spring中的FactoryBean代码示例

<bean id="sessionFactory" 
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
    <property name="dataSource" ref="dataSource" /> 
    <property name="hibernateProperties"> 
      <props> 
        <!-- 是否自动更新表项目 --> 
        <prop key="hibernate.hbm2ddl.auto">update</prop> 
        <!-- 数据库使用的方言 --> 
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop> 
        <!-- 是否显示产生的sql语句 --> 
        <prop key="hibernate.show_sql">true</prop> 
        <!-- 是否显示格式化产生的sql语句 --> 
        <prop key="hibernate.format_sql">true</prop> 
      </props> 
    </property> 
    <property name="mappingResources"> 
      <list> 
        <value>bean/User.hbm.xml</value> 
      </list> 
    </property> 
  </bean> 

ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml"); 
System.out.println(applicationContext.getBean("sessionFactory").getClass().getName()); 

package factory; 
import org.springframework.beans.factory.FactoryBean; 
import bean.User; 
 
public class UserFactory implements FactoryBean<User>{ 
  @Override 
  public User getObject() throws Exception { 
    return new User(); 
  } 
  @Override 
  public Class<?> getObjectType() { 
    return User.class; 
  } 
  /** 
   * 工厂所管理的对象是否为单例的 
   * 即如果该方法返回true，那么通过getObject()方法返回的对象都是同一个对象 
   */ 
  @Override 
  public boolean isSingleton() { 
    return true; 
  } 
} 

<bean id="userFactory" class="factory.UserFactory" /> 

UserFactory userFactory = (UserFactory) applicationContext.getBean("&userFactory");