quartz performs tasks on a regular basis and configure the operation method of ES1en.xml

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>