protected void doFilterInternal(HttpServletRequest request,

			HttpServletResponse response, FilterChain filterchain)

			throws ServletException, IOException {

		

		

	

		 // 不过滤的uri  

        String[] notFilter = new String[] { "login.jsp","login","plui","include",".css","testLoginServlet" };  

  

        // 请求的uri  

        String uri = request.getRequestURI();

  

        // uri中包含plattutor3时才进行过滤  

        if (uri.indexOf("plattutor3") != -1) {  

        	

            // 是否过滤  

            boolean doFilter = true;  

            for (String s : notFilter) {  

                if (uri.indexOf(s) != -1) {  

                	

                    // 如果uri中包含不过滤的uri，则不进行过滤  

                	System.out.println("session filter  不过滤__________");

                    doFilter = false;  

                    break;  

                }  

            }  

            if (doFilter) {  

	            if(request.getSession(false)==null){ 

	      			  

	    				System.out.println("session已经过期"); 

	    				response.sendRedirect("/plattutor3/tutor/test/login.jsp");

	    				

	    				

	    		}else{

	                // 执行过滤  

	                // 从session中获取登录者实体  

		              Object obj=  request.getSession(false).getAttribute("userInfo");  

		                if (null == obj) {  

		       &nb