java - 如何配置 jackson objectmapper 以正确反序列化为 pojo？

Question

我在理解反序列化时应该如何配置 objectMapper 和 pojo 时遇到一些问题。我的 Json 是由另一个应用程序创建的同时支持 xml 和 json。它返回一个包含 myobject 的列表，但 Json 包含类型，如下所示:

[
    {
        "myobject": {
            "somethingcool": "amazing",
            "contactPersonsForMyObject": [
                "test.test@gmail.com",
                "test@test.se"
            ],
            "myObjectId": "c85e48730501bfae41e67714c6131b7d"
        }
    },
    {
        "myobject": {
            "somethingcool": "cool",
            "contactPersonsForMyObject": [
                "test.test2@gmail.com",
                "test@test2.se"
            ],
            "myObjectId": "c85e48730501bfae41e67714cqwerty"
        }
    }
]

我的类(class):

public class MyObject {

    private String myObjectId;
    private String somethingcool;
    private List<String> contactPersonsForMyObject;

    public String getMyObjectId() {
        return myObjectId;
    }

    public void setMyObjectId(String myObjectId) {
        this.myObjectId = myObjectId;
    }

    public String getSomethingcool() {
        return somethingcool;
    }

    public void setSomethingcool(String somethingcool) {
        this.somethingcool = somethingcool;
    }

    public List<String> getContactPersonsForMyObject() {
        return contactPersonsForMyObject;
    }

    public void setContactPersonsForMyObject(List<String> contactPersonsForMyObject) {
        this.contactPersonsForMyObject = contactPersonsForMyObject;
    }
}

但是在做的时候:

List<MyObject> myObjects = mapper.convertValue(rootNode, new TypeReference<List<MyObject>>() {});

我收到一个异常说明:

java.lang.IllegalArgumentException: Unrecognized field "myobject" (Class com.domain.MyObject), not marked as ignorable
 at [Source: N/A; line: -1, column: -1] (through reference chain: com.domain.MyObject["myobject"])

这就像映射器不理解额外的“层”。序列化以获得此结构时，可以像这样配置映射器:mapper.configure(SerializationConfig.Feature.WRAP_ROOT_VALUE, true);

那么应该有什么办法可以反过来？

谢谢!

Answer 1

你需要给它具体的类而不是接口(interface)。所以

List<Map<String, MyObject>> myObjects = mapper.readValue(json, new TypeReference<ArrayList<HashMap<String, MyObject>>>() {
        });