java新时间类
2020-04-03 16:12:08来源:博客园 阅读 ()
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
}
原文链接:https://www.cnblogs.com/moyuduo/p/12629419.html
如有疑问请与原作者联系
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