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import org.junit.Test;import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.WeekFields;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;public class Java8DateUtil {public static final String yyyy_MM_dd_HH_mm_ss_SSS = "yyyy-MM-dd HH:mm:ss.SSS";public static final String yyyy_MM_dd_HH_mm_ss = "yyyy-MM-dd HH:mm:ss";public static final String yyyy_MM_dd_HH_mm = "yyyy-MM-dd HH:mm";public static final String yyyy_MM_dd_HH_mm_ss_cn = "yyyy年MM月dd日 HH时mm分ss秒";public static final String yyyy_MM_dd_HH_mm_cn = "yyyy年MM月dd日 HH时mm分";public static final String yyyy_MM_dd = "yyyy-MM-dd";public static final String yyyy_MM_dd_cn = "yyyy年MM月dd日";public static final String HH_mm_ss = "HH:mm:ss";public static final String HH_mm = "HH:mm";public static final String HH_mm_ss_cn = "HH时mm分ss秒";/*** parse datetime** @param datetime* @param formatter* @return*/public static LocalDateTime parseLocalDateTime(String datetime, String formatter) {return LocalDateTime.parse(datetime, DateTimeFormatter.ofPattern(formatter));}/*** parse date** @param date* @param formatter* @return*/public static LocalDate parseLocalDate(String date, String formatter) {return LocalDate.parse(date, DateTimeFormatter.ofPattern(formatter));}/*** parse time** @param time* @param formatter* @return*/public static LocalTime parseLocalTime(String time, String formatter) {return LocalTime.parse(time, DateTimeFormatter.ofPattern(formatter));}/*** format datetime** @param datetime* @param formatter* @return*/public static String formatLocalDateTime(LocalDateTime datetime, String formatter) {return datetime.format(DateTimeFormatter.ofPattern(formatter));}/*** format date** @param date* @param formatter* @return*/public static String formatLocalDate(LocalDate date, String formatter) {return date.format(DateTimeFormatter.ofPattern(formatter));}/*** format time** @param time* @param formatter* @return*/public static String formatLocalTime(LocalTime time, String formatter) {return time.format(DateTimeFormatter.ofPattern(formatter));}/*** 日期相隔天数** @param start* @param end* @return*/public static long betweenDays(LocalDate start, LocalDate end) {return ChronoUnit.DAYS.between(start, end);}/*** 日期相隔小时** @param start* @param end* @return*/public static long betweenHours(LocalDateTime start, LocalDateTime end) {return Duration.between(start, end).toHours();}/*** 日期相隔分钟** @param start* @param end* @return*/public static long betweenMinutes(LocalDateTime start, LocalDateTime end) {return Duration.between(start, end).toMinutes();}/*** 日期相隔毫秒数** @param start* @param end* @return*/public static long betweenMillis(LocalDateTime start, LocalDateTime end) {return Duration.between(start, end).toMillis();}/*** LocalDate --> Date** @param localDate* @return*/public static Date localDate2Date(LocalDate localDate) {return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());}/*** LocalDateTime --> Date** @param localDateTime* @return*/public static Date localDateTime2Date(LocalDateTime localDateTime) {return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());}/*** Date --> LocalDate** @param date* @return*/public static LocalDate date2LocalDate(Date date) {return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();}/*** Date --> LocalDateTime** @param date* @return*/public static LocalDateTime date2LocalDateTime(Date date) {return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();}/*** timeMillis --> LocalDate** @param timeMillis* @return*/public static LocalDate timeMillis2LocalDate(Long timeMillis) {return Instant.ofEpochMilli(timeMillis).atZone(ZoneId.systemDefault()).toLocalDate();}/*** timeMillis --> LocalTime** @param timeMillis* @return*/public static LocalTime timeMillis2LocalTime(Long timeMillis) {return