一、首先需要jfreechart的包：jfreechart-1.0.15.jar、jfreechart-1.0.15-experimental.jar、jfreechart-1.0.15-swt.jar、jcommon-1.0.18.jar
搜索“jfreechart-1.0.15.zip下載”，解壓後在lib文件夾裏可以找到
二、配置站點的web.xml文件，增加以下節點：
<servlet-name>DisplayChart</servlet-name>
<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/DisplayChart</url-pattern>
</servlet-mapping>
三、JSP文件代碼：
bing1.jsp 一個基本的餅圖
<%@ page contentType="text/html;charset=GBK"%>
<%@ page
import="org.jfree.chart.*,org.jfree.chart.plot.PiePlot,
org.jfree.data.general.DefaultPieDataset,
org.jfree.chart.servlet.ServletUtilities,
java.awt.*,org.jfree.chart.title.TextTitle"%>
<%
//設置數據集
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("初中高級程序員", 0.55);
dataset.setValue("項目經理", 0.1);
dataset.setValue("系統分析師", 0.1);
dataset.setValue("軟件架構師", 0.1);
dataset.setValue("其他", 0.2);
//通過工廠類生成JFreeChart對象
JFreeChart chart = ChartFactory.createPieChart3D("IT行業職業分佈圖",
dataset, true, false, false);
PiePlot pieplot = (PiePlot) chart.getPlot();
//沒有數據的時候顯示的內容
pieplot.setNoDataMessage("無數據顯示");
pieplot.setCircular(false);
pieplot.setLabelGap(0.02D);
//標題文字亂碼
TextTitle textTitle = chart.getTitle();
textTitle.setFont(new Font("宋體", Font.PLAIN, 20));
//餅上的文字亂碼
PiePlot plot = (PiePlot) chart.getPlot();
plot.setLabelFont(new Font("宋體", Font.BOLD, 20));
//圖例文字亂碼
chart.getLegend().setItemFont(new Font("宋體", Font.PLAIN, 12));
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,
null, session);
String graphURL = request.getContextPath()
+ "/DisplayChart?filename=" + filename;
%>
<html>
<head>
<title>餅狀圖1(基本的餅圖)</title>
</head>
<body>
<img src="<%=graphURL%>" width=500 height=300 border=0
usemap="#<%= filename %>">
</body>
</html>
bing2.jsp 一個顯示百分比的餅圖
<%@ page contentType="text/html;charset=GBK"%>
<%@ page
import="org.jfree.chart.*,org.jfree.chart.plot.PiePlot,
org.jfree.data.general.DefaultPieDataset,
org.jfree.chart.servlet.ServletUtilities,
java.awt.*,org.jfree.chart.title.TextTitle"%>
<%@ page
import="org.jfree.chart.labels.StandardPieSectionLabelGenerator"%>
<%@ page import="java.text.NumberFormat"%>
<%@page import="java.text.DecimalFormat"%>
<%
//設置數據集
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("初中高級程序員", 0.52);
dataset.setValue("項目經理", 0.1);
dataset.setValue("系統分析師", 0.1);
dataset.setValue("軟件架構師", 0.1);
dataset.setValue("其他", 0.18);
//通過工廠類生成JFreeChart對象
JFreeChart chart = ChartFactory.createPieChart3D("IT行業職業分佈圖",
dataset, true, false, false);
PiePlot pieplot = (PiePlot) chart.getPlot();
//一塊突出的餅圖，在網上搜了好久也沒找到可行的實現方式，歡迎大俠指導 <?後期如果找到解決方法再來做修改?>
//pieplot.setExplodePercent("A",0.3D);//炸開的餅圖，目前實現還有問題
//DecimalFormat:
//NumberFormat:
//StandardPieSectionLabelGenerator:
//setLabelGenerator():
DecimalFormat df = new DecimalFormat("0.00%");//獲得一個DecimalFormat對象，主要是設置小數問題
NumberFormat nf = NumberFormat.getNumberInstance();//獲得一個NumberFormat對象
