創建專案
在NetBeans IDE中，選擇File > New Project >. 可以看到如下圖.
在類別中選擇專案類型，Java EE的EJB模組專案類型。點擊Next>按鈕，你會看到以下的畫面。
輸入專案的名稱和位置。點擊Next>按鈕。你會看到以下的畫面。
選擇伺服器為JBoss應用伺服器。單擊“Finish”按鈕。你會看到以下由NetBeans創建的專案。
創建一個簡單的EJB
要創建一個簡單的EJB，我們將使用NetBeans“New”嚮導。在下面的例子中，我們將在EjbComponent專案下創建一個無狀態EJB類名為librarySessionBean。
在專案資源管理器窗口中選擇專案EjbComponent，右鍵單擊它。選擇New > Session Bean。您將看到新的會話Bean嚮導。
輸入會話bean的名稱和包名。單擊“Finish ”按鈕。你會看到以下由NetBeans創建的EJB類。
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LibrarySessionBean - 無狀態會話bean
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LibrarySessionBeanLocal - 本地介面的會話bean
要改變本地介面，我們要一個基於控制臺的應用程式訪問我們的EJB遠程介面。遠程/本地介面用於公開一個EJB的業務方法實現。
LibrarySessionBeanLocal更名為LibrarySessionBeanRemote和LibrarySessionBean實現LibrarySessionBeanRemote介面。
LibrarySessionBeanRemote
package com.tutorialspoint.stateless; import java.util.List; import javax.ejb.Remote; @Remote public interface LibrarySessionBeanRemote { void addBook(String bookName); List getBooks(); }
LibrarySessionBean
package com.tutorialspoint.stateless; import java.util.ArrayList; import java.util.List; import javax.ejb.Stateless; @Stateless public class LibrarySessionBean implements LibrarySessionBeanRemote { List<String> bookShelf; public LibrarySessionBean(){ bookShelf = new ArrayList<String>(); } public void addBook(String bookName) { bookShelf.add(bookName); } public List<String> getBooks() { return bookShelf; } }
構建專案
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在Project Explorer窗口中選擇EjbComponent專案。
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右鍵點擊它來打開上下文菜單。
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選擇 clean and build。
在NetBeans控制臺輸出，你會看到以下的輸出。
ant -f C:\EJB\EjbComponent clean dist init: undeploy-clean: deps-clean: Deleting directory C:EJBEjbComponentuild Deleting directory C:EJBEjbComponentdist clean: init: deps-jar: Created dir: C:EJBEjbComponentuildclasses Copying 3 files to C:EJBEjbComponentuildclassesMETA-INF Created dir: C:EJBEjbComponentuildempty Created dir: C:EJBEjbComponentuildgenerated-sourcesap-source-output Compiling 2 source files to C:EJBEjbComponentuildclasses warning: [options] bootstrap class path not set in conjunction with -source 1.6 Note: C:EJBEjbComponentsrcjavacom utorialspointstateless LibraryPersistentBean.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 warning compile: library-inclusion-in-archive: Created dir: C:EJBEjbComponentdist Building jar: C:EJBEjbComponentdistEjbComponent.jar dist: BUILD SUCCESSFUL (total time: 3 seconds)
啟動應用程式伺服器
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伺服器在服務窗口下選擇JBoss應用伺服器。
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右鍵點擊它來打開上下文菜單。
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選擇start。
你會看到下麵的輸出在NetBeans中JBoss應用伺服器下的輸出。
Calling C:jboss-5.1.0.GAin un.conf.bat ========================================================================= JBoss Bootstrap Environment JBOSS_HOME: C:jboss-5.1.0.GA JAVA: C:Program Files (x86)Javajdk1.6.0_21injava JAVA_OPTS: -Dprogram.name=run.bat -Xms128m -Xmx512m -server CLASSPATH: C:jboss-5.1.0.GAin un.jar ========================================================================= 16:25:50,062 INFO [ServerImpl] Starting JBoss (Microcontainer)... 16:25:50,062 INFO [ServerImpl] Release ID: JBoss [The Oracle] 5.1.0.GA (build: SVNTag=JBoss_5_1_0_GA date=200905221634) ... 16:26:40,420 INFO [TomcatDeployment] deploy, ctxPath=/admin-console 16:26:40,485 INFO [config] Initializing Mojarra (1.2_12-b01-FCS) for context '/admin-console' 16:26:42,362 INFO [TomcatDeployment] deploy, ctxPath=/ 16:26:42,406 INFO [TomcatDeployment] deploy, ctxPath=/jmx-console 16:26:42,471 INFO [Http11Protocol] Starting Coyote HTTP/1.1 on http-127.0.0.1-8080 16:26:42,487 INFO [AjpProtocol] Starting Coyote AJP/1.3 on ajp-127.0.0.1-8009 16:26:42,493 INFO [ServerImpl] JBoss (Microcontainer) [5.1.0.GA (build: SVNTag=JBoss_5_1_0_GA date=200905221634)] Started in 52s:427ms
部署專案
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在Project Explorer窗口中選擇EjbComponent專案。
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右擊它，打開上下文菜單。
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選擇 Deploy.
