Output Image using OutputStream

Question

All
There's a need to display a graph created by jFreeChart:
ChartUtilities.writeChartAsPNG(out, chart, width, height)It should display in a new window after pressing a Plot-Button in the application window.
How would one do this?
Basically I need to set the content type to 'image/png' and then I need a OutputStream which I can write to.
Where to begin? Is this possible at all? Alternatively one could put the graph to a file and then use that ;-(
Thanks a lot for any help

Answer 1

Well, not many suggestions eh?
I did this one (based on another post in the forum).
Just for those interested ;-)
    public String getPlotUrl() {
        log.debug("Creating a temporary Graph-File");
        ServletContext context = ( ServletContext ) getExternalContext().getContext();
        String realPath = context.getRealPath("/resources");
        File file = null;
        try {
            file = File.createTempFile( this.getHttpSession().getId(), ".png", new File( realPath ) );
        } catch (IOException e1) {
            e1.printStackTrace();
        file.deleteOnExit(  );
        OutputStream outs = null;
        try {
            outs = new BufferedOutputStream( new FileOutputStream( file ) );
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        ChartGenerator cg = new ChartGenerator(this.getRequestBean());
        cg.createChart();
        try {
            cg.printChart( outs );
        } catch (IOException e) {
            e.printStackTrace();
        try {
            outs.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        setPlotUrl( "/resources/" + file.getName());
        log.debug("Temp. File: " + this.plotUrl);
        return this.plotUrl;
    }