需要的包：

import java.time.DayOfWeek; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoUnit; import java.time.temporal.TemporalAccessor; import java.time.temporal.TemporalAdjusters; import java.util.ArrayList; import java.util.List;

直接上包：測試效果在后面。

package com.item.common;import java.time.DayOfWeek; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoUnit; import java.time.temporal.TemporalAccessor; import java.time.temporal.TemporalAdjusters; import java.util.ArrayList; import java.util.List;/*** Java8日期時間工具類** @author TeacherFu* @date 2021年3月2日02:27:12*/ public class LocalDateUtils {/*** 顯示年月日時分秒，例如 2000-01-01 00:00:01.*/public static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";/*** 僅顯示年月日，例如 2000-01-01.*/public static final String DATE_PATTERN = "yyyy-MM-dd";/*** 僅顯示時分秒，例如 00:00:01.*/public static final String TIME_PATTERN = "HH:mm:ss";/*** 顯示年月日時分秒(無符號)，例如 20200101000001.*/public static final String UNSIGNED_DATETIME_PATTERN = "yyyyMMddHHmmss";/*** 僅顯示年月日(無符號)，例如 20000101.*/public static final String UNSIGNED_DATE_PATTERN = "yyyyMMdd";/*** 春天;*/public static final Integer SPRING = 1;/*** 夏天;*/public static final Integer SUMMER = 2;/*** 秋天;*/public static final Integer AUTUMN = 3;/*** 冬天;*/public static final Integer WINTER = 4;/*** 星期日;*/public static final String SUNDAY = "星期日";/*** 星期一;*/public static final String MONDAY = "星期一";/*** 星期二;*/public static final String TUESDAY = "星期二";/*** 星期三;*/public static final String WEDNESDAY = "星期三";/*** 星期四;*/public static final String THURSDAY = "星期四";/*** 星期五;*/public static final String FRIDAY = "星期五";/*** 星期六;*/public static final String SATURDAY = "星期六";/*** 年*/private static final String YEAR = "year";/*** 月*/private static final String MONTH = "month";/*** 周*/private static final String WEEK = "week";/*** 日*/private static final String DAY = "day";/*** 時*/private static final String HOUR = "hour";/*** 分*/private static final String MINUTE = "minute";/*** 秒*/private static final String SECOND = "second";/*** 獲取當前日期和時間字符串.** @return String 日期時間字符串，例如 2000-01-01 00:00:01*/public static String getLocalDateTimeStr() {return format(LocalDateTime.now(), DATETIME_PATTERN);}/*** 獲取當前日期字符串.** @return String 日期字符串，例如2000-01-01*/public static String getLocalDateStr() {return format(LocalDate.now(), DATE_PATTERN);}/*** 獲取當前時間字符串.** @return String 時間字符串，例如 00:00:01*/public static String getLocalTimeStr() {return format(LocalTime.now(), TIME_PATTERN);}/*** 獲取當前星期字符串.** @return String 當前星期字符串，例如 星期二*/public static String getDayOfWeekStr() {return format(LocalDate.now(), "E");}/*** 獲取指定日期是星期幾** @param localDate 日期* @return String 星期幾*/public static String getDayOfWeekStr(LocalDate localDate) {String[] weekOfDays = {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY};int dayOfWeek = localDate.getDayOfWeek().getValue() - 1;return weekOfDays[dayOfWeek];}/*** 獲取日期時間字符串** @param temporal 需要轉化的日期時間* @param pattern 時間格式* @return String 日期時間字符串，例如 2000-01-01 00:00:01*/public static String format(TemporalAccessor temporal, String pattern) {DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);return dateTimeFormatter.format(temporal);}/*** 日期時間字符串轉換為日期時間(java.time.LocalDateTime)** @param localDateTimeStr 日期時間字符串* @param pattern 日期時間格式 例如DATETIME_PATTERN* @return LocalDateTime 日期時間*/public static LocalDateTime parseLocalDateTime(String localDateTimeStr, String pattern) {DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);return LocalDateTime.parse(localDateTimeStr, dateTimeFormatter);}/*** 日期字符串轉換為日期(java.time.LocalDate)** @param localDateStr 日期字符串* @param pattern 日期格式 例如DATE_PATTERN* @return LocalDate 日期*/public static LocalDate parseLocalDate(String localDateStr, String pattern) {DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);return LocalDate.parse(localDateStr, dateTimeFormatter);}/*** 獲取指定日期時間加上指定數量日期時間單位之后的日期時間.** @param localDateTime 日期時間* @param num 數量* @param chronoUnit 日期時間單位* @return LocalDateTime 新的日期時間*/public static LocalDateTime plus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {return localDateTime.plus(num, chronoUnit);}/*** 獲取指定日期時間減去指定數量日期時間單位之后的日期時間.