Jackson反序列化字符串为泛型类

实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class PageQueryParam {
    private T query;
    private Integer pageNum = 1;
    private Integer pageSize = GlobalConstant.Common.PAGE_SIZE;
}

待转换的JSON字符串

{
    "query": {
        "username": "zhangsan",
        "password": "1234"
    },
    "pageNum": 1,
    "pageSize": 4
}

转换测试代码

public static void main(String[] args) throws JsonProcessingException {
    String json = "{\"query\":{\"username\":\"zhangsan\",\"password\":\"1234\"},\"pageNum\":1,\"pageSize\":4}";

    ObjectMapper objectMapper = new ObjectMapper();
    PageQueryParam pageQueryParam = objectMapper.readValue(json, new TypeReference() {
    });

    User user = pageQueryParam.getQuery();
    System.out.println(user);
    Integer pageNum = pageQueryParam.getPageNum();
    System.out.println(pageNum);
    Integer pageSize = pageQueryParam.getPageSize();
    System.out.println(pageSize);
}

结果