如何实现`Jackson AnnotationIntrospector`？ [英] how to implement `Jackson AnnotationIntrospector`?

问题描述

我想创建两个自定义属性：

I want to create two custom attributes:

class A{

@IgnoreLevel("Debug") String str1;

@IgnoreLevel("Info") String str2;
}

或更喜欢这样：

class A{

@Debug String str1;

@Info String str2;
}

我想要写一个会使objectMapper忽略的配置

And I want the write a configuration that will make objectMapper to ignore

defug和info。另一种配置只在序列化和反序列化时忽略带有info的字段。

"defug" and "info". And another configuration to ignore fields with "info" only when serializing and de-serializing.

但是我读过的所有帖子（ post1 ， post2 ）不显示如何实现服装的示例配置 \ AnnotationIntrospector 。

but all the posts i have read (post1, post2) don't show an example how to implement costume configuration \ AnnotationIntrospector.

推荐答案

如果你想要子类 JacksonAnnotationIntrospector ，你只需要覆盖 hasIgnoreMarker ，类似于：

If you want to sub-class JacksonAnnotationIntrospector, you just need to override hasIgnoreMarker, something like:

@Override
public boolean hasIgnoreMarker(AnnotatedMember m) {
  IgnoreLevel lvl = m.findAnnotation(IgnoreLevel.class);
  // use whatever logic necessary
  if (level.value().equals("Debug")) return true;
  return super.hasIgnoreMarker();
}

但请注意，每个类只发生一次注释内省，因此无法动态更改你使用的标准。

but note that annotation introspection only occurs once per class so you can not dynamically change the criteria you use.

对于更多动态过滤，你可能想要使用JSON过滤器功能，例如参见： http://www.cowtowncoder.com/blog/archives/2011/09/entry_461.html

For more dynamic filtering you may want to rather use JSON Filter functionality, see for example: http://www.cowtowncoder.com/blog/archives/2011/09/entry_461.html

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