java 格式化时如何从Java 8中的日期获取月份的全名
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How to get full name of month from date in Java 8 while formatting
提问by Apurva Singh
Using new Java 8 java.time API, I need to convert LocalDate and get full name of month and day. Like March (not Mar), and Monday (not Mon). Friday the 13th March should be formatted like Friday, 13 March.. not Fri, 13 Mar.
使用新的 Java 8 java.time API，我需要转换 LocalDate 并获取月和日的全名。像三月（不是三月）和星期一（不是星期一）。3 月 13 日星期五的格式应类似于 3 月 13 日星期五……而不是 3 月 13 日星期五。
回答by Joe C
回答by Basil Bourque
tl;dr
tl;博士
Use automatic localization. No need to specify formatting pattern.
使用自动本地化。无需指定格式模式。
localDate.format(
DateTimeFormatter.ofLocalizedDate( FormatStyle.FULL )
.withLocale( Locale.UK )
)
Monday, 23 January 2017
2017 年 1 月 23 日，星期一
LocalDate
.of( 2017 , Month.JANUARY , 23 )
.getMonth()
.getDisplayName(
TextStyle.FULL ,
Locale.CANADA_FRENCH
)
janvier
詹维尔
Month
月
Taking your title literally, I would use the handy Monthenum.
从字面上看你的标题，我会使用方便的Month枚举。
LocalDate ld = LocalDate.of( 2017 , Month.JANUARY , 23 );
Month month = ld.getMonth() ; // Returns a `Month` object, whereas `getMonthValue` returns an integer month number (1-12).
Let java.time do the work of automatically localizing. To localize, specify:
让 java.time 做自动本地化的工作。要本地化，请指定：
TextStyleto determine how long or abbreviated should the string be.Localeto determine (a) the human language for translation of name of day, name of month, and such, and (b) the cultural norms deciding issues of abbreviation, capitalization, punctuation, separators, and such.
For example:
例如：
String output = month.getDisplayName( TextStyle.FULL , Locale.CANADA_FRENCH ) ; // Or Locale.US, Locale.KOREA, etc.
janvier
詹维尔
Date
日期
If you want the entire date localized, let DateTimeFormatterdo the work. Here we use FormatStylerather than TextStyle.
如果您想要本地化整个日期，让我们DateTimeFormatter来做这项工作。这里我们使用FormatStyle而不是TextStyle。
Example:
例子：
Locale l = Locale.CANADA_FRENCH ; // Or Locale.US, Locale.KOREA, etc.
DateTimeFormatter f = DateTimeFormatter.ofLocalizedDate( FormatStyle.FULL )
.withLocale( l ) ;
String output = ld.format( f );
dimanche 23 janvier 2107
2107 年 1 月 23 日
About java.time
关于java.time
The java.timeframework is built into Java 8 and later. These classes supplant the troublesome old legacydate-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
该java.time框架是建立在Java 8和更高版本。这些类取代了麻烦的旧的遗留日期时间类，例如java.util.Date, Calendar, & SimpleDateFormat。
The Joda-Timeproject, now in maintenance mode, advises migration to the java.timeclasses.
现在处于维护模式的Joda-Time项目建议迁移到java.time类。
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
要了解更多信息，请参阅Oracle 教程。并在 Stack Overflow 上搜索许多示例和解释。规范是JSR 310。
You may exchange java.timeobjects directly with your database. Use a JDBC drivercompliant with JDBC 4.2or later. No need for strings, no need for java.sql.*classes.
您可以直接与数据库交换java.time对象。使用符合JDBC 4.2或更高版本的JDBC 驱动程序。不需要字符串，不需要类。java.sql.*
Where to obtain the java.time classes?
从哪里获得 java.time 类？
- Java SE 8, Java SE 9, Java SE 10, and later
- Built-in.
- Part of the standard Java API with a bundled implementation.
- Java 9 adds some minor features and fixes.
- Java SE 6and Java SE 7
- Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
- Android
- Later versions of Android bundle implementations of the java.time classes.
- For earlier Android (<26), the ThreeTenABPproject adapts ThreeTen-Backport(mentioned above). See How to use ThreeTenABP….
- Java SE 8、Java SE 9、Java SE 10及更高版本
- 内置。
- 具有捆绑实现的标准 Java API 的一部分。
- Java 9 添加了一些小功能和修复。
- Java SE 6和Java SE 7
- 多的java.time功能后移植到Java 6和7在ThreeTen-反向移植。
- 安卓
- 更高版本的 Android 捆绑实现 java.time 类。
- 对于早期的 Android（<26），ThreeTenABP项目采用了ThreeTen-Backport（上面提到过）。请参阅如何使用ThreeTenABP ...。
The ThreeTen-Extraproject extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.
该ThreeTen-额外项目与其他类扩展java.time。该项目是未来可能添加到 java.time 的试验场。你可能在这里找到一些有用的类，比如Interval，YearWeek，YearQuarter，和更多。
回答by Dennis
Yes. Now it can be done.
是的。现在可以做到了。
LocalDate dd = new LocalDate(); //pass in a date value or params(yyyy,mm)
String ss = dd.monthOfYear.getAsText(); // will give the full name of the month
String sh = dd.monthOfYear.getAsShortText(); // shortform
