introduce

Quartz is an open source job scheduling framework written entirely in Java. It has many features, such as database support, clustering, plug-ins, EJB job pre-construction, JavaMail and others, support for cron-like expressions, and so on. The project has been acquired by Terracotta.

Introduction to Quartz API

The key interfaces of the Quartz API are as follows:

Interface class object:

• Scheduler: The most important API interface related to task scheduling.
• Job: The component definition (what the scheduler executes) that you expect the task to be scheduled to execute must all implement the interface.
• Trigger: Defines when a specified Job is executed, also known as a trigger.

Objects used to create examples:

• JobDetail: An instance used to define a Job.
• JobBuilder: An instance used to define or create a JobDetail, which limits instances that can only be Jobs.
• TriggerBuilder: An instance used to define or create triggers.

Environmental Science

• idea
• maven
• springboot

case

Introduction Case-1

It's not as good as running the code directly to get the result, so do it.

The pom.xml configuration is as follows:

 <!-- quartz -->
    <dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
    </dependency>
    <dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz-jobs</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>5.0.7.RELEASE</version>
    </dependency>

Class job

@Data
public class HelloJob implements Job {

    public void execute(JobExecutionContext context) throws JobExecutionException {
        JobDataMap jobDataMap = context.getJobDetail().getJobDataMap();
        String name = jobDataMap.get("name").toString();
        String characteristic = jobDataMap.get("characteristic").toString();

        System.out.println("name : " + name);
        System.out.println("characteristic : " + characteristic);

    }
}

QuartzTest class

public class QuartzTest {

    public static void main(String[] args) throws SchedulerException, ParseException {
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        Scheduler scheduler = schedulerFactory.getScheduler();
        scheduler.start();

        // Define job s, bind our scheduled tasks
        JobDetail job2 = newJob(HelloJob.class)
                .usingJobData("name", "Zhang San")
                .usingJobData("characteristic", "Handsome 3")
                .build();

        // Execute tasks, using defined triggers and tasks
        scheduler.scheduleJob(job2, getTrigger6());

    }

    /**
     * The trigger is triggered immediately, then every 2 seconds, 22:55:00:
     */
    private static Trigger getTrigger1() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

        //Define a task trigger
        return newTrigger()
                .withIdentity("job2", "group2")
                //Fixed point triggering
                //.startAt(sdf.parse("2018-09-27 10:27:00"))
                // Five seconds later trigger
                .startAt(DateBuilder.futureDate(5, DateBuilder.IntervalUnit.SECOND))
                .withSchedule(simpleSchedule()
                        .withIntervalInSeconds(2)
                        .repeatForever())
                //.withRepeatCount(0))
                .endAt(DateBuilder.dateOf(22, 55, 0))
                .build();
    }

Running the test class, the results are as follows: (Congratulations, success, then, in-depth study)

10:29:11.012 [MyOneQuartzScheduler_Worker-1] DEBUG org.quartz.core.JobRunShell - Calling execute on job DEFAULT.6da64b5bd2ee-f1562ba3-b8fa-436d-848e-d6e8ea39c26d
name : Zhang San
characteristic : Handsome 3

Source address

github address<br/>

Reference document

quartz Chinese Document<br>