JFreeChart饼图(PieChart)

public void getJFreeChart(){response = ServletActionContext.getResponse();DefaultPieDataset dataSet = new DefaultPieDataset();if (!jobList.isEmpty()){       //测试数据dataSet.setValue("Failed", new Double(0.25));dataSet.setValue("Executing", new Double(0.25));dataSet.setValue("Completed", new Double(0.25));dataSet.setValue("Scheduled", new Double(0.25));}JFreeChart freeChar = ChartFactory.createPieChart3D("JOB EXECUTION STATUS",    dataSet,    false,                                true,                               false);getPiePlot(freeChar);getLegendTitle(freeChar);response.setContentType("image/jpeg");try{ServletOutputStream stream = response.getOutputStream();ChartUtilities.writeChartAsJPEG(stream, freeChar, 550, 300,null);stream.flush();stream.close(); }catch (IOException e) {e.printStackTrace();}}private PiePlot getPiePlot(JFreeChart freeChar){PiePlot3D piePlot = (PiePlot3D)freeChar.getPlot();piePlot.setOutlineVisible(false);piePlot.setNoDataMessage("No data");piePlot.setIgnoreNullValues(true);piePlot.setIgnoreZeroValues(true);piePlot.setStartAngle(90);piePlot.setLabelGap(0.02D);piePlot.setForegroundAlpha(0.7f);piePlot.setBackgroundPaint(Color.WHITE);  piePlot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0} {2}",                NumberFormat.getNumberInstance(),new DecimalFormat("0.00%")));piePlot.setSectionPaint("Scheduled", Color.yellow);piePlot.setSectionPaint("Failed", Color.red);piePlot.setSectionPaint("Completed", Color.green);piePlot.setSectionPaint("Executing", Color.blue);return piePlot;}private LegendTitle getLegendTitle(JFreeChart freeChar){        LegendTitle legendTitle = new LegendTitle(freeChar.getPlot());        BlockContainer blockcontainer = new BlockContainer(new BorderArrangement());        BlockContainer blockcontainer1 = legendTitle.getItemContainer();        blockcontainer1.setPadding(2D, 10D, 5D, 2D);        blockcontainer.add(blockcontainer1);        legendTitle.setWrapper(blockcontainer);        legendTitle.setPosition(RectangleEdge.RIGHT);        legendTitle.setHorizontalAlignment(HorizontalAlignment.LEFT);        freeChar.addSubtitle(legendTitle);        return legendTitle;}