Java Deflater compress

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;

public class Main {
  public static void main(String[] args) throws Exception {
    String input = "Hello world from demo2s.com!";
    byte[] uncompressedData = input.getBytes("UTF-8");

    byte[] compressedData = compress(uncompressedData,
        Deflater.BEST_COMPRESSION, false);

    byte[] decompressedData = decompress(compressedData, false);

    String output = new String(decompressedData, "UTF-8");
    //from w ww  . ja v  a  2  s  . c o  m
    System.out.println(output);
  }

  public static byte[] compress(byte[] input, int compressionLevel,
      boolean GZIPFormat) throws IOException {
    Deflater compressor = new Deflater(compressionLevel, GZIPFormat);

    compressor.setInput(input);

    compressor.finish();

    ByteArrayOutputStream bao = new ByteArrayOutputStream();
    byte[] readBuffer = new byte[1024];
    int readCount = 0;

    while (!compressor.finished()) {
      readCount = compressor.deflate(readBuffer);
      if (readCount > 0) {
        bao.write(readBuffer, 0, readCount);
      }
    }

    compressor.end();
    return bao.toByteArray();
  }

  public static byte[] decompress(byte[] input, boolean GZIPFormat)
      throws IOException, DataFormatException {
    Inflater decompressor = new Inflater(GZIPFormat);
    decompressor.setInput(input);
    ByteArrayOutputStream bao = new ByteArrayOutputStream();
    byte[] readBuffer = new byte[1024];
    int readCount = 0;

    while (!decompressor.finished()) {
      readCount = decompressor.inflate(readBuffer);
      if (readCount > 0) {
        bao.write(readBuffer, 0, readCount);
      }
    }
    decompressor.end();
    return bao.toByteArray();
  }
}