定时销毁session

Posted 2020-09-28 殷瑜泰

通过使用监听定时器，来定时销毁session

demo：

public class MyServletContextListener implements ServletContextListener {     public void contextInitialized(ServletContextEvent sce) { //通过事件源对象得到事件源（ServletContext） ServletContext application = sce.getServletContext(); //创建一个集合用于存储所有session对象 final List<HttpSession> list =Collections.synchronizedList(new ArrayList<HttpSession>());     //把集合放到application域中 application.setAttribute("sessions", list);     //创建一个计时器对象 Timer t = new Timer();     t.schedule(new TimerTask() {     @Override public void run() { System.out.println("开始扫描了。。。"); for (Iterator iterator = list.iterator(); iterator.hasNext();) { HttpSession session = (HttpSession) iterator.next(); long l = System.currentTimeMillis()-session.getLastAccessedTime(); if(l>5000){//如果时间大于5秒，把session销毁 System.out.println("session移除了"+session.getId()); session.invalidate();//把session销毁 //list.remove(session);//从集合中移除 iterator.remove(); }     } /*for (HttpSession session : list) { long l = System.currentTimeMillis()-session.getLastAccessedTime(); if(l>5000){//如果时间大于5秒，把session销毁 session.invalidate();//把session销毁 list.remove(session);//从集合中移除 } }*/ } }, 2000, 5000);//延迟2秒后执行，每间隔5秒执行一次 }     public void contextDestroyed(ServletContextEvent sce) {     }     }

public class MySessionListener implements HttpSessionListener {     public void sessionCreated(HttpSessionEvent se) { HttpSession session = se.getSession(); //得到application对象中的list集合 ServletContext application = session.getServletContext(); //得到session对象，并放入到list集合中 List<HttpSession> list = (List<HttpSession>) application.getAttribute("sessions");     list.add(session); System.out.println("添加了"+session.getId()); }     public void sessionDestroyed(HttpSessionEvent se) { // TODO Auto-generated method stub     }     }