Details and examples of Quartz scheduler in Java Spring

1. Features of Quartz

* According to the inheritance of the job class, there are mainly the following two types:

1. The working class inheritance org. springframework. scheduling. quartz. QuartzJobBean class

2. The working class not inherit org. springframework. scheduling. quartz. QuartzJobBean class

Note: I prefer the second one, because the assignment in this way is still POJO.

* According to the trigger time of task scheduling, there are mainly the following two types:

1. Every time is triggered, the corresponding scheduler to org springframework. scheduling. quartz. SimpleTriggerBean

2. Each to a specified time is triggered, the corresponding scheduler to org springframework. scheduling. quartz. CronTriggerBean

Note: Both of these triggers can be combined with both of the job inheritance methods.

The following is a brief demonstration of the use of Quartz in spring.

2. The working class inheritance org. springframework. scheduling. quartz. QuartzJobBean class, 1 each to the designated time is triggered

1. Write the job class

package bean.jobDetailBean; 
 
import org.quartz.JobExecutionContext; 
import org.quartz.JobExecutionException; 
import org.springframework.scheduling.quartz.QuartzJobBean; 
 
public class Job1 extends QuartzJobBean { 
 
private int timeout; 
private static int i = 0; 
 
// The dispatch factory is instantiated after passing through timeout The time begins to execute the schedule  
public void setTimeout(int timeout) { 
 this.timeout = timeout; 
} 
 
/** 
*  The specific task to be scheduled  
*/ 
@Override 
protected void executeInternal(JobExecutionContext context) 
throws JobExecutionException { 
 
 System.out.println(" inheritance QuartzJobBean The way of - scheduling " + ++i + " ongoing ..."); 
 } 
} 

2. Configure the job class

<!--  Job use inheritance QuartzJobBean The way of  --> 
<bean name="job1" class="org.springframework.scheduling.quartz.JobDetailBean"> 
<property name="jobClass" value="bean.jobDetailBean.Job1" /> 
<property name="jobDataAsMap"> 
<map> 
<entry key="timeout" value="0" /> 
</map> 
</property> 
</bean> 

3. Configure the triggering mode of job scheduling

<!--  Corresponds to job succession QuartzJobBean Kind of the way  --> 
<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean"> 
<property name="jobDetail" ref="job1" /> 
 
<!-- 
"cronExpression" Configuration description of  
 
 field   permitted   Special characters allowed  
 seconds  0-59 , - * / 
 points  0-59 , - * / 
 hours  0-23 , - * / 
 The date of  1-31 , - * ? / L W C 
 in  1-12  or  JAN-DEC , - * / 
 week  1-7  or  SUN-SAT , - * ? / L C # 
 Year (optional)   blank , 1970-2099 , - * / 
 
-  interval  
*  The wildcard  
?  You don't want to set that field  
--> 
 
<!--  The minute 0,10,20,30,40,50 Second scheduling 1 time  --> 
<property name="cronExpression" value="0,10,20,30,40,50 * * * * ?" /> 
</bean> 

4. Configure the scheduling factory

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> 
<property name="triggers"> 
<list> 
<ref bean="cronTrigger" /> 
</list> 
</property> 
</bean> 

5. Enable scheduling

package test; 
 
import org.springframework.beans.factory.BeanFactory; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
public class ScheduleTest { 
 
public static void main(String[] args){ 
<span style="white-space:pre"> </span>BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext*.xml"); 
 } 
} 

3. The working class not inherit org. springframework. scheduling. quartz. QuartzJobBean class, every time is triggered once

1. Write the job class

package bean.jobDetailBean; 
 
public class Job2 { 
 
private static int i = 0; 
 
public void doJob2() { 
 System.out.println(" No inheritance QuartzJobBean way - scheduling " + ++i + " ongoing ..."); 
 } 
} 

2. Configure the job class

<bean id="job2" 
class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"> 
<property name="targetObject"> 
<bean class="bean.jobDetailBean.Job2" /> 
</property> 
<property name="targetMethod" value="doJob2" /> 
<property name="concurrent" value="false" /><!--  Jobs are not concurrent scheduled  --> 
</bean> 

3. Configure the triggering mode of job scheduling

<bean id="simpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean"> 
<property name="jobDetail" ref="job2" /> 
<property name="startDelay" value="0" /><!--  The dispatch factory is instantiated after passing through 0 The schedule starts in seconds  --> 
<property name="repeatInterval" value="2000" /><!--  every 2 Second scheduling 1 time  --> 
</bean> 

4. Configure the scheduling factory

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> 
<property name="triggers"> 
<list> 
<ref bean="simpleTrigger" /> 
</list> 
</property> 
</bean> 

5. Enable scheduling

package test; 
 
import org.springframework.beans.factory.BeanFactory; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
public class ScheduleTest { 
 
public static void main(String[] args){ 
 
 BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext*.xml"); 
 } 
} 

A quick example of spring's built-in scheduler.

Thank you for reading, I hope to help you, thank you for your support to this site!