Java根据sessionId获取Session对象

1. 建立一个自己的SessionContext：

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程序代码：

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package com.session.core;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);    }}

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2.新建一个Session监听

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程序代码

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package com.session.core;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);    }}

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3.在web.xml中配置

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程序代码

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<listener>    <listener-class>cn.org.jshuwei.session.core.SessionListener</listener-class></listener>

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4.使用

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程序代码

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MySessionContext myc= MySessionContext.getInstance();HttpSession sess = myc.getSession(sessionId);

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