map Injection을 이용한 다운로더

아.. 진작에 이렇게 할것을...ㅜㅜ

 

downloadmanager-context.xml

1.  
2. <?xml version="1.0" encoding="UTF-8"?>
3. <beans xmlns="http://www.springframework.org/schema/beans"
4.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5.        xsi:schemaLocation="
6.                 http://www.springframework.org/schema/beans
7.                 http://www.springframework.org/schema/beans/spring-beans.xsd">
8. 
   
9.     <bean id="ftpDownloader" class="com.apress.prospring2.ch03.dm.FtpDownloader"/>
10.     <bean id="httpDownloader" class="com.apress.prospring2.ch03.dm.HttpDownloader"/>
11.     <bean id="sftpDownaloader" class="com.apress.prospring2.ch03.dm.SftpDownloader"/>
12.     <bean id="downloadManager" class="com.apress.prospring2.ch03.dm.DownloadManager">
13.         <property name="downloaders">
14.             <map>
15.                 <entry key="ftp" value-ref="ftpDownloader"/>
16.                 <entry key="http" value-ref="httpDownloader"/>
17.                 <entry key="sftp" value-ref="sftpDownaloader"/>
18.             </map>
19.         </property>
20.     </bean>
21. 
    
22. 
    
23. </beans>

 

Test Class : DownloadManager.java

1.  
2. package com.apress.prospring2.ch03.dm;
3. 
   
4. import org.springframework.beans.factory.xml.XmlBeanFactory;
5. import org.springframework.core.io.ClassPathResource;
6. 
   
7. import java.io.BufferedReader;
8. import java.io.IOException;
9. import java.io.InputStreamReader;
10. import java.util.Map;
11. import java.util.regex.Matcher;
12. import java.util.regex.Pattern;
13. 
    
14. /**
15.  * @author janm
16.  */
17. public class DownloadManager {
18. private static final Pattern URI_PATTERN = Pattern.compile("^([^:]*):/(.*)$");
19. private Map<String, Downloader> downloaders;
20. 
    
21. public static void main(String[] args) throws IOException {
22. XmlBeanFactory xbf = new XmlBeanFactory(new ClassPathResource(
23. "/META-INF/spring/downloadmanager-context.xml"));
24. DownloadManager dm = (DownloadManager) xbf.getBean("downloadManager");
25. BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
26. while (true) {
27. String uri = reader.readLine();
28. if (uri.length() == 0)
29. break;
30. dm.download(uri);
31. }
32. }
33. 
    
34. private void download(String uri) {
35. Matcher matcher = URI_PATTERN.matcher(uri);
36. if (matcher.matches()) {
37. String scheme = matcher.group(1); //reg Exp 를 이용하여 1번그룹 추출(http, ftp, sftp)
38. System.out.println(scheme);
39. String path = matcher.group(2);
40. Downloader downloader = this.downloaders.get(scheme); // downloaderManager bean의 Map에서 스키마를 꺼낸다
41. if (downloader != null) {
42. downloader.download(path);
43. }
44. }
45. }
46. public void setDownloaders(Map<String, Downloader> downloaders) {
47. this.downloaders = downloaders;
48. }
49. }

 

Interface Downloader.java

1.  
2. package com.apress.prospring2.ch03.dm;
3. public interface Downloader {
       byte[] download(final String uri);
4. }

 

구현체 FtpDownloader.java , HttpDownloader.java , sFtpDownLoader.java

1. package com.apress.prospring2.ch03.dm;
2. import org.springframework.stereotype.Component;
3. @Component
4. public class FtpDownloader implements Downloader {
5.     public byte[] download(String uri) {
6.         System.out.println("FTP Downloading " + uri);
7.         return new byte[0];
8.     }
9. }

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