java - @JsonTypeName 不起作用并在尝试解析子类型时返回 Missing type id

Question

我正在学习 Spring Boot，但是我停止了这个问题。我有一个带有 @JsonSubTypes 的人抽象类，一个使用 @JsonTypeName 扩展 Person 的 Client 和 Seller 类。所有请求都会返回错误:尝试解析子类型时缺少类型 id。

人员类别

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type")
@JsonSubTypes({
    @JsonSubTypes.Type(value = Client.class, name = "client"),
    @JsonSubTypes.Type(value = Seller.class, name = "seller")
//    @JsonSubTypes.Type(value = Provider.class, name = "provider"),
})
public abstract class Person implements Comparable<Person>{
    @Id
    @Field("_id")
    @JsonIgnore
    private String code;
    private String name;
    private String phone;
    private String email;
    @Field("created_at")
    private DateTime registerDate;

    public Person(String name, String phone, String email) {
        this.name = name;
        this.phone = phone;
        this.email = email;
    }

客户端类

@Document("clients")
@JsonTypeName("client")
public class Client extends Person{
    @Indexed(unique=true)
    private String cpf;
    @Field("credit_limit")
    private Double creditLimit;

    public Client(String name, String phone, String email, String cpf,
            Double creditLimit) {
        super(name, phone, email);
        this.cpf = cpf;
        this.creditLimit = creditLimit;
    }

卖家类别

@Document("sellers")
@JsonTypeName("seller")
public class Seller extends Person {
    @Indexed(unique=true)
    private String cpf;
    @Field("monthly_goal")
    private Double monthlyGoal;

    public Seller(String name, String phone, String email, String cpf,
            Double monthlyGoal) {
        super(name, phone, email);
        this.cpf = cpf;
        this.monthlyGoal = monthlyGoal;
    }

初始方法

@PostMapping("sale/store")
    @ResponseBody
    public ResponseEntity<String> store(@RequestBody Client client) {
        return ResponseEntity.ok("ok");
    }

Answer 1

您似乎缺少提交"type":"client" JSON 请求正文中的字段。 但您还需要在 Person 中提供默认构造函数。 , Client , Seller类或用 @JsonCreator 标记可用的构造函数注释:

// Client with explicit creator
    @JsonCreator
    public Client(
            @JsonProperty("name") String name, 
            @JsonProperty("phone") String phone, 
            @JsonProperty("email") String email, 
            @JsonProperty("cpf") String cpf,
            @JsonProperty("creditLimit") Double creditLimit) {
        super(name, phone, email);
        this.cpf = cpf;
        this.creditLimit = creditLimit;
    }
// ------
// seller: use default constructor (also to be added in `Person`) for Jackson
public Seller() {}

// person
public Person() {}