JfreeChart例子

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本文介绍如何使用Java和JFreeChart库创建饼图，并展示了两种不同场景的应用实例：一种是展示公司组织架构，另一种是展示电信业务组织架构。文章通过具体代码详细解释了饼图的创建过程，包括数据集的定义、图表样式的配置等。

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PieCharts.java:

package test; import java.awt.Font; import javax.swing.JPanel; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PiePlot; import org.jfree.data.general.DefaultPieDataset; import org.jfree.data.general.PieDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class PieCharts extends ApplicationFrame { private static final long serialVersionUID = 1L; public PieCharts(String s) { super(s); setContentPane(createDemoPanel()); } // 生成显示图表的面板 public static JPanel createDemoPanel() { JFreeChart jfreechart = createChart(createDataset()); return new ChartPanel(jfreechart); } // 生成饼图数据集对象 public static PieDataset createDataset() { DefaultPieDataset defaultpiedataset = new DefaultPieDataset(); defaultpiedataset.setValue("管理人员", 10.02D); defaultpiedataset.setValue("市场人员", 20.23D); defaultpiedataset.setValue("开发人员", 60.02D); defaultpiedataset.setValue("OEM人员", 10.02D); defaultpiedataset.setValue("其他人员", 5.11D); return defaultpiedataset; } // 生成图表主对象JFreeChart public static JFreeChart createChart(PieDataset piedataset) { // 定义图表对象 JFreeChart jfreechart = ChartFactory.createPieChart( "CityInfoPort公司组织架构图", piedataset, true, true, false); // 获得图表显示对象 PiePlot pieplot = (PiePlot) jfreechart.getPlot(); // 设置图表标签字体 pieplot.setLabelFont(new Font("SansSerif", Font.BOLD, 12)); pieplot.setNoDataMessage("No data available"); pieplot.setCircular(true); pieplot.setLabelGap(0.01D);// 间距 return jfreechart; } public static void main(String[] args) { PieCharts fjc = new PieCharts("CityInfoPort公司组织架构图"); fjc.pack(); RefineryUtilities.centerFrameOnScreen(fjc); fjc.setVisible(true); } }

效果图：

ChartDemo.java:

package test; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.io.IOException; import java.io.PrintWriter; import java.text.DecimalFormat; import java.text.NumberFormat; import javax.servlet.http.HttpSession; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.labels.StandardPieSectionLabelGenerator; import org.jfree.chart.labels.StandardPieToolTipGenerator; import org.jfree.chart.plot.PiePlot3D; import org.jfree.chart.servlet.ServletUtilities; import org.jfree.chart.title.TextTitle; import org.jfree.chart.urls.StandardPieURLGenerator; import org.jfree.data.general.DefaultPieDataset; import org.jfree.data.general.PieDataset; import org.jfree.util.Rotation; public class ChartDemo { String chartTitle = "电信业务组织架构图"; public String getPieChart(HttpSession session, PrintWriter writer) { String fileName = null; // 生成饼图数据集对象 PieDataset piedataset = createDataset(); // 建立JFreeChart JFreeChart chart = createChart(piedataset); ChartRenderingInfo info = new ChartRenderingInfo( new StandardEntityCollection()); try { fileName = ServletUtilities.saveChartAsJPEG(chart, 500, 300, info, session);// 生成图片 // Write the image map to the PrintWriter ChartUtilities.writeImageMap(writer, fileName, info, false); } catch (IOException e) { e.printStackTrace(); } // writer.flush(); // 返回生成图片的文件名 return fileName; } // 生成饼图数据集对象 public PieDataset createDataset() { DefaultPieDataset pieDataset = new DefaultPieDataset(); /* 第一个参数为名称，第二个参数是double数 */ pieDataset.setValue("我的e家", 55.33); pieDataset.setValue("小灵通", 20.8); pieDataset.setValue("天翼", 10.9); pieDataset.setValue("商务领航", 10); pieDataset.setValue("互联星空", 10); return pieDataset; } // 生成图表主对象JFreeChart public JFreeChart createChart(PieDataset piedataset) { // 定义图表对象 // JFreeChart chart = ChartFactory.createPieChart(chartTitle, // piedataset, // true, true, false); JFreeChart chart = ChartFactory.createPieChart3D(chartTitle, piedataset, true, true, false); // 设置饼图下面的图例的字体样式 chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); // 设置饼图背景色 chart.setBackgroundPaint(Color.white); // 设置饼图标题属性 Font font = new Font("宋体", Font.PLAIN, 18); TextTitle textTitle = new TextTitle(chartTitle, font); chart.setTitle(textTitle); // 获取图形的画布 PiePlot3D pieplot = (PiePlot3D) chart.getPlot(); // 设定链接 ("link.jsp","section"));//section为参数，不填写则默认为category pieplot.setURLGenerator(new StandardPieURLGenerator("link.jsp", "section")); // 设定图片的背景透明度（0-1.0之间） pieplot.setBackgroundAlpha(0.8f); // 设定图片的前景透明度（0-1.0之间） pieplot.setForegroundAlpha(0.6f); // 设置方向为顺时针方向 pieplot.setDirection(Rotation.CLOCKWISE); // 指定 section 轮廓线的颜色 pieplot.setOutlinePaint(Color.BLUE); // 抽离第一个 section 出来？？？？？？？？怎么实现？ // 指定 section 轮廓线的厚度 pieplot.setOutlineStroke(new BasicStroke(2)); // 设置第一个 section 的开始位置，默认是12点钟方向 // pieplot.setStartAngle(0); // 设置图形背景色 pieplot.setBackgroundPaint(Color.white); // 设置图表标签字体 pieplot.setLabelFont(new Font("宋体", Font.PLAIN, 12)); // 没有数据的时候显示的内容 pieplot.setNoDataMessage("无数据显示"); // 指定显示的饼图上圆形(false)还椭圆形(true) pieplot.setCircular(false); // 间距 pieplot.setLabelGap(0.02D); pieplot.setToolTipGenerator(new StandardPieToolTipGenerator( "{0}: ({1}万, {2})", NumberFormat.getNumberInstance(), new DecimalFormat("0.00%"))); // // 显示百分比 // setLabelGenerator：设置饼图标签的百分比样式 // setLegendLabelGenerator：设置饼图下面的图例的百分比样式 // // 图片中显示百分比:默认方式 // pieplot.setLabelGenerator(new // StandardPieSectionLabelGenerator(StandardPieToolTipGenerator.DEFAULT_TOOLTIP_FORMAT)); // // 图片中显示百分比:自定义方式，{0} 表示选项， {1} 表示数值， {2} 表示所占比例 ,小数点后两位 pieplot.setLabelGenerator(new StandardPieSectionLabelGenerator( "{0}={1}万({2})", NumberFormat.getNumberInstance(), new DecimalFormat("0.00%"))); pieplot.setLegendLabelGenerator(new StandardPieSectionLabelGenerator( "{0}: ({1}万, {2})")); // // 图例显示百分比:自定义方式， {0} 表示选项， {1} 表示数值， {2} 表示所占比例 // pieplot.setLegendLabelGenerator(new StandardPieSectionLabelGenerator( // "{0}={1}({2})")); return chart; } }

