java deflate压缩算法 JAVA中的deflate压缩实现方法

/**
   * 
   * @param inputByte
   *      待解压缩的字节数组
   * @return 解压缩后的字节数组
   * @throws IOException
   */
  public static byte[] uncompress(byte[] inputByte) throws IOException {
    int len = 0;
    Inflater infl = new Inflater();
    infl.setInput(inputByte);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    byte[] outByte = new byte[1024];
    try {
      while (!infl.finished()) {
        // 解压缩并将解压缩后的内容输出到字节输出流bos中
        len = infl.inflate(outByte);
        if (len == 0) {
          break;
        }
        bos.write(outByte, 0, len);
      }
      infl.end();
    } catch (Exception e) {
      //
    } finally {
      bos.close();
    }
    return bos.toByteArray();
  }

  /**
   * 压缩.
   * 
   * @param inputByte
   *      待压缩的字节数组
   * @return 压缩后的数据
   * @throws IOException
   */
  public static byte[] compress(byte[] inputByte) throws IOException {
    int len = 0;
    Deflater defl = new Deflater();
    defl.setInput(inputByte);
    defl.finish();
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    byte[] outputByte = new byte[1024];
    try {
      while (!defl.finished()) {
        // 压缩并将压缩后的内容输出到字节输出流bos中
        len = defl.deflate(outputByte);
        bos.write(outputByte, 0, len);
      }
      defl.end();
    } finally {
      bos.close();
    }
    return bos.toByteArray();
  }

  public static void main(String[] args) {
    try {
      FileInputStream fis = new FileInputStream("D:\\testdeflate.txt");
      int len = fis.available();
      byte[] b = new byte[len];
      fis.read(b);
      byte[] bd = compress(b);
      // 为了压缩后的内容能够在网络上传输，一般采用Base64编码
      String encodestr = Base64.encodeBase64String(bd);
      byte[] bi = uncompress(Base64.decodeBase64(encodestr));
      FileOutputStream fos = new FileOutputStream("D:\\testinflate.txt");
      fos.write(bi);
      fos.flush();
      fos.close();
      fis.close();
    } catch (Exception e) {
      //
    }
  }