在NetBeans控制臺輸出，你會看到下麵的輸出。
ant -f C:\EJB\EjbComponent -DforceRedeploy=true -Ddirectory.deployment.supported=false -Dnb.wait.for.caches=true run init: deps-jar: compile: library-inclusion-in-archive: Building jar: C:EJBEjbComponentdistEjbComponent.jar dist-directory-deploy: pre-run-deploy: Checking data source definitions for missing JDBC drivers... Distributing C:EJBEjbComponentdistEjbComponent.jar to [org.jboss.deployment.spi.LocalhostTarget@1e4f84ee] Deploying C:EJBEjbComponentdistEjbComponent.jar Applicaton Deployed Operation start started Operation start completed post-run-deploy: run-deploy: run: BUILD SUCCESSFUL (total time: 2 seconds)
JBoss應用伺服器的日誌輸出
16:30:00,963 INFO [DeployHandler] Begin start, [EjbComponent.jar]
...
16:30:01,233 INFO [Ejb3DependenciesDeployer] Encountered deployment AbstractVFSDeploymentContext@12038795{vfszip:/C:/jboss-5.1.0.GA/server/default/deploy/EjbComponent.jar/}
...
16:30:01,281 INFO [JBossASKernel] jndi:LibrarySessionBean/remote-com.tutorialspoint.stateless.LibrarySessionBeanRemote
16:30:01,281 INFO [JBossASKernel] Class:com.tutorialspoint.stateless.LibrarySessionBeanRemote
16:30:01,281 INFO [JBossASKernel] jndi:LibrarySessionBean/remote
16:30:01,281 INFO [JBossASKernel] Added bean(jboss.j2ee:jar=EjbComponent.jar,name=
LibrarySessionBean,service=EJB3) to KernelDeployment of: EjbComponent.jar
16:30:01,282 INFO [JBossASKernel] installing bean: jboss.j2ee:jar=EjbComponent.jar,name=BookMessageHandler,service=EJB3
16:30:01,282 INFO [JBossASKernel] with dependencies:
16:30:01,282 INFO [JBossASKernel] and demands:
16:30:01,282 INFO [JBossASKernel] jboss.ejb:service=EJBTimerService
...
16:30:01,283 INFO [EJB3EndpointDeployer] Deploy AbstractBeanMetaData@5497cb{name=jboss.j2ee:jar=EjbComponent.jar, name=LibrarySessionBean, service=EJB3_endpoint bean=org.jboss.ejb3.endpoint.deployers.impl.EndpointImpl properties=[container] constructor=null autowireCandidate=true}
...
16:30:01,394 INFO [SessionSpecContainer] Starting jboss.j2ee:jar=EjbComponent.jar,name=LibrarySessionBean,service=EJB3
16:30:01,395 INFO [EJBContainer] STARTED EJB: com.tutorialspoint.stateless.LibrarySessionBean ejbName: LibrarySessionBean
16:30:01,401 INFO [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:
LibrarySessionBean/remote - EJB3.x Default Remote Business Interface
LibrarySessionBean/remote-com.tutorialspoint.stateless.LibrarySessionBeanRemote - EJB3.x Remote Business Interface
16:30:02,723 INFO [SessionSpecContainer] Starting jboss.j2ee:jar=EjbComponent.jar,name=LibrarySessionBean,service=EJB3
16:30:02,723 INFO [EJBContainer] STARTED EJB: com.tutorialspoint.stateless.LibrarySessionBean ejbName: LibrarySessionBean
16:30:02,731 INFO [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:
LibrarySessionBean/remote - EJB3.x Default Remote Business Interface
LibrarySessionBean/remote-com.tutorialspoint.stateless.LibrarySessionBeanRemote - EJB3.x Remote Business Interface
創建客戶端訪問EJB
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在NetBeans IDE中選擇 File > New Project >.
