This tip shows you how to zip files using Java.

Make sure the files you wish to zip are in the same directory as this program. Then specify the files you want zipped on the command line.

java Zip onefile.gif twofile.bmp threefile.txt > zipfile.zip

The above will add three files to the zipfile.

=============================================
import java.io.*;
import java.util.zip.*;

class Zip {
public static void main(String args[]) throws IOException {
byte b[] = new byte[512];
ZipOutputStream zout = new ZipOutputStream(System.out);
for(int i = 0; i < args.length; i ++) {
InputStream in = new FileInputStream(args[i]);
ZipEntry e = new ZipEntry(args[i].replace(File.separatorChar,'/'));
zout.putNextEntry(e);
int len=0;
while((len=in.read(b)) != -1) {
zout.write(b,0,len);
}
zout.closeEntry();
print(e);
}
zout.close();
}

public static void print(ZipEntry e){
PrintStream err = System.err;
err.print("added " + e.getName());
if (e.getMethod() == ZipEntry.DEFLATED) {
long size = e.getSize();
if (size > 0) {
long csize = e.getCompressedSize();
long ratio = ((size-csize)*100) / size;
err.println(" (deflated " + ratio + "%)");
}
else {
err.println(" (deflated 0%)");
}
}
else {
err.println(" (stored 0%)");
}
}
}