abruptexitlistener.java

oa办公系统

package cn.jx.ecjtu.oa.servlets;
/**
 * created by yuankai,胡楚斌,李春鹏
 * */
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import cn.jx.ecjtu.oa.common.Constant;
import cn.jx.ecjtu.oa.ps.pojo.LoginUser;
import cn.jx.ecjtu.oa.services.OnlineList;
import cn.jx.ecjtu.oa.services.ServiceFactory;
import cn.jx.ecjtu.oa.services.SysUserService;

public class AbruptExitListener implements HttpSessionListener {
	private SysUserService service;    //使用到的SysUserService的对象
	
	public AbruptExitListener() {
		super();
		service=(SysUserService)ServiceFactory.getService(SysUserService.class);    
	}
	public void sessionCreated(HttpSessionEvent event) {
		// TODO Auto-generated method stub
		
	}
  /**
   * @TODO: 当一个用户突然退出系统的时候
   */
	public void sessionDestroyed(HttpSessionEvent event) {
		
		HttpSession session=event.getSession();
		String session_id=session.getId();
		ServletContext context=session.getServletContext();
		OnlineList list=(OnlineList) context.getAttribute(Constant.ONLINELIST_IN_APPLICATION);
		System.out.println("一个用户突然退出 或者超时！"+session_id+"\n");
		if(null!=list)
		{
			LoginUser user=list.findBySessionID(session_id);
			if(null!=user)
			{	
				service.modifyOnlineTime(user);	    //更新数据库中该用户的在线时长
			    list.removeOnlineUser(user);        //从application的在线列表中把这个用户移出
			    context.setAttribute(Constant.ONLINELIST_IN_APPLICATION, list);
			    
			}
		}
		
	}

}