Java和Android中的SimpleDateFormat是否不同? [英] Is SimpleDateFormat in Java and Android different?

问题描述

1. 当我们从JVM调用parseJavaAndroid("2018-04-27T22:31:07.962-05:00")时，它给出ParseException，而从Emulator/Android Real设备中进行调用时，它可以正常工作.

1. When we call parseJavaAndroid("2018-04-27T22:31:07.962-05:00") from JVM it gives ParseException while a call from Emulator/Android Real device it works fine.

当我们在Android中将SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ", Locale.ENGLISH)更改为SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)时，它会抛出:

When we change SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ", Locale.ENGLISH) to SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH) in Android, it throws:

带有消息未知模式字符'X'方法"的IllegalArgumentException.

IllegalArgumentException with message "Unknown pattern character 'X' method".

它在JVM中运行良好，并在Emulator/Android Real设备中提供ParseException.

It works fine in JVM and gives ParseException in Emulator/Android Real device.

public static Date parseJavaAndroid(String fromDate){
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ", Locale.ENGLISH);
    Date date=null;
    try {
        date = format.parse(fromDate);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return date;
}

该怎么办，它才能在JVM和android实时设备( minSdkVersion:19 )中工作.我想要用于"2018-04-27T22:31:07.962-05:00"的模式，该模式可同时在Android和Java上使用.

What should have to do then it works in both JVM and android real time device(minSdkVersion:19). I want pattern for "2018-04-27T22:31:07.962-05:00" which works on both Android as well as Java.

注意:个人模式有效，因此请不要为个人提供建议.

Note: The individual pattern is working, so Please don't suggest for individuals.

推荐答案

我无法讲述Android，但是在JVM中，Z模式仅识别没有:的偏移量，例如-0500，而X模式可以识别-05:00: https ://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

I can't tell about Android, but in the JVM, the Z pattern recognizes only offsets without :, such as -0500, while the X pattern can recognize -05:00: https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

也许Android具有不同的实现方式，其中Z还可以识别:的偏移量，例如-05:00.

Perhaps Android has a different implementation, where Z also recognizes offsets with :, such as -05:00.

恐怕没有一种完全适合所有人的解决方案:Z在JVM中不起作用，X在Android中不起作用，如何使其在两种环境中都能起作用?我认为您最好的办法是尝试两种模式，如下所示(用伪代码):

I'm afraid there's no one-pattern-fits-all solution: Z doesn't work in JVM, X doesn't work in Android, how to make it work in both? I think the best you can do is to try both patterns, something like this (in pseudocode):

try {
    parse with X
} catch(Exception e) {
    X didn't work, parse with Z
}

更好的另一种选择是使用三个反向端口，使用 ThreetenABP 配置-或使用

A much better alternative is to use the threeten backport and configure with ThreetenABP - or use java.time classes if your API level is 26:

// parse input
OffsetDateTime odt = OffsetDateTime.parse("2018-04-27T22:31:07.962-05:00");

// convert to java.util.Date (threeten backport)
Date date = DateTimeUtils.toDate(odt.toInstant());

// or, if you have java.time (API level 26)
Date date = date.from(odt.toInstant());

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