** @param localDateTime 日期時間* @param num 數量* @param chronoUnit 日期時間單位* @return LocalDateTime 新的日期時間*/public static LocalDateTime minus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {return localDateTime.minus(num, chronoUnit);}/*** 根據ChronoUnit計算兩個日期時間之間相隔日期時間** @param start 開始日期時間* @param end 結束日期時間* @param chronoUnit 日期時間單位* @return long 相隔日期時間*/public static long getChronoUnitBetween(LocalDateTime start, LocalDateTime end, ChronoUnit chronoUnit) {return Math.abs(start.until(end, chronoUnit));}/*** 根據ChronoUnit計算兩個日期之間相隔年數或月數或天數** @param start 開始日期* @param end 結束日期* @param chronoUnit 日期時間單位,(ChronoUnit.YEARS,ChronoUnit.MONTHS,ChronoUnit.WEEKS,ChronoUnit.DAYS)* @return long 相隔年數或月數或天數*/public static long getChronoUnitBetween(LocalDate start, LocalDate end, ChronoUnit chronoUnit) {return Math.abs(start.until(end, chronoUnit));}/*** 獲取本年第一天的日期字符串** @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfYearStr() {return getFirstDayOfYearStr(LocalDateTime.now());}/*** 獲取本年最后一天的日期字符串** @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfYearStr() {return getLastDayOfYearStr(LocalDateTime.now());}/*** 獲取指定日期當年第一天的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfYearStr(LocalDateTime localDateTime) {return getFirstDayOfYearStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當年最后一天的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfYearStr(LocalDateTime localDateTime) {return getLastDayOfYearStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當年第一天的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfYearStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.withDayOfYear(1).withHour(0).withMinute(0).withSecond(0), pattern);}/*** 獲取指定日期當年最后一天的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfYearStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.with(TemporalAdjusters.lastDayOfYear()).withHour(23).withMinute(59).withSecond(59), pattern);}/*** 獲取本月第一天的日期字符串** @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfMonthStr() {return getFirstDayOfMonthStr(LocalDateTime.now());}/*** 獲取本月最后一天的日期字符串** @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfMonthStr() {return getLastDayOfMonthStr(LocalDateTime.now());}/*** 獲取指定日期當月第一天的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getFirstDayOfMonthStr(LocalDateTime localDateTime) {return getFirstDayOfMonthStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當月最后一天的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfMonthStr(LocalDateTime localDateTime) {return getLastDayOfMonthStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當月第一天的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfMonthStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.withDayOfMonth(1).withHour(0).withMinute(0).withSecond(0), pattern);}/*** 獲取指定日期當月最后一天的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfMonthStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.with(TemporalAdjusters.lastDayOfMonth()).withHour(23).withMinute(59).withSecond(59), pattern);}/*** 獲取本周第一天的日期字符串** @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfWeekStr() {return getFirstDayOfWeekStr(LocalDateTime.now());}/*** 獲取本周最后一天的日期字符串** @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfWeekStr() {return getLastDayOfWeekStr(LocalDateTime.now());}/*** 獲取指定日期當周第一天的日期字符串,這里第一天為周一** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfWeekStr(LocalDateTime localDateTime) {return getFirstDayOfWeekStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當周最后一天的日期字符串,這里最后一天為周日** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfWeekStr(LocalDateTime localDateTime) {return getLastDayOfWeekStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期當周第一天的日期字符串,這里第一天為周一,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getFirstDayOfWeekStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.with(DayOfWeek.MONDAY).withHour(0).withMinute(0).withSecond(0), pattern);}/*** 獲取指定日期當周最后一天的日期字符串,這里最后一天為周日,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getLastDayOfWeekStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.with(DayOfWeek.SUNDAY).withHour(23).withMinute(59).withSecond(59), pattern);}/*** 獲取今天開始時間的日期字符串** @return String 格式：yyyy-MM-dd 00:00:00*/public static String getStartTimeOfDayStr() {return getStartTimeOfDayStr(LocalDateTime.now());}/*** 獲取今天結束時間的日期字符串** @return String 格式：yyyy-MM-dd 23:59:59*/public static String getEndTimeOfDayStr() {return getEndTimeOfDayStr(LocalDateTime.now());}/*** 獲取指定日期開始時間的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 00:00:00*/public static String getStartTimeOfDayStr(LocalDateTime localDateTime) {return getStartTimeOfDayStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期結束時間的日期字符串** @param localDateTime 指定日期時間* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getEndTimeOfDayStr(LocalDateTime localDateTime) {return getEndTimeOfDayStr(localDateTime, DATETIME_PATTERN);}/*** 獲取指定日期開始時間的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd HH:mm:ss*/public static String getStartTimeOfDayStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.withHour(0).withMinute(0).withSecond(0), pattern);}/*** 獲取指定日期結束時間的日期字符串,帶日期格式化參數** @param localDateTime 指定日期時間* @param pattern 日期時間格式* @return String 格式：yyyy-MM-dd 23:59:59*/public static String getEndTimeOfDayStr(LocalDateTime localDateTime, String pattern) {return format(localDateTime.withHour(23).withMinute(59).withSecond(59), pattern);}/*** 切割日期。