List<StreamedContent> does not work

RonaldoC7 · 01 Dec 2010, 22:17

Hi,

i want to generate dynamic chart images save them to a List object and display the images in the xhtml file.
I have created a small application to illustrate the problem.

Controller:

Code: Select all

public class DynamicPie {
	
	public DynamicPie(){	
	}
	
	public DefaultPieDataset createDataset(){
		 DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
	        defaultpiedataset.setValue("Java", new Double(43.200000000000003D));
	        defaultpiedataset.setValue("Visual Basic", new Double(10D));
	        defaultpiedataset.setValue("C/C++", new Double(17.5D));
	        defaultpiedataset.setValue("PHP", new Double(32.5D));
	        defaultpiedataset.setValue("Perl", null);
	        return defaultpiedataset;
	}
	
	public JFreeChart createPieCharts(DefaultPieDataset defaultpiedataset){
			JFreeChart jfreechart = ChartFactory.createPieChart3D("Pie Chart 3D demo ", defaultpiedataset, true, true, false);
			PiePlot3D pieplot3d = (PiePlot3D)jfreechart.getPlot();
	        pieplot3d.setStartAngle(290D);
	        pieplot3d.setDirection(Rotation.CLOCKWISE);
	        pieplot3d.setForegroundAlpha(0.5F);
	        pieplot3d.setNoDataMessage("No data to display");
		return jfreechart;
	}
	
	public StreamedContent generateImages(JFreeChart chart){
		StreamedContent pic = null;
			File chartFile = new File("dynmaicPie");
			try {
				ChartUtilities.saveChartAsPNG(chartFile, chart, 680, 600);
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				pic = new DefaultStreamedContent(new FileInputStream(chartFile), "image/png");
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
		return pic;
	}
	
	public List<StreamedContent> generateImageList(JFreeChart chart){
		System.out.println("list Gen start");
		StreamedContent pic = null;
		List<StreamedContent> picList = new ArrayList<StreamedContent>();
		for(int i=0; i<3; i++){
			File chartFile = new File("dynmaicTest"+i);
			try {
				ChartUtilities.saveChartAsPNG(chartFile, chart, 680, 600);
			} catch (IOException e) {
				e.printStackTrace();
			}
			try {
				pic = new DefaultStreamedContent(new FileInputStream(chartFile), "image/png");
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
			picList.add(pic);
		}
		System.out.println("list gen end");
		return picList;
	}
	
}

Bean

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@ManagedBean(name="dynamicPieBean")
@RequestScoped

public class DynamicPieBean implements Serializable{
	
	private static final long serialVersionUID = 42L;
	private StreamedContent image;
	private List<StreamedContent> imageList;
	
	
	
	
	public void generatePieChart(){
		System.out.println("simple chart");
		DynamicPie pie = new DynamicPie();
		DefaultPieDataset dataset = pie.createDataset();
		JFreeChart chart = pie.createPieCharts(dataset);
		StreamedContent pic = pie.generateImages(chart);
		this.image = pic;
	}
	
	
	public void generatePieList(){
		System.out.println("test");
		DynamicPie pie = new DynamicPie();
		DefaultPieDataset dataset = pie.createDataset();
		JFreeChart chart = pie.createPieCharts(dataset);
		List<StreamedContent> picList = pie.generateImageList(chart);
		this.imageList = picList;
	}
	
	
	public StreamedContent getImage() {
		this.generatePieChart();
		return image;
	}

	public void setImage(StreamedContent image) {
		this.image = image;
	}
	
	public List<StreamedContent> getImageList() {
		this.generatePieList();
		return imageList;
	}

	public void setImageList(List<StreamedContent> imageList) {
		this.imageList = imageList;
	}
}

xhtml:

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<html xmlns="http://www.w3c.org/1999/xhtml"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:p="http://primefaces.prime.com.tr/ui"
	xmlns:c="http://java.sun.com/jsp/jstl/core">
<h:head>
<title>index</title>
</h:head>
<h:body>
<h1>single Pie image</h1>
<br />
<p:graphicImage value="#{dynamicPieBean.image}"/>
<br/>

<h1>Pie image list</h1>
<c:forEach var="image" items="#{dynamicPieBean.imageList}">
                ListObjects: <p:graphicImage value="#{image}"/> <br />
</c:forEach>

</h:body>
</html>

I use the following libraries:
-commons-fileupload-1.2.2.jar
-commons-io.-2.0.jar
-jcommon-1.0.16.jar
-jsf-api.jar
-jsf-impl.jar
-primefaces-2.1.jar
-slf4j-api-1.6.1.jar

As you can see on the image the single Streamed Content is diplayed. But the images in the list object aren't displayed.

Uploaded with ImageShack.us

Has anyone experienced a similar problem or is there a posibility to display List<StreamedContent> in the frontend?

Thanks.

List<StreamedContent> does not work

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