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EJB 3.0 开发指南之定时服务_MySQL

Jun 01, 2016 pm 02:06 PM
import timing develop guide document Serve

EJB

  在EJB2.1的规范中需要实现ejbTimeout方法,当然还有ejbPassivate、ejbRemove等方法。在EJB3.0中,只有你想用它们的时候,你才必须创建它们,否则不必实现。

  这个例子主要有5个文件,这个例子的Bean是一个无状态会话Bean:

  NewsTimer.java:业务接口。

  NewsTimer.java:业务实现类。将来我们开发的EJB也都是这样命名(在接口名上加上Bean)。

  Client.java:测试EJB的客户端类。

  jndi.properties:jndi属性文件,提供访问jdni的基本配置属性。

  Build.xml:ant 配置文件,用以编译、发布、测试、清除EJB。

  下面针对每个文件的内容做一个介绍。

  NewsTimer.java

  package com.kuaff.ejb3.schedule;
  import javax.ejb.Remote;
  @Remote

  public interface NewsTimer
  {
  public void fiveNews();
  }

  这个接口定义了fiveNews方法,如果这个方法被调用,5分钟后将往控制台上输出一条新闻。

  你不必配置它的JNDI名称,也不必写它的配置文件。在JBOSS实现的EJB3.0中,你不必写任何的EJB部署文件和jboss部署文件。JBOSS默认使用接口的全称作为它的JNDI名。在上面的例子中,它的全称可以通过NewsTimerclass.forName()得到。

  NewsTimerBean.java

  package com.kuaff.ejb3.schedule;
  import java.util.Date;
  import javax.ejb.Inject;
  import javax.ejb.SessionContext;
  import javax.ejb.Stateless;
  import javax.ejb.Timer;

  @Stateless

  public class NewsTimerBean implements NewsTimer
  {
  private @Inject SessionContext ctx;
  public void fiveNews()
  {
  ctx.getTimerService().createTimer(new Date(new Date().getTime() + 300000), "子虚乌有电视台5分钟新闻栏目:现在过5分钟,又到即时新闻节目的时间了。");
  }

  public void ejbTimeout(Timer timer)
  {
  System.out.printf("时间到:%n%s%n" , timer.getInfo());
  timer.cancel();
  }
  }

  Client.java

  package com.kuaff.ejb3.schedule;

  import javax.naming.InitialContext;
  import javax.naming.NamingException;

  public class Client
  {
  public static void main(String[] args) throws NamingException
  {
  InitialContext ctx = new InitialContext();
  NewsTimer timer = (NewsTimer) ctx.lookup(NewsTimer.class.getName());
  timer.fiveNews();
  }
  }

  这个类用来测试我们发布的计数器EJB。首先通过

  ctx = new InitialContext();

  得到上下文,然后通过lookup查找NewsTimer,然后启动计时。。

  请运行{$JBOSS_HOME}/bin目录下的run.bat: run

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