package examples.servlets;
/*
* @(#)SessionServlet.java 1.21 97/05/22
*
* Copyright (c) 1996-1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
* CopyrightVersion 1.0
*/
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* This is a simple example of an HTTP Servlet that uses the HttpSession
* class to track the number of times that a client has visited the servlet.
* Using session tracking provides an alternative method for tracking
* a client and storing client specific data, when the client browser
* does not support cookies. This is achieved by encoding a tracking id
* into the URLs linked in the pages that are returned to the client.
*
* Ensure that session tracking via URLRewriting is turned on in your
* weblogic.properties file, if you wish to test this example with cookies
* turned off in your browser.
*
* @author Adapted from the JSDK2.0 by BEA Systems, Inc.
*/
public class SessionServlet extends HttpServlet {
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
//Get the session object
HttpSession session = req.getSession(true);
// set content type and other response header fields first
res.setContentType("text/html");
// then write the data of the response
PrintWriter out = res.getWriter();
out.println("
" + "SessionServlet Output " +
"");
out.println(" SessionServlet Output
");
// Retrieve the count value from the session
Integer ival = (Integer) session.getAttribute("sessiontest.counter");
if (ival==null)
ival = new Integer(1);
else
ival = new Integer(ival.intValue() + 1);
session.setAttribute("sessiontest.counter", ival);
out.println("You have hit this page " + ival + " times.");
out.println("Click here");
out.println(" to ensure that session tracking is working even " +
"if cookies aren't supported.
");
out.println("Note that by default URL rewriting is not enabled " +
"due to it's expensive overhead");
out.println("
");
out.println("
Request and Session Data:
");
out.println("Session ID in Request: " +
req.getRequestedSessionId());
out.println("
Session ID in Request from Cookie: " +
req.isRequestedSessionIdFromCookie());
out.println("
Session ID in Request from URL: " +
req.isRequestedSessionIdFromURL());
out.println("
Valid Session ID: " +
req.isRequestedSessionIdValid());
out.println("Session Data:
");
out.println("New Session: " + session.isNew());
out.println("
Session ID: " + session.getId());
out.println("
Creation Time: " + session.getCreationTime());
out.println("
Last Accessed Time: " +
session.getLastAccessedTime());
out.println("");
}
public String getServletInfo() {
return "A simple servlet";
}
}