JavaBeans - definizione. Che cos'è JavaBeans
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  3. JavaBeans

Cosa (chi) è JavaBeans - definizione


JavaBeans         
JavaBeans — классы в языке Java, написанные по определённым правилам. Они используются для объединения нескольких объектов в один ( — фасоль, кофейное зерно) для удобной передачи данных.
https://ru.wikipedia.org/wiki/JavaBeans
Enterprise JavaBeans         
  • {
  • @PersistenceContext(unitName = "PersistenceUnit")
  • private EntityManager entityManager;
  • public GalleryEAO() {
  • super(Gallery.class);
  • }
  • @Override
  • protected EntityManager getEntityManager() {
  • return entityManager;
  • }
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public List findAll() {
  • return namedQuery(Gallery.QUERY_FIND_ALL).getResultList();
  • }
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public Gallery findByName(String name) {
  • return namedQuery(Gallery.QUERY_FIND_BY_NAME)
  • .setParameter("name", name)
  • .getSingleResult();
  • }
  • }
  • == Пример Abstract EAO (Entity Access Object) ==
  • package org.test.eao;
  • import java.io.Serializable;
  • import javax.persistence.EntityManager;
  • import javax.persistence.Query;
  • import javax.persistence.TypedQuery;
  • import javax.persistence.criteria.CriteriaQuery;
  • import javax.persistence.criteria.Root;
  • public abstract class AbstractEAO {
  • protected abstract EntityManager getEntityManager();
  • private Class entityClass;
  • public Class getEntityClass() {
  • return entityClass;
  • }
  • public AbstractEAO(Class entityClass) {
  • this.entityClass = entityClass;
  • }
  • public void persist(T entity) {
  • getEntityManager().persist(entity);
  • }
  • public void merge(T entity) {
  • getEntityManager().merge(entity);
  • }
  • public void remove(T entity) {
  • if (entity != null) {
  • getEntityManager().remove(entity);
  • }
  • }
  • public void remove(Object id) {
  • T entity = (T) getEntityManager().find(entityClass, id);
  • remove(entity);
  • }
  • public T find(Object id) {
  • return getEntityManager().find(entityClass, id);
  • }
  • public void refresh(T entity) {
  • getEntityManager().refresh(entity);
  • }
  • public TypedQuery namedQuery(String queryName) {
  • return getEntityManager().createNamedQuery(queryName, entityClass);
  • }
  • public TypedQuery query(String queryString) {
  • return getEntityManager().createQuery(queryString, entityClass);
  • }
  • public long count() {
  • CriteriaQuery criteriaQuery = getEntityManager().getCriteriaBuilder().createQuery();
  • Root root = criteriaQuery.from(entityClass);
  • criteriaQuery.select(getEntityManager().getCriteriaBuilder().count(root));
  • Query query = getEntityManager().createQuery(criteriaQuery);
  • return ((Long) query.getSingleResult()).longValue();
  • }
  • }
  • == Пример Session Bean (Stateless) - Gallery Facade ==
  • package org.test.facade;
  • import java.util.List;
  • import javax.ejb.*;
  • import org.test.eao.GalleryEAO;
  • import org.test.entity.Gallery;
  • import org.test.exception.GalleryAlreadyExistsException;
  • import org.test.exception.GalleryNotFoundException;
  • @Stateless
  • @LocalBean
  • public class GalleryFacade {
  • @Inject
  • private GalleryEAO galleryEAO;
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public Gallery findById(Long id) throws GalleryNotFoundException {
  • Gallery gallery = galleryEAO.find(id);
  • if (gallery == null) throw new GalleryNotFoundException("Gallery not found");
  • return gallery;
  • }
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public List findAll() {
  • return galleryEAO.findAll();
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void create(String name) throws GalleryAlreadyExistsException {
  • if (galleryEAO.findByName(name) != null) throw new GalleryAlreadyExistsException("Gallery already exists", name);
  • Gallery gallery = new Gallery(name);
  • galleryEAO.persist(gallery);
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void remove(Long id) throws GalleryNotFoundException {
  • Gallery gallery = findById(id);
  • galleryEAO.remove(gallery);
  • }
  • }
  • == Пример Application Exception - GalleryNotFoundException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryNotFoundException extends Exception {
  • public GalleryNotFoundException() {
  • }
  • public GalleryNotFoundException(String message) {
  • super(message);
  • }
  • }
  • == Пример Application Exception - GalleryAlreadyExistsException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryAlreadyExistsException extends Exception {
  • private String name;
  • public GalleryAlreadyExistsException() {
  • }
  • public GalleryAlreadyExistsException(String message, String name) {
  • super(message);
  • this.name = name;
  • }
  • public String getName() {
  • return name;
  • }
  • }
  • == Литература ==
  • * {{книга
  • автор = Панда Д.
