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具体步骤
(1)普通的接口
(2)实现接口的类,该类为需要装配到spring bean中
(3)配置类,由该类定义bean
示例代码:
接口1:(普通的接口)
package com.spring.action.javaconfig;
/**
* 一个光盘接口
*/
public interface CompactDisc {
void sing();//光盘的sing功能
}
接口1实现:(普通的类)
package com.spring.action.javaconfig;
/**
* CompactDisc实现类
*/
public class SgtPeppers implements CompactDisc {
public void sing() {
System.out.println("sgtPeppers的sing方法");
}
}
接口2:(普通的接口)
package com.spring.action.javaconfig;
/**
* 媒体播放器
*/
public interface MediaPlayer {
void play(); //一个播放方法
}
接口2实现:(在构造方法使用了@Autowired来自动注入CompactDisc参数)
package com.spring.action.javaconfig;
import org.springframework.beans.factory.annotation.Autowired;
public class CDPlayer implements MediaPlayer {
private CompactDisc compactDisc;
@Autowired
public CDPlayer(CompactDisc compactDisc){
this.compactDisc = compactDisc;
}
public void play() {
System.out.println("播放器开始播放");
compactDisc.sing();
}
}
配置类
@Configuration注解表明其为配置类
通过@Bean,将方法返回的实例作为Spring bean保存
在第二个方法中,@Bean 注解的方法会自动将bean注入到参数中。
package com.spring.action.javaconfig;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
public class JavaConfig {
//为sgtPeppers创建bean
@Bean
public CompactDisc compactDisc(){
return new SgtPeppers();
}
//为DCPlayer创建bean
@Bean
public MediaPlayer mediaPlayer(CompactDisc compactDisc){
return new CDPlayer(compactDisc);
}
}
测试类:
package com.spring.action;
import com.spring.action.javaconfig.CompactDisc;
import com.spring.action.javaconfig.JavaConfig;
import com.spring.action.javaconfig.MediaPlayer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
//使用SpringJUnit4ClassRunner,可以在测试开始的时候自动创建Spring的应用上下文
@RunWith(SpringJUnit4ClassRunner.class)
//导入配置
@ContextConfiguration(classes = JavaConfig.class)
public class JavaconfigTest {
@Autowired
private CompactDisc compactDisc;
@Autowired
private MediaPlayer mediaPlayer;
@Test
public void play() {
mediaPlayer.play();
}
}
测试结果
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
播放器开始播放
sgtPeppers的sing方法