基于jdk8的实用时间工具类, 已经经过多个项目的考验与完善, 包含我的心得体会

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版本说明
2020-07-02 初次提交 (写于2019年)

简介
本文提供一个全面的基于jdk8的时间工具类。Talk is cheap, let’s Getting Started.

1. 直接上代码

　
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.util.Date;
import java.util.TimeZone;import static java.time.format.ResolverStyle.STRICT;/*** <h3>时间工具类</h3>* <p>* <ul>* <li>u means year(year-proleptic) which can be negative<br/>* <li>y means year-of-era which con't be negative* </ul>*  example:<br/>*  1 in "u" equal to 1 AD in "y G"<br/>*  0 in "u" equal to 1 BC in "y G"<br/>*  -1 in "u" equal to 2 BC in "y G"* <p>** @author zhouyou* @date 2019/10/28 18:18* @email zhouyouchn@126.com*/
public class TimeUtils {static {/*** 中国曾实行过夏令时(1986-1991) Asia/Shanghai会处理夏令时 而GMT+8不会* 设置JVM时区 避免docker等采用UTC*/TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));}/*** maybe we can set DEFAULT_ZONE_ID = ZoneOffset.ofHours(8);* or we can set DEFAULT_ZONE_ID = ZoneId.of("Asia/Shanghai");*/public static final ZoneId DEFAULT_ZONE_ID = ZoneId.systemDefault();/*** 东八区 并不能完全代表北京时间** @see #DEFAULT_ZONE_ID* @see #getDefaultZoneOffset(LocalDateTime)* @see #getDefaultZoneOffset(Instant)*/@Deprecatedpublic static final ZoneOffset DEFAULT_ZONE_OFFSET = ZoneOffset.ofHours(8);public static final String DAY_BEGIN_TIME = " 00:00:00";public static final String DAY_END_TIME = " 23:59:59";public static final DateTimeFormatter ISO_DATE_TIMESTAMP = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss.SSS").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_DATE_TIME = DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm:ss").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_DATE = DateTimeFormatter.ofPattern("uuuu-MM-dd").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_TIME = DateTimeFormatter.ofPattern("HH:mm:ss").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_MONTHDAY = DateTimeFormatter.ofPattern("MM-dd").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_DATE_WITHOUT_HYPHEN = DateTimeFormatter.ofPattern("uuuuMMdd").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);public static final DateTimeFormatter ISO_DATETIME_WITHOUT_HYPHEN = DateTimeFormatter.ofPattern("uuuuMMddHHmmss").withResolverStyle(STRICT).withZone(DEFAULT_ZONE_ID);/*** <p>* <b>脱离时间谈ZoneOffset毫无意义</b><br/>* see: 日光节约时间DST(夏令时)* example: 在一年中, 洛杉矶一段时间为"-8", 一段时间为"-7"* </p>** @param localDateTime* @return*/private static ZoneOffset getDefaultZoneOffset(LocalDateTime localDateTime) {return DEFAULT_ZONE_ID.getRules().getOffset(localDateTime);}/*** @param instant* @return* @see #getDefaultZoneOffset(LocalDateTime)*/private static ZoneOffset getDefaultZoneOffset(Instant instant) {return DEFAULT_ZONE_ID.getRules().getOffset(instant);}/*** LocalDateTime 和 Date的相互转换*/public static Date toDate(LocalDateTime localDateTime) {return localDateTime == null ? null : Date.from(localDateTime.atZone(DEFAULT_ZONE_ID).toInstant());}public static LocalDateTime toLocalDateTime(Date date) {return date == null ? null : toInstant(date).atZone(DEFAULT_ZONE_ID).toLocalDateTime();}/*** LocalDate 和 Date的相互转换*/public static Date toDate(LocalDate localDate) {return localDate == null ? null : Date.from(localDate.atStartOfDay(DEFAULT_ZONE_ID).toInstant());}public static LocalDate toLocalDate(Date date) {return date == null ? null : toInstant(date).atZone(DEFAULT_ZONE_ID).toLocalDate();}/*** LocalTime 和 Date的相互转换*/public static Date toDate(LocalTime localTime) {return localTime == null ? null : Date.from(localTime.atDate(LocalDate.now()).atZone(DEFAULT_ZONE_ID).toInstant());}public static Date toTime(LocalTime localTime) {return