web.xml配置
<listener><listener-class>com.interceptor.UserListener1</listener-class></listener>
代码,实现HttpSessionAttributeListener接口,在httpsession中添加/移除用户信息时实现登录人数统计
package com.interceptor; import javax.servlet.http.HttpSessionActivationListener; import javax.servlet.http.HttpSessionAttributeListener; import javax.servlet.http.HttpSessionBindingEvent; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; public class UserListener1 implements HttpSessionListener,HttpSessionActivationListener,HttpSessionAttributeListener { private static int acivateusercount=0; @Override public void sessionCreated(HttpSessionEvent arg0) { // TODO Auto-generated method stub } @Override public void sessionDestroyed(HttpSessionEvent arg0) { // TODO Auto-generated method stub } public static synchronized int getactivated (){ return acivateusercount; } @Override public void sessionDidActivate(HttpSessionEvent arg0) { // TODO Auto-generated method stub } @Override public void sessionWillPassivate(HttpSessionEvent arg0) { // TODO Auto-generated method stub } @Override public void attributeAdded(HttpSessionBindingEvent arg0) { // TODO Auto-generated method stub // acivateusercount++; Object ob = arg0.getName(); if(ob!=null && "user".equals(ob.toString())){ acivateusercount++; System.out.println("attributeAdded user: "+ ((User)arg0.getValue()).getUserId()); System.out.println("online count: " + getactivated() ); } // } @Override public void attributeRemoved(HttpSessionBindingEvent arg0) { // TODO Auto-generated method stub Object ob = arg0.getName(); if(ob!=null && "user".equals(ob.toString())){ if(acivateusercount>0)acivateusercount--; System.out.println("attributeRemoved user: "+ ((User
)arg0.getValue()).getUserId());System.out.println("online count: " + getactivated() );}}@Overridepublic void attributeReplaced(HttpSessionBindingEvent arg0) {// TODO Auto-generated method stub}}
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