jsp(对request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>
<%
request.setAttribute("info1", "监听器1");
request.setAttribute("info2", "监听器2");
%>
<%
request.removeAttribute("info1");
request.removeAttribute("info2");
%>
</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.ServletRequestAttributeEvent;
import javax.servlet.ServletRequestAttributeListener;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletRequestAttibuteEvent implements
ServletRequestAttributeListener {

@Override
public void attributeAdded(ServletRequestAttributeEvent event) {
System.out.println("**增加属性-->属性名称:"+event.getName()+",属性内容:"+event.getValue());
}

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

}

}

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