CRON4J framework and Spring integration example tutorial

CRON4J framework and Spring integration example tutorial Abstract: CRON4J is a simple and easy -to -use Java timing task scheduling framework, and Spring is a powerful Java development framework.This tutorial will introduce how to integrate CRON4J and Spring in order to use timing task scheduling functions in Spring applications. 1 Introduction CRON4J is an open source Java timing task scheduling framework that allows you to perform plan tasks in the form of a CRON expression.Spring is a comprehensive Java development framework, which provides functions such as dependency injection and cutting -oriented programming.By integrating CRON4J and Spring, you can easily manage and schedule time tasks in Spring applications. 2. Integrated Cron4j and Spring First, you need to introduce CRON4J dependence in your Spring project.In the pom.xml file of your project, add the following dependencies: <dependency> <groupId>it.sauronsoftware.cron4j</groupId> <artifactId>cron4j</artifactId> <version>2.2.5</version> </dependency> Then, create a timing task class that implements the Runnable interface.For example, you can create a class called Mytask: public class MyTask implements Runnable { @Override public void run() { // Write your timing task logic here System.out.println ("Perform timing tasks ..."); } } Next, add the following configuration in your Spring configuration file: <bean id="myTask" class="com.example.MyTask" /> <bean id="scheduler" class="it.sauronsoftware.cron4j.Scheduler" init-method="start"> <property name="daemon" value="true" /> <property name="mainThreadPriority" value="5" /> <property name="cleanupDaemonThreads" value="false" /> <property name="shuttingDownMessage" value="The scheduler is shutting down..." /> <property name="schedulerListenerList"> <list> <ref bean="myTask" /> </list> </property> </bean> The above configuration will create a CRON4J scheduler called Scheduler and add the MyTask timing task to the scheduler.According to your needs, you can add more timing tasks. 3. Configure CRON expression Now, you can configure the CRON expression to define the scheduling rules for timing tasks.In the Scheduler Bean in the Spring configuration file, add the following configuration: <property name="taskTable"> <list> <bean class="it.sauronsoftware.cron4j.TaskTableEntry"> <property name="expression" value="*/5 * * * * ?" /> <property name="task" ref="myTask" /> </bean> </list> </property> The above configuration will define a timing task that performs a CRON expression " */5 * * * * *?"You can modify the CRON expression as needed. 4. Start the timing task scheduler Finally, when the application starts, you need to start the timing task scheduler.At the end of the Scheduler Bean in your Spring configuration file, add the following configuration: <bean id="startup" class="it.sauronsoftware.cron4j.Scheduler" init-method="start" destroy-method="stop"> <property name="expression" value="0 0/1 * * * ?" /> <property name="task" ref="scheduler" /> </bean> The above configuration will create a timing task called Startup. The task will start the scheduler timer task scheduler when the application starts and executes it every 1 minute. 5. Run application Now you can run your Spring application and observe the output of the console.You will see the timing task performed every 5 seconds. in conclusion: This tutorial introduces how to integrate CRON4J and Spring, so as to use the timing task scheduling function in Spring applications.By using the CRON expression, you can customize the scheduling rules for timing tasks.I hope this tutorial will help you. Note: The timing tasks in this example are only used for demonstration purposes. You can write more specific timing task logic according to actual needs.