首页 » Java » Java根据sessionId获取Session对象

Java根据sessionId获取Session对象

2016-03-14 12:10:09阅读(444)

1. 建立一个自己的SessionContext:

package com.shendd.session;

import Javax.servlet.http.HttpSession;
import java.util.HashMap;

public class MySessionContext {
	private static MySessionContext instance;
	private HashMap mymap;

	private MySessionContext() {
		mymap = new HashMap();
	}

	public static MySessionContext getInstance() {
		if (instance == null) {
			instance = new MySessionContext();
		}
		return instance;
	}

	public synchronized void AddSession(HttpSession session) {
		if (session != null) {
			mymap.put(session.getId(), session);
		}
	}

	public synchronized void DelSession(HttpSession session) {
		if (session != null) {
			mymap.remove(session.getId());
		}
	}

	public synchronized HttpSession getSession(String session_id) {
		if (session_id == null)
			return null;
		return (HttpSession) mymap.get(session_id);
	}

}

2.新建一个Session监听

package com.shendd.session;

import javax.servlet.http.HttpSessionListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;

public class SessionListener implements HttpSessionListener {
	public static Map userMap = new HashMap();
	private MySessionContext myc = MySessionContext.getInstance();

	public void sessionCreated(HttpSessionEvent httpSessionEvent) {
		myc.AddSession(httpSessionEvent.getSession());
	}

	public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
		HttpSession session = httpSessionEvent.getSession();
		myc.DelSession(session);
	}
}

3.在web.xml中配置

<span style="white-space:pre">	</span><!-- session监听 -->
 	<listener>
	<span style="white-space:pre">	</span><listener-class>com.hikvision.msp.session.SessionListener</listener-class>
	</listener>

4.使用

MySessionContext myContext= MySessionContext.getInstance();
HttpSession session = <span style="font-family: 宋体;">myContext</span><span style="font-family: 宋体;">.getSession(sessionId);</span>


最新发布

CentOS专题

关于本站

5ibc.net旗下博客站精品博文小部分原创、大部分从互联网收集整理。尊重作者版权、传播精品博文,让更多编程爱好者知晓!

小提示

按 Ctrl+D 键,
把本文加入收藏夹