cron表达式是什么？cron表达式每5分钟一次 世界通讯
cron表达式是什么：
cron表达式是一个字符串，该字符串由6个空格分为7个域，每一个域代表一个时间含义。常用语定时任务。
cron表达式每5分钟一次：
JobDetail job1 = JobBuilder.newJob(FirstJob.class).withIdentity("job1", "group1").build();
Trigger trigger1 = TriggerBuilder.newTrigger().withIdentity("cronTrigger1", "group1")
.withSchedule(CronScheduleBuilder.cronSchedule("*/10 * * * * ?")).build();
Scheduler scheduler1 = new StdSchedulerFactory().getScheduler();
scheduler1.start();
scheduler1.scheduleJob(job1, trigger1);
JobDetail job2 = JobBuilder.newJob(SecondJob.class).withIdentity("job2", "group2").build();
Trigger trigger2 = TriggerBuilder.newTrigger().withIdentity("cronTrigger2", "group2")
.withSchedule(CronScheduleBuilder.cronSchedule(new CronExpression("0/7 * * * * ?"))).build();
Scheduler scheduler2 = new StdSchedulerFactory().getScheduler();
scheduler2.start();
scheduler2.scheduleJob(job2, trigger2);
Thread.sleep(100000);
scheduler1.shutdown();
scheduler2.shutdown();
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