Spring IOC之构造注入

构造注入可以按：（1）按照索引下标匹配参数 （2）参数类型注入

1.项目创建

https://blog.csdn.net/zhaolinxuan1/article/details/84897949

https://blog.csdn.net/zhaolinxuan1/article/details/84932897

2.DepartMent类

注意：需要有构造方法

public class DepartMent {
	private Integer deId;

	private String deName;

	public Integer getDeId() {
		return deId;
	}
	public DepartMent(){}
	
	public DepartMent(Integer deId, String deName) {
		super();
		this.deId = deId;
		this.deName = deName;
	}
	public void setDeId(Integer deId) {
		this.deId = deId;
	}

	public String getDeName() {
		return deName;
	}

	public void setDeName(String deName) {
		this.deName = deName;
	}

	@Override
	public String toString() {
		return "DepartMent [deId=" + deId + ", deName=" + deName + "]";
	}

}

3.beans.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" xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- 构造方法 1：索引注入  DepartMent-->
	<bean id="departMent" class="com.DepartMent">
		<constructor-arg index="0" value="101"></constructor-arg>
		<constructor-arg index="1" value="技术部"></constructor-arg>
	</bean>

	<!-- 构造方法 2：参数类型注入 DepartMent-->
	<bean id="departMentType" class="com.DepartMent">
		<constructor-arg value="102" type="java.lang.Integer"></constructor-arg>
		<constructor-arg value="研发部" type="java.lang.String"></constructor-arg>
	</bean>
</beans>

4.测试

public class Test {

	public static void main(String[] args) {
		//Sprig 依赖注入方式 ：构造方法（按索引下标匹配参数） 
		ConfigurableApplicationContext bf = new ClassPathXmlApplicationContext("beans.xml");
		DepartMent departMent = (DepartMent) bf.getBean("departMent");
		System.out.println(departMent);
		//Sprig 依赖注入方式 ：构造方法（按参数类型匹配） 
		BeanFactory beanFactory=new ClassPathXmlApplicationContext("beans.xml");
		DepartMent departMentType=(DepartMent) beanFactory.getBean("departMentType");
		System.out.println(departMentType);
		
	}

}