• Hibernate integration：Spring與Hibernate這樣的ORM框架整合的非常好，Spring提供了對(duì)Hibernate session的高效和安全的處理，它可通過(guò)application context配置Hibernate的SessionFactories和JDBC數(shù)據(jù)源，并使得應(yīng)用易于測(cè)試。

• JSP page：createProduct.jsp是用來(lái)創(chuàng)建新產(chǎn)品的頁(yè)面，它包含UI組件并將組件打包成ProductBean，ValidateItemsRange標(biāo)簽用來(lái)驗(yàn)證用戶選擇的種類數(shù)量，對(duì)每一個(gè)產(chǎn)品至少要有一個(gè)種類被選中。

• 頁(yè)面導(dǎo)航：應(yīng)用中的導(dǎo)航被定義在應(yīng)用的配置文件faces-navigation.xml中，CreateProduct的導(dǎo)航準(zhǔn)則如下：

?? *
??
????? createProduct
????? /createProduct.jsp
??

?? /createProduct.jsp
??
????? success
????? /uploadImage.jsp
??
??
????? retry
????? /createProduct.jsp
??
??
????? cancel
????? /productList.jsp
??

• Backing bean：ProductBean不僅包含有將數(shù)據(jù)映射到頁(yè)面上的UI組件的屬性，還包括三個(gè)action：createAction、editAction和deleteAction，下面是createAction方法的代碼：

public String createAction() {
?? try {
????? Product product = ProductBeanBuilder.createProduct(this);

????? //Save the product.
????? this.serviceLocator.getCatalogService().saveProduct(product);

????? //Store the current product id inside the session bean.
????? //For the use of image uploader.
????? FacesUtils.getSessionBean().setCurrentProductId(this.id);

????? //Remove the productList inside the cache.
????? this.logger.debug("remove ProductListBean from cache");
????? FacesUtils.resetManagedBean(BeanNames.PRODUCT_LIST_BEAN);
?? } catch (DuplicateProductIdException de) {
????? String msg = "Product id already exists";
????? this.logger.info(msg);
????? FacesUtils.addErrorMessage(msg);

????? return NavigationResults.RETRY;
?? } catch (Exception e) {
????? String msg = "Could not save product";
????? this.logger.error(msg, e);
????? FacesUtils.addErrorMessage(msg + ": Internal Error");

????? return NavigationResults.FAILURE;
?? }
?? String msg = "Product with id of " + this.id + " was created successfully.";
?? this.logger.debug(msg);
?? FacesUtils.addInfoMessage(msg);

?? return NavigationResults.SUCCESS;
}

• Managed-bean聲明：ProductBean必須在JSF配置文件faces-managed-bean.xml中配置：

??
????? Backing bean that contains product information.
??
?? productBean
?? catalog.view.bean.ProductBean
?? request???
??
????? id
????? #{param.productId}
??
??
????? serviceLocator
????? #{serviceLocatorBean}
??

• ?表示層和業(yè)務(wù)邏輯層之間的整合： ServiceLocator抽象了查找服務(wù)的邏輯，在范例應(yīng)用中，ServiceLocator被定義為一個(gè)接口，該接口實(shí)現(xiàn)為一個(gè)JSF的 managed bean，即ServiceLocatorBean，它將在Spring的application context中尋找服務(wù)：

ServletContext context = FacesUtils.getServletContext();
this.appContext = WebApplicationContextUtils.getRequiredWebApplicationContext(context);
this.catalogService = (CatalogService)this.lookupService(CATALOG_SERVICE_BEAN_NAME);
this.userService = (UserService)this.lookupService(USER_SERVICE_BEAN_NAME);

• 業(yè)務(wù)對(duì)象：由于采用Hibernate提供持久化，因此Product和Category兩個(gè)業(yè)務(wù)對(duì)象需要為它們的所有field提供getter和setter。

• 業(yè)務(wù)服務(wù)：CatalogService接口中定義了所有的與Catalog management相關(guān)的服務(wù)：

public interface CatalogService {
?? public Product saveProduct(Product product) throws CatalogException;
?? public void updateProduct(Product product) throws CatalogException;
?? public void deleteProduct(Product product) throws CatalogException;
?? public Product getProduct(String productId) throws CatalogException;
?? public Category getCategory(String categoryId) throws CatalogException;
?? public List getAllProducts() throws CatalogException;
?? public List getAllCategories() throws CatalogException;
}

• Spring Configuration：這里是CatalogService的Spring配置：

??




??




??
??
??
?????
???????? PROPAGATION_REQUIRED,readOnly
?????? PROPAGATION_REQUIRED
?????? PROPAGATION_REQUIRED
?????? PROPAGATION_REQUIRED
?????
??

• Spring和Hibernate的整合：下面是HibernateSessionFactory的配置：

<!-- Hibernate SessionFactory Definition -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
?? <property name="mappingResources">
??????<list>
???????? <value>catalog/model/businessobject/Product.hbm.xml</value>
???????? <value>catalog/model/businessobject/Category.hbm.xml</value>
???????? <value>catalog/model/businessobject/User.hbm.xml</value>
??????</list>
?? </property>
?? <property name="hibernateProperties">
??????<props>
???????? <prop key="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</prop>
?????? <prop key="hibernate.show_sql">true</prop>
?????? <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
?????? <prop key="hibernate.cache.provider_class">net.sf.hibernate.cache.HashtableCacheProvider</prop>
??????</props>
?? </property>
?? <property name="dataSource">
??????<ref bean="dataSource"/>
?? </property>
</bean>

CatalogDao uses HibernateTemplate to integrate between Hibernate and Spring. Here's the configuration for HibernateTemplate:

<!-- Hibernate Template Defintion -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate.HibernateTemplate">
?? <property name="sessionFactory"><ref bean="sessionFactory"/></property>
?? <property name="jdbcExceptionTranslator"><ref bean="jdbcExceptionTranslator"/></property>
</bean>


<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
??????"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
??????"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping package="catalog.model.businessobject">
?? <class name="Product" table="product">
??????<id name="id" column="ID" unsaved-value="null">
???????? <generator class="assigned"/>
??????</id>
??????<property name="name" column="NAME" unique="true" not-null="true"/>
??????<property name="price" column="PRICE"/>????
??????<property name="width" column="WIDTH"/>??????
??????<property name="height" column="height"/>??????
??????<property name="description" column="description"/> ??
??????<set name="categoryIds" table="product_category" cascade="all">
???????? <key column="PRODUCT_ID"/>
???????? <element column="CATEGORY_ID" type="string"/>
??????</set>
?? </class>
</hibernate-mapping>

CatalogDao is wired with HibernateTemplate by Spring:

<!-- Catalog DAO Definition: Hibernate implementation -->
<bean id="catalogDao" class="catalog.model.dao.hibernate.CatalogDaoHibernateImpl">
?? <property name="hibernateTemplate"><ref bean="hibernateTemplate"/></property>
</bean>