How to create a pie chart with jsp/servlet?

Question

I want to create a servlet which can be used like below:
<img src="pieservlet?param1=<%=x%>&param2=<%=y%>&..." width="100" height="100" >
can you give me some guide?

Answer 1

Hai ,
I have implemented a trial working pie chart , dynamically created from jsp using ServletOutputStream , BufferedImage & JPEGImageEncoder (found in com.sun.image.codec.jpeg.* package & bundled along with jdk ) .
<%
ServletOutputStream sout = response.getOutputStream();
response.setContentType("image/jpeg");
BufferedImage img = new BufferedImage(400,400,BufferedImage.TYPE_INT_RGB);
Graphics2D gr = img.createGraphics();
/* Actually this will be got as values of request.getParameter */
Vector values = new Vector();
values.addElement(new String("45") );
values.addElement(new String("125") );
values.addElement(new String("75") );
values.addElement(new String("25") );
values.addElement(new String("90") );
// my demo class      
temp.pieChart fr = new temp.pieChart(400,400,values);
/* This pieChart is class extends JFrame , in paint method of it all Drawing of pie chart using graphics2D fillArc done */
fr.paint(gr);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sout);
encoder.encode(img);
sout.flush();
%>
Hope this helps to build your own custom pie chart .
Let me know if details needed on pieChart class
rakesh