src/org/nutz/lang/Tasks.java
public static void scheduleAtCron(final Runnable task, String cronExpression) {
        TimeSchedule timeSchedule = new TimeSchedule(task, cronExpression);
        timeSchedule.start();
    }
public static void scheduleAtCron(final Runnable task, String cronExpression) {
        TimeSchedule timeSchedule = new TimeSchedule(task, cronExpression);
        timeSchedule.start();
    }
通过 cron 表达式来配置任务的启动时间
@param task
@param cronExpression