code: public static byte[] gzipUncompress(byte[] bytes) {
  		if (bytes == null || bytes.length == 0) {
  			return null;
  		}
  		ByteArrayOutputStream out = new ByteArrayOutputStream();
  		ByteArrayInputStream in = new ByteArrayInputStream(bytes);
  		try {
  			GZIPInputStream ungzip = new GZIPInputStream(in);
  			byte[] buffer = new byte[256];
  			int n;
  			while ((n = ungzip.read(buffer)) >= 0) {
  				out.write(buffer, 0, n);
  			}
  		} catch (IOException e) {
  		}
  
  		return out.toByteArray();
  	}
docs: GZIP解压缩
  
  @param bytes
  @return