Java定時(shí)器Timer

shiina 發(fā)布于2019-08-14 17:08 / 2530人閱讀

摘要：定時(shí)器概述主要用于線程里指定時(shí)間或周期運(yùn)行任務(wù)。同時(shí)指定關(guān)聯(lián)線程的名稱和是否作為。以當(dāng)前時(shí)間為基準(zhǔn)，延遲指定的毫秒后，再按指定的時(shí)間間隔地?zé)o限次數(shù)的執(zhí)行任務(wù)。使用示例執(zhí)行結(jié)果說明指定的之間早于當(dāng)前時(shí)間，則立刻執(zhí)行。

Java定時(shí)器Timer 概述

主要用于Java線程里指定時(shí)間或周期運(yùn)行任務(wù)。Timer是線程安全的，但不提供實(shí)時(shí)性(real-time)保證。

構(gòu)造函數(shù) Timer()

默認(rèn)構(gòu)造函數(shù)。

Timer(boolean)

指定關(guān)聯(lián)線程是否作為daemon線程。

Timer(String)

指定關(guān)聯(lián)線程的名稱。

Timer(String, boolean)

同時(shí)指定關(guān)聯(lián)線程的名稱和是否作為daemon。

schdule方法 schedule(TimerTask task, long delay)

以當(dāng)前時(shí)間為基準(zhǔn)，延遲指定的毫秒后執(zhí)行一次TimerTask任務(wù)。

schedule(TimerTask task, Date time)

在指定的日期執(zhí)行一次TimerTask任務(wù)。

如果日期time早于當(dāng)前時(shí)間，則立刻執(zhí)行。

使用示例

public class Demo {
    private static Timer timer = new Timer();

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Run Time：" + new Date().toString());
        }
    }
    
    public static void main(String[] args) {
        try {
            MyTask task = new MyTask();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = "2016-12-27 14:36:00";
            Date date = sdf.parse(dateStr);
            System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
            timer.schedule(task, date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

執(zhí)行結(jié)果

Date = Tue Dec 27 14:36:00 CST 2016 NowTime = Tue Dec 27 21:28:04 CST 2016
Run Time：Tue Dec 27 21:28:04 CST 2016

說明是立刻執(zhí)行。

schedule(TimerTask task, long delay, long period)

以當(dāng)前時(shí)間為基準(zhǔn)，延遲指定的毫秒后，再按指定的時(shí)間間隔地?zé)o限次數(shù)的執(zhí)行TimerTask任務(wù)。(fixed-delay execution)

使用示例

public class Demo {
    private static Timer timer = new Timer();

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Run Time: " + new Date().toString());
        }
    }

    public static void main(String[] args) {
        MyTask task = new MyTask();
        System.out.println("Now Time: " + new Date().toString());
        timer.schedule(task, 3000, 5000);
    }
}

執(zhí)行結(jié)果

Now Time: Tue Dec 27 21:34:59 CST 2016
Run Time: Tue Dec 27 21:35:02 CST 2016
Run Time: Tue Dec 27 21:35:07 CST 2016
Run Time: Tue Dec 27 21:35:12 CST 2016
Run Time: Tue Dec 27 21:35:17 CST 2016

說明以當(dāng)前基準(zhǔn)時(shí)間延遲3秒后執(zhí)行一次，以后按指定間隔時(shí)間5秒無限次數(shù)的執(zhí)行。

schedule(TimerTask task, Date firstTime, long period)

在指定的日期之后，按指定的時(shí)間間隔地?zé)o限次數(shù)的執(zhí)行TimerTask任務(wù)。(fixed-delay execution)

如果日期firstTime早于當(dāng)前時(shí)間，則立刻執(zhí)行，且不執(zhí)行在時(shí)間差內(nèi)的任務(wù)。

使用示例

public class Demo {
    private static Timer timer = new Timer();

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Run Time：" + new Date().toString());
        }

        public static void main(String[] args) {
            try {
                MyTask task = new MyTask();
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String dateStr = "2016-12-27 14:36:00";
                Date date = sdf.parse(dateStr);
                System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
                timer.schedule(task, date, 3000);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
    }
}

