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通过重写HttpSessionListener接口实现
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | //session操作类 public class SessionMap { private static Map<String,HttpSession> sesMap = new HashMap<String,HttpSession>(); private static final Object flag = new Object(); private SessionMap(){ } private static class MapUtilsN{ private static SessionMap sessionMap = new SessionMap(); } public static SessionMap getInstance(){ return MapUtilsN.sessionMap; } public void addMap(String sessionId,HttpSession session){ synchronized (flag) { if (!sesMap.containsKey(sessionId)){ sesMap.put(sessionId, session); } } } public void removeMap(String sessionId){ synchronized (flag) { sesMap.remove(sessionId); } } public int getSize(){ synchronized (flag) { return sesMap.size(); } } public HttpSession getSession(String key){ synchronized (flag) { return sesMap.get(key); } } } //监听session创建及销毁 public class MySessionListner implements HttpSessionListener{ public void sessionCreated(HttpSessionEvent arg0) { SessionMap.getInstance().addMap(arg0.getSession().getId(), arg0.getSession()); } public void sessionDestroyed(HttpSessionEvent arg0) { SessionMap.getInstance().removeMap(arg0.getSession().getId()); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | //web.xml中配置监听器 <? xml version = "1.0" encoding = "UTF-8" ?> < web-app version = "2.5" xmlns = "http://java.sun.com/xml/ns/javaee" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> < welcome-file-list > < welcome-file >index.jsp</ welcome-file > </ welcome-file-list > <!-- 配置监听器 --> < listener > < listener-class > practice.listner.MySessionListner </ listener-class > </ listener > <!-- 设置session超时时间 --> < session-config > < session-timeout >10</ session-timeout > </ session-config > </ web-app > |