定时任务简单实现

Spring3.0之后自带的定时器类

Spring boot 启动类添加

 @EnableScheduling // 开启定时任务

编写cron定时类

@Component
public class CronUtils {
//    cron：cron表达式十分强大，可以指定秒、分、时、日期、月份、星期几，年,格式为 * * * * * ？

    // 10秒执行一次
//    @Scheduled(cron = "*/10 * * * * ?")
    public void doTask() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        System.out.println("我是定时任务~" + sdf.format(new Date()));
    }
}

   
        
            org.quartz-scheduler
            quartz
            2.3.0
        

编写任务类实现Job接口

public class HelloJob implements Job {
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        //编写具体的业务逻辑
        //打印当前的执行时间，格式为：2017-09-06 00:00:00
        Date date = new Date();
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println("当前的时间为(HelloJob)：" + sf.format(date));

    }
}

编写调度类

 public class HelloScheduler {
    public static void main(String[] args) throws SchedulerException, InterruptedException {
        // 1、创建调度器Scheduler
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        Scheduler scheduler = schedulerFactory.getScheduler();
        // 2、创建JobDetail实例，并与PrintWordsJob类绑定(Job执行内容)
        JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                .withIdentity("job1", "group1").build();
        // 3、构建Trigger实例,每隔1s执行一次
        Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger1", "triggerGroup1")
                .startNow()//立即生效
                .withSchedule(SimpleScheduleBuilder.simpleSchedule()
                        .withIntervalInSeconds(1)//每隔1s执行一次
                        .repeatForever()).build();//一直执行

        //4、执行
        scheduler.scheduleJob(jobDetail, trigger);
        System.out.println("--------scheduler start ! ------------");
        scheduler.start();

        //睡眠
        TimeUnit.MINUTES.sleep(5);
        scheduler.shutdown();
        System.out.println("--------scheduler shutdown ! ------------");

    }
}