基于它与Jackson或Gson实现的一个接口对类进行序列化 [英] Serialize class based on one interface it implements with Jackson or Gson

问题描述

接口I1扩展Ia，Ib，Ic

接口I2 。

一个C类实现了I1，I2。
$ b C cInstance = new C（）：

  // Jackson 
 ObjectMapper mapper = new ObjectMapper（）; 
 mapper.writeValue（new File（somefile.json），cInstance）; 
 
 // Gson 
 Gson gson = new Gson（）; 
 String json = gson.toJson（cInstance）; 
  

输出将根据C的属性及其继承的内容进行cInstance序列化。
但是，我喜欢将这些属性序列化为根据I1中的setter / getters（仅在I1接口中表示的cInstance属性）。

我如何做到这一点与杰克逊知道我有太多的类具有相同的问题，我不能修改类定义或添加注释。

而同样的问题适用于反序列化（按照界面反序列化）

谢谢 解决方案

首先，即使不直接添加注释，您也可以随时添加混合注释（请参见 wiki页面）。有了这个，使用的注释将是：

$ p $ @JsonSerialize（as = MyInterface.class）


但如果您不想使用混入，您可以强制使用特定类型

  objectMapper.typedWriter（MyInterface.class）.writeValue（....）
  

I have the following:

An interface I1 extends Ia, Ib, Ic

An interface I2.

A class C implements I1, I2. And this class has its own setters and getters as well.

C cInstance = new C():

//Jackson
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(new File("somefile.json"), cInstance);

//Gson
Gson gson = new Gson();
String json = gson.toJson(cInstance);

The output will be cInstance serialized according to the properties of C and what it inherited. However, I like the properties are being serialized to be according to the setters/getters in I1 (only the cInstance properties represented in the I1 interface).

How can I do this with Jackson knowing that I have too many classes with the same problem and I can't modify the class definition or add annotations.

And the same issue applies to Deserialization (Deserializing according to an interface)

Thanks

解决方案

First of all, you can always attach "mix-in annotations" even without adding annotations directly (see wiki page). With this, annotation to use would be:

@JsonSerialize(as=MyInterface.class)

but if you do not want to use mix-ins, you can force specific type to use with

objectMapper.typedWriter(MyInterface.class).writeValue(....)

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