import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.GZIPOutputStream;
public class Main {
public static void main(String[] argv) throws Exception {
GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream("outfile.gzip"));
FileInputStream in = new FileInputStream("infilename");
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.finish();
out.close();
}
}