项目结构：

       JFreeChart是一组功能强大、灵活易用的Java绘图API，使用它可以生成多种通用性的报表，

包括柱状图、饼图、曲线图、甘特图等。它能够用在Swing和Web等中制作自定义的图表或报表，

并且得到广泛的应用。本文将通过引领读者学习在JFreeChart中饼图、柱状图和曲线图的进阶

应用，来达到熟练使用JFreeChart的目的。

下载JFreeChart：

JFreeChart是开放源代码的免费软件，但是它的支持文档需要付费才能得到。

其下载地址为：

说明：1）source目录：为jfreechart的源码目录；

        2）lib目录：为包目录，我们需要关注的包为jfreechart-1.0.6.jar、gnujaxp.jar和jcommon-1.0.10.jar这三个包；

        3）根目录下的jfreechart-1.0.6-demo.jar是例子程序，大家双击后可看到其中有很多例子的运行结果。

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    接下来就进入开发阶段了

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/jsp_response_bufferedImage/WebRoot/WEB-INF/web.xml

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        DisplayChart
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        org.jfree.chart.servlet.DisplayChart
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        DisplayChart
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        /DisplayChart
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      15 16 17     
      
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        index.jsp
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/jsp_response_bufferedImage/WebRoot/index.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
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/jsp_response_bufferedImage/WebRoot/simple.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ page import="org.jfree.chart.ChartFactory" %> 3 <%@ page import="org.jfree.chart.JFreeChart" %> 4 <%@ page import="org.jfree.chart.plot.PlotOrientation" %> 5 <%@ page import="org.jfree.chart.servlet.ServletUtilities" %> 6 <%@ page import="org.jfree.data.category.DefaultCategoryDataset" %> 7 <% 8 String path = request.getContextPath(); 9 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";10 %>11 12 <%13     DefaultCategoryDataset dataset = new DefaultCategoryDataset();14     dataset.addValue(610, "Guangzhou", "pork");15     dataset.addValue(220, "Guangzhou", "beaf");16     dataset.addValue(530, "Guangzhou", "chicken");17     dataset.addValue(340, "Guangzhou", "fish");18     JFreeChart chart = ChartFactory.createBarChart3D("Meat sales statistics figure", "meat",19             "Sales Volume", dataset, PlotOrientation.VERTICAL, false, false,20             false);21     String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,22             null, session);23     String graphURL = request.getContextPath()24             + "/DisplayChart?filename=" + filename;25     out.println(filename);26     out.println("------------------");27     out.println(graphURL);    28 %>29 30 31   32     33     34     35     
     36     
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在浏览器地址栏输入《我服务器的端口号是1000》：

运行效果：

/jsp_response_bufferedImage/WebRoot/simple2.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ page 3     import="org.jfree.chart.ChartFactory,org.jfree.chart.JFreeChart,org.jfree.chart.plot.PlotOrientation,org.jfree.chart.servlet.ServletUtilities,org.jfree.data.category.CategoryDataset,org.jfree.data.general.DatasetUtilities"%> 4  5 <% 6     String path = request.getContextPath(); 7     String basePath = request.getScheme() + "://" 8             + request.getServerName() + ":" + request.getServerPort() 9             + path + "/";10 %>11 12 <%13     double[][] data = new double[][] { { 1310 }, { 720 }, { 1130 },14             { 440 } };15     String[] rowKeys = { "pork", "beaf", "chicken", "fish" };16     String[] columnKeys = { "" };17     CategoryDataset dataset = DatasetUtilities.createCategoryDataset(18             rowKeys, columnKeys, data);19     JFreeChart chart = ChartFactory20             .createBarChart3D("Guangzhou meat sales statistics figure", "meat", "Sales Volume", dataset,21                     PlotOrientation.VERTICAL, true, false, false);22 23     String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,24             null, session);25     String graphURL = request.getContextPath()26             + "/DisplayChart?filename=" + filename;27 %>28 29 30 31     32         33 34         35         
     36         
     37         
     38         
     39         
     40     41 42     43         45     46 

在浏览器地址栏输入《我服务器的端口号是1000》：

运行效果：

/jsp_response_bufferedImage/WebRoot/simple3.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ page 3     import="org.jfree.chart.ChartFactory,org.jfree.chart.JFreeChart,org.jfree.chart.plot.PlotOrientation,org.jfree.chart.servlet.ServletUtilities,org.jfree.data.category.CategoryDataset,org.jfree.data.general.DatasetUtilities,org.jfree.chart.plot.*,org.jfree.chart.labels.*,org.jfree.chart.renderer.category.BarRenderer3D,java.awt.*,org.jfree.ui.*,org.jfree.chart.axis.AxisLocation"%> 4  5 <% 6     String path = request.getContextPath(); 7     String basePath = request.getScheme() + "://" 8             + request.getServerName() + ":" + request.getServerPort() 9             + path + "/";10 %>11 12 <%13     double[][] data = new double[][] { { 1310, 1220, 1110, 1000 },14             { 720, 700, 680, 640 }, { 1130, 1020, 980, 800 },15             { 440, 400, 360, 300 } };16 String[] rowKeys = { "pork", "beaf", "chicken", "fish" };17     String[] columnKeys = { "Guangzhou", "Shenzhen", "Dongguan", "Foshan" };18     CategoryDataset dataset = DatasetUtilities.createCategoryDataset(19             rowKeys, columnKeys, data);20 21     JFreeChart chart = ChartFactory.createBarChart3D("Meat sales statistics figure", "meat",22             "Sales Volume", dataset, PlotOrientation.VERTICAL, true, true, false);23 24     CategoryPlot plot = chart.getCategoryPlot();25     //设置网格背景颜色26     plot.setBackgroundPaint(Color.white);27     //设置网格竖线颜色28     plot.setDomainGridlinePaint(Color.pink);29     //设置网格横线颜色30     plot.setRangeGridlinePaint(Color.pink);31     //显示每个柱的数值，并修改该数值的字体属性32 33     BarRenderer3D renderer = new BarRenderer3D();34     renderer35             .setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());36     renderer.setBaseItemLabelsVisible(true);37     //默认的数字显示在柱子中，通过如下两句可调整数字的显示38     //注意：此句很关键，若无此句，那数字的显示会被覆盖，给人数字没有显示出来的问题39     renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(40             ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));41     renderer.setItemLabelAnchorOffset(10D);42     //设置每个地区所包含的平行柱的之间距离43     //renderer.setItemMargin(0.3);44     plot.setRenderer(renderer);45     //设置地区、销量的显示位置46     //将下方的“肉类”放到上方47     plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);48     //将默认放在左边的“销量”放到右方49     plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);50 51     String filename = ServletUtilities.saveChartAsPNG(chart, 700, 400,52             null, session);53     String graphURL = request.getContextPath()54             + "/DisplayChart?filename=" + filename;55 %>56 57 58 59 60 61     62         63 64         65         
     66         
     67         
     68         
     69         
     70     71 72     73         75     76 

