杰克逊序列化包括子类的字段 [英] Jackson serialization includes subclass's fields

问题描述

使用Jackson序列化对象时遇到问题。文件中缺少子类中的字段。我试过Gson但也有同样的问题。谁能帮我这个？谢谢。

I had a problem when using Jackson to serialize an object. The fields in the subclass are missing in the file. I tried Gson but have the same problem as well. Can anyone help me with this? Thank you.

public class A extends ArrayList<B>{

    public String name;

    public A(){
    }
    //getter and setter
}

A a = new A();
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(file, a);

文件包含B中的所有字段，但不包含A中的字段。

file includes all the fields in B, but it does not contains fields in A.

推荐答案

通过使自定义类型为 List 子类型，Jackson使用特殊的列出生成JSON的特定序列化程序。它将简单地迭代 List 的元素并编写它们。

By making your custom type a List subtype, Jackson uses a special List specific serializer to generate the JSON. It will simply iterate the elements of the List and write those.

不使用继承，而是使用合成。

Instead of using inheritance, use composition.

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