SpringBoot实战：定时任务

1. 启动定时任务需在配置类中添加@EnableScheduling注解

@SpringBootApplication
@EnableScheduling //设置定时任务需在相应模块下添加注解@EnableScheduling //并定义类实现定时任务
public class AdminWebApplication {
    public static void main(String[] args) {
        SpringApplication.run(AdminWebApplication.class, args);
    }
}

2. 创建定时任务类

@Component
public class ScheduleTasks {

    /*//设置定时任务
    @Scheduled(cron = "* * * * * *") //*d代表任意，cron表达式设置什么时候执行以下方法，此时为每一秒都要执行
    public void test() {
        System.out.println(new Date());
    }*/

    @Autowired
    private LeaseAgreementService leaseAgreementService;

    @Scheduled(cron = "0 0 0 * * *") //*d代表任意，cron表达式设置什么时候执行以下方法，此时为每天0点整执行
    public void checkLeaseStatus() {
        LambdaUpdateWrapper<LeaseAgreement> updateWrapper = new LambdaUpdateWrapper<>();
        updateWrapper.le(LeaseAgreement::getLeaseEndDate, new Date());
        updateWrapper.in(LeaseAgreement::getStatus, LeaseStatus.SIGNED, LeaseStatus.WITHDRAWING);
        updateWrapper.set(LeaseAgreement::getStatus, LeaseStatus.SIGNED);

        leaseAgreementService.update(updateWrapper);
    }
}

设置任务时长语法如下

  ┌───────────── second (0-59)
  │ ┌───────────── minute (0 - 59)
  │ │ ┌───────────── hour (0 - 23)
  │ │ │ ┌───────────── day of the month (1 - 31)
  │ │ │ │ ┌───────────── month (1 - 12) (or JAN-DEC)
  │ │ │ │ │ ┌───────────── day of the week (0 - 7)
  │ │ │ │ │ │          (0 or 7 is Sunday, or MON-SUN)
  │ │ │ │ │ │
  * * * * * *