如何确保控制器在 spring 引导中被特定注释注释?

How to make sure a controller is annotated by a specific annotation in spring boot?

@FeignClient@RequestMapping 无法添加到同一界面。现在我想检查这两个注释是否同时使用以给出一些错误消息。

问题:

spring 是否支持类似 isAnnotatedBy(Annotation annotation) 的方法?如果没有,我怎么能在这里实现我的目标?

谢谢!

已支持名为 isAnnotationPresent:

的方法
boolean isAnnotationPresent(Class<? extends Annotation> annotationClass)
Returns true if an annotation for the specified type is present on this element, else false. This method is designed primarily for convenient access to marker annotations.
Parameters:
annotationClass - the Class object corresponding to the annotation type
Returns:
true if an annotation for the specified annotation type is present on this element, else false
Throws:
NullPointerException - if the given annotation class is null
Since:
1.5

我怀疑您遇到了与此问题相关的问题 https://github.com/spring-cloud/spring-cloud-netflix/issues/466

spring applicationContext 提供实用方法来查找带有某些注释的 bean。

解决方案可能包括启动 applicationContext 并在那里搜索重叠注释。

为此,您需要注册一个 ApplicationListener,它会搜索您所有的 @RequestMapping bean,这些 bean 会进一步用 @FeignClient 进行注释。

实现可能如下所示:

@Component
public class ContextStartupListener
        implements ApplicationListener<ContextRefreshedEvent> {

    @Autowired    
    private ApplicationContext applicationContext;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event){
    for(String beanName : applicationContext.getBeanNamesForAnnotation(RequestMapping.class)) {
           if(applicationContext.findAnnotationOnBean(beanName, FeignClient.class)!=null){
                throw new AnnotationConfigurationException("Cannot have both @RequestMapping and @FeignClient on "+beanName);
            }
        }
    }
}