问题描述
限时送ChatGPT账号..似乎没有内置的 java.time 解析器可以处理任何有效的 W3C ISO 8601 日期/时间字符串.
There doesn't seem to be a built-in java.time parser that can handle any valid W3C ISO 8601 date/time string.
它应该返回一个 ZonedDateTime,其中缺失的字段按照 W3C 规范中的规定设置为 0.
It should return a ZonedDateTime, with missing fields set to 0 as specified in the W3C spec.
这似乎是一个很常见的用例,我很惊讶它不是标准库的一部分,而且我想它在库外已经多次解决了.有人有解决方案吗?
This seems to be such a common use case, im surprised its not part of the standard library, and i imagine its been solved multiple times outside the library. Anyone have solutions?
推荐答案
DateTimeFormatterBuilder#parseDefaulting
链接中的示例 W3C ISO 8601 是 OffsetDateTime
而不是 ZonedDateTime
.ZonedDateTime
需要时区 ID,例如欧洲/伦敦
.此外,JDBC 4.2 支持 OffsetDateTime
,而不是 ZonedDateTime
.
DateTimeFormatterBuilder#parseDefaulting
The examples in your link, W3C ISO 8601 are OffsetDateTime
and not ZonedDateTime
. A ZonedDateTime
require a timezone ID e.g. Europe/London
. Also, JDBC 4.2 supports OffsetDateTime
, not ZonedDateTime
.
您可以使用 DateTimeFormatterBuilder#parseDefaulting
将您的字符串解析为具有默认值的 OffsetDateTime
.
You can use DateTimeFormatterBuilder#parseDefaulting
to parse your string into an OffsetDateTime
with default values.
演示:
import java.time.LocalDate;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
import java.util.Locale;
import java.util.stream.Stream;
public class Main {
public static void main(String[] args) {
ZoneId zoneId = ZoneId.systemDefault();
LocalDate now = LocalDate.now(zoneId);
DateTimeFormatter dtf = new DateTimeFormatterBuilder()
.appendPattern("uuuu[-MM[-dd]]['T'HH[:mm[:ss[.SSSSSSSSS][.SSSSSSSS][.SSSSSSS][.SSSSSS][.SSSSS][.SSSS][.SSS][.SS][.S]]]][XXX]")
.parseDefaulting(ChronoField.MONTH_OF_YEAR, now.getMonthValue())
.parseDefaulting(ChronoField.DAY_OF_MONTH, now.getDayOfMonth())
.parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
.parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
.parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
.parseDefaulting(ChronoField.NANO_OF_SECOND, 0)
.parseDefaulting(ChronoField.OFFSET_SECONDS, 0)
.toFormatter(Locale.ENGLISH);
//Test
Stream.of(
"1997",
"1997-07",
"1997-07-16",
"1997-07-16T19:20+01:00",
"1997-07-16T19:20:30+01:00",
"1997-07-16T19:20:30.45+01:00"
).forEach(s -> System.out.println(OffsetDateTime.parse(s, dtf)));
}
}
输出:
1997-05-21T00:00Z
1997-07-21T00:00Z
1997-07-16T00:00Z
1997-07-16T19:20+01:00
1997-07-16T19:20:30+01:00
1997-07-16T19:20:30.450+01:00
输出中的 Z
是 时区指示符 用于零时区偏移.它代表祖鲁语并指定 Etc/UTC
时区(时区偏移为 +00:00
小时).
The Z
in the output is the timezone designator for zero-timezone offset. It stands for Zulu and specifies the Etc/UTC
timezone (which has the timezone offset of +00:00
hours).
了解有关 java.time
的更多信息,现代日期时间 API* 来自 跟踪:日期时间.
Learn more about java.time
, the modern date-time API* from Trail: Date Time.
* 出于任何原因,如果您必须坚持使用 Java 6 或 Java 7,您可以使用 ThreeTen-Backport 将大部分 java.time 功能向后移植到 Java 6 &7. 如果您正在为 Android 项目工作并且您的 Android API 级别仍然不符合 Java-8,请检查 Java 8+ API 可通过 desugaring 和 如何在 Android 项目中使用 ThreeTenABP.
* For any reason, if you have to stick to Java 6 or Java 7, you can use ThreeTen-Backport which backports most of the java.time functionality to Java 6 & 7. If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.
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