public   void  doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
             throws  IOException, ServletException {       
        //init
            String vh_btn_login = ((HttpServletRequest)request).getParameter("btn_login");
            String vh_login     = ((HttpServletRequest)request).getParameter("login");
            String vh_pass      = ((HttpServletRequest)request).getParameter("pass");            
        //init_close
        authUser run =  new  authUser();
        run.init();        
        HttpSession _session = ((HttpServletRequest)request).getSession(true);
         if  (_session.isNew()) {
             if  (vh_btn_login ==  null ){
                ((HttpServletResponse)response).sendRedirect("login.jsp");
            } else {
                int  _id_user = run.authorize(vh_login, vh_pass);
                if  (_id_user ==  0 ){
                    ((HttpServletResponse)response).sendRedirect("login.jsp");            
               } else {
                    run.addSession(_id_user, _session.getId(), _session.getCreationTime(), _session.getLastAccessedTime());
               }
            }
        } else {
            boolean  flag = run.clearSession(_session.getId(), _session.getLastAccessedTime());
            if  (flag){
                ((HttpServletResponse)response).sendRedirect("login.jsp");                 
           } else {
                run.updateSession(_session.getId(), _session.getLastAccessedTime());
           }            
        }
       chain.doFilter(request, response);  
    }