JobDataMap 更新_04

第2篇讲述了怎样给job传递参数或者随机数，但是，这个随机数不会更新，举个例子，执行第一次job的时 随机数3 ，执行第2次job，随机数仍然是3，因为执行每一次job都会实例化job实例对象

JobDataMap更新的使用场景：
举个例子，执行第一次job的时随机数3 ，间隔5秒，执行第2次job，随机数仍然是3+5-8
使用@PersistJobDataAfterExecution可更新JobDataMap
JobDataMap更新示例

代码示例：

package com.gblfy;

import com.gblfy.job.MyJob;
import org.quartz.*;
import org.quartz.impl.StdSchedulerFactory;

import java.util.Random;

public class QuartzStart {

    public static void main(String[] args) throws SchedulerException {
        //创建Scheduler
        Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
        scheduler.start();

        Random random = new Random();
        int count = random.nextInt(10);

        //创建JobDetail
        JobDetail jobDetail = JobBuilder.newJob(MyJob.class)
                //唯一标识
                .withIdentity("jobDetail1", "group1")
                //添加参数通过usingJobData方法，传递给job
                .usingJobData("count",count)
                .build();

        //创建Trigger
        Trigger trigger = TriggerBuilder.newTrigger()
                //立即执行
                .startNow()
                //任务周期
                .withSchedule(SimpleScheduleBuilder.simpleSchedule()
                    //间隔周期 单位s
                    .withIntervalInSeconds(5)
                    //一直执行
                    .repeatForever())
                .build();

        //把jobDetail和trigger注册到scheduler中
        scheduler.scheduleJob(jobDetail, trigger);
        try {
            Thread.sleep(60000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        scheduler.shutdown();
    }
}

job

package com.gblfy.job;

import lombok.Getter;
import lombok.Setter;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.PersistJobDataAfterExecution;

import java.time.LocalTime;

@PersistJobDataAfterExecution
public class MyJob implements Job {

    @Getter@Setter
    private int count;

    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        LocalTime localTime = LocalTime.now();
        count++;
        context.getJobDetail().getJobDataMap().put("count",count);
        System.out.println(localTime.toString() + "----count的值=" + count);
    }
}