spring入门（6）set方法注入依赖之null的注入

Member.java

package www.csdn.spring.constructor.bean;

public class Member {

}

MemberBean.java

package www.csdn.spring.constructor.bean;

public class MemberBean {

	public String name;

	public Member member;

	public void setMember(Member member) {
		this.member = member;
	}

	public void setName(String name) {
		this.name = name;
	}

}

spring-null.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="memberBean" class="www.csdn.spring.constructor.bean.MemberBean">
		<!-- value="null" null是字符串 -->
		<property name="name">
			<null />
		</property>
		<property name="member">
			<null />
		</property>
	</bean>

</beans>

MemberTest.java

package www.csdn.spring.constructor.bean;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MemberTest {

	
	@Test
	public void testBean(){
		ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-null.xml");
		
		MemberBean bean = context.getBean("memberBean", MemberBean.class);
		
		System.out.println(bean.name);
		System.out.println(bean.member);
	}
}

控制台输出：

null

null

它们代表空值