我正在开发Java桌面应用程序,并且对使用JavaFX非常感兴趣。我计划使用MVC架构,因为我对Java EE和MVC模型有一定的经验。
我想将数据存储在嵌入式derby数据库中,并使用Hibernate作为持久层,但是找不到关于使用hibernate和JavaFX实现MVC的出色教程。
我已经创建了持久性文件,但不确定如何使其与JavaFX一起使用。在Java EE中,我注入了EJB服务或DAO,但是由于我的应用程序未与服务器连接,所以我认为我不能这样做。
有人可以解释我如何实现这一目标吗?可以一起使用吗?
在我的最后一个JavaFX项目中,我在服务层下创建了一个DataBroker类,该类可以执行数据库上的所有CRUD操作。
例:
public class DataBroker { private EntityManager em; public DataBroker() { init(); } private void init() { this.em = Persistence.createEntityManagerFactory("<NAME_OF_YOUR_PU>").createEntityManager(); } public Person saveOrUpdate(Person entity) { em.getTransaction().begin(); T savedEntity = em.merge(entity); em.getTransaction().commit(); return savedEntity; } public List<Person> getAllPersons() { TypedQuery<Person> query = em.createNamedQuery(Person.GET_ALL, Person.class); return query.getResultList(); } }
如果仅需要一个DataBroker实例,则可以将其实现为Singleton,如果需要实例池,请创建一个池。这是Application Server的优势,他为您完成了所有这一切,您只需注释您的类或成员。
我希望这能帮到您。
编辑/更新 这是EclipseLink 2.1的一个有效示例,但它只是Persistence Provider,因此它也适用于Hibernate。
我像上面的示例中一样创建了一个DataBroker,它实现了IDataBroker接口并覆盖了方法。
IDataBroker
import de.professional_webworkx.crm.domain.Person; import java.util.List; public interface IDateBroker { public abstract void saveOrUpdate(Person person); public abstract List<Person> getAllPersons(); public abstract Person getPersonById(int id); public abstract Person getPersonByEmail(String email); }
DataBroker- 并非每种方法 都已 实现…
import de.professional_webworkx.crm.domain.Person; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.Persistence; /** * * @author Patrick Ott <Patrick.Ott@professional-webworkx.de> * @version 1.0 */ public class DataBroker implements IDateBroker { private EntityManager em; public DataBroker() { em = Persistence.createEntityManagerFactory("CRMPU").createEntityManager(); } @Override public void saveOrUpdate(Person person) { em.getTransaction().begin(); em.merge(person); em.getTransaction().commit(); } @Override public List<Person> getAllPersons() { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override public Person getPersonById(int id) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override public Person getPersonByEmail(String email) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } }
IPersonService接口
import de.professional_webworkx.crm.domain.Person; import java.util.List; public interface IPersonService { void saveOrUpdate(Person person); List<Person> getAllPersons(); Person getPersonById(int id); Person getPersonByEmail(String email); }
人员服务
import de.professional_webworkx.crm.databroker.DataBroker; import de.professional_webworkx.crm.databroker.IDateBroker; import de.professional_webworkx.crm.domain.Person; import java.util.List; public class PersonService implements IPersonService { private IDateBroker broker; public PersonService() { broker = new DataBroker(); } @Override public void saveOrUpdate(Person person) { broker.saveOrUpdate(person); } @Override public List<Person> getAllPersons() { return broker.getAllPersons(); } @Override public Person getPersonById(int id) { return broker.getPersonById(id); } @Override public Person getPersonByEmail(String email) { return broker.getPersonByEmail(email); } }
我们的领域类 人员
import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; import javax.validation.constraints.NotNull; import javax.validation.constraints.Size; @Entity @Table(name = "person") public class Person implements Serializable { private long id; private String firstName; private String lastName; private String eMail; public Person() { } public Person(String firstName, String lastName, String eMail) { this.firstName = firstName; this.lastName = lastName; this.eMail = eMail; } @Id @GeneratedValue(strategy = GenerationType.AUTO) public long getId() { return id; } public void setId(long id) { this.id = id; } @Size(min = 2, max = 255, message = "Enter between 2 and 255 characters!") @Column(name = "firstname") @NotNull public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } @Column(name = "lastname") @NotNull public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } @NotNull public String geteMail() { return eMail; } public void seteMail(String eMail) { this.eMail = eMail; } }
该 FXMLController 类
import de.professional_webworkx.crm.business.IPersonService; import de.professional_webworkx.crm.business.PersonService; import de.professional_webworkx.crm.domain.Person; import java.net.URL; import java.util.ResourceBundle; import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.control.Label; public class FXMLController implements Initializable { private IPersonService service; @FXML private Label label; @FXML private void handleButtonAction(ActionEvent event) { Person p = new Person("Demo", "User", "demo@example.com"); service.saveOrUpdate(p); } @Override public void initialize(URL url, ResourceBundle rb) { // get an instance of PersonService service = new PersonService(); } }
最后但并非最不重要的MainApp启动应用程序。
import javafx.application.Application; import static javafx.application.Application.launch; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage; public class MainApp extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("/fxml/Scene.fxml")); Scene scene = new Scene(root); scene.getStylesheets().add("/styles/Styles.css"); stage.setTitle("JavaFX and Maven"); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } }
这是使用Netbeans 8创建的标准Maven JavaFX项目。如有必要,我可以将Sources上传到GitHub或其他东西。
数据库表将在第一次提交时创建,因为我在persistence.xml文件中进行了设置,从文件中可以看到该模式生成
<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> <persistence-unit name="CRMPU" transaction-type="RESOURCE_LOCAL"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <class>de.professional_webworkx.crm.domain.Person</class> <properties> <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/exampleDb?zeroDateTimeBehavior=convertToNull"/> <property name="javax.persistence.jdbc.user" value="user"/> <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/> <property name="javax.persistence.jdbc.password" value="pass"/> <property name="javax.persistence.schema-generation.database.action" value="create"/> </properties> </persistence-unit> </persistence>
因此,我希望这将有助于您创建项目。
帕特里克