我尝试了第一个答案。它起作用了，但是负号让我很困惑。Groovy的回答是:

import static java.util.concurrent.TimeUnit.*

...

private static String formatElapsedTime(long millis) {

    int hrs = MILLISECONDS.toHours(millis) % 24
    int min = MILLISECONDS.toMinutes(millis) % 60
    int sec = MILLISECONDS.toSeconds(millis) % 60
    int mls = millis % 1000

    sprintf( '%02d:%02d:%02d (%03d)', [hrs, min, sec, mls])
}

Kotlin的

val hours = String.format("%02d", TimeUnit.MILLISECONDS.toHours(milSecs))
val minutes = String.format("%02d",
                        TimeUnit.MILLISECONDS.toMinutes(milSecs) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(milSecs)))
val seconds = String.format("%02d",
                        TimeUnit.MILLISECONDS.toSeconds(milSecs) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(milSecs)))

其中，milSecs是毫秒

4个实现的测试结果

必须为巨大的数据做大量的格式化，需要最好的性能，所以下面是(令人惊讶的)结果:

For (int I = 0;I < 1000000;我+ +){ FUNCTION_CALL ｝

持续时间:

combinationFormatter: 196 millis formatDuration: 272 millis apacheFormat: 754 millis formatTimeUnit: 2216 millis public static String apacheFormat(long millis) throws ParseException { return DurationFormatUtils.formatDuration(millis, "HH:mm:ss"); } public static String formatTimeUnit(long millis) throws ParseException { String formatted = String.format( "%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis), TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)), TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))); return formatted; } public static String formatDuration(final long millis) { long seconds = (millis / 1000) % 60; long minutes = (millis / (1000 * 60)) % 60; long hours = millis / (1000 * 60 * 60); StringBuilder b = new StringBuilder(); b.append(hours == 0 ? "00" : hours < 10 ? String.valueOf("0" + hours) : String.valueOf(hours)); b.append(":"); b.append(minutes == 0 ? "00" : minutes < 10 ? String.valueOf("0" + minutes) : String.valueOf(minutes)); b.append(":"); b.append(seconds == 0 ? "00" : seconds < 10 ? String.valueOf("0" + seconds) : String.valueOf(seconds)); return b.toString(); } public static String combinationFormatter(final long millis) { long seconds = TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)); long minutes = TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)); long hours = TimeUnit.MILLISECONDS.toHours(millis); StringBuilder b = new StringBuilder(); b.append(hours == 0 ? "00" : hours < 10 ? String.valueOf("0" + hours) : String.valueOf(hours)); b.append(":"); b.append(minutes == 0 ? "00" : minutes < 10 ? String.valueOf("0" + minutes) : String.valueOf(minutes)); b.append(":"); b.append(seconds == 0 ? "00" : seconds < 10 ? String.valueOf("0" + seconds) : String.valueOf(seconds)); return b.toString(); }

// New date object from millis
Date date = new Date(millis);
// formattter 
SimpleDateFormat formatter= new SimpleDateFormat("HH:mm:ss.SSS");
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
// Pass date object
String formatted = formatter.format(date );

您还可以使用新的DateTime API

     var formatted = DateTimeFormatter.ofPattern("HH:mm:ss.SSS")
            .withZone(ZoneId.of("UTC"))
            .format(Instant.ofEpochMilli(millis));

标记为正确的答案有一个小错误，

String myTime = String.format("%02d:%02d:%02d",
            TimeUnit.MILLISECONDS.toHours(millis),
            TimeUnit.MILLISECONDS.toMinutes(millis) -
                    TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)), // The change is in this line
            TimeUnit.MILLISECONDS.toSeconds(millis) -
                    TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));

例如，这是我得到的值的一个例子:

417474:44:19

这是得到正确格式的解决方案:

String myTime =  String.format("%02d:%02d:%02d",
                //Hours
                TimeUnit.MILLISECONDS.toHours(millis) -
                        TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(millis)),
                //Minutes
                TimeUnit.MILLISECONDS.toMinutes(millis) -
                        TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
                //Seconds
                TimeUnit.MILLISECONDS.toSeconds(millis) -
                        TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));

得到一个正确的格式:

18:44:19

获取格式hh:mm:ss的其他选项是:

   Date myDate = new Date(timeinMillis);
   SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
   String myTime = formatter.format(myDate);

这对我来说很管用，用kotlin

fun formatToDigitalClock(miliSeconds: Long): String {
        val hours = TimeUnit.MILLISECONDS.toHours(miliSeconds).toInt() % 24
        val minutes = TimeUnit.MILLISECONDS.toMinutes(miliSeconds).toInt() % 60
        val seconds = TimeUnit.MILLISECONDS.toSeconds(miliSeconds).toInt() % 60
        return when {
            hours > 0 -> String.format("%d:%02d:%02d", hours, minutes, seconds)
            minutes > 0 -> String.format("%02d:%02d", minutes, seconds)
            seconds > 0 -> String.format("00:%02d", seconds)
            else -> {
                "00:00"
            }
        }
    }