Quartz is a powerful enterprise-level task scheduling framework that inherits and simplifies quartz in spring, and looks at how quartz is configured in spring:
First, let's write a class that is scheduled:
package Com.kay.quartz;
Public class Quartzjob
{
public void work ()
{
System.out.println ("Quartz Task Scheduler!!! ");
}
}
Spring's configuration file:
XML version= "1.0" encoding= "UTF-8"?>
<!DOCTYPE beans Public "-//spring//dtd bean//en" "Http://www.springframework.org/dtd/spring-beans.dtd">
<Beans>
<!--The work class to invoke-
<BeanId= "Quartzjob"Class= "Com.kay.quartz.QuartzJob"></Bean>
<!--Define methods for calling and invoking objects-
<BeanId= "Jobtask"Class= "Org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<!--The class that is called-
<PropertyName= "TargetObject">
<RefBean= "Quartzjob"/>
</Property>
<!--Calling methods in a class-
<PropertyName= "Targetmethod">
<Value>Work</Value>
</Property>
</Bean>
<!--Define Trigger Time-
<BeanId= "Dotime"Class= "Org.springframework.scheduling.quartz.CronTriggerBean">
<PropertyName= "Jobdetail">
<RefBean= "Jobtask"/>
</Property>
<!--Cron-expression-
<PropertyName= "Cronexpression">
<Value>10,15,20,25,30,35,40,45,50,55 * * * *?</Value>
</Property>
</Bean>
<!--General Management Class if you lazy-init= ' false ' then the container starts executing the scheduler-
<BeanId= "Startquertz"Lazy-init= "false"Autowire= "No"Class= "Org.springframework.scheduling.quartz.SchedulerFactoryBean">
<PropertyName= "Triggers">
<List>
<RefBean= "Dotime" />
</list>
</< Span style= "color: #800000;" >property>
</bean >
</beans>
Test procedure:
PackageCom.kay.quartz;
ImportOrg.springframework.context.ApplicationContext;
ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;
PublicClassMaintest
{
/**
*@paramArgs
*/
PublicStaticvoidMain (string[] args)
{
System.out.println ("Test start.");
ApplicationContext context=New classpathxmlapplicationcontext ( "quartz-config.xml ");
// If the Startquertz bean lazy-init is set to false in the configuration file, you do not instantiate
//context.getbean ("Startquertz");
system.out.print ( "test end. ");
}
We need to put the log4j configuration file into the SRC directory, start the main class is ready.
About cron expressions (from the network):
The Cron expression consists of the following 7 fields:
- Seconds
- Score of
- Hours
- Date within the month
- Month
- Week Date
- Year (optional field)
Special characters
Cron triggers take advantage of a series of special characters, as follows:
- The backslash (/) character represents the increment value. For example, in the seconds field, "5/15" represents the beginning of the 5th second, once every 15 seconds.
- The question mark (?) character and the letter L character are available only in the date and week date fields within the month. A question mark indicates that the field does not contain a specific value. Therefore, if you specify a date within a month, you can insert "?" in the Date field within the week, which means that the date value in the week does not matter. The letter L character is the last abbreviation. Placed in the Month Date field, indicates that the schedule is scheduled to be executed on the last day of the month. In the week Date field, if "L" exists alone, it is equal to "7", otherwise it represents the last instance of the week date within the month. So "0L" means that it is scheduled to be executed on the last Sunday of the month.
- The letter (W) character in the Date field in the month arranges the execution at the working day closest to the specified value. Placing "1W" in the Month Date field indicates that the execution is scheduled for the first business day of the month.
- The pound sign (#) character specifies a specific weekday instance for a given month. Put "mon#2" in the week Date field, indicating that the task is scheduled for the second Monday of the month.
- The asterisk (*) character is a wildcard character that indicates that the field can accept any possible value.
Special characters allowed for field allowed values
Seconds 0-59,-*/
Sub 0-59,-*/
Hours 0-23,-*/
Date 1-31,-*? /L W C
Month 1-12 or JAN-DEC,-*/
Week 1-7 or Sun-sat,-*? /L C #
Year (optional) leave blank, 1970-2099,-*/
Meaning of an expression
"0 0 12 * *?" trigger 12 o'clock noon every day.
"0 15 10?" * * "trigger 10:15 every day"
"0 15 10 * *?" Daily 10:15 Trigger
"0 15 10 * *?" * "10:15 per day" trigger
"0 15 10 * *?" 2005 "2005-year daily 10:15 Trigger
"0 * 14 * *?" triggers every 1 minutes from 2 o'clock in the afternoon to 2:59 daily
"0 0/5 14 * *?" triggers every 5 minutes from 2 o'clock in the afternoon to 2:55 daily
"0 0/5 14,18 * *?" triggers every 5 minutes from 2 o'clock in the afternoon to 2:55 daily and from 6 o'clock in the afternoon to 6:55
"0 0-5 14 * *?" triggers every 1 minutes from 2 o'clock in the afternoon to 2:05 daily
"0 10,44 14?" 3 WED "2:10 and 2:44 triggers in Wednesday of every March
"0 15 10?" * Mon-fri "Monday to Friday 10:15 trigger
"0 15 10 15 *?" 15th 10:15 per month
"0 L *?" 10:15 on the last day of the month
"0 15 10?" * 6L "Last month of Friday 10:15 Trigger
"0 15 10?" * 6L 2002-2005 "2002 to 2005 the last of the monthly Friday 10:15 trigger
"0 15 10?" * 6#3 "Monthly third Friday 10:15 trigger
Every morning at 6.
0 6 * * *
Every two hours
0 */2 * * *
Every two hours between 11 o'clock and 8 in the morning, eight in the morning.
0 23-7/2,8 * * *
Every month, number 4th and Monday to Sunday, three a.m., 11.
0 11 4 * 1-3
January 1 morning, 4.
0 4 1 1 *
More knowledge:
Http://www.ibm.com/developerworks/cn/java/j-quartz/index.html
http://www.javaeye.com/topic/117244
Configuration of quartz in spring
