnection(); } else { System.out.println("Invalid redirect"); System.exit(1); } } } }


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