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