Question

如何javaEE通过sessionId获取HttpSession对象

Answer 1

Servlet2.1之后不支持SessionContext里面getSession(Stringid)方法。但是，我们可以通过HttpSessionListener监听器和全局静态map自己实现一个SessionContext。MySessionContext.java:publicclassMySessionContext{privatestaticHashMapmymap=newHashMap();publicstaticsynchronizedvoidAddSession(HttpSessionsession){if(session!=null){mymap.put(session.getId(),session);}}publicstaticsynchronizedvoidDelSession(HttpSessionsession){if(session!=null){mymap.remove(session.getId());}}publicstaticsynchronizedHttpSessiongetSession(Stringsession_id){if(session_id==null)returnnull;return(HttpSession)mymap.get(session_id);}}MySessionListener.java:publicclassMySessionListenerimplementsHttpSessionListener{publicvoidsessionCreated(HttpSessionEventhttpSessionEvent){MySessionContext.AddSession(httpSessionEvent.getSession());}publicvoidsessionDestroyed(HttpSessionEventhttpSessionEvent){HttpSessionsession=httpSessionEvent.getSession();MySessionContext.DelSession(session);}}web.xml添加一个监听器：listener.MySessionListener根据sessionId获取Session对象：StringsessionId=request.getParameter("sessionId");HttpSessionsession=MySessionContext.getSession(sessionId);

Answer 2

Servlet2.1之后不支持SessionContext里面getSession(Stringid)方法。但是，我们可以通过HttpSessionListener监听器和全局静态map自己实现一个SessionContext。MySessionContext.java:publicclassMySessionContext{privatestaticHashMapmymap=newHashMap();publicstaticsynchronizedvoidAddSession(HttpSessionsession){if(session!=null){mymap.put(session.getId(),session);}}publicstaticsynchronizedvoidDelSession(HttpSessionsession){if(session!=null){mymap.remove(session.getId());}}publicstaticsynchronizedHttpSessiongetSession(Stringsession_id){if(session_id==null)returnnull;return(HttpSession)mymap.get(session_id);}}MySessionListener.java:publicclassMySessionListenerimplementsHttpSessionListener{publicvoidsessionCreated(HttpSessionEventhttpSessionEvent){MySessionContext.AddSession(httpSessionEvent.getSession());}publicvoidsessionDestroyed(HttpSessionEventhttpSessionEvent){HttpSessionsession=httpSessionEvent.getSession();MySessionContext.DelSession(session);}}web.xml添加一个监听器：listener.MySessionListener根据sessionId获取Session对象：StringsessionId=request.getParameter("sessionId");HttpSessionsession=MySessionContext.getSession(sessionId);

Answer 3

你要获取 session吗 request.getSession（）这样是获取session的sessionId是什么意思

Answer 4

战狼班JavaEE开班日期是十月十六日