jfreechart 折线图

准备工作在上一篇文章,
jsp代码：

<%
TimeSeriesCollection dataTimeSet = new TimeSeriesCollection();
			TimeSeries timesre = new TimeSeries("折线图", Day.class);
			
			

			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-01-02")), 1000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-02-02")), 2000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-03-02")), 3000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-04-02")), 2000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-05-02")), 4000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-06-02")), 5000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-07-02")), 6000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-08-02")), 9000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-09-02")), 1000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2009-10-02")), 2000);
			timesre.add(new Day(new SimpleDateFormat("yyyy-MM-dd").parse("2010-01-02")), 6000);
			dataTimeSet.addSeries(timesre);
			JFreeChart chartTime = ChartFactory.createTimeSeriesChart("折线图",
					"生产日期", "工作点数", dataTimeSet, true, true, false);
			chartTime.setBackgroundPaint(Color.white);
			XYPlot plot = (XYPlot) chartTime.getXYPlot();
			plot.setBackgroundPaint(Color.white);//设置网格背景色 
			plot.setDomainGridlinePaint(Color.LIGHT_GRAY);//设置网格竖线(Domain轴)颜色 
			plot.setRangeGridlinePaint(Color.LIGHT_GRAY);//设置网格横线颜色 
			plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));//设置曲线图与xy轴的距离 
			plot.setDomainCrosshairVisible(true);
			plot.setRangeCrosshairVisible(true);
			XYItemRenderer r = plot.getRenderer();
			if (r instanceof XYLineAndShapeRenderer) {
				XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
				renderer.setBaseShapesVisible(true);
				renderer.setBaseShapesFilled(true);
			}
			//设置Y轴 
			NumberAxis numAxis = (NumberAxis) plot.getRangeAxis();
			NumberFormat numFormater = NumberFormat.getNumberInstance();
			//设置显示值的小数点个数
			numFormater.setMinimumFractionDigits(2);
			numAxis.setNumberFormatOverride(numFormater);
			//设置Y周范围
			//numAxis.setLowerBound(200);
			//numAxis.setUpperBound(7000);
			
			//设置X轴（日期轴） 
			DateAxis axis = (DateAxis) plot.getDomainAxis();
			axis.setDateFormatOverride(new SimpleDateFormat("MM-dd"));
			ChartRenderingInfo info = new ChartRenderingInfo(
					new StandardEntityCollection());
			String fileName = ServletUtilities.saveChartAsPNG(chartTime, 600,
					350, info, session);//生成图片 

			//String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session); 
			String graphURL = request.getContextPath()
					+ "/servlet/DisplayChart?filename=" + fileName;
%>

同样页面中引用图片地址

<table>
						<tr align="center">
								<img src="<%=graphURL%>" width=500 height=300 border=0
									usemap="#map0">
						</tr>
					</table>

折线图结果:

评论

1 楼 hllf123 2011-12-06  

如果数据区显示出数据后怎么格式化数字呢？也就是去掉数字中间的逗号