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2£©javax.servlet.http.HttpSessionListener;
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HttpSessionListener µÄʵÏÖÀà±¾Éí¾ÍÊÇÒ»¸ö¼àÌýÆ÷£¬ÒªÊ¹ÓÃËüÐèÒªÔÚ web.xml ÖÐÆô¶¯Õâ¸ö¼àÌýÆ÷£¬ÀýÈç
<listener>
<listener-class>packname.classname</listener-class>
</listener>
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ǰÕߵĴ¥·¢È¡¾öÓÚ session ÖмÓÈëµÄÊôÐÔ£»
ºóÕߵĴ¥·¢È¡¾öÓÚ session ±¾ÉíµÄ²úÉúºÍÏûÍö£»
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¶ÔServletContextµÄ¼àÌýºÍ¶ÔRequest¼àÌý
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ÔÚÏßÈËÊýÁбíÊǶÔËùÓÐÈËÆð×÷Óã¬Êý¾ÝÓ¦·Åµ½applicationÖС£¼´ServletContext¶ÔÏó
OnLineDemo.java
package demo;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

/*
* <listener> <listener-class>demo.OnLineDemo</listener-class>
* </listener>
*/

public class OnlineDemo implements ServletContextListener, HttpSessionListener,
HttpSessionAttributeListener {
// ÉùÃ÷Ò»¸öServletContext¶ÔÏó
private ServletContext application = null;

public void contextInitialized(ServletContextEvent sce) {
// ÈÝÆ÷³õʼ»¯Ê±£¬ÏòapplicationÖдæ·ÅÒ»¸ö¿ÕµÄÈÝÆ÷
this.application = sce.getServletContext();
this.application.setAttribute


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