jsp&servlet——session监听

session监听，需要实现HttpSessionAttributeListener接口

attributeAdded：监听添加session

attributeRemoved：监听删除session

attributeReplaced：监听修改session

 package com.gxy.Listener;

 import javax.servlet.http.HttpSessionAttributeListener;
 import javax.servlet.http.HttpSessionBindingEvent;

 public class sessionAttributeListener implements HttpSessionAttributeListener {

     public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) {
         // TODO Auto-generated method stub
         System.out.println("添加的属性名："+httpSessionBindingEvent.getName()+",添加的属性值"+httpSessionBindingEvent.getValue());
     }

     public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) {
         // TODO Auto-generated method stub
         System.out.println("删除的属性名："+httpSessionBindingEvent.getName()+",删除的属性值"+httpSessionBindingEvent.getValue());
     }

     public void attributeReplaced(HttpSessionBindingEvent httpSessionBindingEvent) {
         // TODO Auto-generated method stub
         System.out.println("修改的属性名："+httpSessionBindingEvent.getName()+",修改的属性值"+httpSessionBindingEvent.getValue());
     }

 }

配置web.xml

 <listener>
     <listener-class>com.gxy.Listener.sessionAttributeListener</listener-class>
 </listener>

运行结果