将 SQL 时间戳转换为 Java OffsetDateTime。

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英文:

Convert a sql timestamp to java OffsetDateTime

问题

我需要将一些时间戳转换为 Java 中的 OffsetDateTime。例如,我有以下时间:

2020-07-31 13:15:00.000000000 -03:00

我应该使用 SimpleDateFormat 来格式化这个时间,还是使用其他更直观的辅助方法?

英文:

I need to convert some timestamps to OffsetDateTime in java. For example, I have the following time:

2020-07-31 13:15:00.000000000 -03:00

Should I use SimpleDateFormat to format this or some other helpers that are more straightforward?

答案1

得分: 1

你需要使用DateTimeFormatter(用于现代日期时间类的解析和格式化API),如下所示:

import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        OffsetDateTime odt = OffsetDateTime.parse("2020-07-31 13:15:00.000000000 -03:00",
                DateTimeFormatter.ofPattern("u-M-d H:m:s.n ZZZZZ"));
        System.out.println(odt);
    }
}

输出:

2020-07-31T13:15-03:00

有关更多详细信息,请查阅 DateTimeFormatter 的文档。您还可以查看 Trail: Date Time 以了解更多关于现代日期时间API的信息。

注意: java.util 日期时间类已过时且容易出错,它们的格式化API SimpleDateFormat 也是如此。您应该完全停止使用它们。此外,OffsetDateTime 是现代日期时间API的一部分,而 SimpleDateFormat 则不适用于它。

如果您正在为Android项目进行操作,而您的Android API级别仍不符合Java-8,请查看 通过 desugaring 使用 Java 8+ API如何在Android项目中使用 ThreeTenABP

英文:

You need to use DateTimeFormatter (the parsing and formatting API for the the modern date-time classes) as shown below:

import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
	public static void main(String[] args) {
		OffsetDateTime odt = OffsetDateTime.parse("2020-07-31 13:15:00.000000000 -03:00",
				DateTimeFormatter.ofPattern("u-M-d H:m:s.n ZZZZZ"));
		System.out.println(odt);
	}
}

Output:

2020-07-31T13:15-03:00

Check the documentation of DateTimeFormatter for more details on it. You can also check Trail: Date Time to learn more about the modern date-time API.

Note: java.util date-time classes are outdated and error-prone and so is their formatting API, SimpleDateFormat. You should stop using them completely. Moreover, OffsetDateTime is part of the modern date-time API and SimpleDateFormat doesn't fit with it.

If you are doing it for your 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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  • 本文由 发表于 2020年10月7日 03:42:54
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