Java8 LocalDateTime與timestamp轉換
將timestamp轉為LocalDateTime
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public LocalDateTime timestamToDatetime(long timestamp){ Instant instant = Instant.ofEpochMilli(timestamp); return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()); } |
將LocalDataTime轉為timestamp
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public long datatimeToTimestamp(LocalDateTime ldt){ long timestamp = ldt.toInstant(ZoneOffset.of("+8")).toEpochMilli(); return timestamp; } |
我在網上還找到了另一個將datetime轉為時間戳的方法：
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ZoneId zone = ZoneId.systemDefault();long timestamp = ldt.atZone(zone).toInstant().toEpochMilli(); |
Java8的時間轉為時間戳的大概的思路就是LocalDateTime先轉為Instant，設置時區，然后轉timestamp。
附一個Java8中的LocalDateTime工具類
工具類
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package com.kingboy.common.utils.date;import java.time.*;import java.time.format.DateTimeFormatter;import java.time.temporal.ChronoUnit;import java.time.temporal.TemporalUnit;import java.util.Date;/* * @author kingboy * @Date 2017/7/22 下午2:12 * @Description LocalDateTimeUtils is used to Java8中的時間類 */public class LocalDateTimeUtils { //獲取當前時間的LocalDateTime對象 //LocalDateTime.now(); //根據年月日構建LocalDateTime //LocalDateTime.of(); //比較日期先后 //LocalDateTime.now().isBefore(), //LocalDateTime.now().isAfter(), //Date轉換為LocalDateTime public static LocalDateTime convertDateToLDT(Date date) { return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault()); } //LocalDateTime轉換為Date public static Date convertLDTToDate(LocalDateTime time) { return Date.from(time.atZone(ZoneId.systemDefault()).toInstant()); } //獲取指定日期的毫秒 public static Long getMilliByTime(LocalDateTime time) { return time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(); } //獲取指定日期的秒 public static Long getSecondsByTime(LocalDateTime time) { return time.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond(); } //獲取指定時間的指定格式 public static String formatTime(LocalDateTime time,String pattern) { return time.format(DateTimeFormatter.ofPattern(pattern)); } //獲取當前時間的指定格式 public static String formatNow(String pattern) { return formatTime(LocalDateTime.now(), pattern); } //日期加上一個數,根據field不同加不同值,field為ChronoUnit.* public static LocalDateTime plus(LocalDateTime time, long number, TemporalUnit field) { return time.plus(number, field); } //日期減去一個數,根據field不同減不同值,field參數為ChronoUnit.* public static LocalDateTime minu(LocalDateTime time, long number, TemporalUnit field){ return time.minus(number,field); } /** * 獲取兩個日期的差 field參數為ChronoUnit.* * @param startTime * @param endTime * @param field 單位(年月日時分秒) * @return */ public static long betweenTwoTime(LocalDateTime startTime, LocalDateTime endTime, ChronoUnit field) { Period period = Period.between(LocalDate.from(startTime), LocalDate.from(endTime)); if (field == ChronoUnit.YEARS) return period.getYears(); if (field == ChronoUnit.MONTHS) return period.getYears() * 12 + period.getMonths(); return field.between(startTime, endTime); } //獲取一天的開始時間，2017,7,22 00:00 public static LocalDateTime getDayStart(LocalDateTime time) { return time.withHour(0) .withMinute(0) .withSecond(0) .withNano(0); } //獲取一天的結束時間，2017,7,22 23:59:59.999999999 public static LocalDateTime getDayEnd(LocalDateTime time) { return time.withHour(23) .withMinute(59) .withSecond(59) .withNano(999999999); }} |
測試類
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package com.kingboy.common.localdatetimeutils;import com.kingboy.common.utils.date.LocalDateTimeUtils;import org.junit.Test;import java.time.LocalDateTime;import java.time.temporal.ChronoUnit;import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayEnd;import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayStart;/** * @author kingboy * @Date 2017/7/22 下午7:16 * @Description LocaDateTimeUtilsTest is used to 測試LocalDateTime工具 */public class LocaDateTimeUtilsTest { @Test public void format_test() { System.out.println(LocalDateTimeUtils.formatNow("yyyy年MM月dd日 HH:mm:ss")); } @Test public void betweenTwoTime_test() { LocalDateTime start = LocalDateTime.of(1993, 10, 13, 11, 11); LocalDateTime end = 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("小時:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.HOURS)); System.out.println("分鐘:" + 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 小時:9506 分鐘:570362 秒:34221720 毫秒:34221720000 */ } @Test public void plus_test() { //增加二十分鐘 System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(), 20, ChronoUnit.MINUTES), "yyyy年MM月dd日 HH:mm")); //增加兩年 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 public void dayStart_test() { System.out.println(getDayStart(LocalDateTime.now())); System.out.println(getDayEnd(LocalDateTime.now())); //============================================================================================= /* 2017-07-22T00:00 2017-07-22T23:59:59.999999999 */ }} |
總結
到此這篇關于Java8中LocalDateTime與時間戳timestamp互相轉換的文章就介紹到這了,更多相關Java8 LocalDateTime與timestamp轉換內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://blog.csdn.net/czx2018/article/details/85005466
