SpringBoot项目中怎么使用@Scheduled读取动态参数

本篇内容主要讲解"SpringBoot项目中怎么使用@Scheduled读取动态参数"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"SpringBoot项目中怎么使用@Scheduled读取动态参数"吧!

使用@Scheduled读取动态参数

1、基于@Scheduled可配置开发

application.propertites： read.timer.parmas=0 0/1 * * * *

定时类：

@Componentpublic class ScheduledService {Logger logger= LoggerFactory.getLogger(ScheduledService.class);    @Scheduled(cron = "${read.timer.parmas}")    public void readConfigTable(){        logger.info("*****.read.timer.parmas");    }}

启动类：

@SpringBootApplication@EnableScheduling  //必须public class DataApplication {  public static void main(String[] args) {        SpringApplication.run(DataApplication.class,args);    }}

2、基于代码实现

（1）核心代码

@Component@EnableSchedulingpublic class TestScheduledParams implements SchedulingConfigurer{    Logger logger= LoggerFactory.getLogger(TestScheduledParams.class);     public static  String DEFAULT_CORN="0/3 * * * * *";    //##动态传参要给默认值。    public static String corn=DEFAULT_CORN;     @Override    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {             taskRegistrar.addTriggerTask(new Runnable() {            @Override            public void run() {               // logger.info("定时任务逻辑");            }        }, new Trigger() {            @Override            public Date nextExecutionTime(TriggerContext triggerContext) {                //任务触发，可修改任务的执行周期                CronTrigger cronTrigger = new CronTrigger(corn);                 Date date = cronTrigger.nextExecutionTime(triggerContext);                return date;            }        });    }}

（2）其他类或方法动态传参赋值

TestScheduledParams.corn="0/20 * * * * *"

spring boot Scheduled动态配置

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@Log4j2public 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;    }}

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