quartz performs tasks on a regular basis and configure the operation method of ES1en.xml
- 2020-08-22 22:06:47
- OfStack
I need to do a regular task in the project today. If I learn it temporarily, quartz still has very strong functions and is convenient to use. demo here only implements regular execution once a day.
1. maven dependence:
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz-jobs</artifactId>
<version>2.2.3</version>
</dependency>
2. Doem:
TimingTaskSchedule needs to implement the ServletContextListener interface and listen for the boot class when the project is started
package com.thinkgem.jeesite.modules.sys.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class TimingTaskSchedule implements ServletContextListener{
// This event is executed when the server starts
@Override
public void contextInitialized(ServletContextEvent arg0) {
try {
QuartzLoad.run();
} catch (Exception e) {
e.printStackTrace();
}
}
// This event is executed when the server is stopped
@Override
public void contextDestroyed(ServletContextEvent arg0) {
try {
QuartzLoad.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
This 0, 0, 0, 0, #63; * * denotes one execution at 00:00:00 per day
From left to right, they represent seconds, days, months, weeks and years
? I don't care * I can ignore it every year
package com.thinkgem.jeesite.modules.sys.listener;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.Job;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import com.thinkgem.jeesite.modules.sys.listener.job;
public class QuartzLoad {
private static Scheduler sched;
public static void run() throws Exception {
System.out.println(" Timed task start ");
JobDetail jobDetail = JobBuilder.newJob((Class<? extends Job>) job.class)
.withIdentity("myjob", "group1").build();
CronTrigger trigger =(CronTrigger) TriggerBuilder.newTrigger()
.withIdentity("trigger", "group1")
.withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 ? * *"))
.build();
SchedulerFactory sfact = new StdSchedulerFactory();
Scheduler schedule = sfact.getScheduler();
schedule.start();
schedule.scheduleJob(jobDetail, trigger);
}
// stop
public static void stop() throws Exception{
sched.shutdown();
}
}
Job is its own business process
package com.thinkgem.jeesite.modules.sys.listener;
import java.text.SimpleDateFormat;
import java.util.Date;import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class job implements Job{
public void execute(JobExecutionContext arg0) throws JobExecutionException {
Date date=new Date();
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("Time:"+sf.format(date));
System.out.println("Hello");
}
}
}
}
3. web.xml listening:
com.thinkgem.jeesite.modules.sys.listener.TimingTaskSchedule
<listener>
<listener-class>com.thinkgem.jeesite.modules.sys.listener.TimingTaskSchedule</listener-class>
</listener>