In a Spring-mvc interceptor, how can I access to the handler controller method?

Question

In a Spring-mvc interceptor I want to access to the handler controller method

public class CustomInterceptor implements HandlerInterceptor  {
    public bool         


        

Answer 1

You can cast the Object handler to HandlerMethod.

HandlerMethod method = (HandlerMethod) handler;

Note however that the handler argument passed to preHandle is not always a HandlerMethod (careful with ClassCastException). HandlerMethod then has methods you can use to get annotations, etc.

Answer 2

HandlerInterceptors will only provide you access to the HandlerMethod IF you have registered your interceptors like so :

@EnableWebMvc
@Configuration
public class InterceptorRegistry extends WebMvcConfigurerAdapter {

    @Override
    public void addInterceptors(org.springframework.web.servlet.config.annotation.InterceptorRegistry registry) {
        registry.addInterceptor(new InternalAccessInterceptor());
        registry.addInterceptor(new AuthorizationInterceptor());
    }

}

In all other cases, the handler object will point to the controller. Most documentation on the web seemed to have missed this subtle point.