用戶登陸問題，session.invalidate銷毀session

• 博客分類：?
• java

JavaApacheStrutsTomcatServlet? 用戶第一次登陸，可以登陸，點退出，調(diào)用session.invalidate，然后再次登陸，正常登陸，然后再點退出，這是第二次點退出第三次進行登陸，這時在登陸的時候就會報錯了，java.lang.IllegalStateException: invalidate: Session already invalidated?
全部異常為：?

2007-12-24 15:56:00 org.apache.catalina.core.StandardWrapperValve invoke?
嚴重: Servlet.service() for servlet action threw exception?
java.lang.IllegalStateException: invalidate: Session already invalidated?
??? at org.apache.catalina.session.StandardSession.invalidate(StandardSession.java:1086)?
??? at org.apache.catalina.session.StandardSessionFacade.invalidate(StandardSessionFacade.java:149)?
??? at struts.form.SessionDestroy.setSession(SessionDestroy.java:34)?
??? at struts.form.UserLoginForm.validate(UserLoginForm.java:41)?
??? at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:928)?
??? at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:204)?
??? at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)?
??? at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)?
??? at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)?
??? at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)?
??? at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)?
??? at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)?
??? at struts.form.FilterEncoding.doFilter(FilterEncoding.java:51)?
??? at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)?
??? at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)?
??? at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)?
??? at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)?
??? at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)?
??? at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)?
??? at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)?
??? at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)?
??? at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)?
??? at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
??? at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)?
??? at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)?
??? at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)?
??? at java.lang.Thread.run(Thread.java:595)?


這個原因我一開始還以為是超時了什么的呢，后來經(jīng)測試才知道，是因為用了session.invalidate()，session.invalidate的銷毀是把這個session所帶的用戶徹底的銷毀，這個session跟用戶已經(jīng)緊密聯(lián)合在一起，所以就一起銷毀了，這樣就算換了個session，也是登陸不了的，以前我的代碼就是這樣寫的，下面：?

Java代碼??

((HttpSession)?sc.getAttribute(userName)).invalidate();//?清除第一次登陸的session???

這樣銷毀的可是userName啊，所以要注意，銷毀session的時候絕對不能用這種形式，可以用下面的銷毀來控制用戶沒有登陸的話不可以瀏覽網(wǎng)頁和后退也不能進行操作，把上邊的代碼改成下邊的一句就搞定：?
???????? Java代碼??

session.removeAttribute("sessionUserName");??

移除用戶，但session不變，下次登陸的時候看到的sessionID還是一樣的?

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