【Quartz】一个小Demo

　　Quartz是一个优秀的框架，功能强大，用法简单，比如说下面这个例子。

（1）引入Jar包

<!-- quartz 模块 -->
<dependency>
    <groupId>org.quartz-scheduler</groupId>
    <artifactId>quartz</artifactId>
    <version>2.3.0</version>
</dependency>
<dependency>
    <groupId>org.quartz-scheduler</groupId>
    <artifactId>quartz-jobs</artifactId>
    <version>2.3.0</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
</dependency>

（2）写一个任务（Job）

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

import java.util.Date;

public class TimeJob implements Job {

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        System.out.println("Now is " + new Date());
    }
}

（3）写执行类

import org.quartz.*;

import static org.quartz.JobBuilder.newJob;
import static org.quartz.SimpleScheduleBuilder.simpleSchedule;
import static org.quartz.TriggerBuilder.newTrigger;

public class QuartzDemo {
    public static void main(String[] args) throws SchedulerException {
        SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();

        Scheduler sched = schedFact.getScheduler();

        sched.start();

        // define the job and tie it to our HelloJob class
        JobDetail job = newJob(TimeJob.class)
                .withIdentity("myJob", "group1")
                .build();

        // Trigger the job to run now, and then every 5 seconds
        Trigger trigger = newTrigger()
                .withIdentity("myTrigger", "group1")
                .startNow()
                .withSchedule(simpleSchedule()
                        .withIntervalInSeconds(5)
                        .repeatForever())
                .build();

        // Tell quartz to schedule the job using our trigger
        sched.scheduleJob(job, trigger);
    }
}