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public String login(HttpServletRequest request){
   OperatorService operatorService = new OperatorService();
   WebContext webContext= request.getSession().getAttribute("WEB_CONTEXT_KEY");
Connection conn=null;
try{
      Conection conn =DBManager.getConnection();
       if(webContext.getOperatorName.equals("123")){
          // µÇ½³É¹¦
      }
}catch(Throwable t){
   //¼Ç¼ÈÕÖ¾
//Ìøתµ½Í³Ò»µÄ´íÎóÒ³Ãæ,²»ÄÜÈÃÓû§¿´µ½Òì³£Ò³Ãæ
       //¹Ø±ÕConnection
       if(conn!=null){
           try{conn.close();}cath(SQLException ex){}
     }
   }
}
public String logOut(HttpServletRequest request){
   OperatorService operatorService = new OperatorService();
   WebContext webContext= request.getSession().getAttribute("WEB_CONTEXT_KEY");
try{
       Conection conn =DBManager.getConnection();
        operatorService.logout();
      request.getSession().invalidate();
}catch(Throwable t){
   //¼Ç¼ÈÕÖ¾
//Ìøתµ½Í³Ò»µÄ´íÎóÒ³Ãæ,²»ÄÜÈÃÓû§¿´µ½Òì³£Ò³Ãæ
       //¹Ø±ÕConnection
       if(conn!=null){
           try{conn.close();}cath(SQLException ex){}
     }
   }
}
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public abstract class AppCallback {
    /**
    * »Øµ÷Ö´Ðз½·¨
    *
    * @return
    */
    public String execute() {
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