yupi0 2010-05-28
本文转自:http://sunny.blog.51cto.com/182601/32366
关于在Spring中的任务计划的使用
我今天结合Spring技术手册中的内容,总共总结了5个方面:
1:使用最简单的任务计划,就是继承java.util.TimerTask类,最关键的当然是配置beans-config.xml
文件了,因为我们使用的是spring来管理任务计划。
继承TimerTask类的写法如下:
packagecom;
importjava.util.TimerTask;
publicclassDemoTaskextendsTimerTask{
publicvoidrun(){
System.out.println("任务程序启动,这时我的第一个任务程序......");
}
}
beans-config.xml的写法如下:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--定义定时任务类-->
<beanid="demoTask"class="com.DemoTask"/>
<beanid="scheduledTimerTask"class="org.springframework.scheduling.timer.ScheduledTimerTask">
<!--这里定义定时任务的对象的位置-->
<propertyname="timerTask">
<refbean="demoTask"/>
</property>
<!--这里定义每六秒钟程序执行一次-->
<propertyname="period">
<value>6000</value>
</property>
<!--这里定义程序启动两秒钟后开始执行-->
<propertyname="delay">
<value>2000</value>
</property>
</bean>
<beanid="timerFactoryBean"class="org.springframework.scheduling.timer.TimerFactoryBean">
<propertyname="scheduledTimerTasks">
<list>
<refbean="scheduledTimerTask"/>
</list>
</property>
</bean>
</beans>
启动程序的写法:
packagecom;
importjava.io.BufferedReader;
importjava.io.InputStreamReader;
importorg.springframework.context.support.FileSystemXmlApplicationContext;
publicclassTimerTaskDemo{
/**
*@authorsunny这个程序用于测试spring框架中的任务管理,这个一个最简单地实现定时任务的方式
*@paramargs
*/
publicstaticvoidmain(String[]args)throwsException{
newFileSystemXmlApplicationContext("beans-config.xml");
System.out.println("启动任务...");
System.out.println("请输入exit关闭程序.....");
BufferedReaderreader=newBufferedReader(newInputStreamReader(System.in));
while(true){
if(reader.readLine().equals("exit")){
System.exit(0);
}
}
}
}
2:当我们在程序中不能继承TimerTask类了,我们应该怎样写呢?那我们就需要在程序中使用spring提供的"org.springframework.scheduling.timer.MethodInvokingTimerTaskFactoryBean"类来进行处理了。不同的地方就是
xml的配置文件的写法,程序中需要指定执行哪一个类的哪一个方法:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--定义定时任务类-->
<beanid="demoTask"class="com.DemoTask"/>
<beanid="timerTaskBean"class="org.springframework.scheduling.timer.MethodInvokingTimerTaskFactoryBean">
<propertyname="targetObject">
<refbean="demoTask"/>
</property>
<propertyname="targetMethod">
<value>run</value>
</property>
</bean>
<beanid="scheduledTimerTask"class="org.springframework.scheduling.timer.ScheduledTimerTask">
<!--这里定义定时任务的对象的位置-->
<propertyname="timerTask">
<refbean="timerTaskBean"/>
</property>
<!--这里定义每六秒钟程序执行一次-->
<propertyname="period">
<value>6000</value>
</property>
<!--这里定义程序启动两秒钟后开始执行-->
<propertyname="delay">
<value>2000</value>
</property>
</bean>
<beanid="timerFactoryBean"class="org.springframework.scheduling.timer.TimerFactoryBean">
<propertyname="scheduledTimerTasks">
<list>
<refbean="scheduledTimerTask"/>
</list>
</property>
</bean>
</beans>
3A:由于jdk标准api提供的Timer功能有限,只能指定任务与任务之间的周期,而无法指定某个特定的时间内执行某项任务,所以现在
推荐使用Quartz来解决这样的问题。接下来的这个程序仍然是解决周期问题的,要循序渐进。。。
QuartzJobBean类用于重复调用JobData类的方法执行getData()方法。QuartzJobBean必须继承QuartzJobBean
packagecom;
importorg.quartz.JobExecutionContext;
importorg.springframework.scheduling.quartz.QuartzJobBean;
publicclassDemoJobextendsQuartzJobBean{
privateJobDatajobData;
protectedvoidexecuteInternal(JobExecutionContextarg0){
System.out.println(jobData.getData()+"第一个已经被执行了!!");
}
publicJobDatagetJobData(){
returnjobData;
}
publicvoidsetJobData(JobDatajobData){
this.jobData=jobData;
}
}
packagecom;
importjava.text.SimpleDateFormat;
importjava.util.Date;
publicclassJobData{
publicStringgetData(){
SimpleDateFormatddd=newSimpleDateFormat("yyyy-MM-ddhh:mm:ss");
