line1.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,
				line.SampleXYDataset,
				org.jfree.chart.plot.PlotOrientation,
				org.jfree.chart.plot.XYPlot,
				org.jfree.chart.renderer.xy.XYLineAndShapeRenderer,
				org.jfree.data.xy.XYDataset"%>
				
<%
XYDataset xydataset = new SampleXYDataset();
JFreeChart jfreechart = ChartFactory.createXYLineChart("曲线图的例子——波形图",
					"X",
					"Y",
					xydataset,
					PlotOrientation.VERTICAL,
					true,
					true,
					false);
XYPlot xyplot = (XYPlot)jfreechart.getPlot();
xyplot.getDomainAxis().setLowerMargin(0.0D);
xyplot.getDomainAxis().setUpperMargin(0.0D);
XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)xyplot.getRenderer();
xylineandshaperenderer.setLegendLine(new java.awt.geom.Rectangle2D.Double(-4D, -3D, 8D, 6D));

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 %>">