SpringMVC 获取 Request 和 Response

SpringMVC 中在任意地方取得 HttpServletRequest 和 HttpServletResponse

1. 在 web.xml 中注册 RequestContextListener (SpringMVC 4 不需要这一步)

   <listener>  
       <listener-class>  
           org.springframework.web.context.request.RequestContextListener  
       </listener-class>  
   </listener>

2. 获取 HttpServletRequest 和 HttpServletResponse

   public static String testRequestAndResponse() {
       HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
       HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();
       
       return request.getParameter("name");
   }