May 2004
Beginner to intermediate
1032 pages
23h 48m
English
book
Sams Teach Yourself J2EE™ in 21 Days, Second Edition
by Martin Bond, Dan Haywood, Debbie Law, Andy Longshaw, Peter Roxburgh
Content preview from Sams Teach Yourself J2EE™ in 21 Days, Second Edition
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Event Listening
A servlet can be designated as an event listener. This enables the servlet to be notified when a lifecycle event or a change to request or session attributes has occurred.
There are a number of listener interfaces that you can implement in your servlet. All the listener interfaces extend java.util.EventListener.
Table 12.6 provides a list of the listener interfaces.
| Listener Interface | Notification |
|---|---|
| ServletRequestAttributeListener | When a request attribute is added, removed, or replaced |
| ServletRequestListener | When the processing of a request is started |
| HttpSessionAttributeListener | When a session attribute is added, removed, or replaced |
| HttpSessionListener | When a session is created, replaced, or ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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