spring ioc---DI进阶之引入其他bean

版权声明：仅供学习交流使用 https://blog.csdn.net/drxRose/article/details/84933601

官方xsd文档中关于ref的参考说明

原文链接:http://www.springframework.org/schema/beans/spring-beans.xsd

1.标签ref:

Defines a reference to another bean in this factory or an external factory (parent or included factory).

2.bean标签内的属性ref:

A short-cut alternative to a nested "<ref bean='...'/>" element.

3.也可使用内部bean的方式,引入其他的bean.

---

使用的类对象

package siye;
public class Person
{
}

package siye;
public class User
{
	Person person;
	public void setPerson(Person person)
	{
		this.person = person;
	}
}

xml配置文件,文件名`config.xml`

<bean id="thePerson" class="siye.Person" />    
<!--使用ref标签或属性 -->                             
<bean id="obj0" class="siye.User">             
	<property name="person">                   
		<ref bean="thePerson" />               
	</property>                                
</bean>                                        
<bean id="obj1" class="siye.User">             
	<property name="person" ref="thePerson" /> 
</bean>                                        
<!--使用inner-bean -->                           
<bean id="obj2" class="siye.User">             
	<property name="person">                   
		<bean class="siye.Person" />           
	</property>                                
</bean>                                        

测试类

package siye;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UnitTest
{
	public static void main(String[] args)
	{
		String path = "classpath:/siye/config.xml";
		ClassPathXmlApplicationContext context =
				new ClassPathXmlApplicationContext(path);
		System.out.println(context.getBean("obj0", User.class));
		System.out.println(context.getBean("obj1", User.class));
		System.out.println(context.getBean("obj2", User.class));
		context.close();
	}
}

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