Spring Boot 无法反序列化包含 OffsetDateTime 的对象

Question

我正在尝试调用一个休息端点，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}这是调用：ResponseEntity<Process> responseModel = restTemplate.exchange("http://localhost:8062/processes", HttpMethod.POST, httpEntity, Process.class);问题是我尝试了一些方法，例如忽略 OffsetDateTime 属性或尝试更改该日期的格式，但它会抛出此错误：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')或者它将返回 null :( 解决这个问题的好解决方案是什么？

Answer 1

该错误表明它无法构造 org. Threeten.bp.OffsetDateTime 的实例。你需要使用

java.time.offsetdatetime

然后在你的模型中你可以按照你喜欢的方式格式化它，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;

Answer 2

我对 swagger 生成的 bean 也有同样的问题。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。而且效果很好:)。

@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());

    }

}