code: public static void unzip(InputStream is, File destDir)
              throws FileNotFoundException, IOException {
          BufferedOutputStream dest = null;
          ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
          ZipEntry entry;
          while ((entry = zis.getNextEntry()) != null) {
              //System.out.println("Extracting: " + entry);
              if (entry.isDirectory()) {
                  // Otherwise, empty directories do not get created
                  (new File(destDir, entry.getName())).mkdirs();
              } else {
                  File f = new File(destDir, entry.getName());
                  f.getParentFile().mkdirs();
                  int count;
                  byte data[] = new byte[BUFFER];
                  // write the files to the disk
                  FileOutputStream fos = new FileOutputStream(f);
                  dest = new BufferedOutputStream(fos, BUFFER);
                  while ((count = zis.read(data, 0, BUFFER)) != -1) {
                      dest.write(data, 0, count);
                  }
                  dest.flush();
                  dest.close();
              }
          }
          zis.close();
      }
docs: Unzips the InputStream to the given destination directory.
  
  @param is
  @param destDir
  @throws FileNotFoundException
  @throws IOException