Java implements scheduled tasks Schedule

import java.util.Calendar;  
import java.util.Date;  
import java.util.Timer;  
import java.util.TimerTask;  
  
public class Test {  
    public static void main(String[] args) {  
        //timer1();  
        timer2();  
        //timer3();  
        //timer4();  
    }  
  
    // 第一种方法：设定指定任务task在指定时间time执行 schedule(TimerTask task, Date time)  
    public static void timer1() {  
        Timer timer = new Timer();  
        timer.schedule(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 2000);// 设定指定的时间time,此处为2000毫秒  
    }  
  
    // 第二种方法：设定指定任务task在指定延迟delay后进行固定延迟peroid的执行  
    // schedule(TimerTask task, long delay, long period)  
    public static void timer2() {  
        Timer timer = new Timer();  
        timer.schedule(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 1000, 1000);  
    }  
  
    // 第三种方法：设定指定任务task在指定延迟delay后进行固定频率peroid的执行。  
    // scheduleAtFixedRate(TimerTask task, long delay, long period)  
    public static void timer3() {  
        Timer timer = new Timer();  
        timer.scheduleAtFixedRate(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, 1000, 2000);  
    }  
     
    // 第四种方法：安排指定的任务task在指定的时间firstTime开始进行重复的固定速率period执行．  
    // Timer.scheduleAtFixedRate(TimerTask task,Date firstTime,long period)  
    public static void timer4() {  
        Calendar calendar = Calendar.getInstance();  
        calendar.set(Calendar.HOUR_OF_DAY, 12); // 控制时  
        calendar.set(Calendar.MINUTE, 0);       // 控制分  
        calendar.set(Calendar.SECOND, 0);       // 控制秒  
  
        Date time = calendar.getTime();         // 得出执行任务的时间,此处为今天的12：00：00  
  
        Timer timer = new Timer();  
        timer.scheduleAtFixedRate(new TimerTask() {  
            public void run() {  
                System.out.println("-------设定要指定任务--------");  
            }  
        }, time, 1000 * 60 * 60 * 24);// 这里设定将延时每天固定执行  
    }  
}

/**  
 * 普通thread  
 * 这是最常见的，创建一个thread，然后让它在while循环里一直运行着，  
 * 通过sleep方法来达到定时任务的效果。这样可以快速简单的实现，代码如下：  
 * @author GT  
 *  
 */    
public class Task1 {    
    public static void main(String[] args) {    
        // run in a second    
        final long timeInterval = 1000;    
        Runnable runnable = new Runnable() {    
            public void run() {    
                while (true) {    
                    // ------- code for task to run    
                    System.out.println("Hello !!");    
                    // ------- ends here    
                    try {    
                        Thread.sleep(timeInterval);    
                    } catch (InterruptedException e) {    
                        e.printStackTrace();    
                    }    
                }    
            }    
        };    
        Thread thread = new Thread(runnable);    
        thread.start();    
    }    
}

import java.util.concurrent.Executors;    
import java.util.concurrent.ScheduledExecutorService;    
import java.util.concurrent.TimeUnit;    
    
/**  
 *   
 *   
 * ScheduledExecutorService是从Java SE5的java.util.concurrent里，做为并发工具类被引进的，这是最理想的定时任务实现方式。   
 * 相比于上两个方法，它有以下好处：  
 * 1>相比于Timer的单线程，它是通过线程池的方式来执行任务的   
 * 2>可以很灵活的去设定第一次执行任务delay时间  
 * 3>提供了良好的约定，以便设定执行的时间间隔  
 *   
 * 下面是实现代码，我们通过ScheduledExecutorService#scheduleAtFixedRate展示这个例子，通过代码里参数的控制，首次执行加了delay时间。  
 *   
 *   
 * @author GT  
 *   
 */    
public class Task3 {    
    public static void main(String[] args) {    
        Runnable runnable = new Runnable() {    
            public void run() {    
                // task to run goes here    
                System.out.println("Hello !!");    
            }    
        };    
        ScheduledExecutorService service = Executors    
                .newSingleThreadScheduledExecutor();    
        // 第二个参数为首次执行的延时时间，第三个参数为定时执行的间隔时间    
        service.scheduleAtFixedRate(runnable, 10, 1, TimeUnit.SECONDS);    
    }    
}

import java.text.ParseException;    
    
import org.quartz.CronTrigger;    
import org.quartz.JobDetail;    
import org.quartz.Scheduler;    
import org.quartz.SchedulerException;    
import org.quartz.SchedulerFactory;    
import org.quartz.impl.StdSchedulerFactory;    
    
