Use image of E-mail to avoid spam mail.

Everyone knows how irritated spam mails are. Spammer can use robot program to crawl through websites (e.g. find <a href="mailto:me@myemail.xyz">). One very simple way to fight the robot program is to use image files to replace the E-mail address.
Here is a simple program to create an E-mail image

import javax.imageio.*;
import java.io.*;
import java.awt.image.*;
import java.awt.*;

public class EmailImage {
    
    public static void main(String[] args) {
        int width = 200; // numbers by trial and error
        int height = 20;
        String email = "me@myemail.xyz";
        String imageName = "xyz.png";      
        
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = bi.createGraphics();
        // setbackgroud color
        Color background = Color.white;
        g2.setColor(background);
        g2.fillRect(0,0, width, height);
               
        g2.setColor(Color.black);
        g2.setFont(new Font("Serif", Font.PLAIN, 16));
        int x = 2, y = height - 5; // (x,y) coordinate, 
                                   // the numbers are figured out by trial and error
        g2.drawString(email, x ,y);
 
        File f = new File(imageName);
        try {
                // png is an image format (like gif or jpg)
                ImageIO.write(bi, "png", f);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }    
}

After you run this program you will get the following image

xyz.png

Here is another program. You don't have to figure out the height, width etc. The program will determine the bound of the E-mail at the run time.

import java.awt.geom.Rectangle2D;
import javax.imageio.*;
import java.io.*;
import java.awt.image.*;
import java.awt.*;

public class EmailImage2 {
    
    public static void main(String[] args) {
        // the number here doesn't really matter
        int width = 500, height = 500, x = 0, y = 0;
        
        String email = "me@myemail.xyz"; // your E-mail
        String imageName = "xyz.png"; // output picture
        // Font font = new Font("Serif", Font.PLAIN, 16); // font that you use
        Font font = new Font("impact", Font.PLAIN, 16);
       
        // create a graphics, only used to create FontMetrics
        // FontMetrics is used to find out the height, width of the String
        // when you draw the String on the graphics. 
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = bi.createGraphics();
        FontMetrics fm = g2.getFontMetrics(font);
        Rectangle2D rect= fm.getStringBounds(email, g2);
        height = (int)rect.getHeight();
        width = (int)rect.getWidth();
        x = 0;
        y = - (int)(rect.getY());
        
        // now we get the real height and width of the E-mail
        bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        g2 = bi.createGraphics();

        
        // setbackgroud color
        Color background = Color.white;
        g2.setColor(background);
        g2.fillRect(0,0, width, height);
        
        g2.setColor(Color.black);
        g2.setFont(font);
        g2.drawString(email, x ,y);
        
        File f = new File(imageName);
        try {
            // png is an image format (like gif or jpg)
            ImageIO.write(bi, "png", f);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}