Jackson 将 ISO8601 格式的日期时间反序列化为 Java8 Instant
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Hymanson deserialize ISO8601 formatted date-time into Java8 Instant
提问by Kre?imir Nesek
I'm trying to deserialize an ISO8601 formatted date into Java8 Instant using Hymanson. I registered JavaTimeModule with the ObjectMapper, turned off WRITE_DATES_AS_TIMESTAMPS.
我正在尝试使用 Hymanson 将 ISO8601 格式的日期反序列化为 Java8 Instant。我用 ObjectMapper 注册了 JavaTimeModule，关闭了 WRITE_DATES_AS_TIMESTAMPS。
However, if one tries to deserialize 2016-03-28T19:00:00.000+01:00 it will not work, because it seems that JavaTimeModule will only deserialize date-times formatted with UTC timezone offset (e.g. 2016-03-28T18:00:00.000Z). I then tried using @JsonFormat annotation like this:
但是，如果尝试反序列化 2016-03-28T19:00:00.000+01:00 它将不起作用，因为 JavaTimeModule 似乎只会反序列化使用 UTC 时区偏移量格式的日期时间（例如 2016-03-28T18:00 :00.000Z)。然后我尝试使用这样的 @JsonFormat 注释：
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd'T'HH:mm:ss.SSSZ", timezone = "UTC")
And like this:
像这样：
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd'T'HH:mm:ss.SSSZ", timezone = JsonFormat.DEFAULT_TIMEZONE)
However, neither of these work and I get an exception:
但是，这些都不起作用，我得到了一个例外：
com.fasterxml.Hymanson.databind.JsonMappingException: Unsupported field: YearOfEra (through reference chain: org.example.Article["date"])
Which implies that timezone parameter is ignored and date time formatter doesn't know how to format an Instant without a timezone.
这意味着时区参数被忽略，日期时间格式化程序不知道如何在没有时区的情况下格式化 Instant。
Is there a way to deserialize a ISO8601 string that's not in UTC time zone offset to Java 8 Instant using Hymanson and JavaTimeModule without writing custom deserializer?
有没有办法使用 Hymanson 和 JavaTimeModule 将不在 UTC 时区偏移量中的 ISO8601 字符串反序列化到 Java 8 Instant 而无需编写自定义反序列化器？
采纳答案by Meiko Rachimow
You need to set the explicit time zone via XXXin your modell class:
您需要通过XXX在您的模型类中设置显式时区：
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX")
(see: https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html)
（参见：https: //docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html）
回答by Mick Belker - Pseudonym
The format "Z" does not work with "+01:00" as this is a different pattern. JsonFormat is using SimpleDateFormat patterns. "Z" in upper caseonly represents strict RFC 822. You have to use syntax like: "+0100", without colon.
格式“Z”不适用于“+01:00”，因为这是一种不同的模式。JsonFormat 使用 SimpleDateFormat 模式。大写的“Z”仅代表严格的 RFC 822。您必须使用类似以下的语法：“+0100”，不带冒号。
回答by Guss
If you want to serialize Dateobjects into ISO-8601, you don't need to specify a pattern at all - ISO-8601 is the default pattern. It is kind of mentioned in the JsonFormatJava doc:
如果要将Date对象序列化为 ISO-8601，则根本不需要指定模式 - ISO-8601 是默认模式。它在JsonFormatJava 文档中有所提及：
Common uses include choosing between alternate representations -- for example, whether Date is to be serialized as number (Java timestamp) or String (such as ISO-8601 compatible time value)-- as well as configuring exact details with pattern() property.
常见用途包括在替代表示之间进行选择——例如，将日期序列化为数字（Java 时间戳）还是字符串（例如 ISO-8601 兼容的时间值）——以及使用 pattern() 属性配置确切的细节。
[emphasasis mine] you should understand from the above text that specifying shape = STRINGwould mean an ISO-8601 format but you can choose something else using the patternproperty.
[强调我的] 你应该从上面的文本中了解到指定shape = STRING意味着 ISO-8601 格式，但你可以使用该pattern属性选择其他内容。
In my experience, this always turns out a UTC date format (with the time zone rendered as +0000), which could be the default time zone in my VM (even though my operating system clock is not set to UTC).
根据我的经验，这总是会产生 UTC 日期格式（时区呈现为+0000），这可能是我的 VM 中的默认时区（即使我的操作系统时钟未设置为 UTC）。
回答by zoomout
In Hymanson 2.9.8 (current one as I'm writing this) it's better to use Instant instead of Date.
在 Hymanson 2.9.8（我写这篇文章时的当前版本）中，最好使用 Instant 而不是 Date。
You have to add a dependency:
您必须添加一个依赖项：
<dependency>
<groupId>com.fasterxml.Hymanson.datatype</groupId>
<artifactId>Hymanson-datatype-jsr310</artifactId>
<version>2.9.8</version>
</dependency>
Also, register the module and configure SerializationFeature.WRITE_DATES_AS_TIMESTAMPS to false.
此外，注册模块并将 SerializationFeature.WRITE_DATES_AS_TIMESTAMPS 配置为 false。
new ObjectMapper()
.findAndRegisterModules()
.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
More information about Hymanson for Java8 here: https://github.com/FasterXML/Hymanson-modules-java8
更多关于 Hymanson for Java8 的信息：https: //github.com/FasterXML/Hymanson-modules-java8
