在 Spring Data MongoDB 中为 ZonedDateTime 注册一个新的可审计日期转换器

我想要我的可审计（@CreatedDate and @LastModifiedDate) 要使用的 MongoDB 文档ZonedDateTime fields.

显然 Spring Data 不支持这种类型（看看org.springframework.data.auditing.AnnotationAuditingMetadata).

框架版本：春季启动2.0.0 and Spring数据MongoDB 2.0.0

Spring数据审计错误：

java.lang.IllegalArgumentException: Invalid date type for member <MEMBER NAME>!
Supported types are [org.joda.time.DateTime, org.joda.time.LocalDateTime, java.util.Date, java.lang.Long, long].

MongoDB配置：

@Configuration
@EnableMongoAuditing
public class MongoConfiguration {

}

可审计实体：

public abstract class BaseDocument {

    @CreatedDate
    private ZonedDateTime createdDate;

    @LastModifiedDate
    private ZonedDateTime lastModifiedDate;

}

我尝试过的事情

我还尝试创建一个自定义转换器ZonedDateTime，但 Spring Data 不考虑它。班上DateConvertingAuditableBeanWrapper has a ConversionService在构造函数方法中配置为JodaTimeConverters, Jsr310Converters and ThreeTenBackPortConverters.

自定义转换器：

@Component
public class LocalDateTimeToZonedDateTimeConverter implements Converter<LocalDateTime, ZonedDateTime> {

    @Override
    public ZonedDateTime convert(LocalDateTime source) {
        return source.atZone(ZoneId.systemDefault());
    }

}

Spring Data DateConvertingAuditableBeanWrapper：

class DefaultAuditableBeanWrapperFactory implements AuditableBeanWrapperFactory {

    abstract static class DateConvertingAuditableBeanWrapper implements AuditableBeanWrapper {

        private final ConversionService conversionService;

    }
}

是否可以审核ZonedDateTime fields?

如何注册转换器？

创建一个DateTimeProvider https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/auditing/DateTimeProvider.html提供审核时使用的当前时间：

@Component("dateTimeProvider")
public class CustomDateTimeProvider implements DateTimeProvider {
    
    @Override
    public Optional<TemporalAccessor> getNow() {
        return Optional.of(ZonedDateTime.now());
    }
}

进而：

• 参考DateTimeProvider https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/auditing/DateTimeProvider.html组件中的@EnableMongoAuditing https://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb/config/EnableMongoAuditing.html注解;
• Create Converter https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/core/convert/converter/Converter.htmls for Date https://docs.oracle.com/javase/10/docs/api/java/util/Date.html and ZonedDateTime https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html;
• Add the Converter https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/core/convert/converter/Converter.html实例到MongoCustomConversions https://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb/core/convert/MongoCustomConversions.html实例;
• 暴露MongoCustomConversions https://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb/core/convert/MongoCustomConversions.html实例作为@Bean https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/context/annotation/Bean.html.

@Configuration
@EnableMongoAuditing(dateTimeProviderRef = "dateTimeProvider")
public class MongoConfiguration {
    
    @Bean
    public MongoCustomConversions customConversions() {
        List<Converter<?, ?>> converters = new ArrayList<>();
        converters.add(new DateToZonedDateTimeConverter());
        converters.add(new ZonedDateTimeToDateConverter());
        return new MongoCustomConversions(converters);
    }

    class DateToZonedDateTimeConverter implements Converter<Date, ZonedDateTime> {

        @Override
        public ZonedDateTime convert(Date source) {
            return source == null ? null : 
                    ZonedDateTime.ofInstant(source.toInstant(), ZoneId.systemDefault());
        }
    }

    class ZonedDateTimeToDateConverter implements Converter<ZonedDateTime, Date> {

        @Override
        public Date convert(ZonedDateTime source) {
            return source == null ? null : Date.from(source.toInstant());
        }
    }
}

但是，我不会使用ZonedDateTime https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html以此目的。我会坚持OffsetDateTime https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html:

OffsetDateTime https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html, ZonedDateTime https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html and Instant https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html它们都以纳秒精度存储时间线上的瞬间。 Instant是最简单的，简单的代表瞬间。OffsetDateTime https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html添加与 UTC/格林威治的偏移量，这样就可以获取本地日期时间。ZonedDateTime https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html添加完整的时区规则。

其目的是ZonedDateTime https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html or Instant https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html用于在更简单的应用程序中对数据进行建模。当更详细地建模日期时间概念时，或者当与数据库或网络协议进行通信时，可以使用此类。