EJB Web Services

EJB3.0暴露會話EJB作爲Web服務提供選項。@WebService註釋是用來標記一類作爲一個Web服務端點,並使用@WebMethod是用來作爲客戶端的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作爲Web服務

在NetBeansIDE中,選擇File>NewProject>類別下選擇項目類型,Java項目類型爲Java應用。點擊Next>按鈕。輸入項目的名稱和位置。單擊「Next>「按鈕。我們選擇名爲EJBWebServiceClient。

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

WSDL 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。

Web Service Bean

單擊「完成」按鈕。在項目資源管理器驗證以下結構。

Web Service Bean

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。

Web Service Method drag

會看到類似的輸出如下所示。

Web Service Method dragged

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。驗證下面的輸出。

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 = [email protected]
SharedSecrets.getJavaNetAccess()[email protected]
wsimport-client-generate:
Compiling 1 source file to D:SVNEJBWebServiceClientuildclasses
compile:
run:
learn java
Learn Spring
learn JSF
Learn HTML
Learn JBoss
Learn EJB
Learn Hibernate
Learn IBatis
Times Now
learn html5
Learn images
Learn Testing
Forbes
test1
BUILD SUCCESSFUL (total time: 1 second)