使用JFreeChart生成带交互功能的统计图例　-优快云博客

本文介绍了一个使用JFreeChart库创建的图书销量统计图，通过饼图展示不同书籍的总销量，并提供点击图书名称查看该图书各月份销量详情的功能。

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a.jsp
代码：

<%@ 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">
        <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

    </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
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">
        <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

    </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>

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>