SpringBoot定时任务的实现详解

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

@SpringBootApplication
@EnableScheduling
public class TestforeverApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestforeverApplication.class, args);
    }
}

@Component
public class MySchedule {
    // 当前任务执行结束1秒后开启另一个任务
    @Scheduled(fixedDelay = 1000)
    public void fixedDelay() {
        System.out.println("fixedDelay："+new Date());
    }
    // 当前任务开始执行2秒后开启另一个定时任务
    @Scheduled(fixedRate = 2000)
    public void fixedRate() {
        System.out.println("fixedRate："+new Date());
    }
    // 当前任务开始执行2秒后开启另一个定时任务，并且首次延迟1秒执行
    @Scheduled(initialDelay = 1000, fixedRate = 2000)
    public void initialDelay() {
        System.out.println("initialDelay："+new Date());
    }
    // 使用crom 表达式，下面表示定时任务每分钟执行一次
    @Scheduled(cron = "0 * * * * ?")
    public void cron() {
        System.out.println("cron："+new Date());
    }
}

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

@Component
public class MyFirstJob {
    public void sayHello() {
        System.out.println("MyFirstJob:sayHello:" + new Date());
    }
}

public class MySecondJob extends QuartzJobBean {
    private String name;

    public void setName(String name) {
        this.name = name;
    }

    @Override
    protected void executeInternal(JobExecutionContext context) {
        System.out.println("hello:" + name + ":" + new Date());
    }
}

@Configuration
public class QuartzConfig {
    /********** 配置两个 JobDetail **********/
    // 通过 MethodInvokingJobDetailFactoryBean 类配置 JobDetail
    @Bean
    MethodInvokingJobDetailFactoryBean jobDetail1() {
        MethodInvokingJobDetailFactoryBean bean =
                new MethodInvokingJobDetailFactoryBean();
        bean.setTargetBeanName("myFirstJob");
        bean.setTargetMethod("sayHello");
        return bean;
    }
    // 通过 JobDetailFactoryBean 来实现 JobDetail
    @Bean
    JobDetailFactoryBean jobDetail2() {
        JobDetailFactoryBean bean = new JobDetailFactoryBean();
        bean.setJobClass(MySecondJob.class);
        JobDataMap jobDataMap = new JobDataMap();
        jobDataMap.put("name","sang");
        bean.setJobDataMap(jobDataMap);
        bean.setDurability(true);
        return bean;
    }
    /********** 创建两个 Trigger **********/
    // 创建一个 SimpleTrigger
    @Bean
    SimpleTriggerFactoryBean simpleTrigger() {
        SimpleTriggerFactoryBean bean = new SimpleTriggerFactoryBean();
        bean.setJobDetail(jobDetail1().getObject()); // 设置 jobDetail
        bean.setRepeatCount(3); // 任务循环次数为3（总共会执行4次）
        bean.setStartDelay(2000); // 任务启动延迟2秒执行
        bean.setRepeatInterval(2000);  // 任务的时间间隔为2秒
        return bean;
    }
    // 创建一个 CronTrigger
    @Bean
    CronTriggerFactoryBean cronTrigger() {
        CronTriggerFactoryBean bean = new CronTriggerFactoryBean();
        bean.setJobDetail(jobDetail2().getObject()); // 设置 jobDetail
        bean.setCronExpression("* * * * * ?"); // 设置 Cron 表达式
        return bean;
    }
    /********** 创建 SchedulerFactory **********/
    @Bean
    SchedulerFactoryBean schedulerFactory() {
        // 通过 SchedulerFactoryBean 创建 SchedulerFactor
        SchedulerFactoryBean bean = new SchedulerFactoryBean();
        // 配置两个 Trigger
        SimpleTrigger simpleTrigger = simpleTrigger().getObject();
        CronTrigger cronTrigger = cronTrigger().getObject();
        bean.setTriggers(simpleTrigger,cronTrigger);
        return bean;
    }
}