public boolean isHasSysUser()throws NoSuchUserException{
        Session session = null;
        //HttpSession session=ServletActionContext.getRequest().getSession();
        try{
            session = Hibernate_Utils.getSession();
            session.createSQLQuery("select t.id from T_MENU t where t.id=1").executeUpdate();
            System.out.println("=====第二步：用户已经存在");
            return true;
        }catch(Exception e){
            System.out.println("=====第二步：用户不存在");
            throw new NoSuchUserException();
        }finally{
                session.close();
        }
    }