使用 Eclipse 开发 J2EE 应用、使用 Eclipse 开发 EJB
在第二部分"使用 Eclipse 开发 Web 应用"中，我们已经在 TestJ2EE 这个 J2EE 项目中添加了一个名为 MyEJB 的 EJB 模块。下面我们通过 Lomboz EJB Creation Wizard 向 MyEJB 模块中添加一个 Session Bean。
点击 File->New->Lomboz EJB Creation Wizard，或者右击 MyEJB 模块，选择 New->Lomboz EJB Creation Wizard，显示出如下对话框：
在 com.dino.testj2ee.myejb 这个包下面创建一个名为 MyEJB 的 Stateless Session Bean。完成以后，在 TestJ2EE 项目的 src 文件夹下面，出现了一个名为 MyEJBBean.java 的文件，右击这个文件，选择 New->Lomboz EJB Method Wizard，可以给这个 EJB 添加各种方法。我添加了一个 helloWorld 方法，返回一个 String 类型。如下图所示：
然后，需要把 MyEJB 这个 Session Bean 添加到 MyEJB 这个模块上面：右击 MyEJB.java，选择 Lomboz J2EE … ->Add EJB to Module，选择 MyEJB，OK。
右击 MyEJB 模块，选择 LombozJ2EE … ->Generate EJB Classes，这样就在 ejbsrc 目录下面自动生成了下面几个文件：
MyEJBHome.java
MyEJBRome.java
MyEJBLocalHome.java
MyEJBLocal.java
MyEJBSession.java (MyEJBSession extends MyEJBBean)
MyEJBUtil.java
Build project 以后，自动将模块打包完毕。接着就可以按照部署 Web 模块的步骤来部署 EJB 模块了。
最后，我们建立一个应用程序来测试 EJB。
通过 File->New->Lomboz EJB Test Client Wizard 打开一个对话框，按下图填写：
完成以后，在 src 目录下面生成了 TestMyEJB.java，在其中的 testBean 方法中加入测试代码：
System.out.println(myBean.helloWorld()); |
如果目前 JBoss 服务器已经启动，而且 MyEJB 模块已经部署的话，执行 TestMyEJB，就会在 Console 窗口上显示出：
hehe, I can deploy EJB by Eclipse! |
四、总结
通过以上的介绍，我们了解到，Lomboz 使 Eclipse 开发 J2EE 应用变得非常简便，而且 Eclipse, Lomboz, JBoss 这些工具都是免费和开放源码的项目，所以这样的组合对 Java 开发者来说更有吸引力。
对于开发复杂的 J2EE 应用来说，上面的介绍可能还不够全面，希望大家在做项目的过程中体会，再将总结出来的经验放到 developerWorks 上来分享。
附录：JBoss320.server
<serverDefinition name="JBOSS 3.2"
ejbModules="true" webModules="true" earModules="true">
<property id="serverRootDirectory" label="Application Server Directory:"
type="directory" default="D:/jboss-3.2.0" />
<property id="serverAddress" label="Address:"
type="string" default="127.0.0.1" />
<property id="serverPort" label="Port:"
type="string" default="8080" />
<property id="classPathVariableName" label="Classpath Variable Name:"
type="string" default="JBOSS32" />
<property id="classPath" label="Classpath Variable:"
type="directory" default="D:/jboss-3.2.0" />
<serverHome>${serverRootDirectory}</serverHome>
<webModulesDeployDirectory>${serverRootDirectory}/server/all/deploy
</webModulesDeployDirectory>
<ejbModulesDeployDirectory>${serverRootDirectory}/server/all/deploy
</ejbModulesDeployDirectory>
<earModulesDeployDirectory>${serverRootDirectory}/server/all/deploy
</earModulesDeployDirectory>
<jndiInitialContextFactory>org.jnp.interfaces.NamingContextFactory
</jndiInitialContextFactory>
<jndiProviderUrl>jnp://${serverAddress}:1099</jndiProviderUrl>
<startClass>org.jboss.Main</startClass>
<startWorkingDirectory>${serverRootDirectory}/bin
</startWorkingDirectory>
<startVmParameters></startVmParameters>
<startProgramArguments>-c all</startProgramArguments>
<stopClass>org.jboss.Shutdown</stopClass>
<stopWorkingDirectory>${serverRootDirectory}/bin
</stopWorkingDirectory>
<stopVmParameters></stopVmParameters>
<stopProgramArguments>${serverAddress} ${serverPort}
</stopProgramArguments>
<serverClassPath>
<jar type="variable">JDK_TOOLS</jar>
<jar type="variable">${classPathVariableName}/bin/run.jar
</jar>
<jar type="variable">${classPathVariableName}/bin/shutdown.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jboss-j2ee.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/javax.servlet.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/commons-httpclient.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/concurrent.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/getopt.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/jboss-boot.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/jboss-common.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/jboss-jmx.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/jboss-system.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/jdom.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/log4j-boot.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/webdavlib.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/xercesImpl.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/xml-apis.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jnet.jar
</jar>
<jar type="variable">${classPathVariableName}/lib/gnu-regexp.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jboss.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jnpserver.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jpl-util.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jpl-pattern.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jsse.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jbossha.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jboss-jaas.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jts.jar
</jar>
<jar type="variable">
${classPathVariableName}/server/all/lib/jboss-transaction.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/javagroups-2.0.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jmxri.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jmxtools.jar
</jar>
<jar type="variable">${classPathVariableName}/server/all/lib/jbossmx.jar
</jar>
</serverClassPath>
<clientClassPath>
<jar type="variable">${classPathVariableName}/client/jboss-j2ee.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jnp-client.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jboss-client.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jboss-common-client.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jbosssx-client.jar
</jar>
<jar type="variable">${classPathVariableName}/client/log4j.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jnet.jar
</jar>
<jar type="variable">${classPathVariableName}/client/jaas.jar
</jar>
</clientClassPath>
</serverDefinition>
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参考资料
- www.eclipse.org Eclipse 的官方网站；
- www.jboss.org JBoss 的官方网站；
- www.objectlearn.com Lomboz 的网站，上面有关于 Lomboz 的教程。
- Eclipse in Action: A Guide for Web Developers, by David Gallardo, Ed Burnette and Robert McGovern, Manning Publications. 一本介绍使用 Eclipse 开发的好书。
- JBoss 3.0: Quick Start Guide, by JBoss Group. 一本关于 JBoss 入门的好书。