假设延迟载入出现session close的情况下
方法1.在web.xml中配置spring的openSessionInViewFilter
<filter> <filter-name>hibernateFilter</filter-name> <filter-class> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter </filter-class></filter<filter-mapping> <filter-name>hibernateFilter</filter-name> <url-pattern>*.do</url-pattern></filter-mapping>
tx = session.beginTransaction();Customer customer=(Customer)session.load(Customer.class,new Long(1));if(!Hibernate.isInitialized(customer))Hibernate.initialize(customer);tx.commit();session.close();customer.getName();
在业务逻辑层中使用延迟载入
即使在视图外面，Spring框架也通过使用AOP 拦截器 HibernateInterceptor来使得延迟载入变得非常easy实现。这个Hibernate 拦截器透明地将调用配置在Spring应用程序上下文中的业务对象中方法的请求拦截下来。在调用方法之前打开一个Hibernate会话。然后在方法运行完之后将会话关闭。
让我们来看一个简单的样例。如果我们有一个接口
BussinessObject：
public interface BusinessObject { 
public void doSomethingThatInvolvesDaos();
} 类BusinessObjectImpl实现了BusinessObject接口:
public class BusinessObjectImpl implements BusinessObject { 
public void doSomethingThatInvolvesDaos() { // lots of logic that calls// DAO classes Which access// data objects lazily 
} } 通过在Spring应用程序上下文中的一些配置。我们能够让将调用BusinessObject的方法拦截下来，再令它的方法支持延迟载入。看看以下的一个程序片段：
< beans > < bean id ="hibernateInterceptor" class ="org.springframework.orm.hibernate.HibernateInterceptor" > < property name ="sessionFactory" > < ref bean ="sessionFactory" /> </ property > </ bean > < bean id ="businessObjectTarget" class ="com.acompany.BusinessObjectImpl" > < property name ="someDAO" >< ref bean ="someDAO" /></ property > </ bean > < bean id ="businessObject" class ="org.springframework.aop.framework.ProxyFactoryBean" > < property name ="target" >< ref bean ="businessObjectTarget" /></ property > < property name ="proxyInterfaces" > < value > com.acompany.BusinessObject </ value > </ property > < property name ="interceptorNames" > < list > < value > hibernateInterceptor </ value > </ list > </ property > </ bean > </ beans > 当businessObject被调用的时候，HibernateInterceptor打开一个Hibernate会话，并将调用请求传递给 BusinessObjectImpl对象。当BusinessObjectImpl运行完毕后，HibernateInterceptor透明地关闭了会话。应用层的代码不用了解不论什么持久层逻辑，还是实现了延迟载入。