Java类获取Request对象的几种方式

【方式一】通过注解获取【推荐】

public class Hello {

	@Autowired
	Private HttpServletRequest request;
	
}

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【方式二】通过监听获取

1、在web.xml中配置一个监听

<listener>
	<listener-class>
		org.springframework.web.context.request.RequestContextListener
	</listener-class>
</listener>

2、调用API获取

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

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【方式三】通过参数中传递【不推荐】

public String hello(HttpServletRequest request)

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【方式四】如果有Struts

HttpServletRequest request = ServletActionContext.getRequest();