如何告诉jackson忽略我无法控制源代码的属性？ [英] How can I tell jackson to ignore a property for which I don't have control over the source code?

问题描述

长话短说，我的一个实体有一个当你调用getBoundary时抛出异常的GeometryCollection （为什么这是另一本书，现在让我们说这是它的工作方式）。

Long story short, one of my entities has a GeometryCollection that throws an exception when you call "getBoundary" (the why of this is another book, for now let's say this is the way it works).

我有没有办法告诉杰克逊不要包括那个特定的吸气剂？我知道当我拥有/控制代码时我可以使用@JacksonIgnore。但事实并非如此，杰克逊通过连续序列化父对象来达到这一点。我在jackson文档中看到了一个过滤选项。这是一个看似合理的解决方案吗？

Is there a way I can tell Jackson not to include that specific getter? I know I can use @JacksonIgnore when I do own/control the code. But this is not case, jackson ends reaching this point through continuous serialization of the parent objects. I saw a filtering option in jackson documentation. Is that a plausible solution?

谢谢！

推荐答案

你可以使用 Jackson Mixins 。例如：

class YourClass {
  public int ignoreThis() { return 0; }    
}

使用此Mixin

abstract class MixIn {
  @JsonIgnore abstract int ignoreThis(); // we don't need it!  
}

这个：

objectMapper.getSerializationConfig().addMixInAnnotations(YourClass.class, MixIn.class);

编辑：

感谢评论使用Jackson 2.5+时，API已更改，应使用 objectMapper.addMixIn（Class<？> target，Class<？> mixinSource）调用

Thanks to the comments, with Jackson 2.5+, the API has changed and should be called with objectMapper.addMixIn(Class<?> target, Class<?> mixinSource)

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