我想用H:MM:SS这样的模式以秒为单位格式化持续时间。java中当前的实用程序设计用于格式化时间，而不是持续时间。
当前回答
在java8中还有另一种方法。但如果持续时间不超过24小时，则有效
public String formatDuration(Duration duration) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("h:mm.SSS");
return LocalTime.ofNanoOfDay(duration.toNanos()).format(formatter);
}
其他回答
这个答案只使用Duration方法，适用于Java 8:
public static String format(Duration d) {
long days = d.toDays();
d = d.minusDays(days);
long hours = d.toHours();
d = d.minusHours(hours);
long minutes = d.toMinutes();
d = d.minusMinutes(minutes);
long seconds = d.getSeconds() ;
return
(days == 0?"":days+" days,")+
(hours == 0?"":hours+" hours,")+
(minutes == 0?"":minutes+" minutes,")+
(seconds == 0?"":seconds+" seconds,");
}
long duration = 4 * 60 * 60 * 1000;
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS", Locale.getDefault());
log.info("Duration: " + sdf.format(new Date(duration - TimeZone.getDefault().getRawOffset())));
在java8中还有另一种方法。但如果持续时间不超过24小时，则有效
public String formatDuration(Duration duration) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("h:mm.SSS");
return LocalTime.ofNanoOfDay(duration.toNanos()).format(formatter);
}
我的库Time4J提供了一个基于模式的解决方案(类似于Apache DurationFormatUtils，但更灵活):
Duration<ClockUnit> duration =
Duration.of(-573421, ClockUnit.SECONDS) // input in seconds only
.with(Duration.STD_CLOCK_PERIOD); // performs normalization to h:mm:ss-structure
String fs = Duration.formatter(ClockUnit.class, "+##h:mm:ss").format(duration);
System.out.println(fs); // output => -159:17:01
这段代码演示了处理小时溢出和符号处理的功能，请参见基于模式的持续时间格式化程序的API。
这是一个可行的选择。
public static String showDuration(LocalTime otherTime){
DateTimeFormatter df = DateTimeFormatter.ISO_LOCAL_TIME;
LocalTime now = LocalTime.now();
System.out.println("now: " + now);
System.out.println("otherTime: " + otherTime);
System.out.println("otherTime: " + otherTime.format(df));
Duration span = Duration.between(otherTime, now);
LocalTime fTime = LocalTime.ofNanoOfDay(span.toNanos());
String output = fTime.format(df);
System.out.println(output);
return output;
}
使用
System.out.println(showDuration(LocalTime.of(9, 30, 0, 0)));
产生如下内容:
otherTime: 09:30
otherTime: 09:30:00
11:31:27.463
11:31:27.463
