歴史上最も完全なJava 8日付ツール類（共有）
これは私がまとめたJava 8日用品の種類です。比較的に全面的で、日常開発の大部分の需要を満たして、皆さんに分かち合います。
/**
* Java8
*
* @author JourWon
* @date 2020/12/13
*/
public class LocalDateUtils {
/**
* ， 2015-08-11 09:51:53.
*/
public static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
/**
* ， 2015-08-11.
*/
public static final String DATE_PATTERN = "yyyy-MM-dd";
/**
* ， 09:51:53.
*/
public static final String TIME_PATTERN = "HH:mm:ss";
/**
* ( )， 20150811095153.
*/
public static final String UNSIGNED_DATETIME_PATTERN = "yyyyMMddHHmmss";
/**
* ( )， 20150811.
*/
public static final String UNSIGNED_DATE_PATTERN = "yyyyMMdd";
/**
* ;
*/
public static final Integer SPRING = 1;
/**
* ;
*/
public static final Integer SUMMER = 2;
/**
* ;
*/
public static final Integer AUTUMN = 3;
/**
* ;
*/
public static final Integer WINTER = 4;
/**
* ;
*/
public static final String SUNDAY = " ";
/**
* ;
*/
public static final String MONDAY = " ";
/**
* ;
*/
public static final String TUESDAY = " ";
/**
* ;
*/
public static final String WEDNESDAY = " ";
/**
* ;
*/
public static final String THURSDAY = " ";
/**
* ;
*/
public static final String FRIDAY = " ";
/**
* ;
*/
public static final String SATURDAY = " ";
/**
*
*/
private static final String YEAR = "year";
/**
*
*/
private static final String MONTH = "month";
/**
*
*/
private static final String WEEK = "week";
/**
*
*/
private static final String DAY = "day";
/**
*
*/
private static final String HOUR = "hour";
/**
*
*/
private static final String MINUTE = "minute";
/**
*
*/
private static final String SECOND = "second";
/**
* .
*
* @return String ， 2015-08-11 09:51:53
*/
public static String getLocalDateTimeStr() {
return format(LocalDateTime.now(), DATETIME_PATTERN);
}
/**
* .
*
* @return String ， 2015-08-11
*/
public static String getLocalDateStr() {
return format(LocalDate.now(), DATE_PATTERN);
}
/**
* .
*
* @return String ， 09:51:53
*/
public static String getLocalTimeStr() {
return format(LocalTime.now(), TIME_PATTERN);
}
/**
* .
*
* @return String ，
*/
public static String getDayOfWeekStr() {
return format(LocalDate.now(), "E");
}
/**
*
*
* @param localDate
* @return String
*/
public static String getDayOfWeekStr(LocalDate localDate) {
String[] weekOfDays = {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY};
int dayOfWeek = localDate.getDayOfWeek().getValue() - 1;
return weekOfDays[dayOfWeek];
}
/**
*
*
* @param temporal
* @param pattern
* @return String ， 2015-08-11 09:51:53
*/
public static String format(TemporalAccessor temporal, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return dateTimeFormatter.format(temporal);
}
/**
* (java.time.LocalDateTime)
*
* @param localDateTimeStr
* @param pattern DATETIME_PATTERN
* @return LocalDateTime
*/
public static LocalDateTime parseLocalDateTime(String localDateTimeStr, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return LocalDateTime.parse(localDateTimeStr, dateTimeFormatter);
}
/**
* (java.time.LocalDate)
*
* @param localDateStr
* @param pattern DATE_PATTERN
* @return LocalDate
*/
public static LocalDate parseLocalDate(String localDateStr, String pattern) {
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
return LocalDate.parse(localDateStr, dateTimeFormatter);
}
/**
* .
*
* @param localDateTime
* @param num
* @param chronoUnit
* @return LocalDateTime
*/
public static LocalDateTime plus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {
return localDateTime.plus(num, chronoUnit);
}
/**
* .
