實體/文檔類中的@DateTimeFormat批注

Question

我需要在實體類中將字符串從mongo映射到LocalDateTime。 mongo中的日期存儲為字符串，而不是ISODate。 例如。 2015-02-05 10:10:10

我嘗試使用@DateTimeFormat（pattern =“ yyyy-MM-dd HH：mm：ss”），但似乎未觸發。

@Document
@Data
@NoArgsConstructor
public class XYZ {

    @Field(name = "datetime")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime datetime;

}

目前，XYZrepository.findAll（）引發異常

org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.time.LocalDateTime] for value '2015-02-05 10:10:10'; nested exception is java.time.format.DateTimeParseException: Text '2015-02-05 10:10:10' could not be parsed at index 10
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:47) ~[spring-core-5.2.0.M3.jar:5.2.0.M3]
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:191) ~[spring-core-5.2.0.M3.jar:5.2.0.M3]
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174) ~[spring-core-5.2.0.M3.jar:5.2.0.M3]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1513) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1417) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:392) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.populateProperties(MappingMongoConverter.java:309) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:289) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:259) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:208) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:204) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:91) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at org.springframework.data.mongodb.core.ReactiveMongoTemplate$ReadDocumentCallback.doWith(ReactiveMongoTemplate.java:3061) ~[spring-data-mongodb-2.2.0.RC1.jar:2.2.0.RC1]
    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:100) ~[reactor-core-3.3.0.M2.jar:3.3.0.M2]

Answer 1

我認為您應該實現一個轉換器。

例：

@WritingConverter
public class LocalDateTimeToStringConverter implements Converter<LocalDateTime, String> {

    @Override
    public String convert(LocalDateTime localDateTime) {
        return localDateTime.toString();
    }
}

@ReadingConverter
public class StringToLocalDateTimeConverter implements Converter<String, LocalDateTime> {
    @Override
    public LocalDateTime convert(String s) {
        return LocalDateTime.parse(s);
    }
}

@Configuration
public class MongoConfig {

    @Bean
    public MongoCustomConversions customConversions() {
        List<Converter<?, ?>> converterList = new ArrayList<>();
        converterList.add(new LocalDateTimeToStringConverter());
        converterList.add(new StringToLocalDateTimeConverter());
        return new MongoCustomConversions(converterList);
    }
}

它將String轉換為LocalDateTime並從MongoDB返回。