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Implementation code of scheduled task scheduling in springboot

Sep 26, 2018 pm 02:23 PM
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);
    }
}
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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()));
    }
}
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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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