Here is how I use the HttpSessionListener.
First I create a Class that implements HttpSessionListener:
package com.gri.web;
import javax.servlet.http.*;
public MySessionListener implements HttpSessionListener
{
private static int num_sessions = 0;
private HttpSession session = null; public void sessionCreated(HttpSessionEvent se)
{
num_sessions++;
session = se.getSession();
}
public void sessionDestroyed(HttpSessionEvent se)
{ num_session--;}
public static int getNumSessions() {return num_sessions; }
public static HttpSession getLastSession() { return session;}
}Now include this in the web.xml for your context (directly after filter&filter-mapping but before Servlet element):
|<listener>| ||| <listener-class>com.gri.web.MySessionListener</listener-class> </listener>||
now all you have to do is create a JSP: <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page";> <jsp:directive.page import="com.gri.web.*" /> <jsp:text> <html> <body> |Last user in session: </jsp:text> <jsp:expression> MySessionListener.getLastSession().getAttribute("j_username") </jsp:expression> |<jsp:text> |Username of current person </jsp:text> <jsp:expression> session.getAttribute("j_username") </jsp:expression> |</jsp:root>
|</body> </html> </jsp:root> Hart, Justin wrote:
Ok, still, I haven't found any documentation on how to add a SessionListener in the server.xml file, and adding one using the listener tags defined for web.xml files doesn't seem to work.
I also haven't seen how to get a user's credentials from a HttpSession, or how to get a Session from an HttpSessionListener. Could you throw me a bone?
Justin
-----Original Message----- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Monday, December 01, 2003 2:52 PM To: Tomcat Users List Subject: RE: SessionListener
Howdy, A SessionListener of the org.apache.catalina variety would go in the same place as all tomcat-specific features: $CATALINA_HOME/conf/server.xml. That means the class specified there must be accessible to the server classloaders, i.e. must reside in common/lib or higher on the classloader hierarchy.
The above is true for Valves, Realms, Listeners, etc, that are proprietary to tomcat.
Yoav Shapira Millennium ChemInformatics
can-----Original Message----- From: Hart, Justin [mailto:[EMAIL PROTECTED] Sent: Monday, December 01, 2003 11:53 AM To: Tomcat Users List Subject: RE: SessionListener
Ok, so, the listener in there must implement HttpSessionListener, where
I use SessionListeners?authenticates to
Justin
-----Original Message----- From: Hart, Justin Sent: Monday, December 01, 2003 11:34 AM To: Tomcat Users List (E-mail) Subject: SessionListener
My SessionListener doesn't seem to be firing, any help?
I have a SessionListener that I want to go off when a user
my web app (this is a correct usage, right?)
So, in the web.xml of my app, I would put the lines:
<web-app> <listener> <listener-class> the class </listener-class> </listener> </web-app>
This should fire off when the user signs in to the page, correct?
Justin
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