*
* @param localDateTime
* @param num
* @param chronoUnit
* @return LocalDateTime
*/
public static LocalDateTime minus(LocalDateTime localDateTime, int num, ChronoUnit chronoUnit) {
return localDateTime.minus(num, chronoUnit);
}
/**
* ChronoUnit
*
* @param start
* @param end
* @param chronoUnit
* @return long
*/
public static long getChronoUnitBetween(LocalDateTime start, LocalDateTime end, ChronoUnit chronoUnit) {
return Math.abs(start.until(end, chronoUnit));
}
/**
* ChronoUnit
*
* @param start
* @param end
* @param chronoUnit ,(ChronoUnit.YEARS,ChronoUnit.MONTHS,ChronoUnit.WEEKS,ChronoUnit.DAYS)
* @return long
*/
public static long getChronoUnitBetween(LocalDate start, LocalDate end, ChronoUnit chronoUnit) {
return Math.abs(start.until(end, chronoUnit));
}
/**
*
*
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getFirstDayOfYearStr() {
return getFirstDayOfYearStr(LocalDateTime.now());
}
/**
*
*
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfYearStr() {
return getLastDayOfYearStr(LocalDateTime.now());
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getFirstDayOfYearStr(LocalDateTime localDateTime) {
return getFirstDayOfYearStr(localDateTime, DATETIME_PATTERN);
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfYearStr(LocalDateTime localDateTime) {
return getLastDayOfYearStr(localDateTime, DATETIME_PATTERN);
}
/**
* ,
*
* @param localDateTime
* @param pattern
* @return String ：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);
}
/**
* ,
*
* @param localDateTime
* @param pattern
* @return String ：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);
}
/**
*
*
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getFirstDayOfMonthStr() {
return getFirstDayOfMonthStr(LocalDateTime.now());
}
/**
*
*
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfMonthStr() {
return getLastDayOfMonthStr(LocalDateTime.now());
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getFirstDayOfMonthStr(LocalDateTime localDateTime) {
return getFirstDayOfMonthStr(localDateTime, DATETIME_PATTERN);
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfMonthStr(LocalDateTime localDateTime) {
return getLastDayOfMonthStr(localDateTime, DATETIME_PATTERN);
}
/**
* ,
*
* @param localDateTime
* @return String ：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);
}
/**
* ,
*
* @param localDateTime
* @param pattern
* @return String ：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);
}
/**
*
*
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getFirstDayOfWeekStr() {
return getFirstDayOfWeekStr(LocalDateTime.now());
}
/**
*
*
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfWeekStr() {
return getLastDayOfWeekStr(LocalDateTime.now());
}
/**
* ,
*
* @param localDateTime
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getFirstDayOfWeekStr(LocalDateTime localDateTime) {
return getFirstDayOfWeekStr(localDateTime, DATETIME_PATTERN);
}
/**
* ,
*
* @param localDateTime
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getLastDayOfWeekStr(LocalDateTime localDateTime) {
return getLastDayOfWeekStr(localDateTime, DATETIME_PATTERN);
}
/**
* , ,
*
* @param localDateTime
* @param pattern
* @return String ：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);
}
/**
* , ,
*
* @param localDateTime
* @param pattern
* @return String ：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);
}
/**
*
*
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getStartTimeOfDayStr() {
return getStartTimeOfDayStr(LocalDateTime.now());
}
/**
*
*
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getEndTimeOfDayStr() {
return getEndTimeOfDayStr(LocalDateTime.now());
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 00:00:00
*/
public static String getStartTimeOfDayStr(LocalDateTime localDateTime) {
return getStartTimeOfDayStr(localDateTime, DATETIME_PATTERN);
}
/**
*
*
* @param localDateTime
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getEndTimeOfDayStr(LocalDateTime localDateTime) {
return getEndTimeOfDayStr(localDateTime, DATETIME_PATTERN);
}
/**
* ,
*
* @param localDateTime
* @param pattern
* @return String ：yyyy-MM-dd HH:mm:ss
*/
public static String getStartTimeOfDayStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withHour(0).withMinute(0).withSecond(0), pattern);
}
/**
* ,
*
* @param localDateTime
* @param pattern
* @return String ：yyyy-MM-dd 23:59:59
*/
public static String getEndTimeOfDayStr(LocalDateTime localDateTime, String pattern) {
return format(localDateTime.withHour(23).withMinute(59).withSecond(59), pattern);
}
/**
* 。 。 ： <br>
*
* @param startDate （yyyy-MM-dd）
* @param endDate （yyyy-MM-dd）
* @param period （ ， ， ， ）
* @return
* <li>startDate="2019-02-28",endDate="2019-03-05",period="day"</li>
* <li> ：[2019-02-28, 2019-03-01, 2019-03-02, 2019-03-03, 2019-03-04, 2019-03-05]</li><br>
* <li>startDate="2019-02-28",endDate="2019-03-25",period="week"</li>
* <li> ：[2019-02-28,2019-03-06, 2019-03-07,2019-03-13, 2019-03-14,2019-03-20,
* 2019-03-21,2019-03-25]</li><br>
* <li>startDate="2019-02-28",endDate="2019-05-25",period="month"</li>
* <li> ：[2019-02-28,2019-02-28, 2019-03-01,2019-03-31, 2019-04-01,2019-04-30,
* 2019-05-01,2019-05-25]</li><br>
* <li>startDate="2019-02-28",endDate="2020-05-25",period="year"</li>
* <li> ：[2019-02-28,2019-12-31, 2020-01-01,2020-05-25]</li><br>
*/
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("2020-12-13 11:14:12", 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 12:03:12", 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 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfYearStr());
System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfYearStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getFirstDayOfMonthStr());
System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfMonthStr());
System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfMonthStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getFirstDayOfWeekStr());
System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getFirstDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getLastDayOfWeekStr());
System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getLastDayOfWeekStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
System.out.println(getStartTimeOfDayStr());
System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getStartTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println(getEndTimeOfDayStr());
System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN)));
System.out.println(getEndTimeOfDayStr(parseLocalDateTime("2021-12-12 12:03:12", DATETIME_PATTERN), UNSIGNED_DATETIME_PATTERN));
System.out.println("========");
List<String> dateStrs = listDateStrs("2019-01-30", "2020-12-13", YEAR);
for (String dateStr : dateStrs) {
System.out.println(dateStr);
}
System.out.println("========");
List<String> dateStrs1 = listDateStrs("2019-01-30", "2020-12-13", MONTH);
for (String dateStr : dateStrs1) {
System.out.println(dateStr);
}
System.out.println("========");
List<String> dateStrs2 = listDateStrs("2020-12-01", "2020-12-13", DAY);
for (String dateStr : dateStrs2) {
System.out.println(dateStr);
}
}
}