How to display line graph using JFreeChart in jsp?

Question

HI All:
I am using the below to diplay the line graph. when i run the below code, i am getting the window but it is blank and not displaying the graph. Please help me

Answer 1

I did this some time ago as well, but I also have the code, so here's the clue..

As Thorbjørn Ravn Andersen said you have to have a servlet generating images instead of web pages. That means that your servlet's processRequest method looks something like this:

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        response.setContentType("image/png");
        ServletOutputStream os = response.getOutputStream();
        ImageIO.write(getChart(request), "png", os);
        os.close();
    }

private RenderedImage getChart(HttpServletRequest request) {
        String chart = request.getParameter("chart");
        // also you can process other parameters like width or height here
        if (chart.equals("myDesiredChart1")) {
            JFreeChart chart = [create your chart here];
            return chart.createBufferedImage(width, height)
        }

Then you can use this servlet as a source of image in other pages for example like this..

And you're done :)