quartz一分钟教程 java任务调度

 quartz是干啥的？ 任务调度用的
任务调度是干啥的？就是在预定的时间做预定的事
1.在quart网站下最新的JAR包
2.建个项目，把quartz的JAR包加入到项目
3.新建一个任务
public class MyJob implements org.quartz.Job {
@Override
public void execute(JobExecutionContext arg0) throws JobExecutionException {
System.out.println("我被调用了");
}

}

4.开启任务：
public class StartSchedule {
public static void main(String[] args) throws Exception {
SchedulerFactory sf = new StdSchedulerFactory();
Scheduler sched = sf.getScheduler();
JobDetail job = new JobDetail("job1", "group1", MyJob.class);
CronTrigger t = new CronTrigger("trigger1", "group1", "job1", "group1", "0/2 * * * * ?");
sched.scheduleJob(job, t);
sched.start();
Thread.sleep(500000);
sched.shutdown(true);
}
}

5.运行StartSchedule即可
其中：
"0/2 * * * * ?" 是cronExpression表达式
一共有7组数据组成，位与位之间用空间分隔
分别代表  “秒 分 时 日 月 周 年” 其中年是可以省略的，所以在例子中用了6组
官方的例子：
Examples
Here are some full examples:
Expression
Meaning
0 0 12 * * ?

Fire at 12pm (noon) every day
0 15 10 ? * *

Fire at 10:15am every day
0 15 10 * * ?

Fire at 10:15am every day
0 15 10 * * ? *

Fire at 10:15am every day
0 15 10 * * ? 2005

Fire at 10:15am every day during the year 2005
0 * 14 * * ?

Fire every minute starting at 2pm and ending at 2:59pm, every day
0 0/5 14 * * ?

Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day
0 0/5 14,18 * * ?

Fire every 5 minutes starting at 2pm and
ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending
at 6:55pm, every day
0 0-5 14 * * ?

Fire every minute starting at 2pm and ending at 2:05pm, every day
0 10,44 14 ? 3 WED

Fire at 2:10pm and at 2:44pm every Wednesday in the month of March.
0 15 10 ? * MO