/**  
 * 定时任务管理类  
 *  
 */    
public class QuartzManager {    
    private static SchedulerFactory gSchedulerFactory = new StdSchedulerFactory();    
    private static String JOB_GROUP_NAME = "EXTJWEB_JOBGROUP_NAME";    
    private static String TRIGGER_GROUP_NAME = "EXTJWEB_TRIGGERGROUP_NAME";    
    
    /**  
     * 添加一个定时任务，使用默认的任务组名，触发器名，触发器组名  
     *  
     * @param jobName  
     *            任务名  
     * @param jobClass  
     *            任务  
     * @param time  
     *            时间设置，参考quartz说明文档  
     * @throws SchedulerException  
     * @throws ParseException  
     */    
    public static void addJob(String jobName, String jobClass, String time) {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            JobDetail jobDetail = new JobDetail(jobName, JOB_GROUP_NAME, Class.forName(jobClass));// 任务名，任务组，任务执行类    
            // 触发器    
            CronTrigger trigger = new CronTrigger(jobName, TRIGGER_GROUP_NAME);// 触发器名,触发器组    
            trigger.setCronExpression(time);// 触发器时间设定    
            sched.scheduleJob(jobDetail, trigger);    
            // 启动    
            if (!sched.isShutdown()){    
                sched.start();    
            }    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 添加一个定时任务  
     *  
     * @param jobName  
     *            任务名  
     * @param jobGroupName  
     *            任务组名  
     * @param triggerName  
     *            触发器名  
     * @param triggerGroupName  
     *            触发器组名  
     * @param jobClass  
     *            任务  
     * @param time  
     *            时间设置，参考quartz说明文档  
     * @throws SchedulerException  
     * @throws ParseException  
     */    
    public static void addJob(String jobName, String jobGroupName,    
            String triggerName, String triggerGroupName, String jobClass, String time){    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            JobDetail jobDetail = new JobDetail(jobName, jobGroupName, Class.forName(jobClass));// 任务名，任务组，任务执行类    
            // 触发器    
            CronTrigger trigger = new CronTrigger(triggerName, triggerGroupName);// 触发器名,触发器组    
            trigger.setCronExpression(time);// 触发器时间设定    
            sched.scheduleJob(jobDetail, trigger);    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 修改一个任务的触发时间(使用默认的任务组名，触发器名，触发器组名)  
     *  
     * @param jobName  
     * @param time  
     */    
    public static void modifyJobTime(String jobName, String time) {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            CronTrigger trigger = (CronTrigger) sched.getTrigger(jobName, TRIGGER_GROUP_NAME);    
            if(trigger == null) {    
                return;    
            }    
            String oldTime = trigger.getCronExpression();    
            if (!oldTime.equalsIgnoreCase(time)) {    
                JobDetail jobDetail = sched.getJobDetail(jobName, JOB_GROUP_NAME);    
                Class objJobClass = jobDetail.getJobClass();    
                String jobClass = objJobClass.getName();    
                removeJob(jobName);    
    
