【发布时间】：2021-01-24 00:30:11
【问题描述】：
我正在尝试使用 java.time 包制作 Java POJO，它绑定了“美联储经济数据 (FRED)”API 的列。其中一些列包括如下时间问题，
columns name example
---------------------------------------------
observation_end 2024-10-01 00:00:00
observation_start 2017-10-01 00:00:00
last_updated 2014-02-04 10:06:03-06:00
所以我做了以下Java POJO：
@Data
public class FredColumnPojo {
@JsonProperty("realtime_start")
@JsonFormat(pattern="yyyy-MM-dd")
@JsonDeserialize(using = LocalDateDeserializer.class)
private LocalDate realtime_start;
@JsonProperty("realtime_end")
@JsonFormat(pattern="yyyy-MM-dd")
@JsonDeserialize(using = LocalDateDeserializer.class)
private LocalDate realtime_end;
@JsonProperty("last_updated")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss Z")
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
private LocalDateTime last_updated;
realtime_start 和 realtime_end 列已成功与 FRED api 绑定。但是last_updated 行会引发异常。
Exception in thread "main" com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.time.LocalDateTime` from String "2020-12-18 16:04:07-06": Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text '2020-12-18 16:04:07-06' could not be parsed at index 19
at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: java.util.ArrayList[0]->com.aaa.etl.pojo.FredColumnPojo["last_updated"])
at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:67)
at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:1676)
at com.fasterxml.jackson.databind.DeserializationContext.handleWeirdStringValue(DeserializationContext.java:932)
at com.fasterxml.jackson.datatype.jsr310.deser.JSR310DeserializerBase._handleDateTimeException(JSR310DeserializerBase.java:176)
Caused by: java.time.format.DateTimeParseException: Text '2020-12-18 16:04:07-06' could not be parsed at index 19
at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2046)
at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
我认为realtime_start和realtime_end的json格式模式与FRED api实际值的时间格式（yyyy-MM-dd）是正确的。但是last_updated 列会引发异常，因为模式 yyyy-MM-dd HH:mm:sss Z 与 FRED api 中的字符串值不正确(Text '2020-12-18 16:04:07-06' ）。我已经在 json 格式模式中插入了各种值 'Z'、'ZZ'、'x'。但我所有的努力都失败了。
更新
我用下面的代码部分解决了我的问题。
String input = "2014-02-04 10:06:03-06:00".replace(" ", "T");
DateTimeFormatter date = DateTimeFormatter.ISO_DATE_TIME;
LocalDateTime ldt = LocalDateTime.parse(input, date);
System.out.println(idt);
我的目标是在 last_updated 列的 JsonFormat 中制作包含 DateTimeFormatter.ISO_DATE_TIME 的 pojo 类。但我不知道如何使用 DateTimeFormatter.ISO_DATE_TIME 实现 pojo 类。
@JsonProperty("last_updated")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss Z") <-- How to set the pattern to DateTimeFormatter.ISO_DATE_TIME
private LocalDateTime last_updated;
再次更新
所以我制作了如下的 JsonDeserialize 类：
public class DefaultLocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException, JsonProcessingException {
// TODO Auto-generated method stub
String input = p.getText().replace(" ", "T");
DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
LocalDateTime localDateTime = LocalDateTime.parse(input, formatter);
return localDateTime;
}
}
并且我更改了 POJO 类的 JsonDeserialize 类：
@JsonProperty("last_updated")
@JsonDeserialize(using = DefaultLocalDateTimeDeserializer.class)
private LocalDateTime last_updated;
但代码仍然抛出异常
Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Text '2020-12-18T16:04:07-06' could not be parsed, unparsed text found at index 19 (through reference chain: java.util.ArrayList[0]->com.aaa.etl.pojo.FredColumnPojo["last_updated"])
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:394)
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:353)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1714)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:290)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:286)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:245)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27)
at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:4173)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2492)
at com.aaa.etl.processor.Fred2Hdfs.getEtlListData(Fred2Hdfs.java:146)
at com.aaa.etl.processor.EtlFileUploader.main(EtlFileUploader.java:39)
Caused by: java.time.format.DateTimeParseException: Text '2020-12-18T16:04:07-06' could not be parsed, unparsed text found at index 19
at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2049)
at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
at java.base/java.time.LocalDateTime.parse(LocalDateTime.java:492)
at com.aaa.etl.pojo.DefaultLocalDateTimeDeserializer.deserialize(DefaultLocalDateTimeDeserializer.java:20)
at com.aaa.etl.pojo.DefaultLocalDateTimeDeserializer.deserialize(DefaultLocalDateTimeDeserializer.java:1)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:129)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:288)
... 8 more
【问题讨论】：
-
您是否尝试过 Timestamp 而不是 LocalDateTime？
-
@AlejandroDeulofeu
java.sql.Timestamp类现在是遗留的，不应该因为设计缺陷而被使用。随着 JSR 310 的采用，旧的日期时间类已过时。带有时间和与 UTC 的偏移量的日期（例如2014-02-04 10:06:03-06:00）的适当类是OffsetDateTime。 -
请检查我再次更新的部分并通知我您的智能回复。