JFreeChart饼图(PieChart)

最新推荐文章于 2022-11-25 09:30:51 发布

Gino_Zhang

最新推荐文章于 2022-11-25 09:30:51 发布

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分类专栏： JAVA 文章标签： jfreechart dataset stream null 测试

本文链接：https://blog.youkuaiyun.com/Gino_Zhang/article/details/6702981

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	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;
	}