SpringQuartz快速入门

SpringQuartz

一、什么是SpringQuartz

• Quartz是启动定时任务的框架，可以帮助我们在特定的时间执行对应的程序，比如定时发送邮件等

二、快速开始

1. 引入依赖

		<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.kuaishou.rao</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

2. 创建抽象类，创建抽象类的作用是可以让所有的定时任务都遵循一个规范

public abstract class AbstractJob extends QuartzJobBean {

    public abstract String getCron();
    public abstract String getName();
    public abstract Class<? extends Job> getJobClass();
    public String getGroup() {
        return "TEST_GROUP";
    }

    public abstract Trigger getTrigger() throws ParseException;
    public Trigger getDefaultTrigger() throws ParseException {
        CronTriggerFactoryBean triggerFactoryBean = new CronTriggerFactoryBean();
        //cron表达式
        triggerFactoryBean.setCronExpression(getCron());
        triggerFactoryBean.setName(getName());
        triggerFactoryBean.setGroup(getGroup());
        triggerFactoryBean.setJobDetail(getJobDetail());
        //如果错过了这个执行周期，所有的misFire都不管，执行下一个周期的任务。
        triggerFactoryBean.setMisfireInstruction(CronTrigger.MISFIRE_INSTRUCTION_DO_NOTHING);
        //在上述所有的bean都设置成功之后再执行下面的操作
        triggerFactoryBean.afterPropertiesSet();
        return triggerFactoryBean.getObject();
    }

    public abstract JobDetail getJobDetail();
    public JobDetail getDefaultJobDetail() {
        JobDetailFactoryBean detailFactoryBean = new JobDetailFactoryBean();
        detailFactoryBean.setJobClass(getJobClass());
        detailFactoryBean.setName(getName());
        detailFactoryBean.setGroup(getGroup());
        //之前的没有执行的任务将在服务重启后补执行
        detailFactoryBean.setRequestsRecovery(true);
        //把执行结果持久化到数据库
        detailFactoryBean.setDurability(true);
        detailFactoryBean.afterPropertiesSet();
        return detailFactoryBean.getObject();
    }
}

3. 创建测试类，继承抽象类

@Configuration
public class TestJob extends AbstractJob{
    @Override
    public String getCron() {
        return "1-59 * * * * ? *";
    }

    @Override
    public String getName() {
        return "TestJob";
    }

    @Override
    public Class<? extends Job> getJobClass() {
        return TestJob.class;
    }

    @Override
    @Bean("TestJobTrigger")
    public Trigger getTrigger() throws ParseException {
        return getDefaultTrigger();
    }

    @Override
    @Bean("TestJobDetail")
    public JobDetail getJobDetail() {
        return getDefaultJobDetail();
    }

    @Override
    protected void executeInternal(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        System.out.println("hello world");
    }
}

三、运行结果

• 启动工程之后，在控制台每秒打印一次hello world

2020-06-05 11:21:24.672  INFO 1464 --- [           main] org.quartz.impl.StdSchedulerFactory      : Quartz scheduler 'quartzScheduler' initialized from an externally provided properties instance.
2020-06-05 11:21:24.672  INFO 1464 --- [           main] org.quartz.impl.StdSchedulerFactory      : Quartz scheduler version: 2.3.2
2020-06-05 11:21:24.672  INFO 1464 --- [           main] org.quartz.core.QuartzScheduler          : JobFactory set to: org.springframework.scheduling.quartz.SpringBeanJobFactory@5a5c128
2020-06-05 11:21:24.696  INFO 1464 --- [           main] o.s.s.quartz.SchedulerFactoryBean        : Starting Quartz Scheduler now
2020-06-05 11:21:24.696  INFO 1464 --- [           main] org.quartz.core.QuartzScheduler          : Scheduler quartzScheduler_$_NON_CLUSTERED started.
hello world
2020-06-05 11:21:24.732  INFO 1464 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-06-05 11:21:24.735  INFO 1464 --- [           main] com.kuaishou.rao.demo.DemoApplication    : Started DemoApplication in 1.414 seconds (JVM running for 2.062)
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world