使用具有动态字段名称的杰克逊反序列化json [英] deserialize json using jackson with dynamic field name

问题描述

我正在尝试使用杰克逊反序列化json，问题是字段名称并不总是相同的，例如

I'm trying to deserialize json using jackson, the problem is that field names are not always the same, for instance

打个电话给我

{
  id: "blabla"
  aFieldname : { an object if type A} 
}

Another call will give me 

{
  id: "blabla"
  anotherName : { the same kind of object } 
}

我无法预测该字段的名称.甚至有可能吗?

I can't predict the name of the field. is it even possible ?

推荐答案

您可以将JSON反序列化为Map<String, Object>:

You could deserialize the JSON as a Map<String, Object>:

ObjectMapper mapper = new ObjectMapper();

TypeReference<HashMap<String, Object>> typeReference = 
    new TypeReference<HashMap<String, Object>>() {};
Map<String, Object> data = mapper.readValue(json, typeReference);

---

或者您可以使用 :

public class Data {

    private String id;
    private Map<String, Object> unknownFields = new HashMap<>();

    // Getters and setters (except for unknownFields)

    @JsonAnySetter
    public void setUnknownField(String name, Object value) {
        unknownFields.put(name, value);
    }
}

---

如果您知道该属性的可能名称，则可以使用

---

If you know the possible names of the property, you could use the @JsonAlias annotation, which was introduced in Jackson 2.9:

public class Data {

    private String id;

    @JsonAlias({ "onePossibleName", "anotherPossibleName" })
    private Foo something;

    // Getters and setters
}

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