執(zhí)行結(jié)果

Date = Tue Dec 27 14:36:00 CST 2016 NowTime = Tue Dec 27 21:43:30 CST 2016
Run Time：Tue Dec 27 21:43:30 CST 2016
Run Time：Tue Dec 27 21:43:33 CST 2016
Run Time：Tue Dec 27 21:43:36 CST 2016

說明指定的之間早于當(dāng)前時(shí)間，則立刻執(zhí)行，不會(huì)補(bǔ)充時(shí)間差內(nèi)的任務(wù)。

scheduleAtFixedRate方法 scheduleAtFixedRate(TimerTask task, long delay, long period)

以當(dāng)前時(shí)間為基準(zhǔn)，延遲指定的毫秒后，再按指定的時(shí)間間隔周期性地?zé)o限次數(shù)的執(zhí)行TimerTask任務(wù)。(fixed-rate execution)

使用示例

public class Demo {
    private static Timer timer = new Timer();

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Run Time: " + new Date().toString());
        }
    }

    public static void main(String[] args) {
        MyTask task = new MyTask();
        System.out.println("Now Time: " + new Date().toString());
        timer.scheduleAtFixedRate(task, 3000, 5000);
    }
}

執(zhí)行結(jié)果

Now Time: Tue Dec 27 21:58:03 CST 2016
Run Time: Tue Dec 27 21:58:06 CST 2016
Run Time: Tue Dec 27 21:58:11 CST 2016
Run Time: Tue Dec 27 21:58:16 CST 2016
Run Time: Tue Dec 27 21:58:21 CST 2016

說明以當(dāng)前基準(zhǔn)時(shí)間延遲3秒后執(zhí)行一次，以后按指定間隔時(shí)間5秒無限次數(shù)的執(zhí)行。

scheduleAtFixedRate(TimerTask task, Date firstTime, long period)

在指定的日期之后，按指定的時(shí)間間隔周期性地?zé)o限次數(shù)的執(zhí)行TimerTask任務(wù)。(fixed-rate execution)

如果日期firstTime早于當(dāng)前時(shí)間，則立即執(zhí)行，并補(bǔ)充性的執(zhí)行在時(shí)間差內(nèi)的任務(wù)。

使用示例

public class Demo {
    private static Timer timer = new Timer();

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            System.out.println("Run Time：" + new Date().toString());
        }

        public static void main(String[] args) {
            try {
                MyTask task = new MyTask();
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                String dateStr = "2016-12-27 22:02:00";
                Date date = sdf.parse(dateStr);
                System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
                timer.scheduleAtFixedRate(task, date, 5000);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
    }
}

執(zhí)行結(jié)果

Date = Tue Dec 27 22:02:00 CST 2016 NowTime = Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:54 CST 2016
Run Time：Tue Dec 27 22:02:55 CST 2016
Run Time：Tue Dec 27 22:03:00 CST 2016
Run Time：Tue Dec 27 22:03:05 CST 2016

說明指定的之間早于當(dāng)前時(shí)間，則立刻執(zhí)行。

在時(shí)間22:02:00--22:02:54內(nèi)大約有11個(gè)5秒間隔，則優(yōu)先補(bǔ)充性的執(zhí)行在時(shí)間差內(nèi)的任務(wù)，然后在22:02:55補(bǔ)充完畢(執(zhí)行12次。ps：0-55秒?yún)^(qū)間段內(nèi)首位都算上，正好觸發(fā)12次)，此后每隔5秒執(zhí)行一次定時(shí)任務(wù)。

執(zhí)行任務(wù)延時(shí)對(duì)比之 schedule 和 scheduleAtFixedRate schedule不延時(shí)

使用示例

public class Demo {
    private static Timer timer = new Timer();
    private static int runCount = 0;

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            try {
                System.out.println("Begin Run Time: " + new Date().toString());
                Thread.sleep(3000);
                System.out.println("End Run Time: " + new Date().toString());
                runCount++;
                if (runCount == 3) {
                    timer.cancel();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }

    public static void main(String[] args) {
        try {
            MyTask task = new MyTask();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = "2016-12-27 14:36:00";
            Date date = sdf.parse(dateStr);
            System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
            timer.schedule(task, date, 5000);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

