<dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-vfs2</artifactId>
   <version>2.0</version>
</dependency>

import java.io.File;
import java.io.IOException;
import java.net.URI;
 
import org.apache.commons.vfs2.AllFileSelector;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.VFS;
 
public class ZipfileUnpacker
{
   private final FileSystemManager fileSystemManager;
   private final URI packLocation;
 
   public ZipfileUnpacker(final URI packLocation) throws FileSystemException
   {
      this.fileSystemManager = VFS.getManager();
      this.packLocation = packLocation;
   }
 
   @Override
   public void unpack(final File outputDir) throws IOException
   {
      outputDir.mkdirs();
 
      final FileObject packFileObject = fileSystemManager.resolveFile(packLocation.toString());
      try
      {
         final FileObject zipFileSystem = fileSystemManager.createFileSystem(packFileObject);
         try
         {
            fileSystemManager.toFileObject(outputDir).copyFrom(zipFileSystem, new AllFileSelector());
         }
         finally
         {
            zipFileSystem.close();
         }
      }
      finally
      {
         packFileObject.close();
      }
   }
}