<%@ page contentType="text/html;charset=GBK"%>
<%@ page
import="org.jfree.chart.*,org.jfree.chart.servlet.ServletUtilities,
org.jfree.util.Rotation,org.jfree.data.general.DefaultPieDataset,
org.jfree.chart.plot.PiePlot3D,org.jfree.chart.title.TextTitle,
java.awt.Font,org.jfree.chart.plot.PiePlot"%>
<%
//设置数据集
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("初中高级程序员", 0.52);
dataset.setValue("项目经理", 0.1);
dataset.setValue("系统分析师", 0.1);
dataset.setValue("软件架构师", 0.1);
dataset.setValue("其他", 0.18);
//通过工厂类生成JFreeChart对象
JFreeChart chart = ChartFactory.createPieChart3D("IT行业职业分布图",
dataset, true, true, false);
//获得3D的水晶图对象
PiePlot3D pieplot3d = (PiePlot3D) chart.getPlot();
//设置开始角度
pieplot3d.setStartAngle(150D);
//设置方向为“顺时针方向”
pieplot3d.setDirection(Rotation.CLOCKWISE);
//设置透明度,0.5F为半透明,1为不透明,0为全透明
pieplot3d.setForegroundAlpha(0.5F);
//没有数据的时候显示的内容
pieplot3d.setNoDataMessage("无数据显示");
//标题文字乱码 IT行业职业分布图
TextTitle textTitle = chart.getTitle();
textTitle.setFont(new Font("宋体", Font.PLAIN, 20));
//饼上的文字乱码
PiePlot plot = (PiePlot) chart.getPlot();
plot.setLabelFont(new Font("宋体", Font.PLAIN, 12));
//图例文字乱码 饼图下面的5个说明
chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,
null, session);
String graphURL = request.getContextPath()
+ "/DisplayChart?filename=" + filename;
%>
<html>
<head>
<title>饼状图3(水晶饼图)</title>
</head>
<body>
<img src="<%=graphURL%>" width=500 height=300 border=0
usemap="#<%= filename %>">
</body>
</html>
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