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如何检查Calendar实例最初是否是错误的日期

分类: 技术问答 • 2022-04-19 18:30:32
问题描述：

我有一个Calendar实例，通过 javax.xml.bind.DatatypeConverter.parseDateTime 方法。

I have a Calendar instance, parsed from XSD datetime via the javax.xml.bind.DatatypeConverter.parseDateTime method by JAXB.

在运行时，我在网络服务中，我想知道原始xsd日期时间是否有效（月份< 12，日期< 31,30,29,28，根据月份......等等。示例：这是一个有效日期： 2015-07-30T09：32：05.543 + 02:00 ，这不是： 2015-07-35T09 ：32：05.543 + 02:00

At runtime, i'm in a web service, and i want to know if the original xsd datetime was valid (month < 12, day < 31, 30, 29, 28 according to month ...ect) or not. Example: this is a valid date: 2015-07-30T09:32:05.543+02:00 and this is not: 2015-07-35T09:32:05.543+02:00

我试图使用 setLenient 服务，但是当原始日期错误时似乎没有引发异常。

I tried to use setLenient on the instance in the web service, but it doesn't seem to raise an exception when the original date was wrong.

有没有办法做到这一点？我的猜测是告诉JAXB在 global.jaxb 文件中以正确的方式执行此操作，这是我现在使用的文件：

Is there any way to do it? My guess is to tell JAXB to do it the right way in the global.jaxb file, here's the one i use right now:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<jaxb:bindings version="2.0" xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
               xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc" xmlns:xs="http://www.w3.org/2001/XMLSchema"
               jaxb:extensionBindingPrefixes="xjc">
    <jaxb:globalBindings>
        <xjc:simple/>
        <xjc:serializable uid="-1"/>
        <jaxb:javaType name="java.util.Calendar" xmlType="xs:dateTime"
                       parseMethod="javax.xml.bind.DatatypeConverter.parseDateTime"
                       printMethod="javax.xml.bind.DatatypeConverter.printDateTime"/>
    </jaxb:globalBindings>
</jaxb:bindings>

任何帮助将不胜感激。谢谢。

Any help would be appreciated. Thanks.

答

tl; dr



tl;dr

OffsetDateTime.parse( "2015-07-35T09:32:05.543+02:00" ) 
    … catch ( DateTimeParseException e )



java.time



麻烦的旧日期时间类，例如 java.util.Date ， java.util.Calendar 和 java.text.SimpleDateFormat 现在遗产，取而代之的是 java.time 类Java 9.

java.time

The troublesome old date-time classes such as java.util.Date, java.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 & Java 9.

同样， Joda-时间项目现在处于维护模式，团队建议迁移到 java.time 类。

Likewise, the Joda-Time project is now in maintenance mode, with the team advising migration to the java.time classes.

要确定无效的日期时间字符串，请尝试解析并捕获异常。鉴于您的输入具有从UTC而非时区的偏移量，请解析为 OffsetDateTime 个对象。无效输入抛出 DateTimeParseException 。

To determine invalid date-time string, attempt to parse and trap for exception. Given that your inputs have an offset-from-UTC but not a time zone, parse as OffsetDateTime objects. Invalid inputs throw DateTimeParseException.

String inputGood = "2015-07-30T09:32:05.543+02:00" ;
String inputBad = "2015-07-35T09:32:05.543+02:00" ;

try{ 
    // Good
    OffsetDateTime odtGood = OffsetDateTime.parse( inputGood ) ;
    System.out.println( "odtGood.toString(): " + odtGood ) ;

    // Bad
    OffsetDateTime odtBad = OffsetDateTime.parse( inputBad ) ;
    System.out.println( "odtBad.toString(): " + odtBad ) ;
} catch ( DateTimeParseException e ) {
    System.out.println( e ) ;
}

参见代码在IdeOne.com上运行。


odtGood.toString（）：2015-07 -30T09：32：05.543 + 02:00

odtGood.toString(): 2015-07-30T09:32:05.543+02:00

java.time.format.DateTimeParseException：Text'2015-07-35T09：32：05.543 + 02:00'可能不被解析：DayOfMonth的值无效（有效值1 - 28/31）：35

java.time.format.DateTimeParseException: Text '2015-07-35T09:32:05.543+02:00' could not be parsed: Invalid value for DayOfMonth (valid values 1 - 28/31): 35





关于java.time



java.time 框架内置于Java 8及更高版本中。这些类取代了麻烦的旧遗留日期时间类，例如 java.util.Date ， 日历 ，& SimpleDateFormat 。

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

Joda-Time 项目，现在在维护模式，建议迁移到 java.time 类。

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

要了解更多信息，请参阅 Oracle教程。并搜索Stack Overflow以获取许多示例和解释。规范是 JSR 310 。

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

从哪里获取java.time类？

Where to obtain the java.time classes?


  • Java SE 8 ， Java SE 9 ，以及之后


    • 内置。

    • 带有捆绑实现的标准Java API的一部分。

    • Java 9添加了一些小功能和修复。

    • Java SE 8, Java SE 9, and later
      • Built-in.
      • Part of the standard Java API with a bundled implementation.
      • Java 9 adds some minor features and fixes.
      • Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
      • Later versions of Android bundle implementations of the java.time classes.
      • For earlier Android, the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….

      ThreeTen-Extra 项目使用其他类扩展java.time。该项目是未来可能添加到java.time的试验场。您可以在这里找到一些有用的课程，例如 Interval ， YearWeek ， YearQuarter ，更多。

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