Java 我使用多通，一通，在获取数据时有无止境的循环

我在hibernate中使用manyTone和OneToMany。我想创建一个有位置的用户。 当我在postman中获取数据时，我有一个无休止的循环，因为当我获取用户时，它显示用户的位置，在位置中显示用户，等等。以下是代码：

地点类别：

 @ManyToOne(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    @JoinColumn(name=FLD_LOC, nullable=false)
    private Consumer consumers;

    public Consumption(String location, float consumpiton,Consumer consumer) {
        this.location = location;
        this.consumpiton = consumpiton;
        this.consumers=consumer;

    }

用户类别：

@OneToMany(mappedBy = Consumption.FLD_LOC,orphanRemoval = true)
private List<Consumption> locations ;


public Consumer(String clientId, String name,String location, float pwConsumption, String email, String password, String roles) {
    super(clientId, name, email, password, roles);
    this.locations=new ArrayList<>();
    this.location=location;
    this.pwcons=pwConsumption;

}

---

如何让它在JSON位置中仅显示位置或id的部分名称？

问题

当您必须使用双向关系序列化对象时，这是一个常见问题

解决方案

当面对双向关系时，向序列化程序发出停止位置的信号

第一种方法是创建自定义DTO并从rest控制器返回它们。在DTO中，您将使用

locationDto

s填充

customerDto

的

location

字段，但将

locationDto的
customer
字段设置为空

第二种方法不太可取。但是我们可以通过添加

@JsonManagedReference

和

@JsonBackReference

告诉Jackson库不要递归地序列化它

• 替换

注意：

---

在生产系统中，我们不公开域对象的所有字段，因为它可以有许多不应该对外公开的内部字段。这就是原因，第一种方法是首选的

添加

@JsonIgnore

而不是

私人列表位置

@Andronicus谢谢你的评论，我使用了下面的答案

"id": 2,
        "version": 1,
        "updated": "2020-06-28T15:41:49.082",
        "clientId": "admin",
        "name": "admin",
        "email": "admin123@gmail.com",
        "password": "$2a$10$hgcTSHjGpxEPg6WNb0U7ouHR5J5YYR5l1XVAejdK8JsG9w2Bko00a",
        "active": true,
        "roles": "ROLE_ADMIN",
        "locations": [
            {
                "locationsid": 1,
                "location": "Pecs",
                "consumpiton": 0.0,
                "consumers": {
                    "id": 2,
                    "version": 1,
                    "updated": "2020-06-28T15:41:49.082",
                    "clientId": "admin",
                    "name": "admin",
                    "email": "admin123@gmail.com",
                    "password": "$2a$10$hgcTSHjGpxEPg6WNb0U7ouHR5J5YYR5l1XVAejdK8JsG9w2Bko00a",
                    "active": true,
                    "roles": "ROLE_ADMIN",
                    "locations": [
                        {
                            "locationsid": 1,
                            "location": "Pecs",
                            "consumpiton": 0.0,
                            "consumers": {
                                "id": 2,
                                "version": 1,
                                "updated": "2020-06-28T15:41:49.082",
                                "clientId": "admin",
                                "name": "admin",
                                "email": "admin123@gmail.com",
                                "password": "$2a$10$hgcTSHjGpxEPg6WNb0U7ouHR5J5YYR5l1XVAejdK8JsG9w2Bko00a",
                                "active": true,
                                "roles": "ROLE_ADMIN",
                                "locations": [
                                    {
                                        "locationsid": 1,
                                        "location": "Pecs",

   @OneToMany(mappedBy = Consumption.FLD_LOC,orphanRemoval = true)
   private List<Consumption> locations ;

        with

    @OneToMany(mappedBy = Consumption.FLD_LOC,orphanRemoval = true)
    @JsonManagedReference
    private List<Consumption> locations ;

    @ManyToOne(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    @JoinColumn(name=FLD_LOC, nullable=false)
    private Consumer consumers;

       with

    @ManyToOne(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    @JoinColumn(name=FLD_LOC, nullable=false)
    @JsonBackReference
    private Consumer consumers;