EJB3.0暴露會話EJB作為Web服務提供選項。@WebService注釋是用來標記一類作為一個Web服務端點，並使用@WebMethod是用來作為客戶端的Web方法的公開方法。

@Stateless
@WebService(serviceName="LibraryService")
public class LibraryPersistentBean implements LibraryPersistentBeanRemote {
	
   ...
   @WebMethod(operationName="getBooks")
   public List<Book> getBooks()  {    
      return entityManager.createQuery("From Books").getResultList();
   }
   ...
}

示例應用程序

讓我們創建一個測試EJB在EJB3.0應用程序來測試BLOB/CLOB支持。

Step	Description
1	Create a project with a name EjbComponent under a package com.tutorialspoint.entity as explained in the EJB - Create Application chapter. Please use the project created in EJB - Persistence chapter as such for this chapter to understand clob/blob objects in ejb concepts.
2	Create LibraryPersistentBean.java under package com.tutorialspoint.stateless. Use EJB - Persistence chapter as reference. Keep rest of the files unchanged.
3	Clean and Build the application to make sure business logic is working as per the requirements.
4	Finally, deploy the application in the form of jar file on JBoss Application Server. JBoss Application server will get started automatically if it is not started yet.

LibraryPersistentBean.java

package com.tutorialspoint.stateless;

import com.tutorialspoint.entity.Book;
import java.util.List;
import javax.ejb.Stateless;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Stateless
@WebService(serviceName="LibraryService")
public class LibraryPersistentBean implements LibraryPersistentBeanRemote {
    
   public LibraryPersistentBean(){
   }

   @PersistenceContext(unitName="EjbComponentPU")
   private EntityManager entityManager;         

   public void addBook(Book book) {
      entityManager.persist(book);
   }    
   
   @WebMethod(operationName="getBooks")
   public List<Book> getBooks() {
      return entityManager.createQuery("From Book").getResultList();
   }
}

JBoss應用服務器的日誌輸出

10:51:37,271 INFO  [EJBContainer] STARTED EJB: com.tutorialspoint.stateless.LibraryPersistentBean ejbName: LibraryPersistentBean
10:51:37,287 INFO  [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:

	LibraryPersistentBean/remote - EJB3.x Default Remote Business Interface
	LibraryPersistentBean/remote-com.tutorialspoint.stateless.LibraryPersistentBeanRemote - EJB3.x Remote Business Interface

10:51:37,349 INFO  [EJBContainer] STARTED EJB: com.tuturialspoint.messagebean.LibraryMessageBean ejbName: BookMessageHandler
10:51:37,443 INFO  [DefaultEndpointRegistry] register: jboss.ws:context=EjbComponent,endpoint=LibraryPersistentBean
10:51:38,191 INFO  [WSDLFilePublisher] WSDL published to: file:/D:/Jboss-5.0.1/server/default/data/wsdl/EjbComponent.jar/
LibraryService3853081455302946642.wsdl

創建客戶端訪問EJB作為Web服務

在NetBeansIDE中，選擇File>NewProject>類彆下選擇項目類型，Java項目類型為Java應用。點擊Next>按鈕。輸入項目的名稱和位置。單擊“Next>“按鈕。我們選擇名為EJBWebServiceClient。

右鍵點擊項目名稱在項目exporer窗口中。選擇 New > WebService Client .

添加EJB組件項目的LibraryPersistentBean早下創建WSDL和客戶端位置使用在"編譯"選項卡中添加項目“按鈕。

單擊“完成”按鈕。在項目資源管理器驗證以下結構。

Create EJBWebServiceClient.java

package ejbwebserviceclient;

public class EJBWebServiceClient {
   public static void main(String[] args) {   
   }
}

如下圖所示，選擇Web服務getBooks Web方法，將其拖動到代碼窗口EJBWebServiceClient。

會看到類似的輸出如下所示。

更新EJBWebServiceClient的代碼使用此方法。

package ejbwebserviceclient;

public class EJBWebServiceClient {

   public static void main(String[] args) {
      for(com.tutorialspoint.stateless.Book book:getBooks()){
         System.out.println(book.getName());
      }       
   }

   private static java.util.List
   <com.tutorialspoint.stateless.Book> getBooks() {
      com.tutorialspoint.stateless.LibraryService service = 
         new com.tutorialspoint.stateless.LibraryService();
      com.tutorialspoint.stateless.LibraryPersistentBean port = 
         service.getLibraryPersistentBeanPort();
      return port.getBooks();
   }      
}

運行客戶端

右鍵點擊項目名稱，項目資源管理器窗口。選擇“Run”。 NetBeans將生成客戶端並運行它。驗證下麵的輸出。 

ant -f D:\SVN\EJBWebServiceClient run
init:
Deleting: D:SVNEJBWebServiceClientuilduilt-jar.properties
deps-jar:
Updating property file: D:SVNEJBWebServiceClientuilduilt-jar.properties
wsimport-init:
wsimport-client-LibraryPersistentBean:
files are up to date
classLoader = java.net.URLClassLoader@4ce46c
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@182cdac
wsimport-client-generate:
Compiling 1 source file to D:SVNEJBWebServiceClientuildclasses
compile:
run:
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BUILD SUCCESSFUL (total time: 1 second)