java - 在 Spring MVC 的 ClientHttpRequestInterceptor 中访问 HttpSession

Question

我使用 @Autowired 访问 Spring MVC Controller 中的 session ，如下所示:

@Autowired
private HttpSession session;

问题是，我现在可以在 ClientHttpRequestInterceptor 中访问 session 。

我尝试使用 RequestContextHolder.getRequestAttributes() 但结果是(有时 - 这是一个真正的问题)null。我也用 RequestContextHolder.currentRequestAttributes() 尝试过，但是 IllegalStateException 抛出以下消息:

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/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

RequestContextListener在web.xml中注册。

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

当我直接在 ClientHttpRequestInterceptor 中注入(inject) session 时，同样的问题。

@Autowired
private HttpSession session;

我的问题是:如何访问 ClientHttpRequestInterceptor 中的当前 HttpSession？

谢谢!

Answer 1

您可以在 ClientHttpRequestInterceptor 中使用以下内容来访问 HttpSession:

public class CustomInterceptor implements ClientHttpRequestInterceptor {
        @Override
        public ClientHttpResponse intercept(HttpRequest request,
                                            byte[] body,
                                            ClientHttpRequestExecution execution) throws IOException {
            HttpServletRequest httpServletRequest = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
            // get the current session without creating a new one
            HttpSession httpSession = httpServletRequest.getSession(false);
            // get whatever session parameter you want
            String sessionParam = httpSession.getAttribute("parameter")
                                             .toString();
        }
    }