jsp(对session监听）

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1:jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML>
<html>
<head>
<title>对Application监听</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<%
session.setAttribute("info", "监听器");
%>
<%
session.removeAttribute("info");
%>
</body>

</html>

2：listener(监听器）

package cn.com.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;

public class HttpSessionAttributeListenerDemo implements
HttpSessionAttributeListener {

@Override
public void attributeAdded(HttpSessionBindingEvent event) {

System.out.println("**增加属性-->属性名称:"+event.getName()+",属性内容:"+event.getValue());
}

@Override
public void attributeRemoved(HttpSessionBindingEvent event) {

System.out.println("**替换属性属性-->属性名称:"+event.getName()+",属性内容:"+event.getValue());
}

@Override
public void attributeReplaced(HttpSessionBindingEvent event) {
System.out.println("**删除属性-->属性名称:"+event.getName()+",属性内容:"+event.getValue());

}

}

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