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【Java】Java里的定时任务

方法调用

try {
// 每天12点执行定时任务
timing("12:00:00");
} catch (ParseException e) {
e.printStackTrace();
}

方法体


/**
* @param time 每天几点执行定时任务   24小时制时间 例: 08:00:00  20:00:00
* @throws ParseException
*/
private void timing(String time) throws ParseException {
int hour = Integer.parseInt(time.substring(0, 2));
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat format2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// 获取当前小时
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
int currentHour = calendar.get(Calendar.HOUR_OF_DAY);
long delayTime;
long currentTime = System.currentTimeMillis();
if (currentHour < hour) {
// 延时时间 = 当天8点-当前时间
String currentDay = format1.format(new Date());
long currentDay8 = format2.parse(currentDay + " " + time).getTime();
delayTime = currentDay8 - currentTime;
} else if (currentHour == hour) {
delayTime = 0;
} else {
// 延时时间 = 明天8点-当前时间
Date date = new Date();
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(Calendar.DATE, 1);
String nextDay = format1.format(c.getTime());
long nextDay8 = format2.parse(nextDay + " " + time).getTime();
delayTime = nextDay8 - currentTime;
}
TimerTask task = new TimerTask() {
@Override
public void run() {
//TODO 执行任务
}
};
Timer timer = new Timer(true);
timer.schedule(task, delayTime, 24 * 60 * 60 * 1000);
}

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