import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.*;
// Note another alternative is to write out a GIF using the http://www.acme.com/java/ GIFEncoder
public class JPEGServlet extends HttpServlet {

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response)
       throws    ServletException, IOException {
        response.setContentType("image/jpeg");
        ServletOutputStream out = response.getOutputStream();
        BufferedImage image = new BufferedImage(100,100, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        g.setColor(Color.green);
        g.fillRect(0, 0, 100, 100);
        g.setColor(Color.red);
        g.drawOval(0, 0, 100,100);
        JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(out);
        encoder.encode(image);
        out.close();
    }
    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        doGet(request,response);
    }
    //Get Servlet information
    public String getServletInfo() {
        return "JPEGServlet Information";
    }
}