您可以将注释目标限制为某个类的子类吗? [英] Can you limit annotation target to be subclasses of a certain class?

问题描述

您能否限制注释的目标必须属于某个类?

Can you limit that a target of an annotation must be of a certain class?

我想创建一个新的验证约束来限制上传的文件类型.约束注释必须只在 MultipartFile 属性上，而不是在 String 或类似的东西上.我该如何限制?

I want to create a new validation Constraint to limit file types that are uploaded. The constraint annotation must only go on a MultipartFile property, not on String or anything like that. How do I limit this?

推荐答案

不在编译时；注释放置的唯一限制是元素类型(方法、类等).

Not at compile-time; the only restrictions available for annotation placement are by element type (method, class, etc.).

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