Spring boot scheduled tasks example 2016-06-17 22:12

In this page I will show you how to use scheduling tasks with Spring Boot. As we all known there is no config file in Spring Boot. We use annotations to config scheduling tasks. This example also works well in Spring.

project structure

├─main
│  ├─java
│  │  └─com
│  │      └─henryxi
│  │          └─spring
│  │              └─boot
│  │                  └─scheduling
│  │                      └─tasks
│  │                              Application.java
│  │                              ScheduledTasks.java
│  │
│  └─resources
└─test
    └─java

pom

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>1.3.3.RELEASE</version>
</dependency>

Application

@SpringBootApplication
@EnableScheduling
public class Application {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class);
    }
}

ScheduledTasks

@Component
public class ScheduledTasks {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

    @Scheduled(fixedRate = 5000)
    public void reportTimeEvery5s() {
        System.out.println("Report time every 5s:" + dateFormat.format(new Date()));
    }

    @Scheduled(fixedDelay = 5000)
    public void reportTimeEvery5sAfterLastTaskSuccess() throws InterruptedException {
        System.out.println("Report time every 5s after last task success:" + dateFormat.format(new Date()));
        Thread.sleep(5000L);
    }

    @Scheduled(initialDelay = 10000, fixedRate = 5000)
    public void wait10sReportTime() {
        System.out.println("Wait 10s report time:" + dateFormat.format(new Date()));
    }

    @Scheduled(cron="*/5 * * * * MON-FRI")
    public void reportTimeByCron() {
        System.out.println("Report time by cron:" + dateFormat.format(new Date()));
    }
}

the output of this demo like following

Report time every 5s:10:02:13
Report time every 5s after last task success:10:02:13
Report time every 5s:10:02:18
Wait 10s report time:10:02:23
Report time every 5s:10:02:23
Report time every 5s after last task success:10:02:23
Wait 10s report time:10:02:28
Report time every 5s:10:02:28
Wait 10s report time:10:02:33
Report time every 5s:10:02:33
Report time every 5s after last task success:10:02:33
Wait 10s report time:10:02:38
Report time every 5s:10:02:38
Wait 10s report time:10:02:43
Report time every 5s:10:02:43
Report time every 5s after last task success:10:02:43
Wait 10s report time:10:02:48
Report time every 5s:10:02:48
Wait 10s report time:10:02:53
Report time every 5s:10:02:53
Report time every 5s after last task success:10:02:53
Wait 10s report time:10:02:58
Report time every 5s:10:02:58
Wait 10s report time:10:03:03
Report time every 5s:10:03:03
Report time every 5s after last task success:10:03:03

• @Scheduled(fixedRate = 5000) on reportTimeEvery5s method means this method will executed every 5 seconds.
• @Scheduled(fixedDelay = 5000) on reportTimeEvery5sAfterLastTaskSuccess method means this method will executed after last task execute successfully 5 seconds. if Last task is still running the new task won't executed.
• @Scheduled(initialDelay = 10000, fixedRate = 5000) on wait10sReportTime method means this method will "wait" 10 seconds then begin executing every 5 seconds.
• @Scheduled(cron="*/5 * * * * MON-FRI") on reportTimeByCron method means this method will executed like corn expression described.