Learn the JDK Timer scheduler example without Spring and compare the different with this example.

In this example, you will use Spring’s Scheduler API to schedule a task.

Download this example here – Spring-Scheduler-JDK-TimerExample.zip

Create a scheduler task…

package com.mkyong.common;
 
public class RunMeTask
{
	public void printMe() {
		System.out.println("Run Me ~");
	}
}
<bean id="runMeTask" class="com.mkyong.common.RunMeTask" />

Spring comes with a MethodInvokingTimerTaskFactoryBean as a replacement for the JDK TimerTask. You can define your target scheduler object and method to call here.

<bean id="schedulerTask" 
  class="org.springframework.scheduling.timer.MethodInvokingTimerTaskFactoryBean">
	<property name="targetObject" ref="runMeTask" />
	<property name="targetMethod" value="printMe" />
</bean>

Spring comes with a ScheduledTimerTask as a replacement for the JDK Timer. You can pass your scheduler name, delay and period here.

<bean id="timerTask"
	class="org.springframework.scheduling.timer.ScheduledTimerTask">
	<property name="timerTask" ref="schedulerTask" />
	<property name="delay" value="1000" />
	<property name="period" value="60000" />
</bean>

In last, you can configure a TimerFactoryBean bean to start your scheduler task.

<bean class="org.springframework.scheduling.timer.TimerFactoryBean">
	<property name="scheduledTimerTasks">
		<list>
			<ref local="timerTask" />
		</list>
	</property>
</bean>

Spring-Scheduler.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
 
<bean id="schedulerTask" 
  class="org.springframework.scheduling.timer.MethodInvokingTimerTaskFactoryBean">
	<property name="targetObject" ref="runMeTask" />
	<property name="targetMethod" value="printMe" />
</bean>
 
<bean id="runMeTask" class="com.mkyong.common.RunMeTask" />
 
<bean id="timerTask"
	class="org.springframework.scheduling.timer.ScheduledTimerTask">
	<property name="timerTask" ref="schedulerTask" />
	<property name="delay" value="1000" />
	<property name="period" value="60000" />
</bean>
 
<bean class="org.springframework.scheduling.timer.TimerFactoryBean">
	<property name="scheduledTimerTasks">
		<list>
			<ref local="timerTask" />
		</list>
	</property>
</bean>
 
</beans>

Run it

package com.mkyong.common;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class App 
{
    public static void main( String[] args )
    {
    	ApplicationContext context = 
		  new ClassPathXmlApplicationContext("Spring-Scheduler.xml");
    }
}

No code need to call the scheduler task, the TimerFactoryBean will run your schedule task during start up. As result, Spring scheduler will run the printMe() method every 60 seconds, with a 1 second delay for the first time of execution.

This article was posted in Spring category.

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