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.

 1 public class SgtPeppers implements CompactDisc {
 2 
 3   private String title = "Sgt. Pepper's Lonely Hearts Club Band";  
 4   private String artist = "The Beatles";
 5   
 6   public void play() {
 7     System.out.println("Playing " + title + " by " + artist);
 8   }
 9 
10 }

3.

 1 package soundsystem;
 2 
 3 import java.util.List;
 4 
 5 public class BlankDisc implements CompactDisc {
 6 
 7   private String title;
 8   private String artist;
 9   private List<String> tracks;
10 
11   public BlankDisc(String title, String artist, List<String> tracks) {
12     this.title = title;
13     this.artist = artist;
14     this.tracks = tracks;
15   }
16 
17   public void play() {
18     System.out.println("Playing " + title + " by " + artist);
19     for (String track : tracks) {
20       System.out.println("-Track: " + track);
21     }
22   }
23 
24 }

 

一、在Java配置文件中引入Java配置文件

1.

 1 package soundsystem;
 2 
 3 import org.springframework.context.annotation.Bean;
 4 import org.springframework.context.annotation.Configuration;
 5 
 6 @Configuration
 7 public class CDConfig {
 8   @Bean
 9   public CompactDisc compactDisc() {
10     return new SgtPeppers();
11   }
12 }

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)

1 @Configuration
2 @Import(CDConfig.class)
3 public class CDPlayerConfig {
4 @Bean
5 public CDPlayer cdPlayer(CompactDisc compactDisc) {
6 return new CDPlayer(compactDisc);
7 }
8 }

(2)

1 package soundsystem;
2 import org.springframework.context.annotation.Configuration;
3 import org.springframework.context.annotation.Import;
4 @Configuration
5 @Import({CDPlayerConfig.class, CDConfig.class})
6 public class SoundSystemConfig {
7 }

 

二、在Java配置文件中引入xml配置文件，可用@ImportResource

1.cd-config.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4   xmlns:c="http://www.springframework.org/schema/c"
 5   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 6 
 7   <bean id="compactDisc"
 8         class="soundsystem.BlankDisc"
 9         c:_0="Sgt. Pepper's Lonely Hearts Club Band"
10         c:_1="The Beatles">
11     <constructor-arg>
12       <list>
13         <value>Sgt. Pepper's Lonely Hearts Club Band</value>
14         <value>With a Little Help from My Friends</value>
15         <value>Lucy in the Sky with Diamonds</value>
16         <value>Getting Better</value>
17         <value>Fixing a Hole</value>
18         <!-- ...other tracks omitted for brevity... -->
19       </list>
20     </constructor-arg>
21   </bean>
22 
23 </beans>

2.SoundSystemConfig.java

 1 package soundsystem;
 2 
 3 import org.springframework.context.annotation.Configuration;
 4 import org.springframework.context.annotation.Import;
 5 import org.springframework.context.annotation.ImportResource;
 6 
 7 @Configuration
 8 @Import(CDPlayerConfig.class)
 9 @ImportResource("classpath:cd-config.xml")
10 public class SoundSystemConfig {
11 
12 }

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 .

 

posted @ 2016-03-02 14:28  shamgod  阅读(1956)  评论(0)  编辑  收藏  举报
haha