SpringBoot定时任务

首先需要在启动类上加@EnableScheduling注解

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

其次编写定时任务

@Component
public class MyScheduleTask {
    private final Logger logger = LoggerFactory.getLogger(MyScheduleTask.class);

    private final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-DD HH:mm:ss");

    //上一次开始执行时间3s后执行
    @Scheduled(fixedRate = 3000)
    public void schedule0(){
        logger.info("schedule0 -> {}", LocalDateTime.now().format(dateTimeFormatter));
    }


    //上一次执行完毕时间3s后执行
    @Scheduled(fixedDelay = 3000)
    public void schedule1(){
        logger.info("schedule1 -> {}", LocalDateTime.now().format(dateTimeFormatter));
    }


    //上一次执行完毕时间3s后执行(会把执行方法的时间也包含进来)
    @Scheduled(fixedDelay = 3000)
    public void schedule2(){
        logger.info("schedule2 -> {}", LocalDateTime.now().format(dateTimeFormatter));
    }


    //第一次延迟2s后执行，之后按照每3s执行一次
    @Scheduled(initialDelay = 2000, fixedDelay = 3000)
    public void schedule3(){
        logger.info("schedule3 -> {}", LocalDateTime.now().format(dateTimeFormatter));
    }


    //每3s执行一次，详细语法请参照cron
    @Scheduled(cron = "*/3 * * * * ?")
    public void schedule4(){
        logger.info("schedule4 -> {}", LocalDateTime.now().format(dateTimeFormatter));
    }
}