Instant.ofEpochMilli(timeMillis).atZone(ZoneId.systemDefault()).toLocalTime();}/*** timeMillis --> LocalDateTime** @param timeMillis* @return*/public static LocalDateTime timeMillis2LocalDateTime(Long timeMillis) {return Instant.ofEpochMilli(timeMillis).atZone(ZoneId.systemDefault()).toLocalDateTime();}/*** LocalDate --> timeMillis** @param localDate* @return*/public static Long localDate2timeMillis(LocalDate localDate) {return localDate2Date(localDate).getTime();}/*** LocalTime --> timeMillis** @param localTime* @return*/public static Long localTime2timeMillis(LocalTime localTime) {return localDateTime2timeMillis(LocalDateTime.of(LocalDate.of(1970, 1, 1), localTime));}/*** LocalDateTime --> timeMillis** @param localDateTime* @return*/public static Long localDateTime2timeMillis(LocalDateTime localDateTime) {return localDateTime2Date(localDateTime).getTime();}/*** 获取2个日期之间的所有日期(闭区间(即: 包括首尾))** @param startDate* @param endDate* @return*/public static List<LocalDate> getDatesBetween2Dates(LocalDate startDate, LocalDate endDate) {if (startDate.isAfter(endDate)) {throw new RuntimeException("开始日期不能晚于结束日期");}List<LocalDate> localDates = new ArrayList<>();LocalDate item = startDate;while (!item.isAfter(endDate)) {localDates.add(item);item = item.plusDays(1);}return localDates;}/*** 获取2个日期之间的所有日期(闭区间(即: 包括首尾))** @param startDate* @param endDate* @return*/public static List<LocalDate> getDatesBetween2DatesV2(LocalDate startDate, LocalDate endDate) {if (startDate.isAfter(endDate)) {throw new RuntimeException("开始日期不能晚于结束日期");}return Stream.iterate(startDate, date -> date.plusDays(1)).limit(ChronoUnit.DAYS.between(startDate, endDate) + 1).collect(Collectors.toList());}/*** 该日期所在月份的第一天** @param date* @return*/public static LocalDate getFirstDateOfMonth(LocalDate date) {return LocalDate.of(date.getYear(), date.getMonthValue(), 1);}/*** 该日期所在月份的最后一天** @param date* @return*/public static LocalDate getLastDateOfMonth(LocalDate date) {return LocalDate.of(date.getYear(), date.getMonthValue(), date.lengthOfMonth());}/*** 该日期所在的周在一年当中是第几周(这里的周指 ISO 标准周)** @param date 指定日期* @return*/public static int getWeekOfWeekBasedYear(LocalDate date) {/** ISO标准周: 周一为每周的第一天 */// 第一周: 本年度第一个至少有 4 天的周,WeekFields 源码中也是这样定义的: WeekFields ISO = new WeekFields(DayOfWeek.MONDAY, 4));// 至少有 4 天,换句话说就是本年度就是第一个周四所在的周;// 第一周和最后一周是有可能跨年的,示例: 2025年的第一周为: 2024-12-30 ~ 2025-01-05;/** SUNDAY_START: 周日为每周的第一天,适用于北美和部分欧洲国家 */// 第一周: 第一个至少有 1 天的周return date.get(WeekFields.ISO.weekOfWeekBasedYear());}/*** 该日期所在的周对应的年份(这里的周指 ISO 标准周)* 第一周和最后一周是有可能跨年的,示例: 2025年的第一周为: 2024-12-30 ~ 2025-01-05;因此 2024-12-30 和 2024-12-31 所在周对应的年份也是 2025** @param date 指定日期* @return*/public static int getWeekBasedYear(LocalDate date) {return date.get(WeekFields.ISO.weekBasedYear());}/*** 查看指定年份指定周对应的周一(这里的周指 ISO 标准周)** @param year 示例: 2024* @param weekOfYear 第几周* @return*/public static LocalDate getMondayByWeekOfYear(int year, int weekOfYear) {// 获取指定年份的第一天LocalDate firstDayOfYear = LocalDate.of(year, 1, 1);// 第一个周四LocalDate firstThursday = firstDayOfYear.with(TemporalAdjusters.nextOrSame(DayOfWeek.THURSDAY));// 第一个周一LocalDate mondayOfFirstWeek = firstThursday.minusDays(3);return mondayOfFirstWeek.plusWeeks(weekOfYear - 1);}/*** 该日期所在周的周一** @param date* @return*/public static LocalDate getDateOfMonday(LocalDate date) {return date.minusDays(date.getDayOfWeek().getValue() - 1);}/*** 该日期所在周的周日** @param date* @return*/public static LocalDate getDateOfSunday(LocalDate date) {return date.plusDays(7 - date.getDayOfWeek().getValue());}/*** 某天的 00:00:00** @param date* @return*/public static LocalDateTime getDayBegin(LocalDate date) {return LocalDateTime.of(date, LocalTime.of(0, 0, 0));}/*** 某天的 23:59:59** @param date* @return*/public static LocalDateTime getDayEnd(LocalDate date) {return LocalDateTime.of(date, LocalTime.of(23, 59, 59));}/*** 该日期所在的季度** @param date 指定日期* @return 