How to close a session when user clicks Logout

In my jsp page i create a session for every user's name.
when particular user clicks logut without closing his personal page,
the others can access his page.
so, how to close a session when clicks logout link.?
similarly when user gets signin one system,he will not be sigin in other system.but how can we achieve this?
Thanks in Advance

What is the name of the session variable that you are creating on login? When he clicks logout, set that session variable to null. Like session.setAttribute("userName",null); and check for non-null condition before proceeding with any functionality in your jsp's.
What is the second question? You want to prevent duplicate logins from different systems? You would have to maintain a static datastructure like a HashMap for instance. Everytime a user logs in, put an entry into the HashMap...like userMap.put("userName","userName"); If an entry already exists, throw a message saying that user already logged in from another machine...

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Invalidate session when user clicks back button

I want to invalidate the session when user clicks back button, so that user cannot refresh and reload a page.
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Message was edited by:
sam_amc

* SessionInvalidator.java
* Created on October 27, 2006, 9:18 AM
package web;
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
* @author javious
* @version
public class SessionInvalidator extends HttpServlet {
 /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
 * @param request servlet request
 * @param response servlet response
 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 response.setContentType("text/html;charset=UTF-8");
 PrintWriter out = response.getWriter();
 String reposted = request.getParameter("reposted");
 if("true".equals(reposted))
 HttpSession session = request.getSession(false);
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 out.println("<html>");
 out.println("<head>");
 out.println("<title>Servlet SessionInvalidator</title>");
 out.println("</head>");
 out.println("<body>");
 out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
 out.println("I said, your session is now invalid! Now where are those Duke Dollars at?");
 out.println("</body>");
 out.println("</html>");
 else
 Integer hitCount = (Integer)session.getAttribute("hitCount");
 if(hitCount == null)
 // This is step 2 (the "good" - "stay" page.)
 out.println("<html>");
 out.println("<head>");
 out.println("<title>Servlet SessionInvalidator</title>");
 out.println("</head>");
 out.println("<body>");
 out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
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 out.println("</body>");
 out.println("</html>");
 hitCount = 1;
 session.setAttribute("hitCount", hitCount);
 else
 //We've used up our good visit
 session.invalidate();
 // This is step 3
 out.println("<html>");
 out.println("<head>");
 out.println("<title>Servlet SessionInvalidator</title>");
 out.println("</head>");
 out.println("<body>");
 out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
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 out.println("</body>");
 out.println("</html>");
 else
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 out.println("</head>");
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 out.println("<input type=\"hidden\" name=\"reposted\" value=\"true\">");
 out.println("</form>");
 out.println("</body>");
 out.println("</html>");
 out.close();
 // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
 /** Handles the HTTP <code>GET</code> method.
 * @param request servlet request
 * @param response servlet response
 protected void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 processRequest(request, response);
 /** Handles the HTTP <code>POST</code> method.
 * @param request servlet request
 * @param response servlet response
 protected void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 processRequest(request, response);
 /** Returns a short description of the servlet.
 public String getServletInfo() {
 return "Short description";
 // </editor-fold>
}The problem with even attempting to do this is that with today's browser capabilities, users can optionally choose to jump to a particular page in the browser history and this may not necessarily be the most recent page. In this case, you would also want to invalidate the user's session after already having been there (whatever page that may be). Then you have situations when the user may wish to jump back in history to external pages they were visiting before they reached your own site's pages. Then what happens when they start clicking forward, forward, etc... from there? This is why I prefer writing Swing Clients as alternatives to browser applications. There are soo many possible ways break web applications made for standard web browsers both maliciously and simply by accident or irregular user patterns. Regardless, this servlet would work based on the assumption that all the user(s) would "ever" do aside from moving logically forward is clicking on the browser's "back" button.
cheers!
Message was edited by:
javious

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How to close a session when user clicks Logout

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