java中将毫秒转换成时间_在Java中将时间单位转换为持续时间

Dear 丶 2023-02-25 03:57 29阅读 0赞

java中将毫秒转换成时间

`java.util.concurrent.TimeUnit`以给定的粒度单位表示Java中的持续时间，并提供跨单位转换的实用方法。 `java.util.concurrent.TimeUnit`最早是在Java早期（1.5）引入的，但自那时以来已经扩展了好几次。 在此博客文章中，您将学习如何使用`java.util.concurrent.TimeUnit`将给定的*时间单位*转换为*持续时间* 。

## 先决条件 ##

您需要JDK 11+才能运行示例。

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## 问题 ##

在Java中将给定的时间单位转换为持续时间

## 解 ##

使用`java.concurrent.TimeUnit`枚举。

## Java 11 ##

*  `TimeUnit.convert(Duration duration)` ：

long yearInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofDays( 365 ));  long hourInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofHours( 1 ));  long minuteInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofMinutes( 1 ));

*  使用`java.time.ChronoUnit` `TimeUnit.convert(Duration duration)` ：

long yearInMillis = TimeUnit.MILLISECONDS.convert(Duration.of( 365 , TimeUnit.DAYS.toChronoUnit()));  long hourInMillis = TimeUnit.MILLISECONDS.convert(Duration.of( 1 , TimeUnit.HOURS.toChronoUnit()));  long minuteInMillis = TimeUnit.MILLISECONDS.convert(Duration.of( 1 , TimeUnit.MINUTES.toChronoUnit()));

## Java 11之前的版本 ##

*  通用`TimeUnit.convert(long sourceDuration, TimeUnit sourceUnit)`

long yearInMillis = TimeUnit.DAYS.toMillis( 365 );  long hourInMillis = TimeUnit.HOURS.toMillis( 1 );  long minuteInMillis = TimeUnit.MINUTES.toMillis( 1 );

*  `TimeUnit.toMillis(long duration)` ， `TimeUnit.toSeconds(long duration)`等方法：

long yearInMillis = TimeUnit.MILLISECONDS.convert( 365 , TimeUnit.DAYS);  long hourInMillis = TimeUnit.MILLISECONDS.convert( 1 , TimeUnit.HOURS);  long minuteInMillis = TimeUnit.MILLISECONDS.convert( 1 , TimeUnit.MINUTES);

## 最后的例子 ##

class Java11TimeUnitConvertTests { 
         public static final long DAYS_IN_A_YEAR = 365L; 
         public static final long HOURS_IN_A_DAY = 24L; 
         public static final long MINUTES_IN_AN_HOUR = 60L; 
         public static final long SECONDS_IN_A_MINUTE = 60L; 
         public static final long MILLISECONDS_IN_A_SECOND = 1000L; 
         @Test 
         void aYearInMillis() { 
             // A year in milliseconds 
             long yearInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofDays( 365 )); // since Java 11 
             assertThat(yearInMillis) 
                     .isEqualTo(DAYS_IN_A_YEAR * HOURS_IN_A_DAY * MINUTES_IN_AN_HOUR * SECONDS_IN_A_MINUTE * MILLISECONDS_IN_A_SECOND) 
                     .isEqualTo(TimeUnit.DAYS.toMillis( 365 )) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert( 365 , TimeUnit.DAYS)) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert(Duration.of( 365 , TimeUnit.DAYS.toChronoUnit()))); // since Java 11 
         } 
         @Test 
         void anHourInMillis() { 
             long hourInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofHours( 1 )); // since Java 11         
             assertThat(hourInMillis) 
                     .isEqualTo(MINUTES_IN_AN_HOUR * SECONDS_IN_A_MINUTE * MILLISECONDS_IN_A_SECOND) 
                     .isEqualTo(TimeUnit.HOURS.toMillis( 1 )) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert( 1 , TimeUnit.HOURS)) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert(Duration.of( 1 , TimeUnit.HOURS.toChronoUnit()))); // since Java 11 
         } 
         @Test 
         void aMinuteInMillis() {         
             long minuteInMillis = TimeUnit.MILLISECONDS.convert(Duration.ofMinutes( 1 )); // since Java 11         
             assertThat(minuteInMillis) 
                     .isEqualTo(SECONDS_IN_A_MINUTE * MILLISECONDS_IN_A_SECOND) 
                     .isEqualTo(TimeUnit.MINUTES.toMillis( 1 )) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert( 1 , TimeUnit.MINUTES)) 
                     .isEqualTo(TimeUnit.MILLISECONDS.convert(Duration.of( 1 , TimeUnit.MINUTES.toChronoUnit()))); // since Java 11 
         } 
         @ParameterizedTest 
         @MethodSource ( "timeUnitToDuration" ) 
         void convertTimeUnitToDuration(TimeUnit unit, Duration duration, long expectedResult) { 
             long actualResult = unit.convert(duration); 
             assertThat(actualResult).isEqualTo(expectedResult); 
         } 
         private static Stream<Arguments> timeUnitToDuration() { 
             return Stream.of( 
                     Arguments.of(TimeUnit.DAYS, Duration.ofHours( 24 ), 1 ), // 24h = 1d 
                     Arguments.of(TimeUnit.DAYS, Duration.ofHours( 40 ), 1 ), // 40h = 1d 
                     Arguments.of(TimeUnit.DAYS, Duration.ofHours( 48 ), 2 ), // 48h = 2d 
                     Arguments.of(TimeUnit.DAYS, Duration.ofHours( 50 ), 2 ), // 50h = 2d 
                     Arguments.of(TimeUnit.MILLISECONDS, Duration.ofSeconds( 1 ), 1000 ), // 1s = 1000ms 
                     Arguments.of(TimeUnit.MILLISECONDS, Duration.ofSeconds( 11 ), 11000 ), // 1s = 11000ms 11000 // 1s = 11000ms 
                     Arguments.of(TimeUnit.SECONDS, Duration.ofHours( 1 ), 3600 ), // 1h = 3600s 
                     Arguments.of(TimeUnit.HOURS, Duration.ofSeconds(4_000), 1 ), // 4000s = 1h 
                     Arguments.of(TimeUnit.HOURS, Duration.ofSeconds(1_0000), 2 ) // 10000s = 2h 
             ); 
         }  }

## 源代码 ##

可以在Github上找到本文的源代码： [https][] : [//github.com/kolorobot/java9-and-beyond][https]

> 翻译自: [https://www.javacodegeeks.com/2020/05/convert-time-unit-to-duration-in-java.html][https_www.javacodegeeks.com_2020_05_convert-time-unit-to-duration-in-java.html]

java中将毫秒转换成时间

[https]: https://github.com/kolorobot/java9-and-beyond
[https_www.javacodegeeks.com_2020_05_convert-time-unit-to-duration-in-java.html]: https://www.javacodegeeks.com/2020/05/convert-time-unit-to-duration-in-java.html