Java8中LocalDateTime与时间戳timestamp的互相转换
Java8LocalDateTime与timestamp转换
将timestamp转为LocalDateTime
publicLocalDateTimetimestamToDatetime(longtimestamp){
Instantinstant=Instant.ofEpochMilli(timestamp);
returnLocalDateTime.ofInstant(instant,ZoneId.systemDefault());
}
将LocalDataTime转为timestamp
publiclongdatatimeToTimestamp(LocalDateTimeldt){
longtimestamp=ldt.toInstant(ZoneOffset.of("+8")).toEpochMilli();
returntimestamp;
}
我在网上还找到了另一个将datetime转为时间戳的方法：
ZoneIdzone=ZoneId.systemDefault(); longtimestamp=ldt.atZone(zone).toInstant().toEpochMilli();
Java8的时间转为时间戳的大概的思路就是LocalDateTime先转为Instant，设置时区，然后转timestamp。
附一个Java8中的LocalDateTime工具类
工具类
packagecom.kingboy.common.utils.date;
importjava.time.*;
importjava.time.format.DateTimeFormatter;
importjava.time.temporal.ChronoUnit;
importjava.time.temporal.TemporalUnit;
importjava.util.Date;
/*
*@authorkingboy
*@Date2017/7/22下午2:12
*@DescriptionLocalDateTimeUtilsisusedtoJava8中的时间类
*/
publicclassLocalDateTimeUtils{
//获取当前时间的LocalDateTime对象
//LocalDateTime.now();
//根据年月日构建LocalDateTime
//LocalDateTime.of();
//比较日期先后
//LocalDateTime.now().isBefore(),
//LocalDateTime.now().isAfter(),
//Date转换为LocalDateTime
publicstaticLocalDateTimeconvertDateToLDT(Datedate){
returnLocalDateTime.ofInstant(date.toInstant(),ZoneId.systemDefault());
}
//LocalDateTime转换为Date
publicstaticDateconvertLDTToDate(LocalDateTimetime){
returnDate.from(time.atZone(ZoneId.systemDefault()).toInstant());
}
//获取指定日期的毫秒
publicstaticLonggetMilliByTime(LocalDateTimetime){
returntime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
//获取指定日期的秒
publicstaticLonggetSecondsByTime(LocalDateTimetime){
returntime.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond();
}
//获取指定时间的指定格式
publicstaticStringformatTime(LocalDateTimetime,Stringpattern){
returntime.format(DateTimeFormatter.ofPattern(pattern));
}
//获取当前时间的指定格式
publicstaticStringformatNow(Stringpattern){
returnformatTime(LocalDateTime.now(),pattern);
}
//日期加上一个数,根据field不同加不同值,field为ChronoUnit.*
publicstaticLocalDateTimeplus(LocalDateTimetime,longnumber,TemporalUnitfield){
returntime.plus(number,field);
}
//日期减去一个数,根据field不同减不同值,field参数为ChronoUnit.*
publicstaticLocalDateTimeminu(LocalDateTimetime,longnumber,TemporalUnitfield){
returntime.minus(number,field);
}
/**
*获取两个日期的差field参数为ChronoUnit.*
*@paramstartTime
*@paramendTime
*@paramfield单位(年月日时分秒)
*@return
*/
publicstaticlongbetweenTwoTime(LocalDateTimestartTime,LocalDateTimeendTime,ChronoUnitfield){
Periodperiod=Period.between(LocalDate.from(startTime),LocalDate.from(endTime));
if(field==ChronoUnit.YEARS)returnperiod.getYears();
if(field==ChronoUnit.MONTHS)returnperiod.getYears()*12+period.getMonths();
returnfield.between(startTime,endTime);
}
//获取一天的开始时间，2017,7,2200:00
publicstaticLocalDateTimegetDayStart(LocalDateTimetime){
returntime.withHour(0)
.withMinute(0)
.withSecond(0)
.withNano(0);
}
//获取一天的结束时间，2017,7,2223:59:59.999999999
publicstaticLocalDateTimegetDayEnd(LocalDateTimetime){
returntime.withHour(23)
.withMinute(59)
.withSecond(59)
.withNano(999999999);
}
}
测试类
packagecom.kingboy.common.localdatetimeutils;
importcom.kingboy.common.utils.date.LocalDateTimeUtils;
importorg.junit.Test;
importjava.time.LocalDateTime;
importjava.time.temporal.ChronoUnit;
importstaticcom.kingboy.common.utils.date.LocalDateTimeUtils.getDayEnd;
importstaticcom.kingboy.common.utils.date.LocalDateTimeUtils.getDayStart;
/**
*@authorkingboy
*@Date2017/7/22下午7:16
*@DescriptionLocaDateTimeUtilsTestisusedto测试LocalDateTime工具
*/
publicclassLocaDateTimeUtilsTest{
@Test
publicvoidformat_test(){
System.out.println(LocalDateTimeUtils.formatNow("yyyy年MM月dd日HH:mm:ss"));
}
@Test
publicvoidbetweenTwoTime_test(){
LocalDateTimestart=LocalDateTime.of(1993,10,13,11,11);
LocalDateTimeend=LocalDateTime.of(1994,11,13,13,13);
System.out.println("年:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.YEARS));
System.out.println("月:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.MONTHS));
System.out.println("日:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.DAYS));
System.out.println("半日:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.HALF_DAYS));
System.out.println("小时:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.HOURS));
System.out.println("分钟:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.MINUTES));
System.out.println("秒:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.SECONDS));
System.out.println("毫秒:"+LocalDateTimeUtils.betweenTwoTime(start,end,ChronoUnit.MILLIS));
//=============================================================================================
/*
年:1
月:13
日:396
半日:792
小时:9506
分钟:570362
秒:34221720
毫秒:34221720000
*/
}
@Test
publicvoidplus_test(){
//增加二十分钟
System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),
20,
ChronoUnit.MINUTES),"yyyy年MM月dd日HH:mm"));
//增加两年
System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),
2,
ChronoUnit.YEARS),"yyyy年MM月dd日HH:mm"));
//=============================================================================================
/*
2017年07月22日22:53
2019年07月22日22:33
*/
}
@Test
publicvoiddayStart_test(){
System.out.println(getDayStart(LocalDateTime.now()));
System.out.println(getDayEnd(LocalDateTime.now()));
//=============================================================================================
/*
2017-07-22T00:00
2017-07-22T23:59:59.999999999
*/
}
}
总结
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