spring-task定时任务动态配置修改执行时间

原文https://blog.csdn.net/ll840768874/article/details/78507286

import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;
 
import java.text.SimpleDateFormat;
import java.util.Date;
 
/**
 * Created by loup on 2017/11/11.
 */
@Component
@EnableScheduling
public class DynamicScheduledTask implements SchedulingConfigurer {
 
    //时间表达式  每2秒执行一次
    private String cron = "0/2 * * * * ?";
 
    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 
    @Override
    public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
        scheduledTaskRegistrar.addTriggerTask(new Runnable() {
            @Override
            public void run() {
                //任务逻辑
                System.out.println("---------------start-------------------");
                System.out.println("动态修改定时任务参数，时间表达式cron为：" + cron);
                System.out.println("当前时间为：" + sdf.format(new Date()));
                System.out.println("----------------end--------------------");
            }
        }, new Trigger() {
            @Override
            public Date nextExecutionTime(TriggerContext triggerContext) {
                CronTrigger cronTrigger = new CronTrigger(cron);
                Date nextExecDate = cronTrigger.nextExecutionTime(triggerContext);
                return nextExecDate;
            }
        });
    }
 
    public void setCron(String cron) {
        this.cron = cron;
    }
}

这个是定时任务调度执行器，采用的是注解的方式。首先要动态配置，要设置为@EnableScheduling，这是确保能够动态，然后实现SchedulingConfigurer，重写configureTasks方法，接下来就是这个的相关spring配置文件，要引入下面这个task，不然识别不了啊，配置文件就是这么简单

http://www.springframework.org/schema/task

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/task
        http://www.springframework.org/schema/task/spring-task.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
 
    <context:component-scan base-package="com.seckill.quartz"/>
 
    <task:annotation-driven />
 
</beans>

接下来就是写测试类，测试可不可行啊

package com.seckill.quartz;
 
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
import java.io.IOException;
 
/**
 * Created by loup on 2017/11/11.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath*:/conf/spring-quartz.xml"})
public class QuartzTest {
 
    @Autowired
    private DynamicScheduledTask dynamicScheduledTask;
 
    @Test
    public void test1(){
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        dynamicScheduledTask.setCron("0/10 * * * * ?");
        try {
            System.in.read();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

运行测试类，查看结果，达到效果，亲测可用