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  • 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

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  • 原文地址:https://www.cnblogs.com/javawebsoa/p/3042333.html
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