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);
}

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(); }

Java 9

    Duration timeLeft = Duration.ofMillis(3600000);
    String hhmmss = String.format("%02d:%02d:%02d", 
            timeLeft.toHours(), timeLeft.toMinutesPart(), timeLeft.toSecondsPart());
    System.out.println(hhmmss);

这个打印:

01:00:00

让库方法为您完成相关的转换是正确的。java。time是现代Java日期和时间API，或者更准确地说，它的Duration类比TimeUnit更优雅，更不容易出错。

我使用的toMinutesPart和toSecondsPart方法是在Java 9中引入的。

Java 6、7和8

    long hours = timeLeft.toHours();
    timeLeft = timeLeft.minusHours(hours);
    long minutes = timeLeft.toMinutes();
    timeLeft = timeLeft.minusMinutes(minutes);
    long seconds = timeLeft.toSeconds();
    String hhmmss = String.format("%02d:%02d:%02d", hours, minutes, seconds);
    System.out.println(hhmmss);

输出与上面相同。

问题:这在Java 6和7中如何工作?

在Java 8及以上版本和更新的Android设备上(我被告知从API级别26开始)。时间是与生俱来的。 在Java 6和7中获得ThreeTen Backport，现代类的后端口(JSR 310的ThreeTen;参见底部的链接)。 在(旧的)Android上使用ThreeTen Backport的Android版本。叫做ThreeTenABP。并确保从org.three .bp导入带有子包的日期和时间类。

链接

Oracle教程:Date Time解释如何使用java.time。 Java规范请求(JSR) 310，其中Java。时间是最早被描述的。 ThreeTen Backport项目，java的Backport。timeto Java 6和7 (JSR-310为ThreeTen)。 ThreeTenABP, Android版的ThreeTen Backport 问:如何在Android项目中使用ThreeTenABP，并有一个非常详细的解释。

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

根据波西米亚的答案，我们不需要使用TimeUnit来找到一个已知的值。 更理想的代码

String hms = String.format("%02d:%02d:%02d", millisLeft/(3600*1000),
                    millisLeft/(60*1000) % 60,
                    millisLeft/1000 % 60);

希望能有所帮助

下面的代码以两种方式进行转换

23:59:58:999到86398999

和比

86398999到23:59:58:999

import java.util.concurrent.TimeUnit;

public class TimeUtility {

    public static void main(String[] args) {

        long currentDateTime = System.currentTimeMillis();

        String strTest = "23:59:58:999";
        System.out.println(strTest);

        long l = strToMilli(strTest);
        System.out.println(l);
        l += 1;
        String str = milliToString(l);
        System.out.println(str);
    }

    /**
     * convert a time string into the equivalent long milliseconds
     *
     * @param strTime string fomratted as HH:MM:SS:MSMS i.e. "23:59:59:999"
     * @return long integer like 86399999
     */
    public static long strToMilli(String strTime) {
        long retVal = 0;
        String hour = strTime.substring(0, 2);
        String min = strTime.substring(3, 5);
        String sec = strTime.substring(6, 8);
        String milli = strTime.substring(9, 12);
        int h = Integer.parseInt(hour);
        int m = Integer.parseInt(min);
        int s = Integer.parseInt(sec);
        int ms = Integer.parseInt(milli);

        String strDebug = String.format("%02d:%02d:%02d:%03d", h, m, s, ms);
        //System.out.println(strDebug);
        long lH = h * 60 * 60 * 1000;
        long lM = m * 60 * 1000;
        long lS = s * 1000;

        retVal = lH + lM + lS + ms;
        return retVal;
    }

    /**
     * convert time in milliseconds to the corresponding string, in case of day
     * rollover start from scratch 23:59:59:999 + 1 = 00:00:00:000
     *
     * @param millis the number of milliseconds corresponding to tim i.e.
     *               34137999 that can be obtained as follows;
     *               <p>
     *               long lH = h * 60 * 60 * 1000; //hour to milli
     *               <p>
     *               long lM = m * 60 * 1000; // minute to milli
     *               <p>
     *               long lS = s * 1000; //seconds to milli
     *               <p>
     *               millis = lH + lM + lS + ms;
     * @return a string formatted as HH:MM:SS:MSMS i.e. "23:59:59:999"
     */
    private static String milliToString(long millis) {

        long hrs = TimeUnit.MILLISECONDS.toHours(millis) % 24;
        long min = TimeUnit.MILLISECONDS.toMinutes(millis) % 60;
        long sec = TimeUnit.MILLISECONDS.toSeconds(millis) % 60;
        //millis = millis - (hrs * 60 * 60 * 1000); //alternative way
        //millis = millis - (min * 60 * 1000);
        //millis = millis - (sec * 1000);
        //long mls = millis ;
        long mls = millis % 1000;
        String toRet = String.format("%02d:%02d:%02d:%03d", hrs, min, sec, mls);
        //System.out.println(toRet);
        return toRet;
    }
}