SPRING IN ACTION 第4版笔记-第二章WIRING BEANS-008-在Java配置文件中引入xml配置文件@Import、@ImportResource

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 .