java类中的重定向无法访问地址

Question

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"); //转发 //req.getRequestDispatcher("main.jsp").forward(req, res); System.out.println("doFilter....end"); }用的火狐浏览器，一直说输入的没有找到此网站，错误信息http 404 ,所以我后面的error.jsp都完全不起作用的。。

Answer 1

输出req.getContextPath()+"/middle.jsp"看下，按照目录能否找到页面。