[ Java 常見問題 ] Compress directory to tar.gz with commons compress

Source From Here 
Question 
I'm running into a problem using the Commons compress library to create a tar.gz of a directory. 

How-To 
Below is sample code: 

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1. package howto;  
2.   
3. import java.io.BufferedOutputStream;  
4. import java.io.File;  
5. import java.io.FileInputStream;  
6. import java.io.FileOutputStream;  
7. import java.io.IOException;  
8.   
9. import org.apache.commons.compress.archivers.tar.TarArchiveEntry;  
10. import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;  
11. import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;  
12. import org.apache.commons.compress.utils.IOUtils;  
13.   
14. public class TarDirectory {  
15.     private static void AddFileToTarGz(TarArchiveOutputStream tOut, File f, String base) throws IOException {                          
16.         String entryName = base + f.getName();  
17.         System.out.printf("\tAdd entry...%s\n", entryName);  
18.         TarArchiveEntry tarEntry = new TarArchiveEntry(f, entryName);  
19.         tOut.putArchiveEntry(tarEntry);  
20.   
21.         if (f.isFile())   
22.         {  
23.             IOUtils.copy(new FileInputStream(f), tOut);  
24.             tOut.closeArchiveEntry();  
25.         } else {  
26.             tOut.closeArchiveEntry();  
27.             File[] children = f.listFiles();  
28.             if (children != null){  
29.                 for (File child : children)   
30.                 {                     
31.                     AddFileToTarGz(tOut, child, entryName + "/");  
32.                 }  
33.             }  
34.         }  
35.     }  
36.       
37.     public static void main(String[] args) throws Exception{  
38.         if(args.length<2)  
39.         {  
40.             System.out.printf("\t[Info] Please give argument1 as directory; argument2 as output tar file.\n");  
41.             return;  
42.         }  
43.           
44.         File outFile = new File(args[1]);  
45.         File dir = new File(args[0]);  
46.           
47.         FileOutputStream fOut=null;  
48.         BufferedOutputStream bOut=null;  
49.         GzipCompressorOutputStream gzOut=null;  
50.         TarArchiveOutputStream tOut=null;  
51.         try{              
52.             fOut = new FileOutputStream(outFile);  
53.             bOut = new BufferedOutputStream(fOut);  
54.             gzOut = new GzipCompressorOutputStream(bOut);  
55.             tOut = new TarArchiveOutputStream(gzOut);  
56.             AddFileToTarGz(tOut, dir , "");  
57.         } finally {  
58.             if(tOut!=null) {  
59.                 tOut.finish();  
60.                 tOut.close();  
61.                 gzOut.close();  
62.                 bOut.close();  
63.                 fOut.close();  
64.             }                          
65.         }  
66.     }  
67. }  

Execution example: 

$ ls dir
abc.txt test.txt
$ java -jar TestJava7.jar
[Info] Please give argument1 as directory; argument2 as output tar file.
$ java -jar TestJava7.jar dir dir.tar.gz
Add entry...dir
Add entry...dir/abc.txt
Add entry...dir/test.txt
$ cp dir.tar.gz abc
$ tar -xvf abc/dir.tar.gz
dir/
dir/abc.txt
dir/test.txt