Spring配置RequestContextListener可以在任何地方得到HttpRequest对象。

get_request_by_request_context.java

//在任意的class下通过以下方法获取到HttpServletRequest
HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();

spring_request_context_listener.xml

<!-- WEB.XML中配置相关的监听机制 -->
<listener>
  <listener-class>
      org.springframework.web.context.request.RequestContextListener
  </listener-class>
</listener>