Spring3之 实例化bean2

Spring3之 bean命名(http://ponlya.iteye.com/blog/1004889) 中已经有一种实例化bean的方法了，这里看spring3文档有另二种：Instantiation with a static factory method（静态工厂方法实例化），Instantiation using an instance factory method（实例工厂方法实例化）

 

a)、Instantiation with a static factory method

com.spring305.test.beanInit.po.StaticFactoryBeanInit.java

public class StaticFactoryBeanInit {

	public void test(){
		System.out.println(StaticFactoryBeanInit.class+" test method");
	}
}

 

 

com.spring305.test.beanInit.po.StaticFactory.java

public class StaticFactory {

	private static StaticFactoryBeanInit staticFactoryBeanInit = new StaticFactoryBeanInit();
	/**
	 * 测试静态工厂方法实例化bean
	 * @return
	 */
	public static StaticFactoryBeanInit createBean(){
		return staticFactoryBeanInit;
	}
	
}

单例模式实现

 

b)、Instantiation using an instance factory method

com.spring305.test.beanInit.po.StaticFactory2.java

public class StaticFactory2 {

	private static StaticFactoryBeanInit staticFactoryBeanInit = new StaticFactoryBeanInit();
	/**
	 * 测试非静态实例工厂方法实例化bean
	 * @return
	 */
	public  StaticFactoryBeanInit createBean(){
		return staticFactoryBeanInit;
	}
	
}

 一字母之差而已。

src/testBeanInit.xml

 <!-- 静态工厂方法实例化Bean
 <bean id="staticFactoryBeanInit" class="com.spring305.test.beanInit.po.StaticFactory"
  factory-method="createBean">
 </bean>
  -->
  
   
 <!-- 实例工厂方法实例化Bean. class 属性必须为空 -->
 <bean id="staticFactory" class="com.spring305.test.beanInit.po.StaticFactory2"></bean>
 <bean id="staticFactoryBeanInit" factory-bean="staticFactory"
  factory-method="createBean">
 </bean>  

 

 

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