这个的通用方法相当简单:

public static String convertSecondsToHMmSs(long seconds) {
    long s = seconds % 60;
    long m = (seconds / 60) % 60;
    long h = (seconds / (60 * 60)) % 24;
    return String.format("%d:%02d:%02d", h,m,s);
}

这个的通用方法相当简单:

public static String convertSecondsToHMmSs(long seconds) {
    long s = seconds % 60;
    long m = (seconds / 60) % 60;
    long h = (seconds / (60 * 60)) % 24;
    return String.format("%d:%02d:%02d", h,m,s);
}

你真的很接近:

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)));   

你用分钟而不是小时将小时转换为毫秒。

顺便说一句，我喜欢你使用TimeUnit API:)

下面是一些测试代码:

public static void main(String[] args) throws ParseException {
    long millis = 3600000;
    String hms = 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)));
    System.out.println(hms);
}

输出:

01:00:00

我意识到我上面的代码可以通过使用模除法而不是减法来大大简化:

String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
    TimeUnit.MILLISECONDS.toMinutes(millis) % TimeUnit.HOURS.toMinutes(1),
    TimeUnit.MILLISECONDS.toSeconds(millis) % TimeUnit.MINUTES.toSeconds(1));

仍然使用TimeUnit API为所有魔术值，并给出完全相同的输出。

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(); }

 public String millsToDateFormat(long mills) {

    Date date = new Date(mills);
    DateFormat formatter = new SimpleDateFormat("HH:mm:ss");
    String dateFormatted = formatter.format(date);
    return dateFormatted; //note that it will give you the time in GMT+0
}

DateFormat df = new SimpleDateFormat("HH:mm:ss");
String formatted = df.format(aDateObject);