Quartz Java Scheduler Guide

To use Quartz in Java, you need to first import the Quartz dependencies, then create a Scheduler object, and use the Scheduler object to create tasks and triggers, and associate them together.

Here is a simple example:

1. Add the Quartz dependency package.

<dependency>
    <groupId>org.quartz-scheduler</groupId>
    <artifactId>quartz</artifactId>
    <version>2.3.2</version>
</dependency>

1. Create a task class that implements the Job interface and execute method, in which you write the necessary logic for the task to be executed.

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class MyJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        System.out.println("Hello, Quartz!");
    }
}

1. Create a Trigger object and specify the time rule for when the task should be executed.

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.CronScheduleBuilder;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.impl.StdSchedulerFactory;

public class Main {
    public static void main(String[] args) {
        try {
            // 创建任务
            JobDetail job = JobBuilder.newJob(MyJob.class)
                .withIdentity("myJob")
                .build();

            // 创建触发器，每隔一秒执行一次
            Trigger trigger = TriggerBuilder.newTrigger()
                .withIdentity("myTrigger")
                .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1).repeatForever())
                .build();

            // 创建调度器
            SchedulerFactory schedulerFactory = new StdSchedulerFactory();
            Scheduler scheduler = schedulerFactory.getScheduler();
            scheduler.start();

            // 将任务和触发器关联起来
            scheduler.scheduleJob(job, trigger);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

With the code above, we have created a simple Quartz application that executes a task to print “Hello, Quartz!” every second. You can adjust the task’s execution time and logic according to your own needs.