return"Datafrom"+ddd.format(newDate());
}
}
关键在于beans-config.xml配置文件的写法
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--定义定时任务类-->
<beanid="someData"class="com.JobData"/>
<beanid="jobDetailBean"class="org.springframework.scheduling.quartz.JobDetailBean">
<propertyname="jobClass">
<value>com.DemoJob</value>
</property>
<propertyname="jobDataAsMap">
<map>
<entrykey="jobData">
<refbean="someData"/>
</entry>
</map>
</property>
</bean>
<beanid="simpleTriggerBean"class="org.springframework.scheduling.quartz.SimpleTriggerBean">
<!--这里定义定时任务的对象的位置-->
<propertyname="jobDetail">
<refbean="jobDetailBean"/>
</property>
<!--这里定义每六秒钟程序执行一次-->
<propertyname="repeatInterval">
<value>6000</value>
</property>
<!--这里定义程序启动两秒钟后开始执行-->
<propertyname="startDelay">
<value>2000</value>
</property>
</bean>
<beanid="timerFactoryBean"class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<propertyname="triggers">
<list>
<refbean="simpleTriggerBean"/>
</list>
</property>
</bean>
</beans>
启动程序的文件相同。
3B:
如果需求中要求将来的某个时间点执行某项操作,那么配置文件中则必须使用
org.springframework.scheduling.quartz.CronTriggerBean。具体配置如下:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--定义定时任务类-->
<beanid="someData"class="com.JobData"/>
<beanid="jobDetailBean"class="org.springframework.scheduling.quartz.JobDetailBean">
<propertyname="jobClass">
<value>com.DemoJob</value>
</property>
<propertyname="jobDataAsMap">
<map>
<entrykey="jobData">
<refbean="someData"/>
</entry>
</map>
</property>
</bean>
<beanid="cronTriggerBean"class="org.springframework.scheduling.quartz.CronTriggerBean">
<!--这里定义定时任务的对象的位置-->
<propertyname="jobDetail">
<refbean="jobDetailBean"/>
</property>
<!--这里定义每天11点07分的时候程序执行一次-->
<propertyname="cronExpression">
<value>00711**?</value>
</property>
</bean>
<beanid="schedulerFactoryBean"class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<propertyname="triggers">
<list>
<refbean="cronTriggerBean"/>
</list>
</property>
</bean>
</beans>
4:如果程序不允许继承QuartzJobBean类,我们怎样处理呢?那么我们可以采用spring提供的MethodInvokingJobDetailFactoryBean
来进行处理,
packagecom;
/**
*这里不需要继承quartz类了
*@authorAdministrator
*
*/
publicclassDemoJob{
privateJobDatajobData;
publicJobDatagetJobData(){
returnjobData;
}
publicvoidsetJobData(JobDatajobData){
this.jobData=jobData;
}
publicvoidexecute(){
System.out.println(jobData.getData()+"被执行了。");
}
}
packagecom;
importjava.text.SimpleDateFormat;
importjava.util.Date;
publicclassJobData{
publicStringgetData(){
SimpleDateFormatddd=newSimpleDateFormat("yyyy-MM-ddhh:mm:ss");
return"Datafrom"+ddd.format(newDate());
}
}
具体的xml文件配置如下:
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--定义定时任务类-->
<beanid="someData"class="com.JobData"/>
<beanid="someJob"class="com.DemoJob">
<propertyname="jobData">
<refbean="someData"/>
</property>
</bean>
<beanid="jobDetailBean"class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<propertyname="targetObject">
<refbean="someJob"/>
</property>
<propertyname="targetMethod">
<value>execute</value>
</property>
</bean>
<beanid="cronTriggerBean"class="org.springframework.scheduling.quartz.CronTriggerBean">
<!--这里定义定时任务的对象的位置-->
<propertyname="jobDetail">
<refbean="jobDetailBean"/>
</property>
<!--这里定义每天11点07分的时候程序执行一次-->
<propertyname="cronExpression">
<value>02711**?</value>
</property>
</bean>
<beanid="schedulerFactoryBean"class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<propertyname="triggers">
<list>
<refbean="cronTriggerBean"/>
</list>
</property>
</bean>
</beans>