localTime == null ? null : Date.from(localTime.atDate(LocalDate.ofEpochDay(0L)).atZone(DEFAULT_ZONE_ID).toInstant());}public static LocalTime toLocalTime(Date date) {return date == null ? null : toInstant(date).atZone(DEFAULT_ZONE_ID).toLocalTime();}/*** 不直接使用toInstant防止java.sql.Time或java.sql.Date抛出异常* Instant instant;* if (date instanceof java.sql.Time || date instanceof java.sql.Date) {* Calendar calendar = Calendar.getInstance();* calendar.setTime(date);* instant = calendar.toInstant();* } else {* instant = date.toInstant();* }* return instant;** @param date* @return*/private static Instant toInstant(Date date) {return Instant.ofEpochMilli(date.getTime());}/*** @param date* @return <b>yyyy-MM-dd HH:mm:ss</b>*/public static String format(Date date) {return format(date, null);}public static String format(Date date, DateTimeFormatter formatter) {formatter = defaultDateTimeFormatter(formatter);return formatter.format(toLocalDateTime(date));}/*** @param localDateTime* @return <b>yyyy-MM-dd HH:mm:ss</b>*/public static String format(LocalDateTime localDateTime) {return format(localDateTime, null);}/*** @param localDateTime* @param formatter     默认yyyy-MM-dd HH:mm:ss* @return*/public static String format(LocalDateTime localDateTime, DateTimeFormatter formatter) {formatter = defaultDateTimeFormatter(formatter);return formatter.format(localDateTime);}/*** @param localDate* @return <b>yyyy-MM-dd</b>*/public static String format(LocalDate localDate) {return format(localDate, null);}/*** @param localDate* @param formatter 默认yyyy-MM-dd* @return*/public static String format(LocalDate localDate, DateTimeFormatter formatter) {formatter = defaultDateFormatter(formatter);return formatter.format(localDate);}/*** @param text yyyy-MM-dd HH:mm:ss* @return*/public static LocalDateTime parse2LocalDateTime(String text) {return parse2LocalDateTime(text, null);}/*** @param text* @param formatter 默认yyyy-MM-dd HH:mm:ss* @return*/public static LocalDateTime parse2LocalDateTime(String text, DateTimeFormatter formatter) {formatter = defaultDateTimeFormatter(formatter);return LocalDateTime.parse(text, formatter);}/*** @param text yyyy-MM-dd HH:mm:ss* @return*/public static Date parse2Date(String text) {return toDate(parse2LocalDateTime(text));}/*** @param text yyyy-MM-dd* @return*/public static LocalDate parse2LocalDate(String text) {return parse2LocalDate(text, null);}/*** @param text* @param formatter 默认yyyy-MM-dd* @return*/public static LocalDate parse2LocalDate(String text, DateTimeFormatter formatter) {formatter = defaultDateFormatter(formatter);return LocalDate.parse(text, formatter);}/*** @param text MM-dd* @return*/public static MonthDay parseMonthDay(String text) {return parseMonthDay(text, null);}/*** @param text MM-dd* @return*/public static MonthDay parseMonthDay(String text, DateTimeFormatter formatter) {formatter = defaultMonthDayFormatter(formatter);return MonthDay.parse(text, formatter);}/*** other way 1: return localDateTime.toInstant(DEFAULT_ZONE_OFFSET).toEpochMilli();* other way 2: return Timestamp.valueOf(localDateTime).getTime();** @param localDateTime* @return*/public static long getTime(LocalDateTime localDateTime) {// Instant效率高于Timestampreturn localDateTime.atZone(DEFAULT_ZONE_ID).toInstant().toEpochMilli();}/*** 根据{@link #DEFAULT_ZONE_ID}进行时间戳解析** @param timeMillis ms* @return*/public static LocalDateTime parseTime(long timeMillis) {return LocalDateTime.ofInstant(Instant.ofEpochMilli(timeMillis), DEFAULT_ZONE_ID);}/*** <b>固定偏移量</b>* 根据DEFAULT_ZONE_OFFSET进行时间戳解析** @param timeMillis ms* @return* @see #parseTime(long)*/@Deprecatedpublic static LocalDateTime parseTimeFast(long