如何将json对象反序列化为展平格式直接字段?

时间:2020-08-12 09:47:07

标签: java json spring-boot jackson

我具有以下结构:

public class User {
    private Account account;
    //constuctors, getters and setters
}

public class Account {
    private String id;
    private String description;
    //constructor, getters and setters
}

执行请求时,我需要创建以下JSON结构:

{
    "account": 
    { 
        "id": "1",
        "description": "Some description"
    }
}

但是我想简短地指定此信息,并通过以下方式忽略(左为“ null”)“描述”字段:

{
     "account": "1" // I want to set directly the id field in the account object.
}

我该怎么办?我尝试使用@JsonCreator批注和@JsonUnwrapped,但没有结果。

2 个答案:

答案 0 :(得分:4)

您可以使用自定义解串器

public class AccountFromIdDeserializer extends StdDeserializer<Account> {
  public AccountFromIdDeserializer() { this(null);}
  protected AccountFromIdDeserializer(Class<Account> type) { super(type);}

  @Override
  public Account deserialize(JsonParser parser, DeserializationContext context)
  throws IOException, JsonProcessingException {
    Account account = new Account();
    account.setId(parser.getValueAsString());
    return account;
  }
}

然后使用accountUser的{​​{1}}节点上使用

@JsonDeserialize

答案 1 :(得分:2)

最后,我使用了 @JsonCreator 批注并创建了两个构造函数:

@JsonCreator
public Account(@JsonProperty("id") String id, @JsonProperty("description") String description) {
    this.id = id;
    this.description = description;
}

@JsonCreator
public Account(String id) {
     this.id = id;
}