timed task corn

corn表达式

语法：秒 分 时 日 月 周 年（Spring 不支持）
http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.htm

生成工具
https://www.toolscat.com/

特殊字符：
,：枚举;
(cron=“7,9,23 * * * * ?”)：任意时刻的 7,9,23 秒启动这个任务;
-：范围：
(cron=“7-20 * * * * ?”):任意时刻的 7-20 秒之间,每秒启动一次
：任意;
指定位置的任意时刻都可以
/：步长;
(cron=“7/5 * * * * ?”)：第 7 秒启动,每 5 秒一次;
(cron="/5 * * * * ?“)：任意秒启动,每 5 秒一次;
？：（出现在日和周几的位置）：为了防止日和周冲突,在周和日上如果要写通配符使用?
(cron=”* * * 1 * ?“)：每月的 1 号,启动这个任务;
L：（出现在日和周的位置）”,
last：最后一个
(cron=”* * * ? * 3L")：每月的最后一个周二
W：
Work Day：工作日
(cron=“* * * W * ?”)：每个月的工作日触发
(cron=“* * * LW * ?”)：每个月的最后一个工作日触发
#：第几个
(cron=“* * * ? * 5#2”)：每个月的第 2 个周

示例

Expression*	Meaning
0 0 12 * * ?	Fire at 12pm (noon) every day
0 15 10 ? * *	Fire at 10:15am every day
0 15 10 * * ?	Fire at 10:15am every day
0 15 10 * * ? *	Fire at 10:15am every day
0 15 10 * * ?2005	Fire at 10:15am every day during the year 2005
0 * 14 * * ?	Fire every minute starting at 2pm and ending at 2:59pm, every day
0 0/5 14 * * ?	Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day
0 0/5 14,18 * * ?	Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day
0 0-5 14 * * ?	Fire every minute starting at 2pm and ending at 2:05pm, every day
0 10,44 14 ? 3 WED	Fire at 2:10pm and at 2:44pm every Wednesdayin the month of March.
0 15 10 ? * MON-FRI	Fire at 10:15am every Monday, Tuesday, Wednesday, Thursday and Friday
0 15 10 15 * ?	Fire at 10:15am on the 15th day of every month
0 15 10 L * ?	Fire at 10:15am on the last day of every month
0 15 10 L-2 * ?	Fire at 10:15am on the 2nd-to-last last day of every month
0 15 10 ? * 6L	Fire at 10:15am on the last Friday of every month
0 15 10 ? * 6L	Fire at 10:15am on the last Friday of every month
0 15 10 ? * 6L 2002-2005	Fire at 10:15am on every last friday of every month during the years 2002, 2003, 2004 and 2005
0 15 10 ? * 6#3	Fire at 10:15am on the third Friday of every month
0 0 12 1/5 * ?	Fire at 12pm (noon) every 5 days every month, starting on the first day of the month.
0 11 11 11 11 ?	Fire every November 11th at 11:11am

使用

package com.jhj.gulimall.ssoclient.scheduled;


import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;


@Component
@EnableScheduling //开启定时任务

@EnableAsync //开启异步
public class HelloSchedule {
    

    //与cron的区别
    //spring 只允许6位 Years not allowed
    // 在周几的位置 1-7表示周一到周日 ：MON-SUN

    /** *定时任务不应该阻塞 默认是阻塞的 *以异步方式执行 *支持定时任务线程池 配置 spring.task.scheduling.pool.size=5 不太好用 * Let the timed task join the thread 在类上使用@EnableAsync 在方法上使用@Async **/
    @Async
    @Scheduled(cron = "* * * * * ?")
    public void Hello(){
    
        System.out.println("hello");
    }
}

作者声明

如有问题,欢迎指正！