Java tutorial
import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.zip.GZIPOutputStream; public class Main { public static void main(String[] args) throws Exception { InputStream fin = new FileInputStream("a.dat"); OutputStream fout = new FileOutputStream("a.dat.gz"); GZIPOutputStream gzout = new GZIPOutputStream(fout); for (int c = fin.read(); c != -1; c = fin.read()) { gzout.write(c); } gzout.close(); } }