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java新时间类

时间

java8以前使用的时间很多方法都已经废弃了，而且不是线程安全的，java8提供了一系列的时间类，这些时间类都是线程安全的

LocalDate、LocalTime、LocalDateTime

这三个关于时间的类在使用上都类似

/**  	 * LocalDate  	 */  @Test  public void test1() {    LocalDate date1 = LocalDate.now();    System.out.println(date1);//2020-03-30      LocalDate plusYears = date1.plusYears(1);    System.out.println(plusYears);//2021-03-30      LocalDate minusDays = date1.minusDays(2);    System.out.println(minusDays);//2020-03-28      LocalDate date2 = LocalDate.of(2019, 3, 30);    System.out.println(date2.getYear());//2019  }    /**  	 * LocalTime  	 */  @Test  public void test2() {    LocalTime now = LocalTime.now();    System.out.println(now);//21:15:23.418      int minute = now.getMinute();    System.out.println(minute);//15      int second = now.getSecond();    System.out.println(second);//23      LocalTime of = LocalTime.of(10, 10, 10);    System.out.println(of);//10:10:10      LocalTime minusMinutes = of.minusMinutes(2);    System.out.println(minusMinutes);//10:08:10      LocalTime plusHours = of.plusHours(2);    System.out.println(plusHours);//12:10:10  }    /**  	 * LocalDateTime  	 */  @Test  public void test3() {    LocalDateTime now = LocalDateTime.now();    System.out.println(now);//2020-03-30T21:20:37.961      int minute = now.getMinute();    System.out.println(minute);//20      LocalDateTime plusMinutes = now.plusMinutes(20);    System.out.println(plusMinutes);//2020-03-30T21:40:37.961      LocalDateTime minusYears = now.minusYears(2);    System.out.println(minusYears);//2018-03-30T21:20:37.961      LocalDateTime of = LocalDateTime.of(2021, 3, 30, 21, 19, 50);    System.out.println(of);//2021-03-30T21:19:50  }

时间戳

/**  	 * Instant  	 */  @Test  public void test4() {    Instant now = Instant.now();    System.out.println(now);//2020-03-30T13:26:10.640Z      Instant plusSeconds = now.plusSeconds(10);    System.out.println(plusSeconds);//2020-03-30T13:26:20.640Z      //获取时间戳相对于1970年0时0分0秒的毫秒数    long epochMilli = plusSeconds.toEpochMilli();    System.out.println(epochMilli);//1585574780640  }

Duration获取时间间隔

/**  	 * Duration  	 */  @Test  public void test5() {    Instant start = Instant.now();    Instant end = start.plusSeconds(10);    Duration duration = Duration.between(start, end);    long seconds = duration.getSeconds();    //获取时间间隔的秒数    System.out.println(seconds);//10      //获取时间间隔的毫秒数    long millis = duration.toMillis();    System.out.println(millis);//10000  }

Peroid获取日期间隔

@Test  public void test6() {    LocalDate date1 = LocalDate.now();    LocalDate date2 = date1.plusYears(2);    Period period = Period.between(date1, date2);    //获取两时间间隔的月数,指两个月份的间隔数，并不是时间间隔的总月数    int months = period.getMonths();    System.out.println(months);//0  }

TemporalAdjuster矫正日期

@Test  public void test7() {    LocalDate date1 = LocalDate.now();    System.out.println(date1);//2020-03-31      //TemporalAdjusters类中封装了一些常用地时间矫正方法    TemporalAdjuster next = TemporalAdjusters.next(DayOfWeek.FRIDAY);    LocalDate date2 = date1.with(next);    System.out.println(date2);//2020-04-03      //自定义时间矫正器    LocalDate date3 = date1.with(x->{      LocalDate ld=(LocalDate)x;      DayOfWeek dayOfWeek = ld.getDayOfWeek();      if(dayOfWeek.equals(DayOfWeek.FRIDAY)) {        return ld.plusDays(3);      }else if(dayOfWeek.equals(DayOfWeek.SATURDAY)) {        return ld.plusDays(2);      }else {        return ld.plusDays(1);      }    });    System.out.println(date3);//2020-04-01  }

由于TemporalAdjuster是一个函数式接口，所以我们可以使用lambda表达式自定义矫正规则

@FunctionalInterface  public interface TemporalAdjuster {    Temporal adjustInto(Temporal temporal);  }

DateTimeFormatter格式化日期时间

@Test  public void test8() {    LocalDateTime dateTime1 = LocalDateTime.now();    System.out.println(dateTime1);//2020-03-31T18:28:04.256      DateTimeFormatter formatter1 = DateTimeFormatter.ISO_DATE;    String format1 = dateTime1.format(formatter1);    System.out.println(format1);//2020-03-31      DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("yyyy年MM月dd日HH时mm分ss秒");    String format2 = dateTime1.format(formatter2);    System.out.println(format2);//2020年03月31日18时28分04秒      LocalDateTime dateTime2 = LocalDateTime.parse(format2, formatter2);    System.out.println(dateTime2);//2020-03-31T18:28:04  }

ZoneDate

@Test  public void test9() {    //获取可用时区    ZoneId.getAvailableZoneIds().forEach(System.out::println);      LocalDate date1 = LocalDate.now(ZoneId.of("Asia/Tokyo"));    System.out.println(date1);//2020-03-31  }

ZoneTime

@Test  public void test10() {    LocalTime time1 = LocalTime.now(ZoneId.of("Asia/Tokyo"));    System.out.println(time1);//19:44:15.228      OffsetTime atOffset = time1.atOffset(ZoneOffset.ofHours(2));    System.out.println(atOffset);//19:44:15.228+02:00  }

ZoneDateTime

@Test  public void test11() {    LocalDateTime dateTime1 = LocalDateTime.now(ZoneId.of("Asia/Shanghai"));    System.out.println(dateTime1);//2020-03-31T18:51:07.136      ZonedDateTime atZone = dateTime1.atZone(ZoneId.of("Asia/Shanghai"));    System.out.println(atZone);//2020-03-31T18:51:07.136+08:00[Asia/Shanghai]	+09:00表示时间比格林尼治时间快9小时  }

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