Java定时调度工具包devtools-cron4j使用介绍

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devtools-cron4j是一款小巧实用的Java调度工具包，来自于devtools系列，它提供了：

支持以API方式来定义cron表达式
内置多种调度器实现(Timer, Executor等)
支持中断策略(Cancellable)

安装:

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<dependency>
<groupId>com.github.paganini2008</groupId>
<artifactId>devtools-cron4j</artifactId>
<version>2.0.3</version>
</dependency>

兼容性

Jdk1.8+

如何生成cron表达式？

参考例子：

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// */5 * * * * ?
public static CronExpression getCron1() {
return CronExpressionBuilder.everySecond(5);
}
// 0 */2 * * * ?
public static CronExpression getCron2() {
return CronExpressionBuilder.everyMinute(2);
}
// 0 26,29,33 * * * ?
public static CronExpression getCron3() {
return CronExpressionBuilder.everyHour().minute(26).andMinute(29).andMinute(33);
}
// 0 * 14 * * ?
public static CronExpression getCron4() {
return CronExpressionBuilder.everyDay().hour(14).everyMinute();
}
// 0 0-10 15 * * ?
public static CronExpression getCron5() {
return CronExpressionBuilder.everyDay().hour(15).minute(0).toMinute(10);
}
// 0 0 23 * * ?
public static CronExpression getCron6() {
return CronExpressionBuilder.everyDay().at(23, 0);
}
// 0 15 12 * * ?
public static CronExpression getCron7() {
return CronExpressionBuilder.everyDay().hour(12).minute(15);
}
// 0 0 0,13,18,21 * * ?
public static CronExpression getCron8() {
return CronExpressionBuilder.hour(13).andHour(18).andHour(21);
}
// 0 15 10 ? * 6L
public static CronExpression getCron9() {
return CronExpressionBuilder.everyMonth().lastWeek().Fri().at(10, 15);
}
// 0 15 10 ? * MON-FRI
public static CronExpression getCron10() {
return CronExpressionBuilder.everyWeek().Mon().toFri().at(10, 15, 0);
}
// 0 0/5 12,18 * * ?
public static CronExpression getCron11() {
return CronExpressionBuilder.hour(12).andHour(18).everyMinute(5);
}
// 0 30 23 L * ?
public static CronExpression getCron12() {
return CronExpressionBuilder.everyMonth().lastDay().at(23, 30);
}
// 0 10,20,30 12 ? 7-11 6L 2021-2025
public static CronExpression getCron13() {
return CronExpressionBuilder.year(2021).toYear(2025).Aug().toDec().lastWeek().Fri().hour(12).minute(10).andMinute(20).andMinute(30);
}
// 0 10 23 ? * 6#3
public static CronExpression getCron14() {
return CronExpressionBuilder.everyMonth().week(3).Fri().at(23, 10);
}
// 0 15-50/2 0-6 10-28 * ?
public static CronExpression getCron15() {
return CronExpressionBuilder.everyMonth().day(10).toDay(28).hour(0).toHour(6).minute(15).toMinute(50, 2);
}

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// */5 * * * * ?
public static CronExpression getCron1() {
return CronExpressionBuilder.everySecond(5);
}
// 0 */2 * * * ?
public static CronExpression getCron2() {
return CronExpressionBuilder.everyMinute(2);
}
// 0 26,29,33 * * * ?
public static CronExpression getCron3() {
return CronExpressionBuilder.everyHour().minute(26).andMinute(29).andMinute(33);
}
// 0 * 14 * * ?
public static CronExpression getCron4() {
return CronExpressionBuilder.everyDay().hour(14).everyMinute();
}
// 0 0-10 15 * * ?
public static CronExpression getCron5() {
return CronExpressionBuilder.everyDay().hour(15).minute(0).toMinute(10);
}
// 0 0 23 * * ?
public static CronExpression getCron6() {
return CronExpressionBuilder.everyDay().at(23, 0);
}
// 0 15 12 * * ?
public static CronExpression getCron7() {
return CronExpressionBuilder.everyDay().hour(12).minute(15);
}
// 0 0 0,13,18,21 * * ?
public static CronExpression getCron8() {
return CronExpressionBuilder.hour(13).andHour(18).andHour(21);
}
// 0 15 10 ? * 6L
public static CronExpression getCron9() {
return CronExpressionBuilder.everyMonth().lastWeek().Fri().at(10, 15);
}
// 0 15 10 ? * MON-FRI
public static CronExpression getCron10() {
return CronExpressionBuilder.everyWeek().Mon().toFri().at(10, 15, 0);
}
// 0 0/5 12,18 * * ?
public static CronExpression getCron11() {
return CronExpressionBuilder.hour(12).andHour(18).everyMinute(5);
}
// 0 30 23 L * ?
public static CronExpression getCron12() {
return CronExpressionBuilder.everyMonth().lastDay().at(23, 30);
}
// 0 10,20,30 12 ? 7-11 6L 2021-2025
public static CronExpression getCron13() {
return CronExpressionBuilder.year(2021).toYear(2025).Aug().toDec().lastWeek().Fri().hour(12).minute(10).andMinute(20).andMinute(30);
}
// 0 10 23 ? * 6#3
public static CronExpression getCron14() {
return CronExpressionBuilder.everyMonth().week(3).Fri().at(23, 10);
}
// 0 15-50/2 0-6 10-28 * ?
public static CronExpression getCron15() {
return CronExpressionBuilder.everyMonth().day(10).toDay(28).hour(0).toHour(6).minute(15).toMinute(50, 2);
}

如何解析cron表达式？

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System.out.println(CRON.parse("*/5 * * * * ?"));
System.out.println(CRON.parse("0 */2 * * * ?"));
System.out.println(CRON.parse("0 15 10 LW * ?"));
System.out.println(CRON.parse("0 0 12 10W * ?"));
System.out.println(CRON.parse("0 15 10 ? * MON-FRI"));
System.out.println(CRON.parse("0 26,29,33 * * * ?"));
System.out.println(CRON.parse("0 15-50/2 0-6 10-28 * ?"));
System.out.println(CRON.parse("0 10 23 ? * 6#3"));
System.out.println(CRON.parse("0 10,20,30 12 ? 7-11 6L 2021-2025"));

如何测试cron表达式？

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CRON.parse("0 30 23 L * ?").forEach(date -> {
System.out.println(DateUtils.format(date));
}, 20);
System.out.println("-----------------------------------------");
CRON.parse("0 0 12 10-15 * ?").forEach(date -> {
System.out.println(DateUtils.format(date));
}, 20);

如何执行调度程序？

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CronExpression expression = CronExpressionBuilder.everySecond(5);
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.schedule(new Task() {
@Override
public boolean execute() {
System.out.println("Task is running at: " + new Date());
return true;
}
@Override
public Cancellable cancellable() {
return Cancellables.cancelIfRuns(-1);
}
@Override
public void onCancellation(Throwable e) {
System.out.println("Cancelled.");
}
}, expression);
System.in.read();
executor.close();