HandlerInterceptorAdapter and Zuul Filter

问题:

It is possible add a HandlerInterceptorAdapter with Zuul Configuration. I need to intercept a request to a specific resource but I suppose because I have Zuul filter configuration, the interceptor is never called.

Is possible to do so?

回答1:

I have tried to achieve the same. We have a few Spring MVC controllers and Zuul proxying. But I still wanted the same Interceptor to be used.

The problem here is that zuul runs in its own ZuulServlet, and does not pick up the interceptors from your MVC servlet. Spring Cloud: ZuulConfiguration.java configures ZuulHandlerMapping, which is the only place interceptors could be set, but it's not configurable. Thus you need a InstantiationAwareBeanPostProcessorAdapter to interfere with the bean creation, to set your interceptors after instantiaton, but before initialization (before the interceptors are initialized).

This did the trick for me:

@Configuration
@RequiredArgsConstructor
public class ZuulHandlerBeanPostProcessor extends InstantiationAwareBeanPostProcessorAdapter {

    @NonNull
    private final MyInterceptor myInterceptor;

    @Override
    public boolean postProcessAfterInstantiation(final Object bean, final String beanName) throws BeansException {

        if (bean instanceof ZuulHandlerMapping) {

            val zuulHandlerMapping = (ZuulHandlerMapping) bean;
            zuulHandlerMapping.setInterceptors(myInterceptor);
        }

        return super.postProcessAfterInstantiation(bean, beanName);
    }

}