package org.it315.listener;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class CountListener implements HttpSessionListener 
{
	private int count = 0; //用于統(tǒng)計(jì)在線人數(shù)的變量
	public void sessionCreated(HttpSessionEvent hse) 
	{
		count++; //session對象創(chuàng)建時count加1
		ServletContext context = hse.getSession().getServletContext();
		context.setAttribute("count",new Integer(count));
	}
	public void sessionDestroyed(HttpSessionEvent hse) 
	{
		count--; //session對象銷毀時count減1
		ServletContext context = hse.getSession().getServletContext();
		context.setAttribute("count",new Integer(count));
	}
}