request对象获取页面from中所有的元素，使用Enumeration类

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();
    Enumeration e=request.getParameterNames();
    HttpSession session=request.getSession(true);
    int i = 0;
    String name;
    Hashtable tbl = new Hashtable();
    while (e.hasMoreElements()) {
      name = (String) e.nextElement();
      if (name.charAt(name.length() - 1) != '1') {
        tbl.put(name, request.getParameter(name));  //根据名称取值
        i++;
      }
    }