依赖注入简单案例

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USB接

public interface USB {   public void write();   public void read();}

Udisk类

public class Udisk implements USB {    public void write() {            System.out.println("U 盘写");    }    public void read() {            System.out.println("U盘读");    }}

Movedisk类

public class Movedisk implements USB {    public void write() {            System.out.println("移动硬盘写");    }    public void read() {        System.out.println("移动硬盘读");    }}

Computer类

public class Computer{    private USB usb;    public USB getUsb() {        return usb;    }    public void setUsb(USB usb) {        this.usb = usb;    }    public void test(){        usb.write();        usb.read();    }}

Test类

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

beans.xml

<beans> <bean id="udisk" class="plok.Udisk"/>  <bean id="movedisk" class="plok.Movedisk"/>  <bean id="computer" class="plok.Computer">     <property name="usb" ref="udisk" />  </bean>  </beans>

运行结果：

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