Jackson排除序列化过程中容器(列表，地图，集合)的类型信息 [英] Jackson excluding type information for containeirs (List, Map, Collection) during serialization

问题描述

在 Jackson 中，我想为每个自定义对象添加类型信息.为了做到这一点而没有注释，我正在使用

In Jackson I want to include type-information for every custom objects. To accomplish this without annotation, I am using

OBJECT_MAPPER.enableDefaultTypingAsProperty(DefaultTyping.NON_FINAL, "@Ketan");

它正在工作，但是它还包括List，Map，Collection的类型信息，就像容器本身一样.

It is working but it is also including type-information for List, Map, Collection like container itself.

让我给您一个Animal，Dog，Cat和Zoo层次结构的标准示例.

Let me give you a standard example of Animal, Dog, Cat and Zoo hierarchy.

class Zoo {

    List<Cat> cats;
    Dog dog;

    public Dog getDog() {
       return dog;
    }

    public void setDog(Dog dog) {
       this.dog = dog;
    }

    public List<Cat> getCats() {
       return cats;
    }

    public void setCats(List<Cat> cats) {
       this.cats = cats;
    }

}

在这里，我有两个自定义对象，Cat和Dog.我只想只包含那些类型信息，但是它也包含了容器信息–在我的情况下也是List.

Here, I have two custom objects, Cat and Dog. I just want to include type information for only those, but it is including for container – List in my case – as well.

请在下面查看我通过序列化获得的JSON字符串.

Please see below the JSON string I got by serialization.

{
    "@Ketan": "com.csam.wsc.enabling.core.codec.json.test.Zoo1",
    "cats": [
        // This line contains the issue //
        "java.util.ArrayList",
        [
            {
                "@Ketan": "com.csam.wsc.enabling.core.codec.json.test.Cat",
                "name": "animalName",
                "likesCream": true,
                "lives": 10
            },
            {
                "@Ketan": "com.csam.wsc.enabling.core.codec.json.test.Cat",
                "name": "animalName",
                "likesCream": true,
                "lives": 10
            }
        ]
    ],
    "dog": {
        "@Ketan": "com.csam.wsc.enabling.core.codec.json.test.Dog",
        "name": "animalName",
        "barkVolume": 0.0
    }
}

对我来说，一切都很好，但突出显示的内容– JSON字符串中的java.util.ArrayList.我不想要这样的容器类型信息.

Everything is fine to me except what I have highlighted – java.util.ArrayList in the JSON string. I do not want such a container type information.

是否在API级别以上本身提供了简单的支持来实现此目标，而又不重写TypeResolverBuilder或进行任何自定义?

Is there any easy support at above API level itself to achieve this without overriding TypeResolverBuilder or any customization?

推荐答案

否，除非您声明Collections为最终类型.

No, unless you declare your Collections to be final types.

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