1.EJB的HelloWorld!

        用Eclipse开发EJB需要用到EJB的类库，我用的是JBoss作服务器，因此可以把JBoss下的client文件夹下的所有jar文件加到项目路径中 ，就可以 了。

        接下来编写一个无状态会话Bean，代码如下：

package com.taoistwar.ejb;

public interface HelloWorld {
	public String sayHello(String name);
}

    以上定义了一个接口，名字是HelloWorld,有一个方法sayHello(String name)。

package com.taoistwar.ejb.impl;

import javax.ejb.Remote;
import javax.ejb.Stateless;

import com.taoistwar.ejb.HelloWorld;

@Stateless
@Remote(HelloWorld.class)
public class HelloWorldBean implements HelloWorld {

	@Override
	public String sayHello(String name) {
		return name + "说：你好世界！";
	}

}

      在上面的代码中，用@Stateless的Java注解来定义了HelloWorldBean为无状态会话Bean.用Remote(HelloWorld.class)的Java注解定义了远程接口为HelloWorld.class,不写的话默认的是本地接口？

        启动JBoss,把以上类打包，复制到JBoss下的%jboss_home%/server/default/deploy下，发布EJB应用。成功则出现如下信息：

 

 

20:31:01,093 INFO  [Ejb3DependenciesDeployer] Encountered deployment AbstractVFS
DeploymentContext@27360696{vfszip:/D:/software/jboss-5.0.0.GA/server/default/dep
loy/ejb.jar}
20:31:01,109 INFO  [Ejb3DependenciesDeployer] Encountered deployment AbstractVFS
DeploymentContext@27360696{vfszip:/D:/software/jboss-5.0.0.GA/server/default/dep
loy/ejb.jar}
20:31:02,062 INFO  [JBossASKernel] Created KernelDeployment for: ejb.jar
20:31:02,062 INFO  [JBossASKernel] installing bean: jboss.j2ee:jar=ejb.jar,name=
HelloWorldBean,service=EJB3
20:31:02,078 INFO  [JBossASKernel]   with dependencies:
20:31:02,078 INFO  [JBossASKernel]   and demands:
20:31:02,078 INFO  [JBossASKernel]      jboss.ejb:service=EJBTimerService
20:31:02,078 INFO  [JBossASKernel]   and supplies:
20:31:02,078 INFO  [JBossASKernel]      jndi:HelloWorldBean/remote-com.taoistwar
.ejb.HelloWorld
20:31:02,078 INFO  [JBossASKernel]      Class:com.taoistwar.ejb.HelloWorld
20:31:02,078 INFO  [JBossASKernel]      jndi:HelloWorldBean/remote
20:31:02,078 INFO  [JBossASKernel] Added bean(jboss.j2ee:jar=ejb.jar,name=HelloW
orldBean,service=EJB3) to KernelDeployment of: ejb.jar
20:31:02,468 INFO  [SessionSpecContainer] Starting jboss.j2ee:jar=ejb.jar,name=H
elloWorldBean,service=EJB3
20:31:02,500 INFO  [EJBContainer] STARTED EJB: com.taoistwar.ejb.impl.HelloWorld
Bean ejbName: HelloWorldBean
20:31:02,609 INFO  [JndiSessionRegistrarBase] Binding the following Entries in G
lobal JNDI:

        HelloWorldBean/remote - EJB3.x Default Remote Business Interface
        HelloWorldBean/remote-com.taoistwar.ejb.HelloWorld - EJB3.x Remote Busin
ess Interface

 

       注：上面的时间根据发布的时间不同，会有所区别