JFreeChart饼状图代码

WindySky 2009-01-14

展开全文

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.awt.*,java.text.SimpleDateFormat,javax.swing.JPanel,org.jfree.chart.ChartFactory,org.jfree.chart.ChartPanel,org.jfree.chart.JFreeChart,org.jfree.chart.axis.DateAxis,org.jfree.chart.plot.XYPlot,org.jfree.chart.renderer.xy.XYItemRenderer,org.jfree.chart.renderer.xy.XYLineAndShapeRenderer,org.jfree.data.time.*,org.jfree.data.time.TimeSeries,org.jfree.data.time.TimeSeriesCollection,org.jfree.data.xy.XYDataset"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset,org.jfree.data.general.PieDataset,org.jfree.chart.title.TextTitle,org.jfree.chart.plot.*,org.jfree.data.general.PieDataset" %>
<%@ page import="java.io.*,org.jfree.chart.ChartUtilities"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>我的实例</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<div align="center">
    饼状图的实例--作者:Jacky yang. <br><br><br>
<%
    String title = "空调2002年市场占有率";
//设定数据源
DefaultPieDataset piedata = new DefaultPieDataset();
//第一个参数为名称，第二个参数是double数
piedata.setValue("联想", 27.3);
piedata.setValue("长城", 12.2);
piedata.setValue("海尔", 5.5);
piedata.setValue("美的", 17.1);
piedata.setValue("松下", 9.0);
piedata.setValue("科龙", 14.0);
//创建JFreeChart，都使用ChartFactory来创建JFreeChart,很标准的工厂设计模式
JFreeChart chart =
ChartFactory.createPieChart(title, piedata, true, true, true);
//设定图片标题
chart.setTitle(new TextTitle(title, new Font("隶书", Font.ITALIC, 15)));
//chart.addSubtitle(new TextTitle("2002财年分析", new Font("隶书", Font.ITALIC, 12)));
//设定背景
chart.setBackgroundPaint(Color.white);
//chart.s
//饼图使用一个PiePlot
PiePlot pie = (PiePlot)chart.getPlot();
//pie.setSectionLabelType(PiePlot.NAME_AND_PERCENT_LABELS);
//pie.setSectionLabelType(PiePlot.NAME_AND_VALUE_LABELS);
//设定显示格式(名称加百分比或数值)
//pie.setPercentFormatString("#,###0.0#%");
//设定百分比显示格式
pie.setBackgroundPaint(Color.white);
//pie.setSectionLabelFont(new Font("黑体", Font.TRUETYPE_FONT, 12));
//设定背景透明度（0-1.0之间）
pie.setBackgroundAlpha(0.6f);
//设定前景透明度（0-1.0之间）
pie.setForegroundAlpha(0.90f);
//输出文件到指定目录
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
//try {
//可以保存文件为jpg或png格式。
//ChartUtilities.saveChartAsJPEG(new File(fileName), 100, chart, 600, 600);
//第一个参数为文件名
//第二个参数质量
//第三个参数为哪个chart创建图片
//第四个宽度
//第五个高度
//}
//catch (IOException exz) {
// System.out.print("....Cant't Create image File");
// out.println(exz.getMessage());
//}

%>
   <img src="<%=graphURL%>" border=0 usemap="#<%= filename %>">
</div>
</body>
</html>