Guide to use the ‘Cl Cronlike’ framework in the Java class library
Guide to use the ‘Cl Cronlike’ framework in the Java class library
introduction:
‘Cl Cronlike’ is a lightweight timing task scheduling framework based on Java. It simulates the CRON expression in the Unix system and can easily achieve task scheduling and timing execution in the Java application.This article will introduce the guidelines for the use of the 'Cl Cronlike' framework, including installation configuration, basic concepts and example code.
1. Installation configuration:
1. First, introduce the dependencies of the 'Cl Cronlike' framework in the Java project.You can add the following Maven to the pom.xml file of the project::
<dependency>
<groupId>com.github.alpacadabra</groupId>
<artifactId>cl-cronlike</artifactId>
<version>1.0.0</version>
</dependency>
2. Introduce the required Java package:
import com.github.alpacadabra.clcronlike.scheduling.CronTask;
import com.github.alpacadabra.clcronlike.scheduling.CronTaskScheduler;
import com.github.alpacadabra.clcronlike.scheduling.CronTrigger;
import java.util.Date;
import java.util.TimerTask;
2. Basic concepts:
1. CRON expression: The core concept of 'clronlike' is the CRON expression, which is very similar to the CRON expression in the UNIX system.The CRON expression is a string consisting of 6 fields. Each field represents a time unit: second, subordinate, time, date, month and week.For example, the following is an example of a CRON expression: ` * * * * * *?It means it will be executed once a second.
2. Timing task: timing task refers to tasks that need to be arranged in accordance with the scheduled timetable.In 'clonlike', by creating a CrontRigger instance and associating a Crontask, the scheduling and execution of timing tasks can be achieved.
Third, sample code:
Below is a simple example code that demonstrates how to create and schedule a timing task with the 'clronlike' framework.
public class CronTaskExample {
public static void main(String[] args) {
// Create a CRONTASKSCHEDULER instance
CronTaskScheduler scheduler = new CronTaskScheduler();
// Create a cron expression
String cronExpression = "0 * * * * ?";
// Create a timing task
CronTask task = new CronTask(new TimerTask() {
@Override
public void run() {
// Writing here the task logic that requires regular execution
System.out.println ("Time task is executed ...");
}
}, cronExpression);
// Add the time task to the scheduler
scheduler.schedule(task);
// Start scheduler
scheduler.start();
// After 10 seconds of execution, stop the scheduler
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
scheduler.stop();
}
}
The above example code creates a timing task performed once a minute and outputs a message in the task.The scheduler will perform the task until the start of the Stop () method is stopped.
in conclusion:
By reading this article, you have learned the installation and configuration, basic concepts and example code of the 'Cl Cronlike' framework.You can easily use this framework to easily implement the timing task scheduling in the Java application.Hope this article will help you!
