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HomeJavajavaTutorialImplementation code of scheduled task scheduling in springboot

The content of this article is about the implementation code of scheduled task scheduling in springboot. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Springboot integrates Scheduled to facilitate task scheduling. Without further ado, let’s go directly to the code

package com.rookie.bigdata;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
//开启调度任务
@EnableScheduling
public class SpringbootApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }
}

package com.rookie.bigdata.scheduled;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by  on 2018/9/21.
 */
@Component
public class Task {
    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");


    @Scheduled(cron = "0 10-15 16 * * ?")
    public void task0() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));


    }


    /**
     * 指定间隔调度任务,指在该任务完成后的间隔
     */
    @Scheduled(fixedDelay = 5000)
    public void task1() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));
    }


    /**
     * 指定间隔调度任务,参考fixedDelay,单位为毫秒
     */
    @Scheduled(fixedDelayString = "5000")
    public void task2() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));
    }

    /**
     * fixedRate:执行频率,每隔多少时间就启动任务,不管该任务是否启动完成参考fixedRate
     */
    @Scheduled(fixedRate = 5000)
    public void task3() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));
    }

    /**
     * 参考fixedRate
     */
    @Scheduled(fixedDelayString = "5000")
    public void task4() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));
    }

    /**
     * 参考fixedRate
     */
    @Scheduled(fixedRateString = "5000")
    public void task5() {
        System.out.println("执行时间: " + dateFormat.format(new Date()));
    }
}

cron expression

Quartz的cron表达式 
一个cron表达式有至少6个(也可能7个)有空格分隔的时间元素。 
按顺序依次为 
秒(0~59) 
分钟(0~59) 
小时(0~23) 
天(月)(0~31,但是你需要考虑你月的天数) 
月(0~11) 
天(星期)(1~7 1=SUN 或 SUN,MON,TUE,WED,THU,FRI,SAT) 
7.年份(1970-2099) 
其中每个元素可以是一个值(如6),一个连续区间(9-12),一个间隔时间(8-18/4)(/表示每隔4小时),一个列表(1,3,5),通配符。由于"月份中的日期"和"星期中的日期"这两个元素互斥的,必须要对其中一个设置?. 
0 10,14,16 * * ? 每天上午10点,下午2点,4点 
0/30 9-17 * * ?   朝九晚五工作时间内每半小时 
0 12 ? * WED 表示每个星期三中午12点 
"0 0 12 * * ?" 每天中午12点触发 
"0 15 10 ? * *" 每天上午10:15触发 
"0 15 10 * * ?" 每天上午10:15触发 
"0 15 10 * * ? *" 每天上午10:15触发 
"0 15 10 * * ? 2005" 2005年的每天上午10:15触发 
"0 * 14 * * ?" 在每天下午2点到下午2:59期间的每1分钟触发 
"0 0/5 14 * * ?" 在每天下午2点到下午2:55期间的每5分钟触发 
"0 0/5 14,18 * * ?" 在每天下午2点到2:55期间和下午6点到6:55期间的每5分钟触发 
"0 0-5 14 * * ?" 在每天下午2点到下午2:05期间的每1分钟触发 
"0 10,44 14 ? 3 WED" 每年三月的星期三的下午2:10和2:44触发 
"0 15 10 ? * MON-FRI" 周一至周五的上午10:15触发 
"0 15 10 15 * ?" 每月15日上午10:15触发 
"0 15 10 L * ?" 每月最后一日的上午10:15触发 
"0 15 10 ? * 6L" 每月的最后一个星期五上午10:15触发 
"0 15 10 ? * 6L 2002-2005" 2002年至2005年的每月的最后一个星期五上午10:15触发 
"0 15 10 ? * 6#3" 每月的第三个星期五上午10:15触发 
有些子表达式能包含一些范围或列表 
例如:子表达式(天(星期))可以为 “MON-FRI”,“MON,WED,FRI”,“MON-WED,SAT” 
“*”字符代表所有可能的值 
因此,“*”在子表达式(月)里表示每个月的含义,“*”在子表达式(天(星期))表示星期的每一天 
“/”字符用来指定数值的增量 
例如:在子表达式(分钟)里的“0/15”表示从第0分钟开始,每15分钟 
         在子表达式(分钟)里的“3/20”表示从第3分钟开始,每20分钟(它和“3,23,43”)的含义一样 
“?”字符仅被用于天(月)和天(星期)两个子表达式,表示不指定值 
当2个子表达式其中之一被指定了值以后,为了避免冲突,需要将另一个子表达式的值设为“?” 
“L” 字符仅被用于天(月)和天(星期)两个子表达式,它是单词“last”的缩写 
但是它在两个子表达式里的含义是不同的。 
在天(月)子表达式中,“L”表示一个月的最后一天 
在天(星期)自表达式中,“L”表示一个星期的最后一天,也就是SAT 
如果在“L”前有具体的内容,它就具有其他的含义了 
例如:“6L”表示这个月的倒数第6天,“FRIL”表示这个月的最一个星期五 
注意:在使用“L”参数时,不要指定列表或范围,因为这会导致问题 
字段   允许值   允许的特殊字符 
秒    0-59    , - * / 
分    0-59    , - * / 
小时    0-23    , - * / 
日期    1-31    , - * ? / L W C 
月份    1-12 或者 JAN-DEC    , - * / 
星期    1-7 或者 SUN-SAT    , - * ? / L C # 
年(可选)    留空, 1970-2099    , - * /

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