问如何从Servlet重定向到JSP文件

EN

   protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
      request.getRequestDispatcher("/upload.jsp").forward(request, response);
    } 

@RequestMapping(value = "/user_list")
public String users(HttpServletResponse response, HttpServletRequest request)
{
    //some function to verify access
    boolean authorized = client.getAccess(); 
    request.setAttribute("authorized", authorized);

    if (authorized)
    {
        List<User> users = UserDAO.geUsers();

        request.setAttribute("users", users);
        return "user_list";
    }
    else
    {
        return "access_denied";
    }
}

@RequestMapping(value = "/create_user", method = RequestMethod.POST)
public String add_user(HttpServletResponse response, HttpServletRequest request)
{

    boolean authorized = client.getAccess();
    if (authorized)
    {
        User user = new User();

            user.setUserName(request.getParameter("username"));
            user.setFullName(request.getParameter("fullname"));

        if (UserDAO.saveUser(user))
        {
            return "redirect:/user_list";
        }
        else
        {
            return "error";
        }
    }
    else
    {
        return "access_denied";
    }
}