按照周期切割成小段日期段。例如： <br>** @param startDate 開始日期（yyyy-MM-dd）* @param endDate 結束日期（yyyy-MM-dd）* @param period 周期（天，周，月，年）* @return 切割之后的日期集合*/public static List<String> listDateStrs(String startDate, String endDate, String period) {List<String> result = new ArrayList<>();DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(DATE_PATTERN);LocalDate end = LocalDate.parse(endDate, dateTimeFormatter);LocalDate start = LocalDate.parse(startDate, dateTimeFormatter);LocalDate tmp = start;switch (period) {case DAY:while (start.isBefore(end) || start.isEqual(end)) {result.add(start.toString());start = start.plusDays(1);}break;case WEEK:while (tmp.isBefore(end) || tmp.isEqual(end)) {if (tmp.plusDays(6).isAfter(end)) {result.add(tmp.toString() + "," + end);} else {result.add(tmp.toString() + "," + tmp.plusDays(6));}tmp = tmp.plusDays(7);}break;case MONTH:while (tmp.isBefore(end) || tmp.isEqual(end)) {LocalDate lastDayOfMonth = tmp.with(TemporalAdjusters.lastDayOfMonth());if (lastDayOfMonth.isAfter(end)) {result.add(tmp.toString() + "," + end);} else {result.add(tmp.toString() + "," + lastDayOfMonth);}tmp = lastDayOfMonth.plusDays(1);}break;case YEAR:while (tmp.isBefore(end) || tmp.isEqual(end)) {LocalDate lastDayOfYear = tmp.with(TemporalAdjusters.lastDayOfYear());if (lastDayOfYear.isAfter(end)) {result.add(tmp.toString() + "," + end);} else {result.add(tmp.toString() + "," + lastDayOfYear);}tmp = lastDayOfYear.plusDays(1);}break;default:break;}return result;}public static void main(String[] args) {System.out.println(getLocalDateTimeStr());System.out.println(getLocalDateStr());System.out.println(getLocalTimeStr());System.out.println(getDayOfWeekStr());System.out.println(getDayOfWeekStr(LocalDate.now()));System.out.println("========");System.out.println(format(LocalDate.now(), UNSIGNED_DATE_PATTERN));System.out.println("========");System.out.println(parseLocalDateTime("2020-12-10 10:10:12", DATETIME_PATTERN));System.out.println(parseLocalDate("2020-12-13", DATE_PATTERN));System.out.println("========");System.out.println(plus(LocalDateTime.now(), 3, ChronoUnit.HOURS));System.out.println(minus(LocalDateTime.now(), 4, ChronoUnit.DAYS));System.out.println("========");System.out.println(getChronoUnitBetween(LocalDateTime.now(), parseLocalDateTime("2020-12-12 12:00:12", DATETIME_PATTERN), ChronoUnit.MINUTES));System.out.println(getChronoUnitBetween(LocalDate.now(), parseLocalDate("2021-12-12", DATE_PATTERN), ChronoUnit.WEEKS));System.out.println("========");System.out.println(getFirstDayOfYearStr());System.out.println(getFirstDayOfYearStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getFirstDayOfYearStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println(getLastDayOfYearStr());System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println("========");System.out.println(getFirstDayOfMonthStr());System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println(getLastDayOfMonthStr());System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println("========");System.out.println(getFirstDayOfWeekStr());System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println(getLastDayOfWeekStr());System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println("========");System.out.println(getStartTimeOfDayStr());System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println(getEndTimeOfDayStr());System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN)));System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:00:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));System.out.println("========");List<String> dateStrs = listDateStrs("2000-01-01", "2021-03-02", YEAR);for (String dateStr : dateStrs) {System.out.println(dateStr);}System.out.println("========");List<String> dateStrs1 = listDateStrs("2021-01-01", "2021-03-02", MONTH);for (String dateStr : dateStrs1) {System.out.println(dateStr);}System.out.println("========");List<String> dateStrs2 = listDateStrs("2021-01-01", "2021-03-02", DAY);for (String dateStr : dateStrs2) {System.out.println(dateStr);}}}

測試效果如下：

總結

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