通常來說蜂挪，如果要執(zhí)行一個定時任務(wù)耐量，基本上的操作是這樣的：

public class Task3 {  
    public static void main(String[] args) {  
        Runnable runnable = new Runnable() {  
            public void run() {  
                // task to run goes here  
                System.out.println("Hello !!");  
            }  
        };  
        ScheduledExecutorService service = Executors  
                .newSingleThreadScheduledExecutor();  
        // 第二個參數(shù)為首次執(zhí)行的延時時間，第三個參數(shù)為定時執(zhí)行的間隔時間  
        service.scheduleAtFixedRate(runnable, 10, 1, TimeUnit.SECONDS);  
    }  
}  

這種情況要main方法中顯式的調(diào)用scheduleAtFixedRate方法才能運(yùn)行蛤虐。但是在Spring環(huán)境中或者Web環(huán)境中沒有main方法获印，或者沒有顯式的調(diào)用入口，該如何調(diào)用調(diào)用這個方法呢胆建？

1.使用InitializingBean烤低，當(dāng)類被初始化時scheduleAtFixedRate被顯式調(diào)用：

public class ScheduleTask  implements InitializingBean,Runnable{
    @Override
    public void run() {
        System.out.println(  new Date() +"任務(wù)執(zhí)行");
    }

    @Override
    public void afterPropertiesSet() throws Exception {

        ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();
        // 第二個參數(shù)為首次執(zhí)行的延時時間，第三個參數(shù)為定時執(zhí)行的間隔時間
        service.scheduleAtFixedRate(this, 10, 1, TimeUnit.SECONDS);

    }
}

beans.xml:

<bean id="task"  class="com.alibaba.test.scheduling.ScheduleTask"/>

2. 使用 @Scheduled注解：

public class ScheduleTask{
    @Scheduled(fixedRate=1)
    public void run() {
        System.out.println(  new Date() +"任務(wù)執(zhí)行");
    }
}

XML配置：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:sofa="http://schema.alipay.com/sofa/schema/service"
    xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://schema.alipay.com/sofa/schema/service http://schema.alipay.com/sofa/sofa-service-4-0-0.xsd
         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"
    default-autowire="byName">
    <bean id="task"  class="com.alibaba.test.scheduling.ScheduleTask"/>
  <task:annotation-driven>
  </task:annotation-driven>
</beans>

當(dāng)然也可以指定定時任務(wù)線程池·笆载。

3.只使用使用XML配置：

public class ScheduleTask{

    public void run() {
        System.out.println(  new Date() +"任務(wù)執(zhí)行");
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:sofa="http://schema.alipay.com/sofa/schema/service"
    xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://schema.alipay.com/sofa/schema/service http://schema.alipay.com/sofa/sofa-service-4-0-0.xsd
         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"
    default-autowire="byName">
    <bean id="task"  class="com.alibaba.test.scheduling.ScheduleTask"/>
    <task:scheduler id="scheduler" pool-size="10"  />  <!--配置定時器-->
    <task:scheduled-tasks scheduler="scheduler">
        <task:scheduled ref="task" method="run" fixed-delay="1000" />
    </task:scheduled-tasks>
</beans>