Hello Spring（2）Computer with Usb interface

目录结构 files structure

新建一接口

new Interface

Usb.java

1 package test;
2 
3 public interface Usb {
4     
5     public void read();
6     public void write();
7 
8 }

Udisk.java

 1 package test;
 2 
 3 public class Udisk implements Usb {
 4 
 5     @Override
 6     public void read() {
 7         // TODO Auto-generated method stub
 8         System.out.println("Udisk read();");
 9         
10     }
11 
12     @Override
13     public void write() {
14         // TODO Auto-generated method stub
15         System.out.println("Udisk write();");
16         
17     }
18 
19 }

MoveDisk.java

 1 package test;
 2 
 3 public class Movedisk implements Usb {
 4 
 5     @Override
 6     public void read() {
 7         // TODO Auto-generated method stub
 8         System.out.println("Movedisk read();");
 9         
10     }
11 
12     @Override
13     public void write() {
14         // TODO Auto-generated method stub
15         System.out.println("Movedisk write();");
16         
17     }
18 
19 }

Computer.java

 1 package test;
 2 
 3 public class Computer {
 4     
 5     
 6     private Usb usb;
 7 
 8     public Usb getUsb() {
 9         return usb;
10     }
11 
12     public void setUsb(Usb usb) {
13         this.usb = usb;
14     }
15     
16     public void test(){
17         
18         usb.read();
19         usb.write();
20         
21     }
22 
23 }

beans.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE beans PUBLIC "" "http://www.springframework.org/dtd/spring-beans.dtd" >
 3 <beans>
 4 
 5     <bean id="helloSpring" class="test.HelloSpring">
 6         <property name="name" value="杨力权"></property>
 7     </bean>
 8     
 9     <bean id="uDisk" class="test.Udisk"></bean>
10     <bean id="moveDisk" class="test.Movedisk"></bean>
11     
12     <bean id="computer" class="test.Computer">
13         <property name="usb" ref="uDisk"></property>
14     </bean>
15 
16 </beans>

Tester.java

 1 package test;
 2 
 3 import org.springframework.beans.factory.BeanFactory;
 4 import org.springframework.beans.factory.xml.XmlBeanFactory;
 5 import org.springframework.core.io.ClassPathResource;
 6 import org.springframework.core.io.Resource;
 7 
 8 @SuppressWarnings("deprecation")
 9 public class Tester {
10     
11     public static void main( String[] args){
12         
13         Resource r = new ClassPathResource("beans.xml");
14         BeanFactory factory = new XmlBeanFactory(r);
15         
16         Computer computer = (Computer) factory.getBean("computer");
17         computer.test();
18         
19     }
20 
21 }

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”。