java - Spring AOP : @annotation() pointcut does not match type annotation

Question

我正在编写一个方面来记录 Controller 中每个 API 调用的请求和响应。我希望能够在类上使用此注释，因此使用 @Target(ElementType.TYPE)

之前我添加了@Target(ElementType.Method)，并且我在方法上使用了这个注释，并且工作正常。现在我想将其更改为 @Target(ElementType.TYPE)

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ReLogger {}

@Aspect
@Component
public class ReLoggerAspect {
    public static final Logger log = LoggerFactory.getLogger("ReLoggerAspect");

    @PostConstruct
    private void postConstruct() {
        log.info("ReLoggerAspect Created");
    }

    @Around("@annotation(ReLogger)")
    private Object reqLoggingAspect(ProceedingJoinPoint joinPoint) throws Throwable {
        log.info("Request {}",jointPoint.getArgs()[0);
    }
}

在类上使用@ReLoggerAspect

@RestController
@RequestMapping(value = "....", produces = { "application/json" })
@ReLogger
public class Samplecontroller {
    /** Some logic here**/.....
}

调用 API SampleController 时不会打印请求

Answer 1

您认为@annotation会匹配类型注释的前提是错误的，请参阅(Spring AOP手册](https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#aop-pointcuts-designators):

• @within: Limits matching to join points within types that have the given annotation (the execution of methods declared in types with the given annotation when using Spring AOP).

• @annotation: Limits matching to join points where the subject of the join point (the method being executed in Spring AOP) has the given annotation.

因此，您应该使用@within(completely.qualified.AnnotationType)。