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

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本文介绍了如何在Java中通过RequestContextHolder获取HttpServletRequest和HttpServletResponse对象的方法，并展示了如何从当前Web应用上下文中取得ServletContext实例。

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

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

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

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