1. 編寫註解

@Target({ElementType.METHOD})
@Retention(RUNTIME)
public @interface Demo {

    String value() default "";

}

2. 編寫攔截器

public class DemoInteceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws
 
 Exception {

        HandlerMethod methodHandler = (HandlerMethod) handler;
        Demo demo = methodHandler.getMethodAnnotation(Demo.class);
        System.out.println(demo.value());
    }
}