[JCharts] Accessing Charts in JSP

[Philipp Otto]

Hey everybody,

i want to show simple charts in JSPs with the JCharts library.
I already know how to generate them in a Servlet.

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
		try {
			PieChart2D pieChart2D = new PieChart2D(this.getData(),
					this.legendProperties, this.chartProperties, this.width,
					this.height);
			ServletEncoderHelper.encodeJPEG13(pieChart2D, 1f, response);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

So if I open this servlet directly it displays the chart in the correct way. I just want to generate the chart in the servlet and then add it to the JSP. But how do I do that? I mean I can´t use getProperty like if I want to get a string so how can I access the encoded chart within the JSP?

Thanks for your help.

Philipp

[Tim Moores]

You would save the image to a publicly accessible place in the file system, and then add a link to that file to your JSP.

[Philipp Otto]

Thanks for your fast answer Tim :-)

I will try it but will the image be in the filesystem forever or is it just temporary for this session maybe? I mean if a lot of users want to see charts then there would be so many files in the file system.

Philipp

[Tim Moores]

If this was my problem I'd check out the cewolf tag library, which integrates chart generation and chart display with a JSP tag library. It can be set up to remove outdated images automatically (and also cache them, in case users request the same images over and over again).