SpringBoot scheduling tasks and common task expressions

This article mainly introduces SpringBoot scheduling tasks and common task expressions. 1. First, you need to annotate *applicatin.java with @EnableScheduling to detect whether there are scheduled tasks. 2. The @Scheduled annotation is used to mark this method as a scheduled task method. Spring will automatically scan this annotation and start the scheduling task.

package com.david.translate.quartz;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.david.translate.service.SysUserService;
@Component
public class TimeQuartz {
  @Autowired
  private SysUserService userService;
  /**
   * 一分钟执行一次
   */
  @Scheduled(cron="0 0/1 * * * ?") 
  public void executeFileDownLoadTask() {
    System.out.println(">>>>>>>>>>>>>>>>>>>任务执行 "+userService.findAll().size());
  }
}

The time configuration of scheduling tasks uses cron expressions. I recommend a website that generates expressions online. If you don’t know how to write or are unwilling to write it yourself, , can be generated directly using this website:

http://cron.qqe2.com/

The screenshot is as follows:

Some commonly used task expression examples:

0 * * * * ? Trigger once every 1 minute
0 0 * * * ? Trigger once every 1 hour every day
0 0 10 * * ? Triggered once every day at 10 o'clock
0 * 14 * * ? Triggered every 1 minute from 2 pm to 2:59 pm every day
0 30 9 1 * ? At 9:30 am on the 1st of every month
0 15 10 15 * ? Triggered at 10:15 am on the 15th of every month

/5 * * * ? Executed every 5 seconds
0 /1 * * ? Executed every 1 minute Once
0 0 5-15 * * ? Trigger on the hour from 5 to 15 o'clock every day
0 0/3 * * * ? Trigger once every three minutes
0 0-5 14 * * ? Every afternoon Trigger every 1 minute from 2pm to 2:05pm
0 0/5 14 * * ? Trigger every 5 minutes from 2pm to 2:55pm every day
0 0/5 14,18 * * ? Trigger every 5 minutes between 2pm and 2:55pm and every 5 minutes between 6pm and 6:55pm
0 0/30 9-17 * * ? Every half hour during 9 to 5 working hours
0 0 10,14,16 * * ? Every day at 10 am, 2 pm, 4 pm

0 0 12 ? * WED means every Wednesday at 12 noon
0 0 17 ? * TUES, THUR, SAT every Tuesday, Thursday, and Saturday at 5 pm
0 10,44 14 ? 3 WED Triggered every Wednesday in March at 2:10 and 2:44 pm
0 15 10 ? * MON -FRI triggers at 10:15 am from Monday to Friday

0 0 23 L * ? Execute once at 23:00 on the last day of each month
0 15 10 L * ? 10:00 am on the last day of each month 15 Trigger
0 15 10 ? * 6L Triggered at 10:15 am on the last Friday of each month

0 15 10 * * ? 2005 Triggered at 10:15 am every day in 2005
0 15 10 ? * 6L 2002-2005 Triggered at 10:15 am on the last Friday of each month from 2002 to 2005
0 15 10 ? * 6#3 Triggered at 10:15 am on the third Friday of each month

The above content is SpringBoot scheduling tasks and common task expressions. I hope it can help everyone.

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