HttpServletResponse response = ServletActionContext.getResponse();
HttpServletRequest request= ServletActionContext.getRequest();
response.setStatus(HttpServletResponse.SC_NOT_FOUND); //可设置自己需要的值
try {
request.getRequestDispatcher("/404.htm").forward(request,response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}