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📜  EJB-Web服务

📅  最后修改于: 2020-11-16 06:28:15             🧑  作者: Mango

EJB 3.0提供了将会话EJB公开为Web服务的选项。 @WebService批注用于将类标记为Web服务端点，而@WebMethod用于将方法作为Web方法公开给客户端。

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

应用范例

让我们创建一个测试EJB应用程序，以测试EJB 3.0中的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  getBooks() {
      return entityManager.createQuery("From Book").getResultList();
   }
}

JBoss应用服务器日志输出

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

创建客户端以将EJB作为Web服务访问

在NetBeans IDE中，选择“文件”>“新建项目”>。在“类别Java” ，“项目类型”下将项目类型选择为Java Application 。单击下一步>按钮。输入项目名称和位置。单击完成>按钮。我们选择了名称作为EJBWebServiceClient。

在“项目资源管理器”窗口中右键单击项目名称。选择“新建”>“ WebService客户端” 。

WSDL客户端

使用“编译”选项卡中的“添加项目”按钮，添加WSDL和“客户端位置”下先前创建的EJB组件项目的LibraryPersistentBean。

Web服务Bean

单击完成按钮。在项目浏览器中验证以下结构。

Web服务Bean

创建EJBWebServiceClient.java

package ejbwebserviceclient;

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

选择Web Service getBooks Web方法，如下图所示，并将其拖动到EJBWebServiceClient的代码窗口。

Web服务方法拖动

您将看到类似于以下所示的输出。

拖动Web服务方法

更新EJBWebServiceClient代码以使用此方法。

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

在“项目资源管理器”窗口中右键单击项目名称。选择运行。 Netbeans将构建客户端并运行它。验证以下输出。

ant -f D:\\SVN\\EJBWebServiceClient run
init:
Deleting: D:\SVN\EJBWebServiceClient\build\built-jar.properties
deps-jar:
Updating property file: D:\SVN\EJBWebServiceClient\build\built-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:\SVN\EJBWebServiceClient\build\classes
compile:
run:
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test1
BUILD SUCCESSFUL (total time: 1 second)