執(zhí)行結(jié)果

早于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 14:36:00 CST 2016 NowTime = Tue Dec 27 22:23:37 CST 2016
Begin Run Time: Tue Dec 27 22:23:37 CST 2016
End Run Time: Tue Dec 27 22:23:40 CST 2016
Begin Run Time: Tue Dec 27 22:23:42 CST 2016
End Run Time: Tue Dec 27 22:23:45 CST 2016
Begin Run Time: Tue Dec 27 22:23:47 CST 2016
End Run Time: Tue Dec 27 22:23:50 CST 2016

Process finished with exit code 0

晚于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:42:00 CST 2016 NowTime = Tue Dec 27 22:41:54 CST 2016
Begin Run Time: Tue Dec 27 22:42:00 CST 2016
End Run Time: Tue Dec 27 22:42:03 CST 2016
Begin Run Time: Tue Dec 27 22:42:05 CST 2016
End Run Time: Tue Dec 27 22:42:08 CST 2016
Begin Run Time: Tue Dec 27 22:42:10 CST 2016
End Run Time: Tue Dec 27 22:42:13 CST 2016

Process finished with exit code 0

不管早還是晚于基準(zhǔn)時(shí)間，都不進(jìn)行補(bǔ)償，下一次任務(wù)的執(zhí)行時(shí)間參考的是上一次任務(wù)的開始時(shí)間點(diǎn)來計(jì)算。

schedule延時(shí)

使用示例

public class Demo {
    private static Timer timer = new Timer();
    private static int runCount = 0;

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            try {
                System.out.println("Begin Run Time: " + new Date().toString());
                Thread.sleep(5000);
                System.out.println("End Run Time: " + new Date().toString());
                runCount++;
                if (runCount == 3) {
                    timer.cancel();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }

    public static void main(String[] args) {
        try {
            MyTask task = new MyTask();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = "2016-12-27 22:42:00";
            Date date = sdf.parse(dateStr);
            System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
            timer.schedule(task, date, 3000);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

執(zhí)行結(jié)果

早于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:42:00 CST 2016 NowTime = Tue Dec 27 22:45:17 CST 2016
Begin Run Time: Tue Dec 27 22:45:17 CST 2016
End Run Time: Tue Dec 27 22:45:22 CST 2016
Begin Run Time: Tue Dec 27 22:45:22 CST 2016
End Run Time: Tue Dec 27 22:45:27 CST 2016
Begin Run Time: Tue Dec 27 22:45:27 CST 2016
End Run Time: Tue Dec 27 22:45:32 CST 2016

Process finished with exit code 0

晚于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:47:00 CST 2016 NowTime = Tue Dec 27 22:46:27 CST 2016
Begin Run Time: Tue Dec 27 22:47:00 CST 2016
End Run Time: Tue Dec 27 22:47:05 CST 2016
Begin Run Time: Tue Dec 27 22:47:05 CST 2016
End Run Time: Tue Dec 27 22:47:10 CST 2016
Begin Run Time: Tue Dec 27 22:47:10 CST 2016
End Run Time: Tue Dec 27 22:47:15 CST 2016

Process finished with exit code 0

不管早還是晚于當(dāng)前基準(zhǔn)時(shí)間，都不進(jìn)行補(bǔ)償，下一次任務(wù)的執(zhí)行時(shí)間都是參考上一次任務(wù)結(jié)束的時(shí)間點(diǎn)來計(jì)算。

scheduleAtFixedRate不延時(shí)

使用示例

public class Demo {
    private static Timer timer = new Timer();
    private static int runCount = 0;

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            try {
                System.out.println("Begin Run Time: " + new Date().toString());
                Thread.sleep(3000);
                System.out.println("End Run Time: " + new Date().toString());
                runCount++;
                if (runCount == 1000) {
                    timer.cancel();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        try {
            MyTask task = new MyTask();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = "2016-12-27 22:51:42";
            Date date = sdf.parse(dateStr);
            System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
            timer.scheduleAtFixedRate(task, date, 5000);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

