Hello Spring（2）Computer with Usb interface

目录结构 files structure

新建一接口

new Interface

Usb.java

package test;

public interface Usb {
    
    public void read();
    public void write();

}

Udisk.java

package test;

public class Udisk implements Usb {

    @Override
    public void read() {
        // TODO Auto-generated method stub
        System.out.println("Udisk read();");
        
    }

    @Override
    public void write() {
        // TODO Auto-generated method stub
        System.out.println("Udisk write();");
        
    }

}

MoveDisk.java

package test;

public class Movedisk implements Usb {

    @Override
    public void read() {
        // TODO Auto-generated method stub
        System.out.println("Movedisk read();");
        
    }

    @Override
    public void write() {
        // TODO Auto-generated method stub
        System.out.println("Movedisk write();");
        
    }

}

Computer.java

package test;

public class Computer {
    
    
    private Usb usb;

    public Usb getUsb() {
        return usb;
    }

    public void setUsb(Usb usb) {
        this.usb = usb;
    }
    
    public void test(){
        
        usb.read();
        usb.write();
        
    }

}

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "" "http://www.springframework.org/dtd/spring-beans.dtd" >
<beans>

    <bean id="helloSpring" class="test.HelloSpring">
        <property name="name" value="杨力权"></property>
    </bean>
    
    <bean id="uDisk" class="test.Udisk"></bean>
    <bean id="moveDisk" class="test.Movedisk"></bean>
    
    <bean id="computer" class="test.Computer">
        <property name="usb" ref="uDisk"></property>
    </bean>

</beans>

Tester.java

package test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

@SuppressWarnings("deprecation")
public class Tester {
    
    public static void main( String[] args){
        
        Resource r = new ClassPathResource("beans.xml");
        BeanFactory factory = new XmlBeanFactory(r);
        
        Computer computer = (Computer) factory.getBean("computer");
        computer.test();
        
    }

}

result

把程序的流转控制，以配置文件的方式来设置接口，这就是我目前理解的 “控制反转”。