public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO Auto-generated method stub System.out.println("doFilter....start"); //chain.doFilter(request, ?response); HttpServletRequest req =(HttpServletRequest) request; HttpServletResponse res = (HttpServletResponse)response; //重定向 res.sendRedirect(req.getContextPath()+"/middle.jsp"); //轉發 //req.getRequestDispatcher("main.jsp").forward(req, res); System.out.println("doFilter....end"); }用的火狐瀏覽器，一直說輸入的沒有找到此網站，錯誤信息http 404 ,所以我后面的error.jsp都完全不起作用的。。