在浏览器地址栏输入《我服务器的端口号是1000》：

运行效果：

/jsp_response_bufferedImage/WebRoot/simple4.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ page 3     import="org.jfree.chart.*,org.jfree.chart.plot.PiePlot,org.jfree.data.general.DefaultPieDataset,org.jfree.chart.servlet.ServletUtilities,java.awt.*"%> 4  5 <% 6     String path = request.getContextPath(); 7     String basePath = request.getScheme() + "://" 8             + request.getServerName() + ":" + request.getServerPort() 9             + path + "/";10 %>11 12 <%13     //设置数据集14     DefaultPieDataset dataset = new DefaultPieDataset();15     dataset.setValue("Junior high school senior programmer", 0.55);16     dataset.setValue("Project Manager", 0.1);17     dataset.setValue("System analyst", 0.1);18     dataset.setValue("System analyst", 0.1);19     dataset.setValue("Other", 0.2);20 21     //通过工厂类生成JFreeChart对象22     //通过工厂类生成JFreeChart对象23     JFreeChart chart = ChartFactory.createPieChart3D("The IT industry professional distribution",24             dataset, true, false, false);25     PiePlot pieplot = (PiePlot) chart.getPlot();26     pieplot.setLabelFont(new Font("宋体", 0, 12));27     //没有数据的时候显示的内容28     pieplot.setNoDataMessage("No data to show");29     pieplot.setCircular(false);30 31     pieplot.setLabelGap(0.02D);32 33     String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,34             null, session);35     String graphURL = request.getContextPath()36             + "/DisplayChart?filename=" + filename;37 %>38 39 40 41 42 43 44     45         46 47         48         
     49         
     50         
     51         
     52         
     53     54 55     56         58     59 

在浏览器地址栏输入《我服务器的端口号是1000》：

运行效果：

/jsp_response_bufferedImage/WebRoot/simple5.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@ page 3     import="org.jfree.chart.ChartFactory,org.jfree.chart.JFreeChart,org.jfree.chart.servlet.ServletUtilities,org.jfree.chart.title.TextTitle,org.jfree.data.time.TimeSeries,org.jfree.data.time.Month,org.jfree.data.time.TimeSeriesCollection,java.awt.Font"%> 4  5 <% 6     String path = request.getContextPath(); 7     String basePath = request.getScheme() + "://" 8             + request.getServerName() + ":" + request.getServerPort() 9             + path + "/";10 %>11 12 <%13     //访问量统计时间线14     TimeSeries timeSeries = new TimeSeries("Hongten 's blog traffic statistics", Month.class);15     //时间曲线数据集合16     TimeSeriesCollection lineDataset = new TimeSeriesCollection();17     //构造数据集合18     timeSeries.add(new Month(1, 2007), 11200);19     timeSeries.add(new Month(2, 2007), 9000);20     timeSeries.add(new Month(3, 2007), 6200);21     timeSeries.add(new Month(4, 2007), 8200);22     timeSeries.add(new Month(5, 2007), 8200);23     timeSeries.add(new Month(6, 2007), 12200);24     timeSeries.add(new Month(7, 2007), 13200);25     timeSeries.add(new Month(8, 2007), 8300);26     timeSeries.add(new Month(9, 2007), 12400);27     timeSeries.add(new Month(10, 2007), 12500);28     timeSeries.add(new Month(11, 2007), 13600);29     timeSeries.add(new Month(12, 2007), 12500);30 31     lineDataset.addSeries(timeSeries);32     JFreeChart chart = ChartFactory.createTimeSeriesChart(33             "Traffic statistical time line", "Months", "Vistor Volume",34             lineDataset, true, true, true);35     //设置子标题36     TextTitle subtitle = new TextTitle("2007 year", new Font("黑体",37             Font.BOLD, 12));38     chart.addSubtitle(subtitle);39     //设置主标题40     chart.setTitle(new TextTitle("Hongten 's blog traffic statistics",41             new Font("隶书", Font.ITALIC, 15)));42     chart.setAntiAlias(true);43     String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,44             null, session);45     String graphURL = request.getContextPath()46             + "/DisplayChart?filename=" + filename;47 %>48 49 50 51     52         53 54         55         
     56         
     57         
     58         
     59         
     60     61 62     63         65     66 

在浏览器地址栏输入《我服务器的端口号是1000》：

运行效果：