Spring--->IOC(DI)使用方式

依赖注入(控制反转)方式:设值,  构造 ex(setter,constructor);

public class HelloBean{

private String beanName;

public HelloBean(String beanName){

System.out.println("通过构造函数进行注入");

this.beanName=beanName;

}

public void setBeanName(String beanName){

System.out.println("通过设值进行注入");

this.beanName=beanName;

}

public void printBeanName(){

System.out.println("beanName is:"+beanName);

}

Attention(注意)-->设值注入时参数(beanName)要和applicationContext.xml中property name="beanName"一致,不然注入会报错!!!

applicationContext.xml-->

<bean id="helloBean" class="com.xx.HelloBean">

<property name="xx" value="xx"/>

SetterIoc--><property name="wwService" ref=''wwService"/>

</bean>

TestDemo---.

@test

public void testDI(){

ApplicationContext appContext=new ClassPathXmlApplicationContext("applicationContext.xml");

HelloBean helloBean=(HelloBean)appContext.getBean("helloBean");

helloBean.printBeanName();

}

Result--->print:beanName is:xx;

三种注入方式-->属性设值注入(Setter)常用;

spring核心思想是容器负责管理所需对象的创建(IOC)