Define simple Scheduled tasks using @scheduled annotations in spring projects

As title shows, sometimes we need to configure simple scheduled tasks in a Web project, and because the tasks are not complex and do not want to use a scheduled scheduling framework (Ps:quartz, ActiveMQ, Kafka, etc.), consider using @scheduled annotations to define simple scheduled tasks. Its full configuration is as follows:

(1) Add the timing task related configuration in spring's configuration file:

The header file for the XML configuration is added:

xmlns:task= "Http://www.springframework.org/schema/task"

And adding in Xsi:schemalocation:

Http://www.springframework.org/schema/taskhttp://www.springframework.org/schema/task/spring-task-4.0.xsd

Last added:

<context:component-scan base-package= "Cn.zifangsky.task"/><task:executor id= "executor" pool-size= "5"/ ><task:scheduler id= "Scheduler" pool-size= "ten"/><task:annotation-driven executor= "executor" scheduler= "Scheduler"/>

In this case, the package, the "Cn.zifangsky.task", where spring Auto-scan timed tasks are defined first. It then defines two thread pools and the scanning mechanism for enabling timed tasks.

(2) Add Test task:

package cn.zifangsky.task;import java.text.format;import  java.text.simpledateformat;import java.util.date;import  org.springframework.scheduling.annotation.scheduled;import org.springframework.stereotype.component;@ componentpublic class simplespringtask {/** *  resumes execution of the  */@Scheduled after each task has finished executing ( fixeddelay=2000) Public void say () {date current = new date (); Format format = new simpledateformat ("Yyyy-mm-dd hh:mm:ss"); System.out.println ("--------"  + format.format (current)  +  "---------");} /** * 0 seconds to print  */@Scheduled (cron= "0 * * * * ?") Public void print () {System.out.println ("Current is the whole score!!! ");}}

, such as:

/** * Executes this method every two seconds */@Scheduled (fixedrate=2000) public void Say () {Date current = new Date (); Format format = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); System.out.println ("--------" + format.format (current) + "---------");}

Of course, the second type of task above is similar to the crontab scheduled task under Linux, with several parameter bits representing: seconds, minutes, hours, days (days in the month), month, and week

Note: If you want to learn more about using the crontab command in Linux, you can refer to this article: https://www.zifangsky.cn/591.html

(3) Test:

After running this project, the output from the final console is as follows:

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PS: The above image of the watermark is my personal blog domain name, so also please administrator mercy don't give me marked as "Reprint article", Thank you!!!

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Define simple Scheduled tasks using @scheduled annotations in spring projects