我有一个具有以下签名的控制器：

public HttpEntity<RepresentationModel> confirmRegistration(@Valid @RequestBody RegistrationRequest request{}

RegistrationRequest JSON如下所示

{
//other fields
"countryCode":"44",
"mobileNumber": "07545878096"
}

我正在尝试为此JSON编写自定义反序列化程序
我的mobileNumber类如下所示：

@Getter
@Setter
@EqualsAndHashCode
@ToString
@AllArgsConstructor
public class MobileNumber {
  @JsonProperty("mobilePhoneNumber")
  @JsonAlias("mobileNumber")
  String number;
  @JsonProperty(value = "countryCode", defaultValue = "44")
  String countryCode;
}

和请求对象，如下所示：

public class RegistrationRequest {
//other fields
  @JsonDeserialize(using = MobileNumberDeserializer.class)
  @MobileNumberValidator
  private final MobileNumber mobilePhoneNumber;

}

其中，MobileNumberDeserializer类似于：

public class ContactNumberDeserializer extends StdDeserializer<MobileNumber> {

  private static final long serialVersionUID = 1L;

  protected ContactNumberDeserializer() {
    super(MobileNumber.class);
  }

  @Override
  public MobileNumber deserialize(JsonParser jsonParser, DeserializationContext ctxt)
      throws IOException {

    JsonNode node = jsonParser.getCodec().readTree(jsonParser);
    String mobileNumber = "";
    if (node.has("mobilePhoneNumber")) {
      mobileNumber = node.get("mobilePhoneNumber").asText();
    } else if (node.has("phoneNumber")) {
      mobileNumber = node.get("phoneNumber").asText();
    } else if (node.has("mobileNumber")) {
      mobileNumber = node.get("mobileNumber").asText();
    }
    String countryCode = node.get("countryCode").asText();

    return new MobileNumber(mobileNumber, countryCode);

  }

当控制器jsonParser.getCodec().readTree(jsonParser);调用ContactNumberDeserializer时，它只是mobilePhoneNumber节点，无法访问countryCode。