如何在 Spring MVC 中獲取 HttpServletRequest？

Question

如何在 Spring MVC 中獲取 HttpServletRequest？

嘗試獲取 HttpServletRequest 時，出現異常。

消息No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request. No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

請告訴我如何解決這個問題？

    @Component
    public class AuthenticationSuccessEventListener implements ApplicationListener<AuthenticationSuccessEvent> {


        @Autowired
        private HttpServletRequest request;


        @Override
        public void onApplicationEvent(AuthenticationSuccessEvent a) {
            
            System.out.println(request.getRemoteAddr());
            
        }

    }

Answer 1

您不應該在您的切面中自動裝配 HttpServletRequest，因為這會將您的切面綁定為只能對從正在執行的 HttpServletRequest 中調用的類運行。

而是在需要時使用 RequestContextHolder 來獲取請求。

 private String getRemoteAddress() { RequestAttributes attribs = RequestContextHolder.getRequestAttributes(); if (attribs instanceof NativeWebRequest) { HttpServletRequest request = (HttpServletRequest) ((NativeWebRequest) attribs).getNativeRequest(); return request.getRemoteAddr(); } return null; }

https://stackoverflow.com/a/24029989/11985558

Answer 2

你能試試這個

RequestAttributes reqAtt = RequestContextHolder.getRequestAttributes();
if (RequestContextHolder.getRequestAttributes() != null) {
    HttpServletRequest req = ((ServletRequestAttributes) reqAtt).getRequest();
    return req.getRemoteAddr();
}

您還需要在 web.xml 文件中添加/注冊 RequestContextListener 偵聽器。

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