index3.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <%@ page import="test.ChartDemo"%> <%@ page import="java.io.PrintWriter"%> <% ChartDemo xyChart = new ChartDemo(); String fileName = xyChart .getPieChart(session, new PrintWriter(out)); String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName; %> <html> <head> <title>JFreeChart使用例子</title> </head> <body> <img src="<%=graphURL%>" width=500 height=350 border=0 usemap="#<%= fileName %>"> </body> </html>

效果图:

饼图1

ChartDemo.java:

ChartServlet.java:

package test; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.jfree.chart.ChartRenderingInfo; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.servlet.ServletUtilities; import org.jfree.data.general.PieDataset; public class ChartServlet extends HttpServlet { public ChartServlet() { super(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String fileName = null; response.setContentType("text/html"); // response.setContentType("image/jpeg"); PrintWriter out = response.getWriter(); HttpSession session = request.getSession(); ChartDemo chartDemo = new ChartDemo(); fileName = chartDemo.getPieChart(session, out); // // 生成饼图数据集对象 // PieDataset piedataset = chartDemo.createDataset(); // // 建立JFreeChart // JFreeChart chart = chartDemo.createChart(piedataset); // // ChartRenderingInfo info = new ChartRenderingInfo( // new StandardEntityCollection()); // // fileName = ServletUtilities.saveChartAsJPEG(chart, 500, 300, info, // session);// 生成图片 //// ChartUtilities.writeChartAsJPEG(new FileOutputStream("D:// 项目状态分布.jpg"),100,chart,640,480,null); //// ChartUtilities.writeChartAsJPEG(response.getOutputStream(), chart, 500, 300); // // 用于把保存的图片文件以字节流的形式写入用户界面 // ChartUtilities.writeImageMap(out, fileName, info, false); String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName; request.setAttribute("fileName", fileName); request.setAttribute("graphURL", graphURL); request.getRequestDispatcher("/index.jsp").forward(request, response); // 关闭IO流 out.flush(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } public void init() throws ServletException { // Put your code here } }

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page import="java.io.PrintWriter"%> <html> <head> <title>JFreeChart使用例子</title> </head> <body> <img src="${graphURL}" mce_src="${graphURL}" width="650" height="380" border="0" usemap="#${fileName}"> </body> </html>

效果图:

饼图2