对象列表的Java lombok通用字段[重复]

Question

我有来自api的json响应，结构如下：

{
    "countPerPage": 20,
    "totalCount": 401,
    "currentPage": 1,
    "totalPage": 21,
    "data": [
        {
            "id": 1,
            "catId": 12,
            "dogId": 12,
            "creationDate": "2022-01-03 12:29:38",
            "comment": "Some comment"
        },
        {
            "id": 2,
            "catId": 13,
            "dogId": 16,
            "creationDate": "2022-01-08 11:14:25",
            "comment": "Some comment"
        },
        ...
    ]
}

像这样

{
    "countPerPage": 20,
    "totalCount": 226,
    "currentPage": 3,
    "totalPage": 12,
    "data": [
        {
            "id": 1,
            "parentId": 12,
            "firstName": "John",
            "lastName": "Doe",
            "creationDate": "2022-01-03 12:29:38",
            "age": 25
        },
        {
            "id": 1,
            "parentId": 12,
            "firstName": "Michael",
            "lastName": "Finder",
            "creationDate": "2022-01-08 11:14:25",
            "age": 24
        },
        ...
    ]
}

和其他具有相同结构的产品。

如果我为这样的人创建响应java类

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class PersonResponse{
    @JsonProperty("id")
    private int id;

    @JsonProperty("parentId")
    private int parentId;

    @JsonProperty("firstName")
    private String firstName;

    @JsonProperty("lastName")
    private String lastName;

    @JsonProperty("creationDate")
    private String creationDate;

    @JsonProperty("age")
    private int age;
}

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class PersonWithCount {
    @JsonProperty("countPerPage")
    private int countPerPage;

    @JsonProperty("totalCount")
    private int totalCount;

    @JsonProperty("currentPage")
    private int currentPage;

    @JsonProperty("totalPage")
    private int totalPage;

    @JsonProperty("data")
    private List<PersonResponse> data;
}

对于这样的动物

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class AnimalResponse{
    @JsonProperty("id")
    private int id;

    @JsonProperty("catId")
    private int catId;

    @JsonProperty("dogId")
    private int dogId;

    @JsonProperty("creationDate")
    private String creationDate;

    @JsonProperty("comment")
    private String comment;
}

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class AnimalWithCount {
    @JsonProperty("countPerPage")
    private int countPerPage;

    @JsonProperty("totalCount")
    private int totalCount;

    @JsonProperty("currentPage")
    private int currentPage;

   @JsonProperty("totalPage")
    private int totalPage;

    @JsonProperty("data")
    private List<AnimalResponse> data;
}

所有作品都很好。但是我如何使用像泛型这样的通用的东西，因为不要复制和粘贴每个具有相同数据的时间类，其中只更改了最后一个字段？

我期待这样的事情，但它并没有工作

@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class DataWithCount<T> {
    @JsonProperty("countPerPage")
    private int countPerPage;

    @JsonProperty("totalCount")
    private int totalCount;

    @JsonProperty("currentPage")
    private int currentPage;

    @JsonProperty("totalPage")
    private int totalPage;

    @JsonProperty("data")
    private List<T> data;
}

填充变量：

personListWithCount = ObjectMapperCreator.objectMapperCreator().readValue(personResponse.getBody().asPrettyString(), PersonListWithCount.class);

也许我做错了什么？

Answer 1

帮助回答其他问题（杰克逊 - 使用泛型类反序列化）：

mapper.readValue(jsonString, new TypeReference<DataWithCount<AnimalResponse>>() {});

第二种方式也有效

JavaType type = mapper.getTypeFactory().constructParametricType(DataWithCount.class, AnimalResponse.class);
DataWithCount<AnimalResponse> data = mapper.readValue(json, type);

谢谢@Nick