How to use GZip propperly?

Question

I have been trying to make a program that zips a whole file at a time, I heard Gzip can do it, but the Java help thing does not show how to implement GZip
here is where I am so far am I going in the write direction?
Also is there a good Java book, with alot of example code in it?
import java.io.*;
import java.util.zip.*;
public class Compress {
public static void main(String[] args) throws IOException {
File dirf;
File filef;
File zipf;
Final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
//next 3 code segments gets the directory, original file and zip file names
System.out.print("Enter in the directory of the file here:> ");
dirf = new File(reader.readLine());
String directory = dirf;
System.out.print("Enter in the name of the file to be zipped here:> ");
filef = new File(reader.readLine());
String files = filef;
System.out.print("Enter in the enter in the name of the zip file here:> ");
zipf = new File(reader.readLine());
String zip = zipf;
//creates the zip file in the same directory as the old file
File dir = new File(directory);
File zipper = new File(dir, zip);
zipper.createNewFile();
//primes for input of the zip file from old file
GZIPOutputStream zipfile = new ZipOutputStream(
new FileOutputStream(zipper));

Answer 1

Yup, pretty much. (You could always accept the filenames from the command line using the arg[] parameter on main).
     public void zipAFile(File source, File target) throws IOException, FileNotFoundException
          FileInputStream fis = new FileInputStream(source);
          FileOutputStream fos = new FileOutputStream(target);
          GZIPOutputStream gzos = new GZIPOutputStream(fos);
          byte[] buffer = new byte[2048];
          int read = fis.read(buffer);
          while (read == 2048)
               gzos.write(buffer);
               read = fis.read(buffer);
          gzos.write(buffer, 0, read);
          // The next step is VERY important.  If you do not flush the buffer
          // on the inner (gzip) stream, the outer (file) stream will get
          // closed before it gets the last buffer of data.
          gzos.close();
          fis.close();
          fos.close();
     }Cheers!