Daniel Paranhos wrote:
>
> I want to change a variable stored in jsp application object when
> the user session expires. I'm using the method
> valueUnbound(HttpSessionBindingEvent event) of the
> HttpSessionBindingListener interface to catch this event in one of my java
> classes. I know how to change a variable stored in the session object
> because it comes by parameter in the method valueUnbound. What should I
> do? Is there anyway to get the application object to a java class?
I suggest that you give the object that listens for the valueUnbound
event a reference to the ServletContext (i.e. the class that's referred
to by the JSP application implicit variable) when it's created, e.g.
something like this:
package com.mycompany;
public class SessionHandler implements HttpSessionBindingListener {
private ServletContext context;
public void setServletContext(ServletContext context) {
this.context = context;
}
public ServletContext getServletContext() {
return context;
}
public void valueUnbound(HttpSessionBindingEvent event) {
ServletContext context = getServletContext();
// Do whatever you want to do with the context variable
}
...
}
In your JSP page, you can create and initialize it like this:
<jsp:useBean id="sessionHandler" class="com.mycompany.SessionHandler"
scope="application">
<jsp:setProperty name="sessionHandler" property="servletContext"
value="<%= application %>" />
</jsp:useBean>
Hans
<plug>
You find a more detailed example of a bean like this in Chapter 15,
Developing JavaBeans for JSP, in my JavaServer Pages book.
<http://TheJSPBook.com/>
</plug>
--
Hans Bergsten [EMAIL PROTECTED]
Gefion Software http://www.gefionsoftware.com
Author of JavaServer Pages (O'Reilly), http://TheJSPBook.com
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Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
