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       private static TokenProcessor instance=new TokenProcessor();
       public static String FORM_TOKEN_KEY="FORM_TOKEN_KEY";
       private TokenProcessor(){
          
       }
       public static TokenProcessor getInstance(){
           return instance;
       }
       /**
        * ÑéÖ¤ÇëÇóÖеñêʶºÅÊÇ·ñÓÐЧ£¬Èç¹ûÇëÇóÖÐµÄ±íµ¥±êʶÓ뵱ǰÓû§sessionÖеÄÏàͬ£¬·µ»Ø½á¹ûtrue=
        */
       public synchronized boolean isTokenValid(HttpServletRequest request){
           //δ±ÜÃâsession¶ÔÏó²»´æÔÚʱºò´´½¨Session¶ÔÏó
           HttpSession session=request.getSession(false);
           if(session==null){return false;}
           String saved=(String)session.getAttribute(FORM_TOKEN_KEY);
           if(saved==null){
               return false;
           }
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