在JPA/Jackson中使用自定义子对象序列化@ManyToOne对象

@Entity
public class Parent {
    @Id
    private Long id;

    // Other fields and annotations

    @OneToMany(mappedBy = "parent")
    private List<Child> children;

    // Getters and setters
}

@Entity
public class Child {
    @Id
    private Long id;

    // Other fields and annotations

    @ManyToOne
    @JoinColumn(name = "parent_id")
    private Parent parent;

    // Getters and setters
}

public class ParentSerializer extends JsonSerializer<Parent> {
    @Override
    public void serialize(Parent parent, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeStartObject();
        jsonGenerator.writeNumberField("id", parent.getId());
        // Serialize other fields of Parent if needed
        jsonGenerator.writeEndObject();
    }
}

@Entity
public class Child {
    @Id
    private Long id;

    // Other fields and annotations

    @ManyToOne
    @JoinColumn(name = "parent_id")
    @JsonSerialize(using = ParentSerializer.class)
    private Parent parent;

    // Getters and setters
}

ObjectMapper objectMapper = new ObjectMapper();
String json = objectMapper.writeValueAsString(child);