Jsp 监听请求的两个监听器学习笔记

我们下面这个类，通过实现两个接口，从而我们这个类可以有多个作用(监听请求和请求范围内的属性的变化)

1.编写我们的类

<table width="620" align="center" border="0" cellpadding="1" cellspacing="1" style="background:#FB7"> <tr> <td width="464" height="27" bgcolor="#FFE7CE"> 代码如下</td> <td width="109" align="center" bgcolor="#FFE7CE" style="cursor:pointer;" onclick="doCopy('copy5987')">复制代码</td> </tr> <tr> <td height="auto" colspan="2" valign="top" bgcolor="#FFFFFF" style="padding:10px;" class="copyclass" id=copy5987>

package org.Rudiment.Listener;

import javax.servlet.ServletRequestAttributeEvent;
import javax.servlet.ServletRequestAttributeListener;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;

public class MyRequestListener implements ServletRequestListener, ServletRequestAttributeListener
{

    @Override
    public void attributeAdded(ServletRequestAttributeEvent arg0) {
        System.out.println("Request范围中的属性:" arg0.getName() " 被添加,数值为:" arg0.getValue());
    }

    @Override
    public void attributeRemoved(ServletRequestAttributeEvent arg0) {
        System.out.println("Request范围中的属性:" arg0.getName() " 被删除,数值为:" arg0.getValue());
    }

    @Override
    public void attributeReplaced(ServletRequestAttributeEvent arg0) {
        System.out.println("Request范围中的属性:" arg0.getName() " 数值更新为:" arg0.getValue());
    }

    @Override
    public void requestDestroyed(ServletRequestEvent arg0) {
        HttpServletRequest request = (HttpServletRequest)arg0.getServletRequest();
        System.out.println("请求即将结束"  );
    }

    @Override
    public void requestInitialized(ServletRequestEvent arg0) {
        HttpServletRequest request = (HttpServletRequest)arg0.getServletRequest();
        System.out.println("请求即将开始,请求来自" request.getHeader("Referer") "发向" request.getRequestURI());
    }

}

2.在web.xml 中配置我们的监听器

<table width="620" align="center" border="0" cellpadding="1" cellspacing="1" style="background:#FB7"> <tr> <td width="464" height="27" bgcolor="#FFE7CE"> 代码如下</td> <td width="109" align="center" bgcolor="#FFE7CE" style="cursor:pointer;" onclick="doCopy('copy8078')">复制代码</td> </tr> <tr> <td height="auto" colspan="2" valign="top" bgcolor="#FFFFFF" style="padding:10px;" class="copyclass" id=copy8078>

<listener>
    <listener-class>org.Rudiment.Listener.MyRequestListener</listener-class>
</listener>

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