java 获取 sessionid_通过sessionid获取session方法

使用HttpSessionListener来监听session的创建和销毁,首先创建HttpSessionListener的实现类

SessionListeners.java

packagecom.test

importjava.util.HashMap;

importjava.util.Map;

importjavax.servlet.http.HttpSession;

importjavax.servlet.http.HttpSessionEvent;

importjavax.servlet.http.HttpSessionListener;

publicclassSessionListener implementsHttpSessionListener

{

private static int count= 0;

//存放session的集合类    private static Map map= newHashMap();

public voidsessionCreated(HttpSessionEvent event)

{

HttpSession session = event.getSession();

String sessionId = session.getId();

//System.out.println("Create a session:" + sessionId);

map.put(sessionId, session);

count++;

}

public void sessionDestroyed(HttpSessionEvent event)

{

count