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類別下選擇專案類型為Java，專案類型為Java應用程式的Java。點擊Next>按鈕。
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輸入專案的名稱和位置。單擊“Finish >“按鈕。我們選擇名為EjbTester。
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右鍵點擊專案名稱(在Project explore窗口中)。選擇屬性properties。
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添加EJB組件專案的庫使用“Add Project ”按鈕，在compile選項卡下創建的。
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添加JBoss庫使用添加Add jar/folder按鈕，在compile選項卡。 Jboss的庫可以位於<JBOSS安裝檔夾>客戶端檔夾。
在工程中創建 jndi.properties說一個句話 EjbTester.
jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost
創建包com.tutorialspoint.test和EJBTester.java類在下面。
EJBTester.java
package com.tutorialspoint.test; import com.tutorialspoint.stateless.LibrarySessionBeanRemote; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.util.List; import java.util.Properties; import javax.naming.InitialContext; import javax.naming.NamingException; public class EJBTester { BufferedReader brConsoleReader = null; Properties props; InitialContext ctx; { props = new Properties(); try { props.load(new FileInputStream("jndi.properties")); } catch (IOException ex) { ex.printStackTrace(); } try { ctx = new InitialContext(props); } catch (NamingException ex) { ex.printStackTrace(); } brConsoleReader = new BufferedReader(new InputStreamReader(System.in)); } public static void main(String[] args) { EJBTester ejbTester = new EJBTester(); ejbTester.testStatelessEjb(); } private void showGUI(){ System.out.println("**********************"); System.out.println("Welcome to Book Store"); System.out.println("**********************"); System.out.print("Options 1. Add Book 2. Exit Enter Choice: "); } private void testStatelessEjb(){ try { int choice = 1; LibrarySessionBeanRemote libraryBean = (LibrarySessionBeanRemote)ctx.lookup("LibrarySessionBean/remote"); while (choice != 2) { String bookName; showGUI(); String strChoice = brConsoleReader.readLine(); choice = Integer.parseInt(strChoice); if (choice == 1) { System.out.print("Enter book name: "); bookName = brConsoleReader.readLine(); libraryBean.addBook(bookName); }else if (choice == 2) { break; } } List<String> booksList = libraryBean.getBooks(); System.out.println("Book(s) entered so far: " + booksList.size()); for (int i = 0; i < booksList.size(); ++i) { System.out.println((i+1)+". " + booksList.get(i)); } LibrarySessionBeanRemote libraryBean1 = (LibrarySessionBeanRemote)ctx.lookup("LibrarySessionBean/remote"); List<String> booksList1 = libraryBean1.getBooks(); System.out.println( "***Using second lookup to get library stateless object***"); System.out.println( "Book(s) entered so far: " + booksList1.size()); for (int i = 0; i < booksList1.size(); ++i) { System.out.println((i+1)+". " + booksList1.get(i)); } } catch (Exception e) { System.out.println(e.getMessage()); e.printStackTrace(); }finally { try { if(brConsoleReader !=null){ brConsoleReader.close(); } } catch (IOException ex) { System.out.println(ex.getMessage()); } } } }
運行客戶端訪問EJB
在project explorer中找到EJBTester.java。右鍵點擊上EJBTester類，並選擇“run file”。
在Netbeans控制臺驗證以下輸出。
run: ********************** Welcome to Book Store ********************** Options 1. Add Book 2. Exit Enter Choice: 1 Enter book name: Learn Java ********************** Welcome to Book Store ********************** Options 1. Add Book 2. Exit Enter Choice: 2 Book(s) entered so far: 1 1. Learn Java ***Using second lookup to get library stateless object*** Book(s) entered so far: 0 BUILD SUCCESSFUL (total time: 13 seconds)
在下面的章節中，我們將討論這個完整的EJB的多個層面應用程式。
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