sessionBinding Event

[Kesavanarayanan, Ramesh (Cognizant)]

Hi all,

Somebody was asking about how to capture the sessionbindingevent and get
notified.

Here is the sample code for that. HTH

I am using jsdk2.1 so commented setAttribute()
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SessionItemNotification extends HttpServlet
{
  public void doGet(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException
  {
    HttpSession session = req.getSession();

   // session.setAttribute("cone", new KnowAllItem("snake eyes") );
    session.putValue("cone",new KnowAllItem("snake Eyes"));
   // session.removeAttribute("cone");
      session.removeValue("cone");

    res.getWriter().println( "check your console..." );
  }
}

/**
 * By implementing HttpSessionBindingListener, KnowAllItem objects get
 * informed when they are added and/or removed from a servlet session
 *
 * Also, remember to make you session items serializable
 */
class KnowAllItem implements HttpSessionBindingListener, Serializable
{
  private String id;

  public KnowAllItem(String theId)
  {
    id = theId;
  }

  public void valueBound(HttpSessionBindingEvent evt)
  {
    System.out.println( "added KnowAllItem to session -> " + dump(evt) );
  }

  public void valueUnbound(HttpSessionBindingEvent evt)
  {
    System.out.println( "removed KnowAllItem from session -> " + dump(evt)
);
  }

  private String dump(HttpSessionBindingEvent evt)
  {
    return "\n attribute name: " + evt.getName() + "\n session: " +
evt.getSession() +
//"\n attribute value :"+ evt.getValue() ;
  }

  public String toString()
  {
    return id;
  }
}

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