我们都只到RequestContextHolder是Spring提供的可以获取HttpServletRequest的一个工具，于是我在工作中就自己封装了一个工具类如下
import javax.servlet.http.HttpServletRequest; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; /** * request上下文工具类 * * @author chunhui.tan * @version 创建时间：2018年10月8日 下午2:48:22 */ public class HttpContextUtils { public static HttpServletRequest getHttpServletRequest() { return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); } public static String getDomain() { HttpServletRequest request = getHttpServletRequest(); StringBuffer url = request.getRequestURL(); return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString(); } public static String getOrigin() { HttpServletRequest request = getHttpServletRequest(); return request.getHeader("Origin"); } }但是在调用这个工具获取HttpServletRequest的时候报了空指针异常，经过排查是RequestContextHolder.getRequestAttributes()获取到的ServletRequestAttributes为null 参照这两篇文章： SpringMVC之RequestContextHolder分析 spring boot 如何配置RequestContextListener 最后在启动类中加入以下代码即可解决报空指针的问题
@Bean public RequestContextListener requestContextListener(){ return new RequestContextListener(); }