Java 用于hibernate映射的JsonIdentityInfo

我有两个实体，城市和类型，以及这两者之间的多对多关系。我需要的是：

包含类型的城市json

包含城市的json类型

我正在使用JsonIdentityInfo来阻止映射的无限递归，但我从JSON得到的东西并没有真正帮助我。 这是我目前从城市JSON得到的

0:  {
     @idType: 1
     id: 1
     name: "destination"
     cities: [2]
           - 0:  {
                  @idCity: 2
                  id: 3
                  name: "Zalau"
                  description: "City...."
                  types: [2] <---- I don't need this because I'm already in types JSON
                       - 0:  {
                              @idType: 3
                              id: 2
                              name: "other type"
                              cities: [1]
                                  - 0:  2

                          }
                        - 1:  1 <----- end of don't need
              }

            - 1:  {
                   @idCity: 4
                   id: 0
                   name: "Cluj"
                   description: "City2..."
                   types: [1] <---- don't need
                        - 0:  1

               }

}
1:  3 <----- I want to be the Type with id 3 although it was already generated from a city

城市也是如此。我需要它是双向的

这是我的实体的代码：

城市：

@Entity
@Table(name = "City")
@XmlRootElement
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@idCity")

public class City {

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "idCity")
   private int id;

   @Column(name = "name")
   private String name;

   @Column(name = "description")
   private String description;

   @ManyToMany(fetch = FetchType.EAGER)
   @JoinTable(name = "CityType", joinColumns = { @JoinColumn(name = "idCity") }, inverseJoinColumns = {
        @JoinColumn(name = "idType") })
   private Set<Type> types = new HashSet<Type>();

.... getters and setters
}

@Entity
@Table(name = "Type")
@XmlRootElement
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@idType")
public class Type {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "idType")
    private int id;

    @Column(name = "name")
    private String name;

    @ManyToMany(fetch = FetchType.EAGER, mappedBy = "types")
    private Set<City> cities = new HashSet<City>();

    .... getters and setters
}

@实体
@表（name=“City”）
@XmlRootElement
@JsonIdentityInfo（generator=ObjectiveGenerators.IntSequenceGenerator.class，属性=“@idCity”）
公营城市{
@身份证
@GeneratedValue（策略=GenerationType.AUTO）
@列（name=“idCity”）
私有int-id；
@列（name=“name”）
私有字符串名称；
@列（name=“description”）
私有字符串描述；
@ManyToMany（fetch=FetchType.EAGER）
@JoinTable（name=“CityType”，joinColumns={@JoinColumn（name=“idCity”）}，inverseJoinColumns={
@JoinColumn（name=“idType”）}）
私有集类型=新HashSet（）；
…接球手和接球手
}

类型：

@Entity
@Table(name = "City")
@XmlRootElement
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@idCity")

public class City {

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "idCity")
   private int id;

   @Column(name = "name")
   private String name;

   @Column(name = "description")
   private String description;

   @ManyToMany(fetch = FetchType.EAGER)
   @JoinTable(name = "CityType", joinColumns = { @JoinColumn(name = "idCity") }, inverseJoinColumns = {
        @JoinColumn(name = "idType") })
   private Set<Type> types = new HashSet<Type>();

.... getters and setters
}

@Entity
@Table(name = "Type")
@XmlRootElement
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@idType")
public class Type {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "idType")
    private int id;

    @Column(name = "name")
    private String name;

    @ManyToMany(fetch = FetchType.EAGER, mappedBy = "types")
    private Set<City> cities = new HashSet<City>();

    .... getters and setters
}

@实体
@表（name=“Type”）
@XmlRootElement
@JsonIdentityInfo（generator=ObjectiveGenerators.IntSequenceGenerator.class，属性=“@idType”）
公共类类型{
@身份证
@GeneratedValue（策略=GenerationType.AUTO）
@列（name=“idType”）
私有int-id；
@列（name=“name”）
私有字符串名称；
@ManyToMany（fetch=FetchType.EAGER，mappedBy=“types”）
私有集cities=新HashSet（）；
…接球手和接球手
}

更改线路

@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@idType")
to
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "id")

---

在这两个类上。

如果我这样做，唯一的区别是我有“id:3”，但没有对象的json。有没有一种方法可以解析json，即使它只引用了对象的id？我不明白你想要什么，你能详细解释一下吗。