cron表达式

cron表达式格式：

{秒数} {分钟} {小时} {日期} {月份} {星期} {年份(可为空)}

* 表示所有值

? 表示未说明值,即不关心何值

L 表示每月最后一天

/ 表示每次递增的值

- 表示一个指定的范围

在线cron表达式生成器

依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-quartz</artifactId>
        </dependency>

定义一个定时任务

package com.example.demo.job;

import org.quartz.*;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author : sheep669
 * @description : TODO
 * @created at 2022/10/5 10:19
 */
public class HelloJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        JobDetail jobDetail = jobExecutionContext.getJobDetail();
        JobDataMap jobDataMap = jobDetail.getJobDataMap();
        SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss E");
        System.out.println(jobDataMap.get("depart") + "----" + jobDataMap.get("username") + "现在时间是:" + time.format(new Date()));
    }
}

定义触发器

package com.example.demo.trigger;

import com.example.demo.job.HelloJob;
import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;

/**
 * @author : sheep669
 * @description : TODO
 * @created at 2022/10/5 10:28
 */
public class TriggerRunner {
    public static void main(String[] args) throws SchedulerException {
        JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                .withIdentity("myJob", "group1")
                .usingJobData("username", "张三")
                .build();
        JobDataMap jobDataMap = jobDetail.getJobDataMap();
        jobDataMap.put("depart", "销售部");


        SimpleTrigger trigger = TriggerBuilder.newTrigger()
                .withIdentity("myTrigger", "group1")
                .startNow()
                .withSchedule(SimpleScheduleBuilder.simpleSchedule()
                        //执行一次
                        .withIntervalInSeconds(2).withRepeatCount(0))
                .build();

        StdSchedulerFactory stdSchedulerFactory = new StdSchedulerFactory();
        Scheduler scheduler = stdSchedulerFactory.getScheduler();
        scheduler.scheduleJob(jobDetail, trigger);
        scheduler.start();
    }
}

启动主方法即可