Java web Session 监听类。

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public class SessionListener implements HttpSessionListener {static Logger log = Logger.getLogger(SessionListener.class.getName());    private static Map<String, HttpSession> map = new               HashMap<String, HttpSession>();  static private int sessionCount = 0;    public void sessionCreated(HttpSessionEvent event) {        String id = event.getSession().getId();              log.debug("session created : " + id);          synchronized (this) {            sessionCount++;            map.put(id, event.getSession());        }        log.info("Session Created: " + event.getSession().getId());       log.info("Total Sessions: " + sessionCount);    }     public void sessionDestroyed(HttpSessionEvent event) {        synchronized (this) {            sessionCount--;        }        log.info("Session Destroyed: " + event.getSession().getId());        log.info("Total Sessions: " + sessionCount);    }    public static HttpSession getHttpSession(String sessionID)      {          return map.get(sessionID);      }}

in web.xml

 <listener><listener-class>com.ipcs.listener.SessionListener</listener-class>  </listener>

参考页面：http://www.coderanch.com/t/365859/Servlets/java/session-object-session-ID

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