Jackson YAML序列化：禁用原生类型标签以实现一致的多态输出

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.dataformat.yaml.YAMLGenerator;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
import lombok.Value;
import com.google.common.collect.ImmutableList;

import java.util.List;
import static java.util.Objects.requireNonNull;

// Vehicle 接口及其多态配置
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME,
    include = JsonTypeInfo.As.EXISTING_PROPERTY,
    property = "type")
@JsonSubTypes({
    @JsonSubTypes.Type(value = Car.class, name = "car"),
    @JsonSubTypes.Type(value = Truck.class, name = "truck") })
public interface Vehicle {
    String getName();
}

// Car 实现类
@Value
public static class Car implements Vehicle {
    String name;
    String type = "car"; // 明确指定类型属性

    @JsonCreator
    public Car(@JsonProperty("name") final String name) {
        this.name = requireNonNull(name);
    }
}

// Truck 实现类
@Value
public static class Truck implements Vehicle {
    String name;
    String type = "truck"; // 明确指定类型属性

    @JsonCreator
    public Truck(@JsonProperty("name") final String name) {
        this.name = requireNonNull(name);
    }
}

// 包含 Vehicle 列表的容器类
@Value
public static class Vehicles {
    List<Vehicle> vehicles;

    @JsonCreator
    public Vehicles(@JsonProperty("vehicles") final List<Vehicle> vehicles) {
        super();
        this.vehicles = requireNonNull(vehicles);
    }
}

public class SerializationDemo {
    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper JSON_MAPPER = new ObjectMapper();
        ObjectMapper YAML_MAPPER = YAMLMapper.builder()
            .disable(YAMLGenerator.Feature.WRITE_DOC_START_MARKER) // 禁用YAML文档开始标记
            .build();

        final Vehicles vehicles = new Vehicles(ImmutableList.of(new Car("Dodge"), new Truck("Scania")));

        // 序列化为JSON
        final String json = JSON_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(vehicles);
        System.out.println("--- JSON Output ---");
        System.out.println(json);

        // 序列化为YAML
        final String yaml = YAML_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(vehicles);
        System.out.println("\n--- YAML Output ---");
        System.out.println(yaml);
    }
}

--- JSON Output ---
{
  "vehicles" : [ {
    "name" : "Dodge",
    "type" : "car"
  }, {
    "name" : "Scania",
    "type" : "truck"
  } ]
}

--- YAML Output ---
vehicles:
- !<car>
  name: "Dodge"
  type: "car"
- !<truck>
  name: "Scania"
  type: "truck"

import com.fasterxml.jackson.dataformat.yaml.YAMLGenerator;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;

// ... 其他导入和类定义 ...

public class SerializationDemo {
    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper JSON_MAPPER = new ObjectMapper();

        // 修改后的 YAML_MAPPER 配置
        ObjectMapper YAML_MAPPER = YAMLMapper.builder()
            .disable(YAMLGenerator.Feature.WRITE_DOC_START_MARKER)
            .disable(YAMLGenerator.Feature.USE_NATIVE_TYPE_ID) // 禁用原生类型标签
            .build();

        final Vehicles vehicles = new Vehicles(ImmutableList.of(new Car("Dodge"), new Truck("Scania")));

        final String json = JSON_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(vehicles);
        System.out.println("--- JSON Output ---");
        System.out.println(json);

        final String yaml = YAML_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(vehicles);
        System.out.println("\n--- YAML Output (Fixed) ---");
        System.out.println(yaml);
    }
}

--- YAML Output (Fixed) ---
vehicles:
- name: "Dodge"
  type: "car"
- name: "Scania"
  type: "truck"