Java通过gzip对字符串进行压缩和解压缩

public static String uncompressString(String str) throws IOException {      if (str == null ¦¦ str.length() == 0) {        return str;      }      ByteArrayOutputStream out = new ByteArrayOutputStream();      ByteArrayInputStream in = new ByteArrayInputStream(str          .getBytes("ISO-8859-1"));      GZIPInputStream gunzip = new GZIPInputStream(in);      byte[] buffer = new byte[256];      int n;      while ((n = gunzip.read(buffer)) >= 0) {        out.write(buffer, 0, n);      }      // toString()使用平台默认编码，也可以显式的指定如toString("GBK")      return out.toString();    }     public static void main(String[] args) throws IOException {      String a = compressString("China");      System.out.println(a);      System.out.println(a.length());      String b = uncompressString(a);      System.out.println(b);  }