Java 从现在开始每 14 分钟运行一次 Quartz cron 表达式
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Quartz cron expression to run job at every 14 minutes from now
提问by Vipul
I want to run a job at every 14 minutes form now.
我现在想每 14 分钟运行一次工作。
For example if I schedule a job at 11:04 am, using 0 0/14 * * * ?cron expression.
then expected fire time suppose to be 11:18,11:32,11:46 and so on .
but it will fire at 11:00,11:14:11,28:11:42,11:56,12:00 which is not expected.
and why it fired at 12:00 o'clock after 11:56, there is diff of only 4 min.
例如，如果我在上午 11:04 安排工作，则使用0 0/14 * * * ?cron 表达式。然后预计开火时间假设为 11:18,11:32,11:46 等等。但它会在 11:00,11:14:11,28:11:42,11:56,12:00 触发，这不是预期的。以及为什么它在 11:56 之后的 12:00 点开火，只有 4 分钟的差异。
- How can I achieve what I want using cron expression?
- Can any one explain me this behaviour of quartz cron?
- 如何使用 cron 表达式实现我想要的？
- 任何人都可以向我解释石英 cron 的这种行为吗？
Thanks in advance.
提前致谢。
采纳答案by alexey28
Well, 0/14 give you fire time at 00, 14, 28, 42, 56 and again at 00 minutes of every hour. So last interval will be not 14 but 4 minutes. Thats how cron works. You can get equals interval in minutes only for cases when remainder of the division 60 by your interval is zero.
好吧，0/14 为您提供在 00、14、28、42、56 和每小时 00 分钟的点火时间。所以最后一次间隔将不是 14 分钟而是 4 分钟。这就是 cron 的工作原理。只有在除法 60 的余数除以您的间隔为零的情况下，您才能获得以分钟为单位的相等间隔。
回答by Ruchira Gayan Ranaweera
You get it wrong. 0/14means it will fire each hour starting from 0after 14min. That's why it is firing at 12.00
你弄错了。0/14意味着它将从0after开始每小时触发一次14min。这就是为什么它正在射击12.00
回答by shreyansh jogi
you should change your cronexpression to 0 0/14 * 1/1 * ? *
你应该改变你的cron表达0 0/14 * 1/1 * ? *
回答by Frederic Close
your cron expression should look like
你的 cron 表达式应该看起来像
0 0/14 * 1/1 * ? *
A great website to create your cron expression when you are in doubt : http://www.cronmaker.com/
一个很棒的网站，可以在您有疑问时创建您的 cron 表达式：http: //www.cronmaker.com/
it will help you build your cron expression and show you the next firing date times of your cron.
它将帮助您构建您的 cron 表达式并显示您的 cron 的下一个触发日期时间。
For More Reference : http://www.nncron.ru/help/EN/working/cron-format.htm
回答by Prabhakaran Ramaswamy
Use this cron expression.
使用这个 cron 表达式。
0 0/14 * ** ?
0 0/14 * ** ?
回答by Zaka
"0 0/14 * * * ?" means the next fire time from the beginning of the clock for every 14 minutes interval, like what you said.
“0 0/14 * * * ？” 表示每 14 分钟间隔从时钟开始的下一次触发时间，就像您说的那样。
The 1st '0' means SECOND at 0 (or 12) at the clock; and same for the 2nd '0' which means the MINUTE at 0 (or 12) at the clock; '/14' means 14 minutes as the interval.
第一个 '0' 表示时钟为 0（或 12）的第二个；和第二个“0”相同，这意味着时钟上的 MINUTE 为 0（或 12）；'/14' 表示间隔为 14 分钟。
So get the SECOND and MINUTE from current timeand concatenate them with the interval into a cron expression then fire it. Below is the example for Java:
所以从当前时间获取 SECOND 和 MINUTE并将它们与间隔连接成一个 cron 表达式，然后触发它。下面是 Java 的例子：
public static String getCronExpressionFromNowWithSchedule(int minuteInterval) throws Exception {
String cronExpression = "";
Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH); // Note: zero based!
int day = now.get(Calendar.DAY_OF_MONTH);
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
int second = now.get(Calendar.SECOND);
int millis = now.get(Calendar.MILLISECOND);
if (minuteInterval<=0) cronExpression = (second+1)+" * * * * ?";
else cronExpression = (second+1)+" "+minute+"/"+minuteInterval+" * * * ?";
System.out.println(cronExpression);
return cronExpression;
}
The next fire time is at next second from current time for the Minute interval you passed into this method.
下一次触发时间是您传入此方法的分钟间隔的当前时间的下一秒。
