Quartz(2)：JobDetail、JobExectionContext、JobDataMap的介绍

/**
 * 需要实现Job接口
 */
public class HelloJob implements Job {

    //Job实现类中添加setter方法对应的JobDataMap的键值,JobFactory实现类在初始化job实例对象时会自动调用这些setter方法
    private Integer account;
    private String name;

    public void setAccount(Integer account) {
        this.account = account;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime time = LocalDateTime.now();
        String localTime = df.format(time);
        System.out.println("数据库备份时间:"+localTime);

        JobKey key = jobExecutionContext.getJobDetail().getKey();

        //通过JobExecutionContext类，我们可以在任务执行时获取Job本身的一些信息
        System.out.println("任务:"+key.getGroup()+":"+key.getName());  //获取任务组和任务名称
        System.out.println(jobExecutionContext.getJobDetail().getJobClass()); //获取Job的Class

        //获取任务数据的参数值
        JobDataMap dataMap = jobExecutionContext.getJobDetail().getJobDataMap();
        dataMap.forEach((x,y)-> System.out.println(x+":"+y));

        //Trigger和JobDetail类似,也可以传递dataMap(TriggerDataMap)
        //但是，如果遇到同名的key，trigger中的usingJobData会覆盖JobDetail中的usingJobData
        TriggerKey triggerKey = jobExecutionContext.getTrigger().getKey();
        System.out.println("触发器:"+triggerKey.getGroup()+":"+triggerKey.getName());

        //当前任务的执行时间
        System.out.println("当前任务执行时间:"+jobExecutionContext.getFireTime());

        //当前类的成员变量值
        System.out.println("成员变量:"+account+":"+name);
    }
}

public static void main(String[] args) throws SchedulerException {
        //调度器(Scheduler)
        //从工厂中获取
        Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

        //任务数据
        JobDataMap map = new JobDataMap();
        map.put("account",123456);
        map.put("name","张三");

        //任务实例(JobDetail)
        JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                .withIdentity("job1", "group1")  //参数一：任务名称 参数二：任务组
                .usingJobData(map)  //传递JobDataMap
                .build();

        //触发器(Trigger)
        SimpleTrigger trigger = TriggerBuilder.newTrigger()
                .withIdentity("trigger1", "group1")
                .startNow()//立即启用
                .withSchedule(SimpleScheduleBuilder.repeatSecondlyForever(5))  //每5秒执行一次
                .build();
        //关联触发器和任务  按照触发器的条件执行任务
        scheduler.scheduleJob(jobDetail,trigger);
        //启动
        scheduler.start();
    }