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今天小編給大家分享一下Java中的Quartz如何使用的相關知識點,內容詳細,邏輯清晰,相信大部分人都還太了解這方面的知識,所以分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后有所收獲,下面我們一起來了解一下吧。
Scheduler 每次執行,都會根據JobDetail創建一個新的Job實例,這樣就可以規避并發訪問的問題(jobDetail的實例也是新的)
Quzrtz 定時任務默認都是并發執行,不會等待上一次任務執行完畢,只要間隔時間到就會執行,如果定時任務執行太長,會長時間占用資源,導致其它任務堵塞
@DisallowConcurrentExecution: job類上,禁止并發地執行同一個job定義 (JobDetail定義的)的多個實例。
scheduler:可以理解為定時任務的工作容器或者說是工作場所,所有定時任務都是放在里面工作,可以開啟和停止。
trigger:可以理解為是定時任務任務的工作規則配置,例如說,沒個幾分鐘調用一次,或者說指定每天那個時間點執行。
jobDetail:定時任務的信息,例如配置定時任務的名字,群組之類的。
job:定時任務的真正的業務處理邏輯的地方。
TestClient.Java
import org.quartz.*; import org.quartz.impl.StdSchedulerFactory; public class TaskClient { public static void main(String[] args) { JobDetail jobDetail = JobBuilder.newJob(TaskJob.class) .withIdentity("job1", "group1") //設置JOB的名字和組 .build(); Trigger trigger = TriggerBuilder.newTrigger() .withIdentity("trigger1", "trigger1") .startNow() .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1) .repeatForever()) .build(); try { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); scheduler.scheduleJob(jobDetail,trigger); scheduler.start(); } catch (SchedulerException ex) { ex.printStackTrace(); } } }
TaskJob.Java
import cn.hutool.core.date.DateUtil; import org.quartz.Job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; public class TaskJob implements Job { @Override public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException { System.out.println("TaskJob => " + DateUtil.now()); } }
通過 usingJobData 往定時任務中傳遞參數
import org.quartz.*; import org.quartz.impl.StdSchedulerFactory; public class TaskClient { public static void main(String[] args) { JobDetail jobDetail = JobBuilder.newJob(TaskJob.class) .withIdentity("job1", "group1") .usingJobData("job","jobDetail1.JobDataMap.Value") .build(); Trigger trigger = TriggerBuilder.newTrigger() .withIdentity("trigger1", "trigger1") .usingJobData("trigger","trigger.JobDataMap.Value") .startNow() .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1) .repeatForever()) .build(); try { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); scheduler.scheduleJob(jobDetail,trigger); scheduler.start(); } catch (SchedulerException ex) { ex.printStackTrace(); } } }
TaskJob.java
import org.quartz.Job; import org.quartz.JobDataMap; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; public class TaskJob implements Job { @Override public void execute(JobExecutionContext context) throws JobExecutionException { JobDataMap jobDataMap = context.getJobDetail().getJobDataMap(); JobDataMap triggerMap = context.getTrigger().getJobDataMap(); JobDataMap mergeMap = context.getMergedJobDataMap(); System.out.println("jobDataMap => " + jobDataMap.getString("job")); System.out.println("triggerMap => " + triggerMap.getString("trigger")); System.out.println("mergeMap => " + mergeMap.getString("trigger")); } }
通過屬性賦值
import org.quartz.*; import org.quartz.impl.StdSchedulerFactory; public class TaskClient { public static void main(String[] args) { JobDetail jobDetail = JobBuilder.newJob(TaskJob.class) .withIdentity("job1", "group1") .usingJobData("job","jobDetail1.JobDataMap.Value") .usingJobData("name","jobDetail1.name.Value") //通過 setName 自動賦值 .build(); Trigger trigger = TriggerBuilder.newTrigger() .withIdentity("trigger1", "trigger1") .usingJobData("trigger","trigger.JobDataMap.Value") .usingJobData("name","trigger.name.Value") //如果 Trigger 有值,會覆蓋 JobDetail .startNow() .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1) .repeatForever()) .build(); try { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); scheduler.scheduleJob(jobDetail,trigger); scheduler.start(); } catch (SchedulerException ex) { ex.printStackTrace(); } } }
import org.quartz.*; public class TaskJob implements Job { private String name; public void setName(String name) { this.name = name; } @Override public void execute(JobExecutionContext context) throws JobExecutionException { System.out.println("name => " + name); } }
@DisallowConcurrentExecution job類上,禁止并發地執行同一個job定義 (JobDetail定義的)的多個實例。
import cn.hutool.core.date.DateUtil; import org.quartz.*; @DisallowConcurrentExecution public class TaskJob implements Job { @Override public void execute(JobExecutionContext context) { System.out.println("Time => " + DateUtil.now()); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } } }
@PersistJobDataAfterExecution
持久化JobDetail中的JobDataMap(對 trigger 中的 datamap 無效),如果一個任務不是
import cn.hutool.core.date.DateUtil; import org.quartz.*; //持久化JobDetail中的JobDataMap(對 trigger 中的 datamap 無效),如果一個任務不是 @PersistJobDataAfterExecution public class TaskJob implements Job { @Override public void execute(JobExecutionContext context) { JobDataMap triggerMap = context.getJobDetail().getJobDataMap(); triggerMap.put("count", triggerMap.getInt("count") + 1); System.out.println("Time => " + DateUtil.now() + " count =>" + triggerMap.getInt("count")); } }
Client
import org.quartz.*; import org.quartz.impl.StdSchedulerFactory; public class TaskClient { public static void main(String[] args) { JobDetail jobDetail = JobBuilder.newJob(TaskJob.class) .withIdentity("job1", "group1") .usingJobData("job","jobDetail1.JobDataMap.Value") .usingJobData("name","jobDetail1.name.Value") //通過 setName 自動賦值 .usingJobData("count",0) //通過 setName 自動賦值 .build(); Trigger trigger = TriggerBuilder.newTrigger() .withIdentity("trigger1", "trigger1") .usingJobData("trigger","trigger.JobDataMap.Value") .usingJobData("name","trigger.name.Value") //如果 Trigger 有值,會覆蓋 JobDetail .startNow() .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1) .repeatForever()) .build(); try { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); scheduler.scheduleJob(jobDetail,trigger); scheduler.start(); } catch (SchedulerException ex) { ex.printStackTrace(); } } }
以上就是“Java中的Quartz如何使用”這篇文章的所有內容,感謝各位的閱讀!相信大家閱讀完這篇文章都有很大的收獲,小編每天都會為大家更新不同的知識,如果還想學習更多的知識,請關注億速云行業資訊頻道。
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