scatterchart.jsp

JFreeChart开发全攻略,JFreeChart开发全攻略

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ page import="org.jfree.chart.*,
                 org.jfree.chart.servlet.ServletUtilities,
                 statistical.ScatterDataset,
                 org.jfree.chart.plot.PlotOrientation,
                 org.jfree.chart.plot.XYPlot,
                 org.jfree.chart.renderer.xy.XYDotRenderer,
                 org.jfree.chart.axis.NumberAxis"%>
<%
JFreeChart jfreechart = ChartFactory.createScatterPlot("离散图示例",
					"X",
					"Y",
					new ScatterDataset(),
					PlotOrientation.VERTICAL,
					true,
					true,
					false);
//设置图形的渲染器
XYPlot xyplot = (XYPlot) jfreechart.getPlot();
XYDotRenderer xydotrenderer = new XYDotRenderer();
xydotrenderer.setDotWidth(2);
xydotrenderer.setDotHeight(2);
xyplot.setRenderer(xydotrenderer);

//设置Y轴属性
NumberAxis numberaxis = (NumberAxis) xyplot.getDomainAxis();
numberaxis.setAutoRangeIncludesZero(false);

String filename = ServletUtilities.saveChartAsPNG(jfreechart, 400, 300, null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width="400" height="300" border="0" usemap="#<%= filename %>">