執(zhí)行結(jié)果

早于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:51:42 CST 2016 NowTime = Tue Dec 27 22:51:57 CST 2016
Begin Run Time: Tue Dec 27 22:51:57 CST 2016
End Run Time: Tue Dec 27 22:52:00 CST 2016
Begin Run Time: Tue Dec 27 22:52:00 CST 2016
End Run Time: Tue Dec 27 22:52:03 CST 2016
Begin Run Time: Tue Dec 27 22:52:03 CST 2016
End Run Time: Tue Dec 27 22:52:06 CST 2016
Begin Run Time: Tue Dec 27 22:52:06 CST 2016
End Run Time: Tue Dec 27 22:52:09 CST 2016
Begin Run Time: Tue Dec 27 22:52:09 CST 2016
End Run Time: Tue Dec 27 22:52:12 CST 2016
Begin Run Time: Tue Dec 27 22:52:12 CST 2016
End Run Time: Tue Dec 27 22:52:15 CST 2016
Begin Run Time: Tue Dec 27 22:52:15 CST 2016
End Run Time: Tue Dec 27 22:52:18 CST 2016
Begin Run Time: Tue Dec 27 22:52:18 CST 2016
End Run Time: Tue Dec 27 22:52:21 CST 2016
Begin Run Time: Tue Dec 27 22:52:22 CST 2016
End Run Time: Tue Dec 27 22:52:25 CST 2016
Begin Run Time: Tue Dec 27 22:52:27 CST 2016
End Run Time: Tue Dec 27 22:52:30 CST 2016
Begin Run Time: Tue Dec 27 22:52:32 CST 2016
End Run Time: Tue Dec 27 22:52:35 CST 2016
Begin Run Time: Tue Dec 27 22:52:37 CST 2016
End Run Time: Tue Dec 27 22:52:40 CST 2016
Begin Run Time: Tue Dec 27 22:52:42 CST 2016
End Run Time: Tue Dec 27 22:52:45 CST 2016
Begin Run Time: Tue Dec 27 22:52:47 CST 2016
End Run Time: Tue Dec 27 22:52:50 CST 2016
Begin Run Time: Tue Dec 27 22:52:52 CST 2016
End Run Time: Tue Dec 27 22:52:55 CST 2016
Begin Run Time: Tue Dec 27 22:52:57 CST 2016
End Run Time: Tue Dec 27 22:53:00 CST 2016

Process finished with exit code 0

晚于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:37:00 CST 2016 NowTime = Tue Dec 27 22:36:06 CST 2016
Begin Run Time: Tue Dec 27 22:37:00 CST 2016
End Run Time: Tue Dec 27 22:37:03 CST 2016
Begin Run Time: Tue Dec 27 22:37:05 CST 2016
End Run Time: Tue Dec 27 22:37:08 CST 2016
Begin Run Time: Tue Dec 27 22:37:10 CST 2016
End Run Time: Tue Dec 27 22:37:13 CST 2016

Process finished with exit code 0

不延時(shí)的情況下，當(dāng)早于基準(zhǔn)時(shí)間時(shí)，時(shí)間差內(nèi)的執(zhí)行任務(wù)未補(bǔ)償完時(shí)，下一次執(zhí)行任務(wù)的時(shí)間參考的是上一次執(zhí)行任務(wù)的結(jié)束時(shí)間；一旦補(bǔ)償完畢（注意粗體時(shí)間點(diǎn)），下一次執(zhí)行任務(wù)的時(shí)間參考的是上一次執(zhí)行任務(wù)的開始時(shí)間；當(dāng)晚于基準(zhǔn)時(shí)間時(shí)，下一次執(zhí)行任務(wù)的時(shí)間參考的是上一次執(zhí)行任務(wù)的開始時(shí)間。

scheduleAtFixedRate延時(shí)

