Want to decompress ZIP file

Question

Hi,
I have a ZIP file that I want to read and decompress into
plain files, how can I do that ?
I've tried to learn how to read in files byte by byte,
is there any faster way?
Thanks,
Alex

Answer 1

the first example doesn't work correctly, here is a fixed version:
      * Unzip a ZIP/JAR file.
      * @param zipFile ZIP/JAR file to extract.
      * @param destinationDir Destination directory to unzip to.
      * @throws IOException
     public static void unzipFile(File zipFile, String destinationDir) throws IOException {
        final int BUFFER = 2048;
        if (zipFile != null && zipFile.exists() && destinationDir != null) {
            ZipInputStream zis = null;
            BufferedOutputStream bos = null;
            try {
                zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile.getAbsoluteFile())));
                ZipEntry entry = null;
                while((entry = zis.getNextEntry()) != null) {
                    if (entry.isDirectory()) { //directory
                        File dir = new File(destinationDir + File.separator + entry.getName());
                        dir.mkdirs();
                    } else { //file
                        int count;
                        byte data[] = new byte[BUFFER];
                        FileOutputStream fos = new FileOutputStream(destinationDir + File.separator + entry.getName());
                        bos = new BufferedOutputStream(fos, BUFFER);
                        while ((count = zis.read(data, 0, BUFFER)) != -1) {
                            bos.write(data, 0, count);
                        bos.flush();
                zis.close();
            } finally {
                if (bos != null) { try { bos.close(); } catch (IOException ioe) { /* ignore */ } }
                if (zis != null) { try { zis.close(); } catch (IOException ioe) { /* ignore */ } }
        }//else: input value unavailable
    }//unzipFile()