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Java Source | 1998-12-12 | 3.3 KB | 90 lines |
- /*
- * @(#)SimpleServlet.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
- *
- * Note that in order to gaurentee that session response headers are
- * set correctly, the session must be retrieved before any output is
- * sent to the client.
- */
- public class SessionServlet extends HttpServlet {
-
- public void doGet (HttpServletRequest req, HttpServletResponse res)
- throws ServletException, IOException
- {
-
- //Get the session object
- HttpSession session = req.getSession(true);
-
- //Get the output stream
- ServletOutputStream out = res.getOutputStream();
-
- res.setContentType("text/html");
-
- out.println("<HEAD><TITLE> SessionServlet Output </TITLE></HEAD><BODY>");
- out.println("<h1> SessionServlet Output </h1>");
-
- Integer ival = (Integer) session.getValue("sessiontest.counter");
- if (ival==null) ival = new Integer(1);
- else ival = new Integer(ival.intValue() + 1);
- session.putValue("sessiontest.counter", ival);
- out.println("You have hit this page <b>" + ival + "</b> times.<p>");
- out.println("Click <a href=" + res.encodeUrl("/servlet/SessionServlet") + ">here</a>");
- out.println(" to ensure that session tracking is working even if cookies aren't supported.<br>");
- out.println(" Note that by default URL rewriting is not enabled due to it's expensive");
- out.println(" overhead.");
- out.println("<p>");
-
- out.println("<h3>Request and Session Data:</h3>");
- out.println("Session ID in Request: " + req.getRequestedSessionId());
- out.println("<br>Session ID in Request from Cookie: " + req.isRequestedSessionIdFromCookie());
- out.println("<br>Session ID in Request from URL: " + req.isRequestedSessionIdFromUrl());
- out.println("<br>Valid Session ID: " + req.isRequestedSessionIdValid());
- out.println("<h3>Session Data:</h3>");
- out.println("New Session: " + session.isNew());
- out.println("<br>Session ID: " + session.getId());
- out.println("<br>Creation Time: " + session.getCreationTime());
- out.println("<br>Last Accessed Time: " + session.getLastAccessedTime());
- out.println("<h3>Session Context Data:</h3>");
- HttpSessionContext context = session.getSessionContext();
-
- for (Enumeration e = context.getIds(); e.hasMoreElements() ;) {
- out.println("Valid Session: " + (String)e.nextElement()+ "<br>");
- }
-
- out.println("</BODY>");
- out.close();
- }
-
- public String getServletInfo() {
- return "A simple servlet";
- }
- }
-