拦截Controller方法，获取方法的注解信息_javaagent 拦截controller注解-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_37951410/article/details/106249011

本文介绍了如何在Spring框架下利用AOP（面向切面编程）来拦截Controller层的方法，并详细阐述了如何获取被拦截方法上的注解信息，以便进行动态逻辑控制或日志记录等操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

@Slf4j
@Aspect
@Component
public class ApiOperationAspect extends StaticMethodMatcherPointcutAdvisor implements MethodInterceptor {

    @Override
    public Advice getAdvice() {
        return this;
    }

    @Override
    public ClassFilter getClassFilter() {
        return clazz -> AnnotatedElementUtils.hasAnnotation(clazz, Controller.class) ||
                AnnotatedElementUtils.hasAnnotation(clazz, RestController.class);
    }

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        log.info("{}", "开始执行我的方法。。。。。");
		
		// @ApiOperation是swagger的API注解
        ApiOperation apiOperation = MyAnnotationUtil.getMethodAnnotation(invocation.getMethod(), ApiOperation.class);
        if (apiOperation != null) {
            log.info("value={}", apiOperation.value());
    }

        return invocation.proceed();
    }

    @Override
    public boolean matches(Method method, Class<?> aClass) {
        return MyAnnotationUtil.getMethodAnnotation(method, ApiOperation.class) != null;
    }

}

public final class MyAnnotationUtil{
    private MyAnnotationUtil(){
    }
    
    private static MyAnnotationHelper annotationHelper = new MyAnnotationHelper();

    /**
     * 获取方法注解，会递归接口和父类
     */
    public static <T extends Annotation> T getMethodAnnotation(Method method, Class<T> annotationClass) {
        return annotationHelper.getMethodAnnotation(method, annotationClass);
    }
}

final class MyAnnotationHelper {
	private ConcurrentMap<AnnotationCacheKey, Annotation> cache;
	
	MyAnnotationHelper () {
        cache = new ConcurrentHashMap<>();
    }
    
	@SuppressWarnings("unchecked")
    public <T extends Annotation> T getMethodAnnotation(Method method, Class<T> annotationClass) {
        return (T) cache.computeIfAbsent(new AnnotationCacheKey(method, annotationClass), key-> computeMethodAnnotation(method, annotationClass));
    }
}