timeMillis) {int nanoOfSecond = (int) Math.floorMod(timeMillis, 1000) * 1000_000;long epochSecond = Math.floorDiv(timeMillis, 1000);return LocalDateTime.ofEpochSecond(epochSecond, nanoOfSecond, DEFAULT_ZONE_OFFSET);}/*** <b>时间间隔</b>* <p>* 选择ChronoUnit是因为:<br/>* Duration和Period会计算各个时间差，但并不会整合，* 这意味着：如果相差2个月0天，获取的相差天数是0* <p/>** @param temporal1* @param temporal2* @param unit* @return*/public static long between(Temporal temporal1, Temporal temporal2, ChronoUnit unit) {return unit.between(temporal1, temporal2);}/*** @return <b>yyyy-MM-dd HH:mm:ss</b>*/public static String now() {return now(null);}/*** @return <b>yyyy-MM-dd</b>*/public static String nowDate() {return LocalDate.now().format(ISO_DATE);}/*** @return <b>yyyy-MM-dd</b>*/public static String plusDate(long yearsToAdd, long monthsToAdd, long daysToAdd) {LocalDate now = LocalDate.now();if (yearsToAdd != 0) {now = now.plusYears(yearsToAdd);}if (monthsToAdd != 0) {now = now.plusMonths(monthsToAdd);}if (daysToAdd != 0) {now = now.plusDays(daysToAdd);}return now.format(ISO_DATE);}/*** @param formatter 默认yyyy-MM-dd HH:mm:ss* @return*/public static String now(DateTimeFormatter formatter) {formatter = defaultDateTimeFormatter(formatter);return LocalDateTime.now().format(formatter);}/*** @param text yyyy-MM-dd* @return*/public static Date getDayBegin(String text) {return toDate(LocalDateTime.of(LocalDate.parse(text, ISO_DATE), LocalTime.MIN));}/*** @param text yyyy-MM-dd* @return*/public static Date getDayEnd(String text) {return toDate(LocalDateTime.of(LocalDate.parse(text, ISO_DATE), LocalTime.MAX));}/*** @param localDate* @return*/public static Date getDayBegin(LocalDate localDate) {return toDate(LocalDateTime.of(localDate, LocalTime.MIN));}/*** @param localDate* @return*/public static Date getDayEnd(LocalDate localDate) {return toDate(LocalDateTime.of(localDate, LocalTime.MAX));}/*** @param localDateTime* @return*/public static Date getDayBegin(LocalDateTime localDateTime) {return getDayBegin(localDateTime.toLocalDate());}/*** @param localDateTime* @return*/public static Date getDayEnd(LocalDateTime localDateTime) {return getDayEnd(localDateTime.toLocalDate());}public static Date getDayBegin(Date date) {return toDate(LocalDateTime.of(toLocalDate(date), LocalTime.MIN));}public static Date getDayEnd(Date date) {return toDate(LocalDateTime.of(toLocalDate(date), LocalTime.MAX));}/*** @param text yyyy-MM-dd* @return*/@Deprecatedpublic static Date[] getDayBeginAndEnd(String text) {LocalDate localDate = LocalDate.parse(text, ISO_DATE);return getDaysByLocalDate(LocalDateTime.of(localDate, LocalTime.MIN), LocalDateTime.of(localDate, LocalTime.MAX));}@Deprecatedpublic static Date[] getDayBeginAndEnd(Date date) {LocalDate localDate = toLocalDate(date);return getDaysByLocalDate(LocalDateTime.of(localDate, LocalTime.MIN), LocalDateTime.of(localDate, LocalTime.MAX));}private static Date[] getDaysByLocalDate(LocalDateTime... localDateTimes) {Date[] dates = new Date[localDateTimes.length];for (int i = 0; i < dates.length; i++) {dates[i] = toDate(localDateTimes[i]);}return dates;}private static DateTimeFormatter defaultDateTimeFormatter(DateTimeFormatter formatter) {return formatter == null ? ISO_DATE_TIME : formatter;}private static DateTimeFormatter defaultDateFormatter(DateTimeFormatter formatter) {return formatter == null ? ISO_DATE : formatter;}private static DateTimeFormatter defaultMonthDayFormatter(DateTimeFormatter formatter) {return formatter == null ? ISO_MONTHDAY : formatter;}}

神奇的小尾巴：
本人邮箱：zhouyouchn@126.com zhoooooouyou@gmail.com
zhouyou@whut.edu.cn　欢迎交流，共同进步。
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