import javax.servlet.*;
import javax.servlet.http.*;
public final class Test2 implements HttpSessionListener {
    private int count = 1;
    private ServletContext context = null;

    public synchronized void sessionCreated(HttpSessionEvent se) {
    count++;
    se.getSession().setMaxInactiveInterval(30);//設(shè)置最長休眠時間,，單位秒
    log("sessionCreated(′" + se.getSession().getId() + " count="+count);
    se.getSession().setAttribute("count",new Integer(count));
    log("it's create time："+se.getSession().getCreationTime());    
   
    log("MaxInactiveTnterval："+se.getSession().getMaxInactiveInterval());//最大休眠時間,以秒為單位
    System.out.println(se.getSession().getId());
    System.out.println(se.getSession().getCreationTime());
    }

    public synchronized void sessionDestroyed(HttpSessionEvent se) {
    count--;
    se.getSession().setAttribute("count",new Integer(count));
    log("one session is time out or Destroyed!");

log("it's LastAccessedTime："+se.getSession().getLastAccessedTime());//和session創(chuàng)建時候的時間差就是在線時間

    }

    public int getCount() {
    return this.count;
    }

    public void addCount(){
    count++;
    }

    private void log(String message) {

    if (context != null)
        context.log("context is exists:SessionListener: " + message);
    else
        System.out.println("context is null:SessionListener: " + message);

     //沒有context存在就用系統(tǒng)輸出了

    }