The function I want to achieve is that if there is an annotation on class that requires user verification, then the method inside does not need to write this annotation one by one.
If method has written annotations, the method shall prevail.

After checking, I found that most articles talk about how to obtain the annotations on method, but not how to obtain the annotations on class.
Please God give me a piece of code.

Combined with the adopted answer, the complete code is as follows:

private AuthType getAuthType(ProceedingJoinPoint pj) {
        // 获取切入的 Method
        MethodSignature joinPointObject = (MethodSignature) pj.getSignature();
        Method method = joinPointObject.getMethod();

        boolean flag = method.isAnnotationPresent(AuthTarget.class);
        if (flag) {
            AuthTarget annotation = method.getAnnotation(AuthTarget.class);
            return annotation.value();
        } else {
            // 如果方法上没有注解，则搜索类上是否有注解
            AuthTarget classAnnotation = AnnotationUtils.findAnnotation(joinPointObject.getMethod().getDeclaringClass(), AuthTarget.class);
            if (classAnnotation != null) {
                return classAnnotation.value();
            } else {
                return null;
            }
        }
    }