1、拿到你当前session的id
request.getSession().getId();
2、写监听器(获得上下文sessionid存到一个map里,然后根据sessionid获得session)
MySessionContext.java: public class MySessionContext { private static HashMap mymap = new HashMap(); public static synchronized void AddSession(HttpSession session) { if (session != null) { mymap.put(session.getId(), session); } } public static synchronized void DelSession(HttpSession session) { if (session != null) { mymap.remove(session.getId()); } } public static synchronized HttpSession getSession(String session_id) { if (session_id == null) return null; return (HttpSession) mymap.get(session_id); } } MySessionListener.java: public class MySessionListener implements HttpSessionListener { public void sessionCreated(HttpSessionEvent httpSessionEvent) { MySessionContext.AddSession(httpSessionEvent.getSession()); } public void sessionDestroyed(HttpSessionEvent httpSessionEvent) { HttpSession session = httpSessionEvent.getSession(); MySessionContext.DelSession(session); } } web.xml添加一个监听器: <listener> <listener-class>listener.MySessionListener</listener-class> </listener> 3、根据sessionId获取Session对象: String sessionId = request.getParameter("sessionId"); HttpSession session = MySessionContext.getSession(sessionId);