java - Json 和 Array 序列化 - Java Spring Boot

Question

我正在尝试插入手机列表，但没有成功。

我的域客户端类

@Entity   
public class Client {

@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private Integir id;
private String name;
@JsonManagedReference
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(****)
private List<Phone> phones = new ArrayList<>();
**gets and sets**

   public Client (String name){
   this.name = name;
   }
}

我的域电话类

@Entity
public class Phone {

@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private Integir id;
private String number;
@JsonBackReference
@ManyToMany(mappedBy = "phones")
private List<Client> clients = ArrayList<>();
**gets and sets**
    public Phone(String number) {
    this.number = number;
    }  
}

我有一个 DTO 客户端DTO

public class ClientDTO {

private String name;
private String number;
private List<Phone> numbers = ArryList<>();
**gets and sets** 
}

我的服务ClientService有这个方法:

public Client fromDTO (ClientDTO clientDTO) {

  Client c = new Client(clientDTO.getName());
  for(Phone p: clientDTO.getNumbers()) {
  p.setNumber(x.getNumber);
  p.getClients().addALL(Arrys.asList(c));
  c.getPhones().addAll(Arrys.asList(p));
  }
}

如果我在 postman 中尝试这样做:

{
 "name" : "Teste",
 "numbers": 
  [
   { "number" : "xxxxxx"},
   { "number" : "yyyyyyy"}  
  ]
}

显示错误 415:不支持的媒体类型

如果我将 ClientDTO 更改为:

public class ClientDTO {

private String name;
private String number;
**gets and sets** 
}

我在 ClientService 中的方法是:

public Client fromDTO (ClientDTO clientDTO) {

Client c = new Client(clientDTO.getName());
Phone p = new Phone(clientDTO.getPhone());

p.getClients().addAll(Arrys.asList(c));
c.getPhones().addAll(Arrays.asList(p));
}

在我的 postman 中我发送了这个:

{
  "name" : "Teste",
  "number": "xxxxx" 
}

工作正常。

我做错了什么？

Answer 1

向客户端和电话实体类添加一个空(无参数)构造函数

客户端实体类

@Entity   
public class Client {

@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private Integir id;
private String name;
@JsonManagedReference
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(****)
private List<Phone> phones = new ArrayList<>();
**gets and sets**

   public Client (){}
   public Client (String name){
    this.name = name;
   }
}

电话实体类

@Entity
public class Phone {

@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
private Integir id;
private String number;
@JsonBackReference
@ManyToMany(mappedBy = "phones")
private List<Client> clients = ArrayList<>();
**gets and sets**

    public Phone() {}
    public Phone(String number) {
      this.number = number;
    }  
}

如果对象没有可序列化的父类(super class)并且没有无参数构造函数，则无法序列化该对象。由于您在 ClientDTO 中使用了 Phone 实体类，并且它没有无参数构造函数，因此序列化过程失败