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