                addJob(jobName, jobClass, time);    
            }    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 修改一个任务的触发时间  
     *  
     * @param triggerName  
     * @param triggerGroupName  
     * @param time  
     */    
    public static void modifyJobTime(String triggerName,    
            String triggerGroupName, String time) {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            CronTrigger trigger = (CronTrigger) sched.getTrigger(triggerName, triggerGroupName);    
            if(trigger == null) {    
                return;    
            }    
            String oldTime = trigger.getCronExpression();    
            if (!oldTime.equalsIgnoreCase(time)) {    
                CronTrigger ct = (CronTrigger) trigger;    
                // 修改时间    
                ct.setCronExpression(time);    
                // 重启触发器    
                sched.resumeTrigger(triggerName, triggerGroupName);    
            }    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 移除一个任务(使用默认的任务组名，触发器名，触发器组名)  
     *  
     * @param jobName  
     */    
    public static void removeJob(String jobName) {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            sched.pauseTrigger(jobName, TRIGGER_GROUP_NAME);// 停止触发器    
            sched.unscheduleJob(jobName, TRIGGER_GROUP_NAME);// 移除触发器    
            sched.deleteJob(jobName, JOB_GROUP_NAME);// 删除任务    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 移除一个任务  
     *  
     * @param jobName  
     * @param jobGroupName  
     * @param triggerName  
     * @param triggerGroupName  
     */    
    public static void removeJob(String jobName, String jobGroupName,    
            String triggerName, String triggerGroupName) {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            sched.pauseTrigger(triggerName, triggerGroupName);// 停止触发器    
            sched.unscheduleJob(triggerName, triggerGroupName);// 移除触发器    
            sched.deleteJob(jobName, jobGroupName);// 删除任务    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 启动所有定时任务  
     */    
    public static void startJobs() {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            sched.start();    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
    
    /**  
     * 关闭所有定时任务  
     */    
    public static void shutdownJobs() {    
        try {    
            Scheduler sched = gSchedulerFactory.getScheduler();    
            if(!sched.isShutdown()) {    
                sched.shutdown();    
            }    
        } catch (Exception e) {    
            e.printStackTrace();    
            throw new RuntimeException(e);    
        }    
    }    
}

import java.text.SimpleDateFormat;   
   
import java.util.Date;   
   
import org.quartz.Job;   
import org.quartz.JobExecutionContext;   
import org.quartz.JobExecutionException;   
   
public class myJob implements Job {   
   
    @Override   
    public void execute(JobExecutionContext arg0) throws JobExecutionException {   
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");   
        System.out.println(sdf.format(new Date()));   
    }   
   
}

import java.text.SimpleDateFormat;  
import java.util.Date;  
  
import org.quartz.CronTrigger;  
import org.quartz.JobDetail;  
import org.quartz.Scheduler;  
import org.quartz.SchedulerFactory;  
import org.quartz.impl.StdSchedulerFactory;  
  
public class Test {  
    public void go() throws Exception {  
        // 首先，必需要取得一个Scheduler的引用  
        SchedulerFactory sf = new StdSchedulerFactory();  
        Scheduler sched = sf.getScheduler();  
        String time="0 51 11 ? * *";  
        // jobs可以在scheduled的sched.start()方法前被调用  
  
        // job 1将每隔20秒执行一次  
        JobDetail job = new JobDetail("job1", "group1", myJob.class);  
        CronTrigger trigger = new CronTrigger("trigger1", "group1");  
        trigger.setCronExpression(time);  
        Date ft = sched.scheduleJob(job, trigger);  
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");  
        System.out.println(  
                job.getKey() + " 已被安排执行于: " + sdf.format(ft) + "，并且以如下重复规则重复执行: " + trigger.getCronExpression());  
  
        // job 2将每2分钟执行一次（在该分钟的第15秒)  
        job = new JobDetail("job2", "group1",myJob.class);  
        trigger = new CronTrigger("trigger2", "group1");  
        trigger.setCronExpression(time);  
        ft = sched.scheduleJob(job, trigger);  
        System.out.println(  
                job.getKey() + " 已被安排执行于: " + sdf.format(ft) + "，并且以如下重复规则重复执行: " + trigger.getCronExpression());  
  
        // 开始执行，start()方法被调用后，计时器就开始工作，计时调度中允许放入N个Job  
        sched.start();  
        try {  
            // 主线程等待一分钟  
            Thread.sleep(60L * 1000L);  
        } catch (Exception e) {  
        }  
        // 关闭定时调度，定时器不再工作  
        sched.shutdown(true);  
    }  
  
    public static void main(String[] args) throws Exception {  
  
        Test test = new Test();  
        test.go();  
    }  
  
}