实现HttpSessionAttributeListener类，来完成session的增改删功能

港控/mmm° 2022-06-11 08:45 139阅读 0赞

package com.starry.listenter;
    
    import java.util.Date;
    import javax.servlet.http.HttpSession;
    import javax.servlet.http.HttpSessionAttributeListener;
    import javax.servlet.http.HttpSessionBindingEvent;
    import javax.servlet.http.HttpSessionEvent;
    import javax.servlet.http.HttpSessionListener;
    /*
     * 
     */
    public class SessionListenter implements HttpSessionListener,HttpSessionAttributeListener {
    
    	@Override
    	public void sessionCreated(HttpSessionEvent arg0) {
    		String date=new Date().toLocaleString();
    		HttpSession session=arg0.getSession();
    		System.out.println(date+"   创建session，id:"+session.getId());
    	}
    
    	@Override
    	public void sessionDestroyed(HttpSessionEvent arg0) {
    		String date=new Date().toLocaleString();
    		HttpSession session=arg0.getSession();
    		System.out.println(date+"   销毁session，id:"+session.getId());
    
    	}
    	
    	//HttpSessionAttributeListener重写的方法
    	@Override
    	public void attributeAdded(HttpSessionBindingEvent arg0) {
    		System.out.println("添加属性name"+arg0.getName());
    		System.out.println("添加属性value"+arg0.getValue());
    	}
    	//HttpSessionAttributeListener重写的方法
    	@Override
    	public void attributeRemoved(HttpSessionBindingEvent arg0) {
    		System.out.println("删除属性name"+arg0.getName());
    		System.out.println("删除属性value"+arg0.getValue());
    	}
    	//HttpSessionAttributeListener重写的方法
    	@Override
    	public void attributeReplaced(HttpSessionBindingEvent arg0) {
    		System.out.println("替换属性name"+arg0.getName());
    		System.out.println("替换属性value"+arg0.getValue());
    	}
    
    }

配置界面

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
      <display-name>webday06homework</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
      </welcome-file-list>
    
      <listener>
      	<listener-class>com.starry.listenter.SessionListenter</listener-class> 
      </listener>
      
    </web-app>

网页打开界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <%
    //设置添加name信息
    session.setAttribute("name", "张三");
    //设置定时关闭
    session.setMaxInactiveInterval(5);
    %>
    </body>
    </html>

starry。每天进步一点点。

爱生活，爱java