  • заглавие = EJB 3 в действии
  • оригинал =
  • издательство = [[ДМК Пресс]]
  • год = 2014
  • страниц = 618
  • isbn = 978-5-97060-135-8
  • }}
  • == Ссылки ==
  • date=20110610141054 }}
  • * [http://java.sun.com/products/ejb/docs Спецификации различных версий Enterprise JavaBeans от SUN]
  • date=20071209143211 }}
  • date=20140108111510 }}, LinuxFormat 99
  • {{Java}}
  • [[Категория:Java Enterprise Edition]]
  • findAll() {
  • return namedQuery(Gallery.QUERY_FIND_ALL).getResultList();
  • }
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public Gallery findByName(String name) {
  • return namedQuery(Gallery.QUERY_FIND_BY_NAME)
  • .setParameter("name", name)
  • .getSingleResult();
  • }
  • }
  • == Пример Abstract EAO (Entity Access Object) ==
  • package org.test.eao;
  • import java.io.Serializable;
  • import javax.persistence.EntityManager;
  • import javax.persistence.Query;
  • import javax.persistence.TypedQuery;
  • import javax.persistence.criteria.CriteriaQuery;
  • import javax.persistence.criteria.Root;
  • public abstract class AbstractEAO {
  • protected abstract EntityManager getEntityManager();
  • private Class entityClass;
  • public Class getEntityClass() {
  • return entityClass;
  • }
  • public AbstractEAO(Class entityClass) {
  • this.entityClass = entityClass;
  • }
  • public void persist(T entity) {
  • getEntityManager().persist(entity);
  • }
  • public void merge(T entity) {
  • getEntityManager().merge(entity);
  • }
  • public void remove(T entity) {
  • if (entity != null) {
  • getEntityManager().remove(entity);
  • }
  • }
  • public void remove(Object id) {
  • T entity = (T) getEntityManager().find(entityClass, id);
  • remove(entity);
  • }
  • public T find(Object id) {
  • return getEntityManager().find(entityClass, id);
  • }
  • public void refresh(T entity) {
  • getEntityManager().refresh(entity);
  • }
  • public TypedQuery namedQuery(String queryName) {
  • return getEntityManager().createNamedQuery(queryName, entityClass);
  • }
  • public TypedQuery query(String queryString) {
  • return getEntityManager().createQuery(queryString, entityClass);
  • }
  • public long count() {
  • CriteriaQuery criteriaQuery = getEntityManager().getCriteriaBuilder().createQuery();
  • Root root = criteriaQuery.from(entityClass);
  • criteriaQuery.select(getEntityManager().getCriteriaBuilder().count(root));
  • Query query = getEntityManager().createQuery(criteriaQuery);
  • return ((Long) query.getSingleResult()).longValue();
  • }
  • }
  • == Пример Session Bean (Stateless) - Gallery Facade ==
  • package org.test.facade;
  • import java.util.List;
  • import javax.ejb.*;
  • import org.test.eao.GalleryEAO;
  • import org.test.entity.Gallery;
  • import org.test.exception.GalleryAlreadyExistsException;
  • import org.test.exception.GalleryNotFoundException;
  • @Stateless
  • @LocalBean
  • public class GalleryFacade {
  • @Inject
  • private GalleryEAO galleryEAO;
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public Gallery findById(Long id) throws GalleryNotFoundException {
  • Gallery gallery = galleryEAO.find(id);
  • if (gallery == null) throw new GalleryNotFoundException("Gallery not found");
  • return gallery;
  • }
  • @TransactionAttribute(TransactionAttributeType.SUPPORTS)
  • public List findAll() {
  • return galleryEAO.findAll();
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void create(String name) throws GalleryAlreadyExistsException {
  • if (galleryEAO.findByName(name) != null) throw new GalleryAlreadyExistsException("Gallery already exists", name);
