a02-4 装配bean-混合配置（spring实战）

• 在自动装配时，spring不在意装配的bean来自哪里。

一、在JavaConfig中引用xml配置

1.1、注入java实体

1、定义接口

public interface CompactDisc {
    void play();
}

2、定义实现类

public class SgtPepper implements CompactDisc {
    public void play() {
        System.out.println("sgt-pepper play ... ...");
    }
}

3、定义配置文件

@Configuration
public class CDConfig {
    @Bean
    public CompactDisc compactDisc() {
        return new SgtPepper();
    }
}

1.2、添加实体类并引用配置文件

1、定义java类

public class CDPlayer {
    private CompactDisc compactDisc;
    public CDPlayer(CompactDisc compactDisc) {
        this.compactDisc = compactDisc;
    }
    public void play() {
        compactDisc.play();
    }
}

2、创建配置文件

@Configuration
@Import(CDConfig.class)
public class CDPlayerConfig {
    @Bean
    public CDPlayer cdPlayer(CompactDisc compactDisc) {
        return new CDPlayer(compactDisc);
    }
}

• 说明：
• @Import(CDConfig.class)：注入配置类CDConfig

3、创建测试类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = CDPlayerConfig.class)
public class CDPlayerTest {
    @Autowired
    private CDPlayerConfig cdPlayerConfig;
    @Autowired
    private CDConfig cdConfig;
    @Test
    public void getBean() {
        CompactDisc compactDisc = cdConfig.compactDisc();
        CDPlayer cdPlayer = cdPlayerConfig.cdPlayer(compactDisc);
        cdPlayer.play();
    }
}

• 说明：
• @ContextConfiguration(classes = CDPlayerConfig.class)：指定spring的配置文件
• 在CDPlayerConfig配置文件中注入了CDConfig，所以可以直接注入CDConfig和CDPlayerConfig

1.3、引用多个配置文件

1、创建配置文件

@Configuration
@Import({CDConfig.class, CDPlayerConfig.class})
public class SystemConfig {
}

2、创建配置类

@Configuration
@Import({CDConfig.class, CDPlayerConfig.class})
public class SystemConfig {
}

• 说明：
• @Import({CDConfig.class, CDPlayerConfig.class})：同时注入两个配置类

3、测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SystemConfig.class)
public class SystemConfigTest {
    @Autowired
    private CDPlayerConfig cdPlayerConfig;
    @Autowired
    private CDConfig cdConfig;
    @Test
    public void getBean() {
        CompactDisc compactDisc = cdConfig.compactDisc();
        CDPlayer cdPlayer = cdPlayerConfig.cdPlayer(compactDisc);
        cdPlayer.play();
    }
}

1.4、在config中引用xml配置文件

1、创建实体类

public class MediaPlayer implements CompactDisc {
    private String title;
    private String desc;
    private List<String> list;
    public MediaPlayer(String title, String desc, List<String> list) {
        this.title = title;
        this.desc = desc;
        this.list = list;
    }
    public void play() {
        System.out.println("title : " + title);
        System.out.println("desc : " + desc);
        System.out.println();
        for (String data : list) {
            System.out.println(data);
        }
    }
}

2、创建配置类

@Configuration
@Import(CDPlayerConfig.class)
@ImportResource("classpath:bean.xml")
public class JavaAndXmlConfig {
}

• 说明：
• @ImportResource("classpath:bean.xml")：注入配置文件

3、创建配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="mediaPlayer" class="com.demo.MediaPlayer">
        <constructor-arg value="test-title" name="title"/>
        <constructor-arg name="desc" value="test-desc"/>
        <constructor-arg name="list">
            <list>
                <value>test-list-1</value>
                <value>test-list-2</value>
                <value>test-list-3</value>
            </list>
        </constructor-arg>
    </bean>
    
</beans>

4、创建测试类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = JavaAndXmlConfig.class)
public class JavaAndXmlConfigTest {
    @Autowired
    private MediaPlayer mediaPlayer;
    @Autowired
    private CDPlayerConfig cdPlayerConfig;
    @Autowired
    private CDConfig cdConfig;
    @Test
    public void getMedia() {
        mediaPlayer.play();
    }
    @Test
    public void getBean() {
        CompactDisc compactDisc = cdConfig.compactDisc();
        CDPlayer cdPlayer = cdPlayerConfig.cdPlayer(compactDisc);
        cdPlayer.play();
    }
}

• 说明：
• JavaAndXmlConfig配置类中注入了CDPlayerConfig和CDConfig和配置文件，因此可以直接注入CDPlayerConfig，CDConfig，MediaPlayer