devtools-cron4j是一款玲珑实用的Java调度工具包，来自于devtools系列，它提供了：
- 面向API的形式来自定义cron表达式，又能将cron表达式解析为API的模式
- 内置多种调度器可定时执行指标内容
- 不依赖其余组件，可轻量化地定制本人的零碎
Maven:
<dependency> <groupId>com.github.paganini2008</groupId> <artifactId>devtools-cron4j</artifactId> <version>2.0.2</version> </dependency>Jdk版本： 1.8+
对于如何生成cron表达式，能够参照上面官网例子：
// */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
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
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);如何运行调度程序
CronExpression expression = CronExpressionBuilder.everySecond(5); ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.schedule(new Task() { @Override public boolean execute() { System.out.println("Run at: " + DateUtils.format(System.currentTimeMillis())); 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();源码地址：https://github.com/paganini20...