Listeners

Listener is a java program, waiting for some event to happen. Servlet API provides number of Useful listener classes for various purposes.

Listeners provides by javax.servlet package

   ServletContextListener

   ServletContextAttributeListener

   ServletRequestListener

   ServletRequestAttributeListener

   WriteListener

   ReadListener

   AsyncListener

Listeners provided by javax.servlet.http package

   HttpSessionListener

   HttpSessionIdListener

   HttpSessionBindingListener

   HttpSessionAttributeListener

   HttpSessionActivationListener

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