line2.jsp

JFreeChart开发全攻略,JFreeChart开发全攻略

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import = "org.jfree.chart.ChartFactory,
				org.jfree.chart.JFreeChart,
				org.jfree.chart.servlet.ServletUtilities,
				java.awt.BasicStroke,
				org.jfree.chart.labels.StandardXYToolTipGenerator,
				org.jfree.chart.plot.PlotOrientation,
				org.jfree.chart.plot.XYPlot,
				org.jfree.chart.renderer.xy.XYStepRenderer,
				org.jfree.data.xy.*,
				java.awt.Font,
				org.jfree.chart.labels.StandardXYItemLabelGenerator,
				org.jfree.chart.axis.ValueAxis"%>

<%
//序列1的创建及其数据
XYSeries xyseries = new XYSeries("序列1");
xyseries.add(1.0D, 3D);
xyseries.add(2D, 4D);
xyseries.add(3D, 2D);
xyseries.add(6D, 3D);

//序列2的创建及其数据
XYSeries xyseries1 = new XYSeries("序列2");
xyseries1.add(1.0D, 7D);
xyseries1.add(2D, 6D);
xyseries1.add(3D, 9D);
xyseries1.add(4D, 5D);
xyseries1.add(6D, 4D);
XYSeriesCollection xydataset = new XYSeriesCollection();
xydataset.addSeries(xyseries);
xydataset.addSeries(xyseries1);

//通过createXYLineChart(...)创建JFreeChart曲线图对象
JFreeChart jfreechart = ChartFactory.createXYLineChart("阶梯图实例1",
					"X",
					"Y",
					xydataset,
					PlotOrientation.VERTICAL,
					true,
					true,
					false);
XYPlot xyplot = (XYPlot) jfreechart.getPlot();
XYStepRenderer xysteprenderer = new XYStepRenderer();
xysteprenderer.setBaseShapesVisible(true);
xysteprenderer.setSeriesStroke(0, new BasicStroke(2.0F));
xysteprenderer.setSeriesStroke(1, new BasicStroke(2.0F));

xysteprenderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
xysteprenderer.setDefaultEntityRadius(6);

//设置显示数字
xysteprenderer.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());
xysteprenderer.setBaseItemLabelsVisible(true);
xysteprenderer.setBaseItemLabelFont(new Font("Dialog", 1, 14));

//设置显示的数字的位置
ValueAxis valueaxis = xyplot.getRangeAxis();
valueaxis.setUpperMargin(0.14999999999999999D);

xyplot.setRenderer(xysteprenderer);

String filename = ServletUtilities.saveChartAsPNG(jfreechart, 600, 400, null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width="600" height="400" border="0" usemap="#<%= filename %>">