52 lines
1.6 KiB
Java
52 lines
1.6 KiB
Java
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Servlet session event notifications
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package com.ack.web.servlet;
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import javax.servlet.http.HttpSessionActivationListener;
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import javax.servlet.http.HttpSessionAttributeListener;
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import javax.servlet.http.HttpSessionBindingEvent;
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import javax.servlet.http.HttpSessionEvent;
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/**
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* Get application events for when a servlet session
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* is activated and destroyed. Also, get events when
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* attributes are added, removed and replaced within
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* the servlet session.
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<web-app>
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<listener>
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<listener-class>com.ack.web.servlet.ServletSessionEventNotifications</listener-class>
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</listener>
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</web-app>
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*/
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public class ServletSessionEventNotifications
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implements HttpSessionAttributeListener, HttpSessionActivationListener {
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public void sessionDidActivate( HttpSessionEvent evt ) {
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System.out.println( "session activated: " + evt );
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}
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public void sessionWillPassivate( HttpSessionEvent evt ) {
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System.out.println( "session passivated: " + evt );
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}
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public void attributeAdded( HttpSessionBindingEvent evt ) {
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System.out.println( "attribute added to session: " + dump( evt ) );
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}
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public void attributeRemoved( HttpSessionBindingEvent evt ) {
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System.out.println( "attribute removed from session: " + dump( evt ) );
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}
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public void attributeReplaced( HttpSessionBindingEvent evt ) {
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System.out.println( "attribute replaced in session: " + dump( evt ) );
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}
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private String dump( HttpSessionBindingEvent evt ) {
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return "\n attribute name: " + evt.getName() + "\n session: " +
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evt.getSession() + "\n attribute value: " + evt.getValue();
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}
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}
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