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 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。
StepDescription
1Create 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.
2Create LibraryPersistentBean.java under package com.tutorialspoint.stateless. Use EJB - Persistence chapter as reference. Keep rest of the files unchanged.
3Clean and Build the application to make sure business logic is working as per the requirements.
4Finally, 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 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。
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
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:
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test1
BUILD SUCCESSFUL (total time: 1 second)
(编辑：雷林鹏 来源：网络|侵删)
