code: public static void decompress(InputStream is, OutputStream os) throws Exception {
  		GZIPInputStream gis = new GZIPInputStream(is);
  		int count;
  		byte data[] = new byte[BUFFER];
  		while ((count = gis.read(data, 0, BUFFER)) != -1) {
  			os.write(data, 0, count);
  		}
  		gis.close();
  	}
docs: 数据解压缩
  @param is
  @param os
  @throws Exception