session_counter.java

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package cn.aiqinzhe;  

import javax.servlet.*;  
import javax.servlet.http.*;  

public class Session_Counter implements HttpSessionListener 
{  

	private static int activeSessions = 0;  

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	public void sessionCreated(HttpSessionEvent se) 
	{  
		activeSessions++;  
	}  
	
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	public void sessionDestroyed(HttpSessionEvent se) 
	{  
		if(activeSessions > 0) 
		{
			activeSessions--;  
		} 		
	}  
	
	//��ȡ�������ֵ
	public static int getActiveSessions() 
	{  
		return activeSessions;  
	}  
}