1.
package soundsystem;
import org.springframework.beans.factory.annotation.Autowired; public class CDPlayer implements MediaPlayer {
private CompactDisc cd; @Autowired
public CDPlayer(CompactDisc cd) {
this.cd = cd;
} public void play() {
cd.play();
} }
2.
public class SgtPeppers implements CompactDisc {
private String title = "Sgt. Pepper's Lonely Hearts Club Band";
private String artist = "The Beatles";
public void play() {
System.out.println("Playing " + title + " by " + artist);
}
}
3.
package soundsystem;
import java.util.List;
public class BlankDisc implements CompactDisc {
private String title;
private String artist;
private List<String> tracks;
public BlankDisc(String title, String artist, List<String> tracks) {
this.title = title;
this.artist = artist;
this.tracks = tracks;
}
public void play() {
System.out.println("Playing " + title + " by " + artist);
for (String track : tracks) {
System.out.println("-Track: " + track);
}
}
}
一、在Java配置文件中引入Java配置文件
1.
package soundsystem; import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration; @Configuration
public class CDConfig {
@Bean
public CompactDisc compactDisc() {
return new SgtPeppers();
}
}
2.则在CDPlayerConfig中可直接用@import引入上面的配置或新建一个文件引入这两个配置文件
(1)
@Configuration
@Import(CDConfig.class)
public class CDPlayerConfig {
@Bean
public CDPlayer cdPlayer(CompactDisc compactDisc) {
return new CDPlayer(compactDisc);
}
}
(2)
package soundsystem;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@Configuration
@Import({CDPlayerConfig.class, CDConfig.class})
public class SoundSystemConfig {
}
二、在Java配置文件中引入xml配置文件，可用@ImportResource
1.cd-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:c="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="compactDisc"
class="soundsystem.BlankDisc"
c:_0="Sgt. Pepper's Lonely Hearts Club Band"
c:_1="The Beatles">
<constructor-arg>
<list>
<value>Sgt. Pepper's Lonely Hearts Club Band</value>
<value>With a Little Help from My Friends</value>
<value>Lucy in the Sky with Diamonds</value>
<value>Getting Better</value>
<value>Fixing a Hole</value>
<!-- ...other tracks omitted for brevity... -->
</list>
</constructor-arg>
</bean> </beans>
2.SoundSystemConfig.java
package soundsystem; import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.ImportResource; @Configuration
@Import(CDPlayerConfig.class)
@ImportResource("classpath:cd-config.xml")
public class SoundSystemConfig { }
Both beans— CDPlayer configured in JavaConfig and BlankDisc configured in XML —
will be loaded into the Spring container. And because CDPlayer ’s @Bean method
accepts a CompactDisc as a parameter, the BlankDisc bean will be wired into it, even
though it’s configured in XML .