myrequestlistener.java

该代码是《JSP应用与开发实例》一书的配套光盘

package com.jspdev.ch8;

import javax.servlet.*;

public class MyRequestListener 
implements ServletRequestListener,ServletRequestAttributeListener
{
	//ServletRequestListener
	public void requestDestroyed(ServletRequestEvent sre) 
	{
		logout("request destroyed");
	}
	
	public void requestInitialized(ServletRequestEvent sre) 
	{
		logout("request init");
		ServletRequest sr=sre.getServletRequest();
		  
		if(sr.getRemoteAddr().startsWith("127")) sr.setAttribute("isLogin",new Boolean(true));
		else sr.setAttribute("isLogin",new Boolean(false));
		
		
	}//ServletRequestListener
	
	//ServletRequestAttributeListener
	public void attributeAdded(ServletRequestAttributeEvent event) 
	{
	    logout("attributeAdded('" + event.getName() + "', '" +
	    event.getValue() + "')");
	}
	public void attributeRemoved(ServletRequestAttributeEvent event) 
	{
		logout("attributeRemoved('" + event.getName() + "', '" +
	    event.getValue() + "')");

	}
	
	public void attributeReplaced(ServletRequestAttributeEvent event)
	{
		logout("attributeReplaced('" + event.getName() + "', '" +
	    event.getValue() + "')");
		
	}//ServletRequestAttributeListener
	private void logout(String msg)
	{
		java.io.PrintWriter out=null;
		try
		{
			out=new java.io.PrintWriter(new java.io.FileOutputStream("c:\\request.txt",true));
		    out.println(msg);
		    out.close();
		 }
		 catch(Exception e)
		 {
		 	out.close();
		 }		  
	}	
}