Spring中FactoryBean的使用方法

可以理解为工厂非静态方法的特例：

import org.joda.time.DateTime;
import org.springframework.beans.factory.FactoryBean;

public class NextDayDateFactoryBean implements FactoryBean
{

    @Override
    public Object getObject() throws Exception
    {
        // TODO Auto-generated method stub
        return new DateTime().plus(1);
    }

    @Override
    public Class getObjectType()
    {
        // TODO Auto-generated method stub
        return DateTime.class;
    }

    @Override
    public boolean isSingleton()
    {
        // TODO Auto-generated method stub
        return false;
    }

}

<bean id="nextDayDate" class="com.uqee.spring.beans.NextDayDateFactoryBean"></bean>

此时调用getBean("nextDayDate")返回的是NextDayDateFactoryBean实例返回的DateTime对象，而不是

NextDayDateFactoryBean对象, 要得到该FactoryBean可通过如下方法访问：

Object o2 = factory.getBean("&nextDayDate");