Spring------自动化装配Bean（二）

 1 package soundsystem;
 2 import org.springframework.context.annotation.Bean;
 3 import org.springframework.context.annotation.ComponentScan;
 4 import org.springframework.context.annotation.Configuration;
 5 
 6 @Configuration
 7 public class JavaConfig2 {
 8     @Bean
 9     public CompactDisc sgtPeppers(){
10         
11         System.out.println("自行扩展业务逻辑1");
12         return new SgtPeppers();        
13     }    
14     @Bean
15     public CDPlayer cdplayer(){
16         //Cdplayer依赖于CompactDisc，在这里一起装配
17         System.out.println("自行扩展业务逻辑2");
18         return new CDPlayer(sgtPeppers());    
19     }
20 }

package test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import soundsystem.CDPlayer;
import soundsystem.CompactDisc;
import soundsystem.MediaPlayer;
import soundsystem.SgtPeppers;

public class Test {
    public static void main(String[] args) {
    //基于java类中配置上下文
    AnnotationConfigApplicationContext context = 
            new AnnotationConfigApplicationContext(soundsystem.JavaConfig2.class); 
    //基于xml配置上下文
    //ClassPathXmlApplicationContext context =
            new ClassPathXmlApplicationContext("applicationContext.xml");
    CompactDisc cd= (CompactDisc) context.getBean("sgtPeppers");
    cd.play();
//    MediaPlayer player=context.getBean(CDPlayer.class);
//    player.play();
    
    }
}