StandardPieSectionLabelGenerator sp = new StandardPieSectionLabelGenerator(
"{0}{2}", nf, df);//獲得StandardPieSectionLabelGenerator對象
pieplot.setLabelGenerator(sp);//設置餅圖顯示百分比
//沒有數據的時候顯示的內容
pieplot.setNoDataMessage("無數據顯示");
pieplot.setCircular(false);
pieplot.setLabelGap(0.02D);
pieplot.setIgnoreNullValues(true);//設置不顯示空值
pieplot.setIgnoreZeroValues(true);//設置不顯示負值
//標題文字亂碼 IT行業職業分佈圖
TextTitle textTitle = chart.getTitle();
textTitle.setFont(new Font("宋體", Font.PLAIN, 20));
//餅上的文字亂碼
PiePlot plot = (PiePlot) chart.getPlot();
plot.setLabelFont(new Font("宋體", Font.PLAIN, 20));
//圖例文字亂碼 餅圖下面的5個說明
chart.getLegend().setItemFont(new Font("宋體", Font.PLAIN, 20));
String filename = ServletUtilities.saveChartAsPNG(chart, 1000, 600,
null, session);
String graphURL = request.getContextPath()
+ "/DisplayChart?filename=" + filename;
%>
<html>
<head>
<title>餅狀圖2(加上百分比並突出顯示某塊)</title>
</head>
<body>
<img src="<%=graphURL%>" width=1000 height=600 border=0
usemap="#<%= filename %>">
</body>
</html>
bing2.jsp 一個水晶效果的拼圖
<%@ 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"%>
<%@ page
import="org.jfree.chart.labels.StandardPieSectionLabelGenerator"%>
<%@ page import="java.text.NumberFormat"%>
<%@page import="java.text.DecimalFormat"%>
<%
//設置數據集
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("初中高級程序員", 0.52);
dataset.setValue("項目經理", 0.1);
dataset.setValue("系統分析師", 0.1);
dataset.setValue("軟件架構師", 0.1);
dataset.setValue("其他", 0.18);
//通過工廠類生成JFreeChart對象
JFreeChart chart = ChartFactory.createPieChart3D("IT行業職業分佈圖",
dataset, true, true, false);
//獲得3D的水晶圖對象
PiePlot3D pieplot3d = (PiePlot3D) chart.getPlot();
PiePlot pieplot = (PiePlot) chart.getPlot();
DecimalFormat df = new DecimalFormat("0.00%");//獲得一個DecimalFormat對象，主要是設置小數問題
NumberFormat nf = NumberFormat.getNumberInstance();//獲得一個NumberFormat對象
StandardPieSectionLabelGenerator sp = new StandardPieSectionLabelGenerator(
"{0}{2}", nf, df);//獲得StandardPieSectionLabelGenerator對象
pieplot.setLabelGenerator(sp);//設置餅圖顯示百分比
//設置開始角度
pieplot3d.setStartAngle(150D);
//設置方向爲“順時針方向”
pieplot3d.setDirection(Rotation.CLOCKWISE);
//設置透明度，0.5F爲半透明，1爲不透明，0爲全透明
pieplot3d.setForegroundAlpha(0.5F);
//沒有數據的時候顯示的內容
pieplot3d.setNoDataMessage("無數據顯示");
//標題文字亂碼 IT行業職業分佈圖
TextTitle textTitle = chart.getTitle();
textTitle.setFont(new Font("宋體", Font.PLAIN, 20));
//餅上的文字亂碼
PiePlot plot = (PiePlot) chart.getPlot();
plot.setLabelFont(new Font("宋體", Font.PLAIN, 20));
//圖例文字亂碼 餅圖下面的5個說明
chart.getLegend().setItemFont(new Font("宋體", Font.PLAIN, 20));
String filename = ServletUtilities.saveChartAsPNG(chart, 1000, 600,
null, session);
String graphURL = request.getContextPath()
+ "/DisplayChart?filename=" + filename;
%>
<html>
<head>
<title>餅狀圖3(水晶餅圖)</title>
</head>
<body>
<img src="<%=graphURL%>" width=1000 height=600 border=0
usemap="#<%= filename %>">
</body>
</html>