  • Gallery gallery = new Gallery(name);
  • galleryEAO.persist(gallery);
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void remove(Long id) throws GalleryNotFoundException {
  • Gallery gallery = findById(id);
  • galleryEAO.remove(gallery);
  • }
  • }
  • == Пример Application Exception - GalleryNotFoundException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryNotFoundException extends Exception {
  • public GalleryNotFoundException() {
  • }
  • public GalleryNotFoundException(String message) {
  • super(message);
  • }
  • }
  • == Пример Application Exception - GalleryAlreadyExistsException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryAlreadyExistsException extends Exception {
  • private String name;
  • public GalleryAlreadyExistsException() {
  • }
  • public GalleryAlreadyExistsException(String message, String name) {
  • super(message);
  • this.name = name;
  • }
  • public String getName() {
  • return name;
  • }
  • }
  • == Литература ==
  • * {{книга
  • автор = Панда Д.
  • заглавие = EJB 3 в действии
  • оригинал =
  • издательство = [[ДМК Пресс]]
  • год = 2014
  • страниц = 618
  • isbn = 978-5-97060-135-8
  • }}
  • == Ссылки ==
  • date=20110610141054 }}
  • * [http://java.sun.com/products/ejb/docs Спецификации различных версий Enterprise JavaBeans от SUN]
  • date=20071209143211 }}
  • date=20140108111510 }}, LinuxFormat 99
  • {{Java}}
  • [[Категория:Java Enterprise Edition]]
  • findAll() {
  • return galleryEAO.findAll();
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void create(String name) throws GalleryAlreadyExistsException {
  • if (galleryEAO.findByName(name) != null) throw new GalleryAlreadyExistsException("Gallery already exists", name);
  • Gallery gallery = new Gallery(name);
  • galleryEAO.persist(gallery);
  • }
  • @TransactionAttribute(TransactionAttributeType.REQUIRED)
  • public void remove(Long id) throws GalleryNotFoundException {
  • Gallery gallery = findById(id);
  • galleryEAO.remove(gallery);
  • }
  • }
  • == Пример Application Exception - GalleryNotFoundException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryNotFoundException extends Exception {
  • public GalleryNotFoundException() {
  • }
  • public GalleryNotFoundException(String message) {
  • super(message);
  • }
  • }
  • == Пример Application Exception - GalleryAlreadyExistsException ==
  • package org.test.exception;
  • import javax.ejb.ApplicationException;
  • @ApplicationException(rollback=true)
  • public class GalleryAlreadyExistsException extends Exception {
  • private String name;
  • public GalleryAlreadyExistsException() {
  • }
  • public GalleryAlreadyExistsException(String message, String name) {
  • super(message);
  • this.name = name;
  • }
  • public String getName() {
  • return name;
  • }
  • }
  • == Литература ==
  • * {{книга
  • автор = Панда Д.
  • заглавие = EJB 3 в действии
  • оригинал =
  • издательство = [[ДМК Пресс]]
  • год = 2014
  • страниц = 618
  • isbn = 978-5-97060-135-8
  • }}
  • == Ссылки ==
  • date=20110610141054 }}
  • * [http://java.sun.com/products/ejb/docs Спецификации различных версий Enterprise JavaBeans от SUN]
  • date=20071209143211 }}
  • date=20140108111510 }}, LinuxFormat 99
  • {{Java}}
  • [[Категория:Java Enterprise Edition]]
Enterprise JavaBeans (также часто употребляется в виде аббревиатуры EJB) — спецификация технологии написания и поддержки серверных компонентов, содержащих бизнес-логику. Является частью Java EE.
https://ru.wikipedia.org/wiki/Enterprise_JavaBeans
Che cos'è JavaBeans - definizione
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