使用示例

public class Demo {
    private static Timer timer = new Timer();
    private static int runCount = 0;

    public static class MyTask extends TimerTask {
        @Override
        public void run() {
            try {
                System.out.println("Begin Run Time: " + new Date().toString());
                Thread.sleep(5000);
                System.out.println("End Run Time: " + new Date().toString());
                runCount++;
                if (runCount == 3) {
                    timer.cancel();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }

    public static void main(String[] args) {
        try {
            MyTask task = new MyTask();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String dateStr = "2016-12-27 22:28:00";
            Date date = sdf.parse(dateStr);
            System.out.println("Date = " + date.toString() + " NowTime = " + new Date().toString());
            timer.scheduleAtFixedRate(task, date, 3000);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

執(zhí)行結(jié)果

早于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 23:01:00 CST 2016 NowTime = Tue Dec 27 23:01:19 CST 2016
Begin Run Time: Tue Dec 27 23:01:19 CST 2016
End Run Time: Tue Dec 27 23:01:24 CST 2016
Begin Run Time: Tue Dec 27 23:01:24 CST 2016
End Run Time: Tue Dec 27 23:01:29 CST 2016
Begin Run Time: Tue Dec 27 23:01:29 CST 2016
End Run Time: Tue Dec 27 23:01:34 CST 2016
Begin Run Time: Tue Dec 27 23:01:34 CST 2016
End Run Time: Tue Dec 27 23:01:39 CST 2016

晚于當(dāng)前基準(zhǔn)時(shí)間

Date = Tue Dec 27 22:28:00 CST 2016 NowTime = Tue Dec 27 22:27:55 CST 2016
Begin Run Time: Tue Dec 27 22:28:00 CST 2016
End Run Time: Tue Dec 27 22:28:05 CST 2016
Begin Run Time: Tue Dec 27 22:28:05 CST 2016
End Run Time: Tue Dec 27 22:28:10 CST 2016
Begin Run Time: Tue Dec 27 22:28:10 CST 2016
End Run Time: Tue Dec 27 22:28:15 CST 2016

Process finished with exit code 0

延時(shí)的情況下，即使是早于基準(zhǔn)時(shí)間，由于延時(shí)效應(yīng)，根本不可能補(bǔ)償完畢時(shí)間差內(nèi)的執(zhí)行任務(wù)，故而在延時(shí)的情況下，下一次任務(wù)的執(zhí)行時(shí)間都是參考上一次任務(wù)結(jié)束的時(shí)間來計(jì)算。

對(duì)比總結(jié)

	執(zhí)行任務(wù)不延時(shí)	執(zhí)行任務(wù)延時(shí)
早于當(dāng)前基準(zhǔn)時(shí)間	schedule：下一次任務(wù)的執(zhí)行時(shí)間參考的是上一次任務(wù)的開始時(shí)間來計(jì)算。 scheduleAtFixedRate：當(dāng)早于基準(zhǔn)時(shí)間時(shí)，時(shí)間差內(nèi)的執(zhí)行任務(wù)未補(bǔ)償完時(shí)，下一次執(zhí)行任務(wù)的時(shí)間參考的是上一次任務(wù)的結(jié)束時(shí)間；一旦補(bǔ)償完畢，下一次執(zhí)行任務(wù)的時(shí)間參考上一次任務(wù)的開始時(shí)間來計(jì)算。	二者一樣。下一次任務(wù)的執(zhí)行時(shí)間都是參考上一次任務(wù)的結(jié)束時(shí)間來計(jì)算。
晚于當(dāng)前基準(zhǔn)時(shí)間	二者一樣。下一次任務(wù)的執(zhí)行時(shí)間參考的是上一次任務(wù)的開始時(shí)間來計(jì)算。	二者一樣。下一次任務(wù)的執(zhí)行時(shí)間都是參考上一次任務(wù)的結(jié)束時(shí)間來計(jì)算。

注意：scheduleAtFixedRate示例中firstTime是有區(qū)別的，而結(jié)果證明是有補(bǔ)償性操作的。

(END)

GPU云服務(wù)器云服務(wù)器 timer定時(shí)器 java_timer用法 java定時(shí)器定時(shí)器java

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