1, 2, 3, 4*/public static Integer getQuarter(LocalDate date) {return (int) Math.ceil(LocalDate.now().getMonthValue() / 3.0);}/*** 格式化时间段** @param millis 毫秒* @return*/public static String formatDuring(long millis) {if (Long.valueOf(0L).equals(millis)) {return "0毫秒";}long days = millis / (1000 * 60 * 60 * 24);long left = millis % (1000 * 60 * 60 * 24);long hours = left / (1000 * 60 * 60);left = left % (1000 * 60 * 60);long minutes = left / (1000 * 60);left = left % (1000 * 60);long seconds = left / 1000;left = left % 1000;String s = days > 0 ? (days + "天") : ("");s += hours > 0 ? (hours + "小时") : ("");s += minutes > 0 ? (minutes + "分钟") : ("");s += seconds > 0 ? (seconds + "秒") : ("");s += left > 0 ? (left + "毫秒") : ("");return s;}// 节假日// https://timor.tech/api/holiday/@Testpublic void parseTest() {System.err.println(parseLocalDateTime("2020-01-01 10:10:10.100", yyyy_MM_dd_HH_mm_ss_SSS));System.err.println(parseLocalDateTime("2020-01-01 10:10:10", yyyy_MM_dd_HH_mm_ss));System.err.println(parseLocalDate("2020-01-01", yyyy_MM_dd));System.err.println(parseLocalTime("10:10:10", HH_mm_ss));}@Testpublic void formatTest() {System.err.println(formatLocalDateTime(LocalDateTime.now(), yyyy_MM_dd_HH_mm_ss_SSS));System.err.println(formatLocalDateTime(LocalDateTime.now(), yyyy_MM_dd_HH_mm_ss));System.err.println(formatLocalDate(LocalDate.now(), yyyy_MM_dd));System.err.println(formatLocalTime(LocalTime.now(), HH_mm_ss));}@Testpublic void betweenTest() {System.out.println(betweenDays(LocalDate.of(2020, 6, 1), LocalDate.of(2020, 7, 1)));System.out.println(betweenHours(LocalDateTime.now(), LocalDateTime.now().plusHours(100)));System.out.println(betweenMinutes(LocalDateTime.now(), LocalDateTime.now().plusMinutes(100)));System.out.println(betweenMillis(LocalDateTime.now(), LocalDateTime.now().plusHours(100)));}@Testpublic void convertTest() {System.err.println(localDate2Date(LocalDate.now()));System.err.println(localDateTime2Date(LocalDateTime.now()));System.err.println(date2LocalDate(new Date()));System.err.println(date2LocalDateTime(new Date()));}@Testpublic void millisTest() {System.out.println(timeMillis2LocalDate(System.currentTimeMillis()));System.out.println(timeMillis2LocalTime(System.currentTimeMillis()));System.out.println(timeMillis2LocalDateTime(System.currentTimeMillis()));System.err.println(localDate2timeMillis(LocalDate.now()));System.err.println(localTime2timeMillis(LocalTime.now()));System.err.println(localDateTime2timeMillis(LocalDateTime.now()));}@Testpublic void getMondayByWeekOfYearTest() {LocalDate secondWeekOf2024 = getMondayByWeekOfYear(2024, 2);LocalDate firstWeekOf2025 = getMondayByWeekOfYear(2025, 1);LocalDate firstWeekOf2027 = getMondayByWeekOfYear(2027, 1);System.err.println(secondWeekOf2024);System.err.println(firstWeekOf2025);System.err.println(firstWeekOf2027);}@Testpublic void getWeekBasedYearTest() {int year = getWeekBasedYear(LocalDate.of(2024, 12, 30));System.err.println(year);}@Testpublic void getDatesBetween2DatesTest() {List<LocalDate> dates = getDatesBetween2Dates(LocalDate.of(2025, 1, 1), LocalDate.of(2025, 2, 15));System.err.println(dates);}@Testpublic void getDatesBetween2DatesV2Test() {List<LocalDate> dates = getDatesBetween2DatesV2(LocalDate.of(2025, 1, 1), LocalDate.of(2025, 2, 15));System.err.println(dates);}/*** 补充:** mysql数据类型 - java数据类型* time - LocalTime/java.sql.Time* date - LocalDate/java.sql.Date* datetime - LocalDateTime/java.util.Date** java8 日期类 和 mysql 的字段类型映射,需满足: mysql 驱动包版本不低于 4.2* <dependency>* <groupId>mysql</groupId>* <artifactId>mysql-connector-java</artifactId>* <version>5.1.37</version>* </dependency>** 如果使用 mybatis,则还需添加依赖(mybatis-plus 较新版本已经做了支持,不需要该依赖)* <dependency>* <groupId>org.mybatis</groupId>* <artifactId>mybatis-typehandlers-jsr310</artifactId>* <version>1.0.1</version>* </dependency>**/}
