JavaWatermarkingScript

watermark.java

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;


public class wartermarker {

    /**
     *
     * A rule from {@link java.awt.AlphaComposite}
     * preferably {@link java.awt.AlphaComposite#SRC_OVER}
     */
    private int alphaCompositeRule;
    /**
     * The opacity of the watermark
     * @see java.awt.AlphaComposite#getInstance(int, float)
     */
    private float alpha;

    private AlphaComposite alc ;


    /**
     *
     * This method  converts a multiline string into an ArrayList of Strings
     * Each item on the array list is a line of the string.
     * @param str A multiline string
     * @return An ArrayList of strings , a string per line of text
     * @see java.util.ArrayList
     */
    private static ArrayList<String> convertStringToLineString(String str){
        ArrayList<String> string = new ArrayList<String>();
        String s = new String ();
        char [] ca = str.toCharArray();

        for(int i=0;i<ca.length;i++){
            if(ca[i] == '\n'){
                string.add(s);
                s = new String();
            }
            s += ca[i];
        }
        return string;
    }


    public static void main(String []args) throws IOException, ArrayIndexOutOfBoundsException{
        final String  src_img_name = args[0];
        File image = new File(src_img_name);
        if(! image.exists())
            throw new FileNotFoundException("The Specified File was not found");

        ImageIcon img = new ImageIcon(args[0]);

        BufferedImage bufferedImage = new BufferedImage(
                img.getIconWidth(),img.getIconHeight(),BufferedImage.TYPE_INT_RGB);

        Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
        g2d.drawImage(img.getImage(), 0, 0, null);
        AlphaComposite alc = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.5f);
        g2d.setColor(Color.white);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2d.setFont(new Font("Arial",Font.BOLD,15));

        String watermark = jCal.getMonthlyCalender(11,2011);

        FontMetrics fontMetrics = g2d.getFontMetrics();

        Rectangle2D rect = fontMetrics.getStringBounds(watermark, g2d);

        int x =(img.getIconWidth() - (int) rect.getWidth()) / 2,
            y =(img.getIconHeight() - (int) rect.getHeight()) / 2;

        ArrayList<String> watermarks = convertStringToLineString(watermark);
        for (String w : watermarks){
        g2d.drawString(w,x,y);
            y+=20;
        }
         //Free graphic resources
            g2d.dispose();
        BufferedOutputStream bo = new BufferedOutputStream(
                new FileOutputStream("watermarked_"+image.getName() ) );
        ImageIO.write(bufferedImage,"jpg",bo);


    }


}