<%    
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("Spring2.0宝典",47000);
data.setValue("轻量级J2EE企业应用实战",38000);
data.setValue("基于J2EE的Ajax宝典",31000);
data.setValue("JavaScript权威指南",29000);
data.setValue("Ajax In Action",25000);

//创建3D饼图的Plot对象
PiePlot3D plot = new PiePlot3D(data);    
plot.setLabelFont(new Font("隶书", Font.BOLD, 16));    
JFreeChart chart = new JFreeChart("",JFreeChart.DEFAULT_TITLE_FONT, plot, true);    
chart.setTitle(new TextTitle("图书销量统计图", new Font("黑体", Font.ITALIC , 22)));
//获取统计图表的图例对象
LegendTitle legend = chart.getLegend(0);
//修改图例的字体
legend.setItemFont(new Font("宋体", Font.BOLD, 13));
//生成饼图各部分的提示,当鼠标悬停时显示实际统计值。
plot.setToolTipGenerator(new StandardPieToolTipGenerator());    
//设定热点链接
plot.setURLGenerator(new StandardPieURLGenerator("b.jsp"));    
StandardEntityCollection entityCollection = new StandardEntityCollection();    
//生成RenderingInfo实例
ChartRenderingInfo info = new ChartRenderingInfo(entityCollection);    
//将页面输出流out包装成一个PrintWriter实例
PrintWriter pw = new PrintWriter(out);    
//在Web服务器的临时目录生成一张图片,720是图片长度,450是图片高度    
String filename = ServletUtilities.saveChartAsPNG(chart, 720, 450, info, null);    
//将图表的热点信息在HTML页面中输出,pw代表页面的输出流,map0是定义热点的Map标签ID
//info参数就是图片的热点信息
ChartUtilities.writeImageMap(pw, "map0", info, false);    
%>
<HTML>    
<HEAD>    
<META http-equiv=Content-Type content="text/html; charset=GBK">    
<TITLE>图书销量饼图</TITLE>    
</HEAD>    
<BODY>    
<div ALIGN="CENTER">    
<img src="servlet/DisplayChart?filename=<%=filename%>"    width="720" height="450" usemap="#map0">    
</div>