如何在DTO模型中实现JsonNode类型字段

public class MyDto {
    private JsonNode jsonData;

    // 省略其他字段的定义和访问方法
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class MyDto {
    private JsonNode jsonData;

    // 省略其他字段的定义和访问方法

    public String toJson() throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.writeValueAsString(this);
    }

    public static MyDto fromJson(String json) throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.readValue(json, MyDto.class);
    }
}

public class Main {
    public static void main(String[] args) throws JsonProcessingException {
        MyDto dto = new MyDto();
        dto.setJsonData(JsonNodeFactory.instance.objectNode().put("key", "value"));

        String json = dto.toJson();
        System.out.println(json);

        MyDto newDto = MyDto.fromJson(json);
        System.out.println(newDto.getJsonData().get("key").asText());
    }
}