How can I display a JFreeChart in web browser with Stripes Framework

Question

This is the situation: My \'metrics.jsp\' page submits a couple variables that are needed to create the chart. The \'ProjectActionBean.java\' calls down to a few other java

Answer 1

If you want to stay within the Stripes framework you can use a custom extension of the StreamingResolution, thusly:

Create a new normal ActionBean implementation that will represent the URL of your chart (to be included in your img tag):

@DefaultHandler
public Resolution view() {
    JFreeChart chart = ...
    return new ChartStreamingResolution(chart);
}

The custom StreamingResolution then looks like this:

public class ChartStreamingResolution extends StreamingResolution {
    private JFreeChart chart;
    public ChartStreamingResolution(JFreeChart chart) {
        super("image/png");
        this.chart = chart;
    }

    @Override
    public void stream(HttpServletResponse response) {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ChartUtilities.writeChartAsPNG(bos, chart, 400, 200);
            OutputStream out = new BufferedOutputStream(response.getOutputStream());
            out.write(bos.toByteArray());
            out.flush();
            out.close();
        } catch (Exception e) {
            //something sensible
        }
    }
}