This tip shows how to use cookies. The application below sets an HTTP cookie and updates the cookie's value across multiple HTTP GET requests.
/* * $Header: * $Revision$ * $Date$ * ==================================================================== * * 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 * <http://www.apache.org/>. * * [Additional notices, if required by prior licensing conditions] * */
/** * * This is a sample application that demonstrates * how to use the Jakarta HttpClient API. * * This application sets an HTTP cookie and * updates the cookie's value across multiple * HTTP GET requests. * * @author Sean C. Sullivan * @author Oleg Kalnichevski * */ public class CookieDemoApp {
/** * * Usage: * java CookieDemoApp http://mywebserver:80/ * * @param args command line arguments * Argument 0 is a URL to a web server * * */ public static void main(String[] args) throws Exception {
if (args.length != 1) { System.err.println("Usage: java CookieDemoApp <url>"); System.err.println("<url> The url of a webpage"); System.exit(1); }
// Get initial state object HttpState initialState = new HttpState();
// Initial set of cookies can be retrieved from persistent storage // and re-created, using a persistence mechanism of choice, Cookie mycookie = new Cookie(".foobar.com", "mycookie", "stuff", "/", null, false);
// and then added to your HTTP state instance initialState.addCookie(mycookie);
// Get HTTP client instance HttpClient httpclient = new HttpClient(); httpclient.getHttpConnectionManager(). getParams().setConnectionTimeout(30000); httpclient.setState(initialState);
// RFC 2101 cookie management spec is used per default // to parse, validate, format & match cookies httpclient.getParams().setCookiePolicy(CookiePolicy.RFC_2109);
// A different cookie management spec can be selected // when desired
//httpclient.getParams().setCookiePolicy(CookiePolicy.NETSCAPE); // Netscape Cookie Draft spec is provided for completeness // You would hardly want to use this spec in real life situations // httppclient.getParams().setCookiePolicy( // CookiePolicy.BROWSER_COMPATIBILITY); // Compatibility policy is provided in order to mimic cookie // management of popular web browsers that is in some areas // not 100% standards compliant
// Get HTTP GET method GetMethod httpget = new GetMethod(strURL);
// Execute HTTP GET int result = httpclient.executeMethod(httpget);
// Display status code System.out.println("Response status code: " + result);
// Get all the cookies Cookie[] cookies = httpclient.getState().getCookies();
// Display the cookies System.out.println("Present cookies: "); for (int i = 0; i < cookies.length; i++) { System.out.println(" - " + cookies[i].toExternalForm()); }
// Release current connection to the connection pool // once you are done httpget.releaseConnection();