我希望使用简单的Java在两个日期之间获取日期名称,而不使用任何第三方库。
我希望得到周六,周日,周一等两天的名字。
答案 0 :(得分:2)
/**
*
* @param startDate
* @param endDate
* @return Start Date and End Date are <b>Inclusive</b>, days returned between these two dates
*/
protected List<String> getWeekDayNames(Date startDate, Date endDate) {
List<String> days = new ArrayList<String>();
Calendar startCal = Calendar.getInstance();
startCal.setTime(startDate);
Calendar endCal = Calendar.getInstance();
endCal.setTime(endDate);
if (startCal.getTimeInMillis() == endCal.getTimeInMillis()) {
days.add(this.formatDayOfWeek(startCal.getTime()));
return Collections.unmodifiableList(days);
}
// swap values
if (startCal.getTimeInMillis() > endCal.getTimeInMillis()) {
startCal.setTime(endDate);
endCal.setTime(startDate);
}
do {
days.add(this.formatDayOfWeek(startCal.getTime()));
startCal.add(Calendar.DAY_OF_MONTH, 1);
} while (startCal.getTimeInMillis() <= endCal.getTimeInMillis());
return Collections.unmodifiableList(days);
}
<强>用法:强>
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, 15);
List<String> list = new Test().getWeekDayNames(new Date(), cal.getTime());
System.out.println(list);
<强>输出:强>
[SATURDAY, SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY]
答案 1 :(得分:1)
通常我会建议使用Joda-Time库,这是臭名昭着的java.util.Date&amp; amp;与Java捆绑在一起的java.util.Calendar类。但该课题不需要第三方图书馆。
因此,我的代码示例不是使用Joda-Time,而是使用与java.time.* package捆绑在一起的新Java 8。这些课程的灵感来自Joda-Time,但完全是重新设计的。它们由JSR 310定义。有关更多信息,请参阅Oracle的new Tutorial。
解决方案非常简单。归结为这个单行片段......
DayOfWeek.from( zonedDateTime ).getDisplayName( TextStyle.FULL, Locale.US );
为了好玩,我抛出一条额外的线条来展示本地化是多么容易。在这种情况下,我会显示法语以及美国英语单词的星期几。
以下是整个代码段,如果您导入java.time.*
和java.time.format.*
,则可以投放。
ZoneId timeZone = ZoneId.of( "America/New_York" );
ZonedDateTime start = ZonedDateTime.now( timeZone );
ZonedDateTime stop = start.plusDays( 2 );
// Usually spans of time are handled in a "half-open" manner, meaning start is inclusive and stop is exclusive.
// But the Question required both start and stop to be inclusive. So add "1".
long days = java.time.temporal.ChronoUnit.DAYS.between( start, stop ) + 1L;
System.out.println( days + " days from " + start + " to " + stop + " inclusive…");
for ( int i = 0; i < days; i++ ) {
ZonedDateTime zonedDateTime = start.plusDays( i );
String dayOfWeek = DayOfWeek.from( zonedDateTime ).getDisplayName( TextStyle.FULL, java.util.Locale.US );
String dayOfWeek_Français = DayOfWeek.from( zonedDateTime ).getDisplayName( TextStyle.FULL, java.util.Locale.FRENCH );
System.out.println( "zonedDateTime: " + zonedDateTime + " dayOfWeek: " + dayOfWeek + " dayOfWeek_Français: " + dayOfWeek_Français );
}
跑步时......
3 days from 2014-02-08T06:06:33.335-05:00[America/New_York] to 2014-02-10T06:06:33.335-05:00[America/New_York] inclusive…
zonedDateTime: 2014-02-08T06:06:33.335-05:00[America/New_York] dayOfWeek: Saturday dayOfWeek_Français: samedi
zonedDateTime: 2014-02-09T06:06:33.335-05:00[America/New_York] dayOfWeek: Sunday dayOfWeek_Français: dimanche
zonedDateTime: 2014-02-10T06:06:33.335-05:00[America/New_York] dayOfWeek: Monday dayOfWeek_Français: lundi