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  Tutorial: Java JSP and Servlets Web Application Events Tutorial

This article describes what are application events and how you can use them. Focuses on two important web application events; Application startup and shutdown, Session creation and invalidation.

Tutorial Details:

Java JSP and Servlets Web Application Events Tutorial
Web application events are new in Servlet 2.3 specification. They give you greater degree of control over your web application. In this article we will study two important application events :
Application startup and shutdown
Session creation and invalidation

As their names suggest, application startup event occurs when your web application is first loaded and started by the Servlet container and application shutdown event occurs when the web application is shutdown. Session creation event occurs everytime a new session is created on the server and similarly session invalidation event occurs everytime a session is invalidated. To make use of these web application events and to do something useful you'll have to create and make use of special "listener" classes . From here onwards, we'll look at what these listener classes are how you can use them.

Listener Classes :
These are simple Java classes which implement one of the two following interfaces
javax.servlet.ServletContextListener
javax.servlet.http.HttpSessionListener
If you want your class to listen for application startup and shutdown events then implement ServletContextListener interface. If you want your class to listen for session creation and invalidation events then implement HttpSessionListener interface.


 

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