注释作为另一个注释的快捷方式? [英] Annotation as shortcut for another annotation?

问题描述

如何创建一个注解，例如@DateOutput 等价于另一个Jackson注解，例如:

How can I create an annotation, such as @DateOutput that is equivalent with another Jackson annotation, such as:

@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd'T'HH:mm:ss.SSSZ", timezone="UTC")

或者理想情况下，对一组注释，例如

Or ideally, to a set of annotations, such as

@JsonSerialize(using = XSerializer.class)
@JsonDeserialize(using = XDeserializer.class)

推荐答案

您可以使用 @JacksonAnnotationsInside 作为注释容器，如下所示:

You can use @JacksonAnnotationsInside as a annotation container like follows:

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
@JacksonAnnotationsInside
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd'T'HH:mm:ss.SSSZ", timezone="UTC")
public @interface DateOutput {
}

并使用它来注释类中的字段，如下所示:

and use it to annotate the field in your class like so:

public class Foo {

   @DateOutput
   private Date date;

}

您还可以在单​​个注释下捆绑一组注释:

You can also bundle a set of annotations under a single annotation:

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
@JacksonAnnotationsInside
@JsonSerialize(using = XSerializer.class)
@JsonDeserialize(using = XDeserializer.class)
public @interface MyAnnotation {
}

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