EJB Web Services
EJB3.0暴露会话EJB作为Web服务提供选项。@WebService注释是用来标记一类作为一个Web服务端点,并使用@WebMethod是用来作为客户端的Web方法的公开方法。
@Stateless @WebService(serviceName="LibraryService") public class LibraryPersistentBean implements LibraryPersistentBeanRemote { ... @WebMethod(operationName="getBooks") public List<Book> getBooks() { return entityManager.createQuery("From Books").getResultList(); } ... }
示例应用程序
让我们创建一个测试EJB在EJB3.0应用程序来测试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应用服务器的日志输出
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
创建客户端访问EJB作为Web服务
在NetBeansIDE中,选择File>NewProject>类别下选择项目类型,Java项目类型为Java应用。点击Next>按钮。输入项目的名称和位置。单击“Next>“按钮。我们选择名为EJBWebServiceClient。
右键点击项目名称在项目exporer窗口中。选择 New > WebService Client .
添加EJB组件项目的LibraryPersistentBean早下创建WSDL和客户端位置使用在"编译"选项卡中添加项目“按钮。
单击“完成”按钮。在项目资源管理器验证以下结构。
Create EJBWebServiceClient.java
package ejbwebserviceclient; public class EJBWebServiceClient { public static void main(String[] args) { } }
如下图所示,选择Web服务getBooks Web方法,将其拖动到代码窗口EJBWebServiceClient。
会看到类似的输出如下所示。
更新EJBWebServiceClient的代码使用此方法。
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(); } }
运行客户端
右键点击项目名称,项目资源管理器窗口。选择“Run”。 NetBeans将生成客户端并运行它。验证下面的输出。
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: 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)