每30秒执行一次Java类的最简单方法是什么？

Question

我一直在阅读有关java/spring/hibernate的内容并通过"虚拟"示例工作,所以我告诉我的朋友为我推荐一些更难的东西,现在我被卡住了......这是我能想到的最简单的类

package spring.com.practice;

public class Pitcher {

    private String shout;

    public String getShout() {
        return shout;
    }

    public void setShout(String shout) {
        this.shout = shout;
    }

    public void voice()
    {
        System.out.println(getShout());
    }

}

通过voice()从spring bean 调用metod打印出来的最简单的方法是什么,并且每隔30秒重复一次就可以说,这是我到目前为止所得到的:

<bean id="simpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean">
    <property name="jobDetail" ref="jobSchedulerDetail" />
    <property name="startDelay" value="0" />
    <property name="repeatInterval" value="30" />
</bean>


<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
    <property name="schedulerName" value="pitcherScheduler" />
    <property name="triggers">
        <list>
            <ref bean="simpleTrigger" />
        </list>
    </property>
</bean>
 <bean id="pitcher" class="spring.com.practice.Pitcher">
 <property name="shout" value="I started executing..."></property>
 </bean>

是的,我正试图在Jboss 5上运行它,我正在用maven构建一个项目.

我得到了一些建议,现在我的应用程序上下文如下:

<?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:sched="http://www.springinaction.com/schema/sched"
   xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springinaction.com/schema/sched
       http://www.springinaction.com/schema/sched-1.0.xsd"
       default-lazy-init="true">

   <bean id="stuffDoer" class="spring.com.practice">
   <property name="shout" value="I'm executing"/>
   </bean>

  <sched:timer-job
       target-bean="stuffDoer"
       target-method="voice"
       interval="5000" 
       start-delay="1000"
       repeat-count="10" />

</beans>

这是我的web.xml:

<web-app id="simple-webapp" version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>spring app</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/conf/applicationContext.xml
</param-value>
    </context-param>
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/log4j.properties</param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.util.Log4jConfigListener
</listener-class>
    </listener>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
</listener-class>
    </listener>
</web-app>

现在我得到这个例外:

12:35:51,657 ERROR [01-SNAPSHOT]] Error configuring application listener of class org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

我没有意识到每隔30秒执行一次像hello world这样的事情就会很复杂

Answer 1

我不打算使用Quartz,这对于这么简单的事情来说太过分了.Java5自带调度程序,它已经足够好了.

在春季前3,这是最简单的方法:

<bean class="org.springframework.scheduling.concurrent.ScheduledExecutorFactoryBean">
    <property name="scheduledExecutorTasks">
        <list>
            <bean class="org.springframework.scheduling.concurrent.ScheduledExecutorTask">
                <property name="period" value="30000"/>
                <property name="runnable">
                    <bean class="org.springframework.scheduling.support.MethodInvokingRunnable">
                        <property name="targetObject" ref="pitcher"/>
                        <property name="targetMethod" value="voice"/>
                    </bean>
                </property>
            </bean>
        </list>
    </property>
</bean>

使用Spring 3,它可以非常简单:

@Scheduled(fixedRate=30000)
public void voice() {
    System.out.println(getShout());
}

和

<beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           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://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
           "> 

  <bean id="pitcher" class="spring.com.practice.Pitcher">
     <property name="shout" value="I started executing..."></property>
  </bean>

  <task:annotation-driven/>

</beans>