Spring Boot无法反序列化包含OffsetDateTime的对象

Question

我试图调用一个restendpoint，它返回一个pojo对象，如下所示:

public class Process   {
  @JsonProperty("id")
  private String id = null;

  @JsonProperty("processDefinitionId")
  private String processDefinitionId = null;

  @JsonProperty("businessKey")
  private String businessKey = null;

  @JsonProperty("startedAt")
  private OffsetDateTime startedAt = null;

  @JsonProperty("endedAt")
  private OffsetDateTime endedAt = null;

  @JsonProperty("durationInMs")
  private Integer durationInMs = null;

  @JsonProperty("startActivityDefinitionId")
  private String startActivityDefinitionId = null;

  @JsonProperty("endActivityDefinitionId")
  private String endActivityDefinitionId = null;

  @JsonProperty("startUserId")
  private String startUserId = null;

  @JsonProperty("deleteReason")
  private String deleteReason = null;

  //constructors and setters+getters
}

以下是电话：

ResponseEntity<Process> responseModel = restTemplate.exchange("http://localhost:8062/processes", HttpMethod.POST, httpEntity, Process.class);

问题是我已经尝试了一些方法，例如忽略 OffsetDateTime 属性或尝试更改该日期的格式，但它会引发此错误：

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.threeten.bp.OffsetDateTime` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('2019-10-04T13:20:29.315Z')

否则它将返回空:(解决这个问题的好解决方案是什么？

Answer 1

我在使用swagger生成的bean时遇到了同样的问题。为了解决这个问题，我为日期类型创建了一些序列化器和反序列化器：org.threeten.bp.LocalDate和org.threeten.bp.offsetDateTime。它工作得很好：）。

@Bean
@Primary
public ObjectMapper serializingObjectMapper() {
    ObjectMapper objectMapper = new ObjectMapper();
    JavaTimeModule javaTimeModule = new JavaTimeModule();
    javaTimeModule.addSerializer(OffsetDateTime.class, new OffsetDateTimeSerializer());
    javaTimeModule.addDeserializer(OffsetDateTime.class, new OffsetDateTimeDeserializer());
    javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer());
    javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer());
    objectMapper.registerModule(javaTimeModule);
    return objectMapper;
}

public static class OffsetDateTimeSerializer extends JsonSerializer<OffsetDateTime> {
    @Override
    public void serialize(OffsetDateTime arg0, JsonGenerator arg1, SerializerProvider arg2) throws IOException {
        arg1.writeString(arg0.toString());
    }
}

public static class OffsetDateTimeDeserializer extends JsonDeserializer<OffsetDateTime> {
    @Override
    public OffsetDateTime deserialize(JsonParser arg0, DeserializationContext arg1) throws IOException {
        return OffsetDateTime.parse(arg0.getText());
    }
}

public static class LocalDateSerializer extends JsonSerializer<LocalDate> {
    @Override
    public void serialize(LocalDate arg0, JsonGenerator arg1, SerializerProvider arg2) throws IOException {
        arg1.writeString(arg0.toString());
    }
}

public static class LocalDateDeserializer extends JsonDeserializer<LocalDate> {
    @Override
    public LocalDate deserialize(JsonParser arg0, DeserializationContext arg1) throws IOException {
        return LocalDate.parse(arg0.getText());
    }
}

Answer 2

错误声明它无法构造org.threeten.bp.OffsetDateTime的实例。你需要使用

java.time.offsetdatetime

然后在您的模型中，您可以按照自己喜欢的任何方式对其进行格式化，例如

@JsonProperty("endedAt") //this line is not needed when it is the same as the instance variable name
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd@HH:mm:ss.SSSZ")
private OffsetDateTime endedAt;