Eclipse4.2+Jboss7/Jboss-eap-6.0+EJB3.1分布式开发 第三篇

第三篇（EJB Client端的开发）

1. 建立一个Dynamic Web Project，项目名称为EJBClient。项目结构为：
   
2. 还记得上一篇中给Server端的项目添加Maven支持了吗，这里就用到了。右键那个项目->run as->maven build...,run 完之后你就可以在项目根目录的target下面找到此项目打成的jar包了。 E:\project\J2EE\MyEJBServer\target\MyEJBServer-0.0.1-SNAPSHOT.jar
   

   [INFO] Scanning for projects...
   [INFO] ------------------------------------------------------------------------
   [INFO] Building MyEJBServer
   [INFO]    task-segment: [package]
   [INFO] ------------------------------------------------------------------------
   [INFO] [resources:resources {execution: default-resources}]
   [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
   [INFO] Copying 1 resource
   [INFO] [compiler:compile {execution: default-compile}]
   [INFO] Nothing to compile - all classes are up to date
   [INFO] [resources:testResources {execution: default-testResources}]
   [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
   [INFO] skip non existing resourceDirectory E:\project\J2EE\MyEJBServer\src\test\resources
   [INFO] [compiler:testCompile {execution: default-testCompile}]
   [INFO] Not compiling test sources
   [INFO] [surefire:test {execution: default-test}]
   [INFO] Tests are skipped.
   [INFO] [ejb:ejb {execution: default-ejb}]
   [INFO] Building EJB MyEJBServer-0.0.1-SNAPSHOT with EJB version 3.1
   [INFO] Building jar: E:\project\J2EE\MyEJBServer\target\MyEJBServer-0.0.1-SNAPSHOT.jar
   [INFO] ------------------------------------------------------------------------
   [INFO] BUILD SUCCESSFUL
   [INFO] ------------------------------------------------------------------------
   [INFO] Total time: 3 seconds
   [INFO] Finished at: Thu May 09 11:19:37 CST 2013
   [INFO] Final Memory: 11M/28M
   [INFO] ------------------------------------------------------------------------
   

3. 把这个jar包引入到此项目的build path中
   
4. 开发EJBUtil用来获取EJB

   package com.synnex.ejb.util;
   
   import java.util.Properties;
   
   import javax.naming.Context;
   import javax.naming.InitialContext;
   import javax.naming.NamingException;
   
   public class EjbUtil {
   	private static Context initialContext;
   	
   	private static final String PKG_INTERFACES = "org.jboss.ejb.client.naming";
   	
   	private static Context getInitialContext() throws NamingException{
   		if(initialContext == null){
   			Properties prop = new Properties();
   			prop.put(Context.URL_PKG_PREFIXES, PKG_INTERFACES);
   			
   			initialContext = new InitialContext(prop);
   		}
   		
   		return initialContext;
   	}
   	
   	public static Object lookup(String jndi) throws Exception{
   		return getInitialContext().lookup(jndi);
   	}
   	
   	private static Object lookup(Class<?> serviceClass, String moduleName, String beanName) throws Exception {
           final String appName = "";			//ear包的名字，如果没有ear包，那么这个就是空字符串就行
           final String distinctName = "";
           
           final String interfaceName = serviceClass.getName();
           
           String jndi = "ejb:" + appName + "/" + moduleName + "/" + distinctName + "/" + beanName + "!" + interfaceName;
           
           System.out.println("JNDI: " + jndi);
   
   		return getInitialContext().lookup(jndi);
       }
   	
   	public static Object lookupRemoteBizService(Class<?> serviceClass, String moduleName) throws Exception{
   		String beanName = serviceClass.getSimpleName().replace("Remote", "");
   		return lookup(serviceClass, moduleName, beanName);
   	}
   }
   

    
5. 开发Servlet用来作为程序的入口点

   package com.synnex.servlet;
   
   import java.io.IOException;
   
   import javax.servlet.ServletException;
   import javax.servlet.annotation.WebServlet;
   import javax.servlet.http.HttpServlet;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
   import com.hua.ejb.LoginBeanRemote;
   import com.synnex.ejb.util.EjbUtil;
   
   /**
    * Servlet implementation class TestRemoteEJB
    */
   @WebServlet("/TestRemoteEJB")
   public class TestRemoteEJB extends HttpServlet {
   	private static final long serialVersionUID = 1L;
          
       /**
        * @see HttpServlet#HttpServlet()
        */
       public TestRemoteEJB() {
           super();
           // TODO Auto-generated constructor stub
       }
   
   	/**
   	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   	 */
   	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		this.doPost(request, response);
   	}
   
   	/**
   	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   	 */
   	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		try {
   			LoginBeanRemote loginBean = (LoginBeanRemote)EjbUtil.lookupRemoteBizService(LoginBeanRemote.class, "MyEJBServer");
   			System.out.println(loginBean.login("ejb", "123456"));
   			System.out.println(loginBean.login("ejb", "qwerty"));
   		} catch (Exception e) {
   			e.printStackTrace();
   		}
   	}
   
   }
   

    
6. 拷贝EJB server端程序的jar包到Client 的Jboss Server的modules下面。目录位置D:\server\jboss-eap-6.0\modules\com\huag\ejb\main，然后添加module.xml。
   
    

   <module xmlns="urn:jboss:module:1.1" name="com.huag.ejb">
       <resources>
           <resource-root path="MyEJBServer-0.0.1-SNAPSHOT.jar"/>
       </resources>
       <dependencies>
       </dependencies>
   </module>

7. 为项目部署到jboss7下面，添加jboss-deployment-structure.xml，到WEB-INF下面。

   <jboss-deployment-structure>
      <deployment>
         <dependencies>
         	<module name="com.huag.ejb" />
         </dependencies>
      </deployment>
   </jboss-deployment-structure>

      
   
8. 发布项目到Jboos，然后启动JBoss，看是否能够启动成功。

    下一篇为最终篇，我们将讲解Client Server的配置和展示分布式调用。