1. import java.io.File;  
2. import java.io.FileOutputStream;  
3. import de.innosystec.unrar.Archive;  
4. import de.innosystec.unrar.rarfile.FileHeader;  
5. public class UnRARTools {  
6.     public void unrar(File sourceRar, File destDir) throws Exception {  
7.         Archive archive = null;  
8.         FileOutputStream fos = null;  
9.         System.out.println("Starting...");  
10.         try {  
11.             archive = new Archive(sourceRar);  
12.             FileHeader fh = archive.nextFileHeader();  
13.             int count = 0;  
14.             File destFileName = null;  
15.             while (fh != null) {  
16.                 System.out.println((++count) + ") " + fh.getFileNameString());  
17.                 String compressFileName = fh.getFileNameString().trim();  
18.                 destFileName = new File(destDir.getAbsolutePath() + "/" + compressFileName);  
19.                 if (fh.isDirectory()) {  
20.                     if (!destFileName.exists()) {  
21.                         destFileName.mkdirs();  
22.                     }  
23.                     fh = archive.nextFileHeader();  
24.                     continue;  
25.                 }   
26.                 if (!destFileName.getParentFile().exists()) {  
27.                     destFileName.getParentFile().mkdirs();  
28.                 }  
29.                 fos = new FileOutputStream(destFileName);  
30.                 archive.extractFile(fh, fos);  
31.                 fos.close();  
32.                 fos = null;  
33.                 fh = archive.nextFileHeader();  
34.             }  
35.             archive.close();  
36.             archive = null;  
37.             System.out.println("Finished !");  
38.         } catch (Exception e) {  
39.             throw e;  
40.         } finally {  
41.             if (fos != null) {  
42.                 try {  
43.                     fos.close();  
44.                     fos = null;  
45.                 } catch (Exception e) {  
46.                     //ignore  
47.                 }  
48.             }  
49.             if (archive != null) {  
50.                 try {  
51.                     archive.close();  
52.                     archive = null;  
53.                 } catch (Exception e) {  
54.                     //ignore  
55.                 }  
56.             }  
57.         }  
58.     }  
59. }  

需要引用到以下兩個lib.
java-unrar-0.5.jar
http://www.java2s.com/Code/JarDownload/java/java-unrar-0.5.jar.zip
apache-commons-logging.jar
http://www.java2s.com/Code/JarDownload/apache-commons/apache-commons-logging.jar.zip