过滤器的问题!

Question

  在JBuilder里加了一个Filter Servlet    运行时为什么会把图片都过滤掉了.图片都显示不出来.    请问怎么才能把图片显示出来

Answer 1

public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        boolean valid = false;
        HttpServletRequest hres = (HttpServletRequest)request;
        HttpSession session = hres.getSession();
        
        try {
            if((session!= null)&&(session.getAttribute("userName")!=null))
                valid = true;
            if(valid)
            {
                filterChain.doFilter(request, response);
            }
            else
            {
                request.getRequestDispatcher("/Login.jsp").forward(request,response);
            }
        } catch (ServletException sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }