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(); 

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