如果想要使用spring來實現依賴注入，需要幾個重要的步驟：
　　1 定義主要的類和需要分離的屬性。
　　2 配置bean.xml。通過配置檔案，確定主要的類和屬性之間的關係，以及實現類。
　　3 通過應用上下文，獲取bean，並進行使用。

專案結構如下所示

注入物件/注入屬性

//Juggler.java
package com.spring.test.action1;
public class Juggler implements Performer{
    private int beanBags = 3;

    public Juggler(){

    }

    public
 
 Juggler(int beanBags){
        this.beanBags = beanBags;
    }

    public void perform()  {
        System.out.println("Juggler "+ beanBags +" beanBags");
    }

}

//Performer.java
package com.spring.test.action1;

public interface Performer {
    void perform() ;
}

//Poem.java
package com.spring.test.action1;

public
 
 interface Poem {
    void recite();
}

//PoeticJuggler.java
package com.spring.test.action1;

public class PoeticJuggler extends Juggler {
     private Poem poem;

        public PoeticJuggler(Poem poem){
            super();
            this.poem = poem;
        }

        public PoeticJuggler(int beanBags,Poem poem){
            super
 
(beanBags);
            this.poem = poem;
        }

        public void perform() {
            super.perform();
            System.out.println("While reciting...");
            poem.recite();
        }

}

// Sonnet29.java
package com.spring.test.action1;

public class Sonnet29 implements Poem{
    private static String lines = "嘛咪嘛咪哄";

    public Sonnet29() {

    }

    public void recite() {
        System.out.println(lines);
    }

}

//test.java

package com.spring.test.action1;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
      //  Performer performer = (Performer)ctx.getBean("duke");
      //  performer.perform();//Juggler 15 beanBags
        Performer performer1 = (Performer)ctx.getBean("poeticDuke");
        performer1.perform();
    }
}

//bean.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
     <bean id="duke" class="com.spring.test.action1.Juggler">
         <constructor-arg value="15"/>
     </bean>
     <bean id="sonnet29" class="com.spring.test.action1.Sonnet29"/>
     <bean id="poeticDuke" class="com.spring.test.action1.PoeticJuggler">
         <constructor-arg value="15"/>
         <constructor-arg ref="sonnet29"/>
     </bean>
</beans>

//輸出結果
Juggler 15 beanBags
While reciting...
嘛咪嘛咪哄