1.通过注解获取（很简单，推荐）：
public class Hello {
@Autowired
HttpServletRequest request; //这里可以获取到request
}
2.在web.xml中配置一个监听：
<listener>
<listener-class>
org.springframework.web.context.request.RequestContextListener
</listener-class>
</listener>
java代码：
HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
3.直接在参数中传递（此方法不好用，不建议使用）：
public String hello(HttpServletRequest request)
4.如果有Struts：
HttpServletRequest request = ServletActionContext.getRequest();
获取Response对象：
HttpServletResponse response = ((ServletWebRequest) RequestContextHolder.getRequestAttributes()).getResponse();