Quartz：扩兹初级实验定时器--任务调度

pom.xml:依赖 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.sw.quartz</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demo</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!--quartz依赖-->
		<dependency>
			<groupId>org.quartz-scheduler</groupId>
			<artifactId>quartz</artifactId>
			<version>2.2.1</version>
		</dependency>
		<dependency>
			<groupId>org.quartz-scheduler</groupId>
			<artifactId>quartz-jobs</artifactId>
			<version>2.2.1</version>
		</dependency>


	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

创建工作任务：

package com.sw.quartz.demo.quartz;

import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

import java.util.Date;

public class MyJob implements Job{
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        JobDataMap jobDataMap=jobExecutionContext.getMergedJobDataMap();
        System.out.println(jobDataMap.get("uname"));
        System.out.println("任务运行中" + new Date().toLocaleString());
    }
}

 创建定时的触发

package com.sw.quartz.demo.quartz;


import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;
import org.slf4j.Logger;

import java.util.Date;

public class Demo1 {

    public static void main(String[] args) throws Exception {
        //1.创建Scheduler的工厂
        SchedulerFactory sf = new StdSchedulerFactory();

        //2.从工厂中获取调度器实例
        Scheduler scheduler = sf.getScheduler();


        //3.创建JobDetail(作业信息)
        JobDetail jb = JobBuilder.newJob(MyJob.class)
                .withDescription("this is a ram job") //job的描述
                .withIdentity("ramJob", "ramGroup") //job 的name和group
                .build();


        //向任务传递数据
        JobDataMap jobDataMap = jb.getJobDataMap();
        jobDataMap.put("uname", "张三");

        //任务运行的时间，SimpleSchedle类型触发器有效
        long time = System.currentTimeMillis() + 3 * 1000L; //3秒后启动任务
        Date statTime = new Date(time);

        //4.创建Trigger
        //使用SimpleScheduleBuilder或者CronScheduleBuilder
        Trigger t = TriggerBuilder.newTrigger()
                .withDescription("")
                .withIdentity("ramTrigger", "ramTriggerGroup")
                .startAt(statTime)  //默认当前时间启动
                //.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(3).withRepeatCount(3))//间隔3秒，重复3次
                .withSchedule(CronScheduleBuilder.cronSchedule("0/3 * * * * ?")) //3秒执行一次
                .build();

        //5.注册任务和定时器
        scheduler.scheduleJob(jb, t);

        //6.启动 调度器
        scheduler.start();

    }
}

启动：

package com.sw.quartz.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
}

常用的是循环的simpleSchedule或表达式cronSchedule

cron：秒 分 时 日 月 周 年

cron在线定制：cron

cron详解：详解

曾在此上吃过大亏，谨记！