Spring @RestController注解组合实现方法解析

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController {

	/**
	 * The value may indicate a suggestion for a logical component name,
	 * to be turned into a Spring bean in case of an autodetected component.
	 * @return the suggested component name, if any (or empty String otherwise)
	 * @since 4.0.1
	 */
	@AliasFor(annotation = Controller.class)
	String value() default "";

}

/**
 * @author Fcb
 * @date 2020/6/23
 * @description
 */
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyComponent {
}

/**
 * @author Fcb
 * @date 2020/6/23
 * @description
 */
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@MyComponent
public @interface MyController {
}

@MyController
public class AnnotatedService {
}

/**
 * @author Fcb
 * @date 2020/6/23
 * @description
 */
public class Test {

  public static void main(String[] args) {
    Annotation[] annotations = AnnotatedService.class.getAnnotations();
    for (Annotation anno : annotations) {
      System.out.println(anno.annotationType());
      System.out.println(anno.annotationType() == MyComponent.class);
    }
  }
}

/**
 * @author Fcb
 * @date 2020/6/23
 * @description
 */
public class Test {

  public static void main(String[] args) {
    Annotation[] annotations = AnnotatedService.class.getAnnotations();
    System.out.println(AnnotationUtils.findAnnotation(AnnotatedService.class, MyComponent.class));
  }
}

/**
 * @author Fcb
 * @date 2020/6/23
 * @description
 */
public class Test {

  public static void main(String[] args) {
    Annotation[] annotations = AnnotatedService.class.getAnnotations();
    System.out.println(AnnotationUtils.findAnnotation(AnnotatedService.class, OtherAnno.class));
  }
}