java.util.zip example

So many of you not aware how to use java.util.zip package to compress and uncompress the data. So here are some utility methods for your understanding

public static byte [] zip (byte[] uncompressedData, int off, int len)
{
Deflater compressor = new Deflater();
compressor.setLevel(Deflater.BEST_COMPRESSION);
compressor.setInput(uncompressedData, off, len);
compressor.finish();

ByteArrayOutputStream bos = new ByteArrayOutputStream(len);

byte[] buf = new byte[1024];
while (!compressor.finished())
{
int count = compressor.deflate(buf);
bos.write(buf, 0, count);
}
try
{
bos.close();
}
catch (IOException e)
{
}
return bos.toByteArray();
}

public static byte [] unzip (byte [] compressedData, int off, int len)
{
Inflater decompressor = new Inflater();
decompressor.setInput(compressedData, off, len);

ByteArrayOutputStream bos = null;
bos = new ByteArrayOutputStream(len);

// Decompress the data
byte[] buf = new byte[1024];
while (!decompressor.finished())
{
try
{
int count = decompressor.inflate(buf);
bos.write(buf, 0, count);
}
catch (DataFormatException e)
{
}
}
try
{
bos.close();
}
catch (IOException e)
{
}

return bos.toByteArray();
}