spring提供的RequestContextHolder在非contrller层获取request和response对象

HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();

HttpServletResponse response = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getResponse();

HttpServletResponse response = ((ServletWebRequest)RequestContextHolder.getRequestAttributes()).getResponse();

ServletContext context = ContextLoader.getCurrentWebApplicationContext().getServletContext();