什么是Trigger？

Quartz中的觸發(fā)器用來(lái)告訴調(diào)度程序作業(yè)什么時(shí)候觸發(fā)。即Trigger對(duì)象是用來(lái)觸發(fā)Job的

JobKey表示Job實(shí)例的標(biāo)識(shí)，觸發(fā)器被觸發(fā)時(shí)，該指定的Job實(shí)例會(huì)執(zhí)行。
StartTime 表示觸發(fā)器的時(shí)間表首次被觸發(fā)的時(shí)間。它的值的類型是Java.util.Date
EndTime 指定觸發(fā)器的不再被觸發(fā)的時(shí)間。它的值的類型是Java.util.Date

具體案例

import java.text.SimpleDateFormat;
import java.util.Date;

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;

public class HelloScheduler {
    
    public static void main(String[] args) throws SchedulerException {
        //打印當(dāng)前的執(zhí)行時(shí)間
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String currentTime = sdf.format(date);
        System.out.println("Current Time : "+currentTime);
        //獲取當(dāng)前時(shí)間3秒后的時(shí)間
        date.setTime(date.getTime()+3000);
        //獲取距離當(dāng)前時(shí)間6秒后的時(shí)間
        Date endDate = new Date();
        endDate.setTime(endDate.getTime()+6000);
        //創(chuàng)建一個(gè)JobDetail實(shí)例，將該實(shí)例與HelloJob class綁定
        JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                .withIdentity("myJob", "group1")
                .build();
        //創(chuàng)建一個(gè)Trigger實(shí)例，定義該Job立即執(zhí)行，并且每隔2秒鐘重復(fù)執(zhí)行一次，直到永遠(yuǎn)
        Trigger trigger = TriggerBuilder.newTrigger()
                .withIdentity("myTrigger", "group1")
                .startAt(date)
                .endAt(endDate)
                .withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(2).repeatForever())
                .build();
        //創(chuàng)建Scheduler實(shí)例
        SchedulerFactory sfact = new StdSchedulerFactory();
        Scheduler scheduler = sfact.getScheduler();
        scheduler.start();
        scheduler.scheduleJob(jobDetail, trigger);
    }

}

import java.text.SimpleDateFormat;
import java.util.Date;

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


public class HelloJob implements Job{
    
    public void execute(JobExecutionContext context) throws JobExecutionException {        
        
        //打印當(dāng)前的執(zhí)行時(shí)間
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String currentTime = sdf.format(date);
        System.out.println("Current Exec Time : "+currentTime);
        //編寫(xiě)具體的業(yè)務(wù)邏輯        
        Trigger currentTrigger = context.getTrigger();
        System.out.println("Start Time is:"+sdf.format(currentTrigger.getStartTime()));
        System.out.println("End Time is:"+sdf.format(currentTrigger.getEndTime()));
        JobKey jobKey = currentTrigger.getJobKey();
        System.out.println("JobKey info --" +jobKey.getName()+": "+jobKey.getGroup()+": "+jobKey.getClass());
    }

}

總結(jié)

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