根据另一个字段值序列化和反序列化字段

如何根据同一类中的另一个字段值序列化或反序列化字段?

Packet type payload 字段将被序列化和反序列化。

public enum PayloadType {
    HTTP,
    HTTPS,
    FTP
}

数据包类

public class Packet {
    private final String payload;
    // This field should determine how "payload" field is serialized.
    private final PayloadType type;     
    private final Date creationTime;

@JsonCreator
public Packet(String payload, PayloadType type) {
    this.payload = payload;
    this.type = type;
    this.creationTime = new Date();
}

public String getPayload() {
    return this.payload;
}

public PayloadType getType() {
    return this.type;
}

public Date getCreationTime() {
    return this.creationTime;
}

public class PacketTests {
@Test
public void packetSerialization_fromHttpType() throws JsonProcessingException {
    // Given
    ObjectMapper jackson = new ObjectMapper();
    String payload = "hello world";
    PayloadType type = PayloadType.HTTP;
    Packet packet = new Packet(payload, type);
    String json;

    // When
    json = jackson.writeValueAsString(packet);

    // Then
    System.out.println(json);
}

电流输出

{"payload":"hello world","type":"HTTP","creationTime":1542538836041}

预期产出

{"payload":"(http) hello world","type":"HTTP","creationTime":1542538836041}
{"payload":"(https) hello world","type":"HTTPS","creationTime":1542538836041}
{"payload":"X9hnahj83","type":"FTP","creationTime":1542538836041}

有效载荷 属于 FTP 是base64字符串。