onlinecounterlistener.java

有简单的网上书店需求及设计流程

package org.wiely.listener;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.wiely.model.OnlineCounter;

public class OnlineCounterListener implements HttpSessionListener {

	@Override
	public void sessionCreated(HttpSessionEvent arg0) {
		System.out.println("SessionEvent !!!!!!"+arg0);
		
		
		OnlineCounter.raise();
		
		System.out.println("Counter is raise");

	}

	@Override
	public void sessionDestroyed(HttpSessionEvent arg0) {
		OnlineCounter.reduce();
		System.out.println("Counter is reduce");
	}

}