V> Does anybody have a good article/source as how to create dynamic
V> images/graphs using servlets.
try this example
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;
import java.util.*;
public class MakeImage extends HttpServlet {
public void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("image/jpeg");
// Create image
int width=200, height=200;
BufferedImage image = new BufferedImage(
width, height, BufferedImage.TYPE_INT_RGB);
// Get drawing context
Graphics g = image.getGraphics();
// Fill background
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
// Create random polygon
Polygon poly = new Polygon();
Random random = new Random();
for (int i=0; i < 20; i++) {
poly.addPoint(random.nextInt(width),
random.nextInt(height));
}
// Fill polygon
g.setColor(Color.cyan);
g.fillPolygon(poly);
// Dispose context
g.dispose();
// Send back image
ServletOutputStream sos =
response.getOutputStream();
JPEGImageEncoder encoder =
JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
}
}
Delivering Dynamic Images from JavaServer PagesTM (JSPTM) Technology.
http://java.sun.com/jdc/JDCTechTips/2001/tt0821.html
--
Best regards,
Yuriy
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