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                通過注解 @Scheduled 指定的時間一開始就固定的,不能修改。想要修改定時任務執行的時間,可以如下編寫代碼。 <br/> **1. 實現接口 SchedulingConfigurer 創建定時任務** ```java @Slf4j @Component public class StudentTaskConfig implements SchedulingConfigurer { @Override public void configureTasks(ScheduledTaskRegistrar taskRegistrar) { taskRegistrar.addTriggerTask(new Runnable() { @Override public void run() { //業務代碼放在這里 log.info("業務代碼!"); } }, new Trigger() { @Override public Date nextExecutionTime(TriggerContext triggerContext) { //有兩個主要的觸發器: //1. CronTrigger觸發器:根據cron表達式來表達時間。 //2. PeriodicTrigger觸發器:可隨意設置循環間隔時間,單位為毫秒。 //GlobalCron.cronMap.get("cron")是我定義的一個static Map變量 CronTrigger cronTrigger = new CronTrigger(GlobalCron.cronMap.get("cron")); Date nextExecutionTime = cronTrigger.nextExecutionTime(triggerContext); return nextExecutionTime; } }); } } ``` **2. 初始化cron表達式** ```java @EnableScheduling @SpringBootApplication public class Springboot04TaskApplication { public static void main(String[] args) { //初始化cron表達式 GlobalCron.cronMap.put("cron", "0/4 * * * * MON-SAT"); SpringApplication.run(Springboot04TaskApplication.class, args); } } ``` **3. 修改cron表達式** ```java @GetMapping("update") public String update(@RequestParam("cron") String cron) { GlobalCron.cronMap.put("cron", cron); return "Update Ok!"; } ```
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