Small example of listeners: Use Httpsessionlistener and Httpservletcontextlistener to implement timed destruction httpsession

1. Create Myservletcontextlistener to implement Httpservletcontextlistener interface

@Override Public voidcontextdestroyed (Servletcontextevent sce) {} @Override Public voidcontextinitialized (Servletcontextevent sce) {//Create a list collection to hold all httpsession, must be locking for this collection (multi-threaded access)        FinalListNewArraylist()); //ServletContext Add this collectionSce.getservletcontext (). SetAttribute ("list", list); Timer Timer=NewTimer ();//class of time schedulingTimer.schedule (NewTimerTask () {//Scheduled Tasks@Override Public voidrun () {System.out.println ("Started scanning ... ");  for(Iterator Iterator =list.iterator (); Iterator.hasnext ();) {HttpSession HttpSession=(HttpSession) iterator.next (); //calculates the time that the session already exists (the current system time-httpsession the last access time)                    LongL=system.currenttimemillis ()-Httpsession.getlastaccessedtime (); //Remove session If survival time is greater than 10 seconds                    if(l>10000) {                        //invalidation, removing httpsesion from the collectionSYSTEM.OUT.PRINTLN ("Session Expired:" +Httpsession.getid ());                        Httpsession.invalidate ();                    Iterator.remove (); }                                }                        }            //delay: Start execution in seconds (sec)//period: Time between execution (seconds)}, 2000, 5000); }

2. Create Myhttpsessionlistener to implement Httpsessionlistener interface

    @Override    publicvoid  sessioncreated (httpsessionevent arg0) {         // when the server creates a httpsession, it adds HttpSession        to the list collection HttpSession HttpSession = arg0.getsession ();         = Httpsession.getservletcontext ();        List<HttpSession> list = (list);        System.out.println ("Session creation added" +Httpsession.getid ());        List.add (httpSession);    }

Note: To implement the listener interface, be sure to configure the Web. xml file

Small example of listeners: Use Httpsessionlistener and Httpservletcontextlistener to implement timed destruction httpsession