spring boot Scheduled动态配置

版权声明：一家之言，看完就忘了吧 https://blog.csdn.net/leisure_life/article/details/89317923

package cn.com.suntree.cmp.service;

import cn.com.suntree.cmp.utils.CommonUtil;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;

import java.util.Date;

@Component
@Log4j2
public class MyDynamicTask implements SchedulingConfigurer {//实现SchedulingConfigurer 接口

    @Autowired
    CommonUtil commonUtil;

    @Autowired
    TaskService taskService;

    private static String cron;

    @Override
    public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {//重写该方法
        scheduledTaskRegistrar.addTriggerTask(doTask(), getTrigger());
    }
    private Runnable doTask() {
        return new Runnable() {
            @Override
            public void run() {
                log.info("-------------------------------执行"+cron);
                taskService.monDay();//真正需要运行的逻辑代码
            }
        };
    }

    private Trigger getTrigger() {
        return new Trigger() {
            @Override
            public Date nextExecutionTime(TriggerContext triggerContext) {
                // 触发器
                CronTrigger trigger = new CronTrigger(getCron());
                return trigger.nextExecutionTime(triggerContext);
            }
        };
    }

    public String getCron() {
        Jedis jedis = commonUtil.getJedis();
        String newCron =  jedis.get("cron");//可以改成配置到数据库中
        if (StringUtils.isEmpty(newCron)) {
            jedis.set("cron","0 30 0 ? * Mon");
            return "0 30 0 ? * Mon";
        }
        if (!newCron.equals(cron)) {
            log.info(new StringBuffer("Cron has been changed to:'").append(newCron).append("'. Old cron was:'").append(cron).append("'").toString());
            cron = newCron;
        }
        return cron;
    }


}