jee6 学习笔记 6 - EJB3.1 What's New

最新推荐文章于 2021-03-12 10:49:25 发布

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#EJB3.1 #new features

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本文简要介绍了EJB3.1的一些新特性，包括无接口的@Stateless注解使用、@Singleton注解创建单例EJB、定时服务通过@Schedule实现、异步EJB的@Asynchronous注解应用以及将EJB打包为war文件的方法。

The following is a brief list of the new features of EJB3.1

1. no interface required


@Stateless
public class MyEjb { ...}

2. singleton EJB: @Singleton


@Singleton
public class MySingleton { ... }

3. timer based services: @Schedule


@Stateless
public class MyTimerBean {
 @Schedule(dayOfWeek="Sun", hour="0")
 public void soSomething() { ... }
}

4. Asynchronous EJB: @Asynchronous


@Stateless
public class MyAsynchBean  {
  @Asynchronous
  public void doSomething(User u) {
    try {
      changeSomething(u);
      sendNotification(u);
   }
   catch (Exception e) {
     e.printStackTrace();
   } 
  }
}

5. As showed in the previous blogs, EJBs can now be packaged in a web archive .war

Next, i'll do simple experiments on these new features to make sure i really understand how they work, and possibly, how they can be used.