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Create barcode
import java.io.File;
import java.io.FileNotFoundException;

import net.sourceforge.barbecue.Barcode;
import net.sourceforge.barbecue.BarcodeException;
import net.sourceforge.barbecue.BarcodeFactory;
import net.sourceforge.barbecue.BarcodeImageHandler;
import net.sourceforge.barbecue.output.OutputException;

public class Program {

    /**
     * @param args
     * @throws FileNotFoundException
     * @throws BarcodeException
     * @throws OutputException
     */
    public static void main(String[] args) throws FileNotFoundException, BarcodeException, OutputException {
        // TODO Auto-generated method stub

        Barcode code = BarcodeFactory.create3of9("123456789", true);
        BarcodeImageHandler.savePNG(code, new File("barcode.png"));

    }

}
Library : http://barbecue.sourceforge.net/