展示了一张基于程序员学历情况的数据集制作的饼状图，通过交互式热点提示，用户可以详细了解每项数据的具体数值。
带热点提示的饼状图(即鼠标放在图型上可以看到当前数据项)
<%@
page contentType="text/html;charset=UTF-8"
%>
<%@
page import="org.jfree.data.general.DefaultPieDataset"
%>
<%@
page import="org.jfree.chart.*"
%>
<%@
page import="org.jfree.chart.plot.*"
%>
<%@
page import="org.jfree.chart.servlet.ServletUtilities"
%>
<%@
page import="org.jfree.chart.labels.StandardPieToolTipGenerator"
%>
<%@
page import="org.jfree.chart.urls.StandardPieURLGenerator"
%>
<%@
page import="org.jfree.chart.entity.StandardEntityCollection"
%>
<%@
page import="java.io.*"
%>
<
html
>
<head
>
<meta http-equiv=Content-Type content="text/html; charset=UTF-8"
>
<title></title
>
</head
>
<body
>
<%
DefaultPieDataset data =
new
DefaultPieDataset();
data.setValue(
"高中以下"
, 370);
data.setValue(
"高中"
, 1530);
data.setValue(
"大专"
, 5700);
data.setValue(
"本科"
, 8280);
data.setValue(
"硕士"
, 4420);
data.setValue(
"博士"
, 80);
PiePlot3D plot =
new PiePlot3D(data);
//3D饼图
plot.setURLGenerator(
new StandardPieURLGenerator("barview.jsp"));
//设定链接
JFreeChart chart =
new JFreeChart(""
,
JFreeChart.DEFAULT_TITLE_FONT, plot,
true
);
chart.setBackgroundPaint(java.awt.Color.white);
//可选，设置图片背景色
chart.setTitle(
"程序员学历情况调查表");
//可选，设置图片标题
plot.setToolTipGenerator(
new
StandardPieToolTipGenerator());
StandardEntityCollection sec =
new
StandardEntityCollection();
ChartRenderingInfo info =
new
ChartRenderingInfo(sec);
PrintWriter w =
new PrintWriter(out);
//输出MAP信息
//500是图片长度，300是图片高度
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,
info, session);
ChartUtilities.writeImageMap(w,
"map0", info, false
);
String graphURL = request.getContextPath()
+
"/servlet/DisplayChart?filename="
+ filename;
%>
<p ALIGN="CENTER"
>
<img src="<%=graphURL%>" width=500 height=300 border=0 usemap="#map0"
>
</p
>
</body
>
</
html
>
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