使用JFreeChart生成带交互功能的统计图例

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jfreechart Ajax 企业应用 Servlet JavaScript

a.jsp
代码：
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<%@ page language="java"
    import="org.jfree.chart.*,org.jfree.data.general.DefaultPieDataset,org.jfree.chart.plot.PiePlot3D,java.awt.Font,org.jfree.chart.JFreeChart,org.jfree.chart.title.TextTitle,org.jfree.chart.title.LegendTitle,org.jfree.chart.labels.StandardPieToolTipGenerator,org.jfree.chart.urls.StandardPieURLGenerator,org.jfree.chart.entity.StandardEntityCollection,java.io.PrintWriter,org.jfree.chart.servlet.ServletUtilities"
    pageEncoding="utf-8"%>
<%
    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>My JSP 'a.jsp' starting page</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>
    <%
           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("Ajax in Action", 25000);
           data.setValue("JavaScript权威指南", 29000);
           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)));
           LegendTitle legend = chart.getLegend(0);
           legend.setItemFont(new Font("宋体", Font.BOLD,18));

           plot.setToolTipGenerator(new StandardPieToolTipGenerator());
           plot.setURLGenerator(new StandardPieURLGenerator("jfreechart/b.jsp"));
           StandardEntityCollection entityCollection = new StandardEntityCollection();
           ChartRenderingInfo info = new ChartRenderingInfo(entityCollection);
           PrintWriter pw = new PrintWriter(out);
           String filename = ServletUtilities.saveChartAsPNG(chart, 720, 450,
                   info, null);
           ChartUtilities.writeImageMap(pw, "map0", info, false);
       %>
    <body>

       <img src="DisplayChart?filename=<%=filename%>" width="720"
           height="450" usemap="#map0" 　/>
    </body>
</html>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

b.jsp
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b.jsp
代码：
<%@ page language="java"
    import="org.jfree.chart.*,java.awt.Font,org.jfree.chart.JFreeChart,org.jfree.chart.title.TextTitle,org.jfree.chart.title.LegendTitle,org.jfree.chart.servlet.ServletUtilities,org.jfree.chart.plot.PlotOrientation,org.jfree.chart.plot.CategoryPlot,org.jfree.chart.axis.NumberAxis,org.jfree.chart.axis.CategoryAxis,org.jfree.chart.axis.CategoryLabelPositions,org.jfree.data.category.CategoryDataset,org.jfree.data.category.DefaultCategoryDataset"
    pageEncoding="UTF-8"%>

<%
    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>My JSP 'b.jsp' starting page</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>
       <%

           CategoryDataset dataset;
           String queryString = request.getQueryString();
           queryString = java.net.URLDecoder.decode(queryString, "UTF-8");
           String category = null;
           String[] queryStrings=queryString.split("&");
           for (int i = 0; i < queryStrings.length; i++) {
           String[] nameValue = queryStrings[i].split("=");
           category = nameValue[0].equals("category") ? nameValue[1]
           : category;
           }

           String subTitle = "";
           if (category.equals("Spring2.0宝典")
                   || category.equals("轻量级J2EE企业应用实战")
                   || category.equals("基于J2EE的Ajax宝典")) {
               dataset = leeGetDataSet();
               subTitle = "作者李刚的";
           } else {
               dataset = getDataSet();
               subTitle = "其它";
           }
           String title = subTitle + "图书的销售情况";
           JFreeChart chart = ChartFactory.createBarChart3D(title, "月份", "销量",
                   dataset, PlotOrientation.VERTICAL, true, false, false);
           chart.setTitle(new TextTitle(title, new Font("黑体", Font.ITALIC,
                   22)));
           LegendTitle legend = chart.getLegend(0);
           legend.setItemFont(new Font("宋体", Font.BOLD, 20));//设置图例的字体
           CategoryPlot plot = (CategoryPlot) chart.getPlot();

           CategoryAxis categoryAxis = plot.getDomainAxis();//取得横轴
           categoryAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));//设置横轴显示标签的字体
           categoryAxis
                   .setCategoryLabelPositions(CategoryLabelPositions.UP_45);//分类标签以４５度倾斜
           categoryAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 18));//分类标签字体

           NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();//取得纵轴
           numberAxis.setLabelFont(new Font("宋体", Font.BOLD, 22));

           String filename = ServletUtilities.saveChartAsPNG(chart, 650, 390,
                   null, session);
       %>

       <img src="DisplayChart?filename=<%=filename%>" width="720"
           height="450" border="0" 　/>

    </body>
    <%!private static CategoryDataset getDataSet() {
       DefaultCategoryDataset dataset = new DefaultCategoryDataset();
       dataset.addValue(47000, "Ajax in Action", "06年10月");
       dataset.addValue(38000, "Ajax in Action", "06年11月");
       dataset.addValue(31000, "Ajax in Action", "06年12月");
       dataset.addValue(25000, "Ajax in Action", "07年01月");
       dataset.addValue(45000, "Ajax in Action", "07年02月");
       dataset.addValue(28000, "Ajax in Action", "07年03月");
       dataset.addValue(42000, "JavaScript权威指南", "06年10月");
       dataset.addValue(31000, "JavaScript权威指南", "06年11月");
       dataset.addValue(41000, "JavaScript权威指南", "06年12月");
       dataset.addValue(35000, "JavaScript权威指南", "07年01月");
       dataset.addValue(25000, "JavaScript权威指南", "07年02月");
       dataset.addValue(18000, "JavaScript权威指南", "07年03月");
       return dataset;
    }

    private static CategoryDataset leeGetDataSet() {
       DefaultCategoryDataset dataset = new DefaultCategoryDataset();
       dataset.addValue(42000, "Spring2.0宝典", "06年10月");
       dataset.addValue(18000, "Spring2.0宝典", "06年11月");
       dataset.addValue(51000, "Spring2.0宝典", "06年12月");
       dataset.addValue(25000, "Spring2.0宝典", "07年01月");
       dataset.addValue(35000, "Spring2.0宝典", "07年02月");
       dataset.addValue(26000, "Spring2.0宝典", "07年03月");
       dataset.addValue(47000, "轻量级J2EE企业应用实战", "06年10月");
       dataset.addValue(38000, "轻量级J2EE企业应用实战", "06年11月");
       dataset.addValue(31000, "轻量级J2EE企业应用实战", "06年12月");
       dataset.addValue(25000, "轻量级J2EE企业应用实战", "07年01月");
       dataset.addValue(25000, "轻量级J2EE企业应用实战", "07年02月");
       dataset.addValue(25000, "轻量级J2EE企业应用实战", "07年03月");
       dataset.addValue(43000, "基于J2EE的Ajax宝典", "06年10月");
       dataset.addValue(28000, "基于J2EE的Ajax宝典", "06年11月");
       dataset.addValue(37000, "基于J2EE的Ajax宝典", "06年12月");
       dataset.addValue(20000, "基于J2EE的Ajax宝典", "07年01月");
       dataset.addValue(35000, "基于J2EE的Ajax宝典", "07年02月");
       dataset.addValue(15000, "基于J2EE的Ajax宝典", "07年03月");
       return dataset;
    }%>

</html>
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web.xml
代码：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <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>

</web-app>

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