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This article mainly explains "how to achieve SpringBoot timing tasks", the content of the explanation is simple and clear, easy to learn and understand, now please follow the editor's ideas slowly in depth, together to study and learn "SpringBoot timing tasks how to achieve" it!

The SpringBoot timing task is mainly accomplished by two annotations.

@ Scheduled is added to the method.

EnableScheduling is added to the class. It can be an Application class, a @ Component class, a @ Controller class, and so on. To understand the springcloud architecture, please add: three, six, two, four, seven, two, 59

As follows

@ SpringBootApplication@EnableSchedulingpublic class Application {public static void main (String [] args) {SpringApplication.run (Application.class, args);}}

If @ EnableScheduling does not want to be added to the Application, you can also do the following

@ Component@EnableSchedulingpublic class ScheduledTasks {private static final SimpleDateFormat dateFormat = new SimpleDateFormat ("HH:mm:ss"); @ Scheduled (fixedRate = 5000) public void reportCurrentTime () {System.out.println ("now time:" + dateFormat.format (new Date ();}}

@ Scheduled is used as follows:

@ Scheduled (fixedRate=5000): execute @ Scheduled 5 seconds after the last execution time point (fixedDelay = 5000): execute @ Scheduled (initialDelay=1000, fixedRate=5000) 5 seconds after the last execution completion time point: execute after the first delay of 1 second, and then execute @ Scheduled (cron= "0 * / 1 *?") every 5 seconds according to the fixedRate rule: define the rule through the cron expression, which means that it is executed every 1 minute.

The use of cron expressions is as follows:

The cron expression in turn represents [seconds] [minutes] [hours] [day] [month] [week] [year]

Common examples of Cron are as follows:

* / 5 *? Indicates that 0 * / 1 * is executed every 5 seconds? It means to execute 0 15 10 every 1 minute? * MON-FRI means at 10:15 on Monday, Tuesday, Wednesday and Thursday, AM 0 15 10 10 *? It means 10:15 on the 10th of each month, AM 0 15 10 L *? 10:15 on the last day of every month AM 0 10 10? * 6L 10:10 on the last Friday of every month AM 0 10 10? * 6L 2014-2017 at 2014, 2015, 2016 And 10:10 on the last Friday of every month in mid-2017 AM 0 15 10? * 6 * 3 10:15 on the third Friday of every month AM 0 012 1 *? 12:00 every five days from the first day of each month PM (noon) 0 11 11 11? Every 11:11 on November 11 AM 0 10 WED 44 14? 3 WED 2:10 PM and 2:44 PM on every Wednesday in March

Where the meaning of the special symbol in the expression is:

The "*" represents the entire time period of this time unit. For example, if you put it above the second, it means any second, and if you put it above the score, it means any minute.

"?" Character: indicates an uncertain value (Note:? Number can only be used in daily and weekly domains, but not in both domains. If you specify a value for one of these two fields, you must put a? on the other word value, such as: 000 *?)

"," character: specify several values

"-" character: specifies a range of values

"/" character: specifies the increment of a value. N means to start with n and increase m every time.

"L" character: used in the day to indicate the last day of the month, and in the week to denote the last week of the month X

"W" character: specifies the working day closest to a given date (Monday to Friday)

The "#" character: indicates the week X of the month. 5: 2 means the second Thursday of the month (the first day of the week begins on Sunday, that is, the value of Sunday is: 1)

Thank you for your reading, the above is the content of "how to achieve SpringBoot timing tasks". After the study of this article, I believe you have a deeper understanding of how to achieve SpringBoot timing tasks, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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