//控制缓存时间
    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String str = "aaaaaaaaaaaa";

        response.setDateHeader("Expires",System.currentTimeMillis()+1*60*60*1000);//毫秒，控制缓存时间，相对于当前时间

        response.getWriter().write(str);

    }

//response的重定向

　　/*response.setStatus(302);
　　response.setHeader("Location", "/day08_00_response/01Login.html");*/
　　response.sendRedirect("/day08_00_response/01Login.html");