Servlet问题：forward跳转后，getAttribute无法读取 - 编程论坛

我有两个Servlet文件：req和rep; 在req中，用 request.getRequestDispatcher("rep").forward(request, response),跳转到了rep; 但是在rep中无法取出request中的数据。
在req中，代码如下：

程序代码：

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");

        request.setAttribute("aa","dp");
        request.getRequestDispatcher("rep").forward(request, response);

        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

在req中，代码如下:

程序代码：

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");

        out.println("跳转到RepServlet");
        String ss = (String) request.getAttribute("aa");
        System.out.println(ss);
        if (ss == null) {
            out.println("跳转不能从请求获得数据");
        }else {
            out.println(ss);
        }

        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

[ 本帖最后由 Alen0128 于 2011-11-3 19:20 编辑 ]