JFreeChart 用法与示例

JFreeChart 用法与示例

1.创建JFreeChart步骤大致为以下三步：

（1）.创建数据集对象

 DefaultCategoryDataset dataSet = new DefaultCategoryDataset();

(2).创建JFreeChart对象

 // 通过ChartFactory创建JFreeChart
         JFreeChart chart = ChartFactory.createBarChart3D();
 或者         JFreeChart chart = new JFreeChart();

(3).创建呈现媒介，并将chart装入媒介

 ChartFrame cf = new ChartFrame();
 或者：
 String fileName = ServletUtilities.saveChartAsJPEG(ChartUtil.createChart(), 450, 300, session);
 String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;

2.1 示例1：

2.1.1 ChartUtil.java代码清单：

 package com.xqh.util.jfree;

 import java.awt.Font;

 import org.jfree.chart.ChartFactory;
 import org.jfree.chart.ChartFrame;
 import org.jfree.chart.JFreeChart;
 import org.jfree.chart.StandardChartTheme;
 import org.jfree.chart.plot.PlotOrientation;
 import org.jfree.data.category.CategoryDataset;
 import org.jfree.data.category.DefaultCategoryDataset;

 public class ChartUtil {
     /**
      * 创建数据集合
      * @return dataSet
      */
     public static CategoryDataset createDataSet() {
         // 实例化DefaultCategoryDataset对象
         DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
         // 向数据集合中添加数据
         dataSet.addValue(500, "Java图书", "J2SE类");
         dataSet.addValue(100, "Java图书", "J2ME类");
         dataSet.addValue(900, "Java图书", "J2EE类");
         return dataSet;
     }
     /**
      * 创建JFreeChart对象
      * @return chart
      */
     public static JFreeChart createChart() {
         StandardChartTheme standardChartTheme = new StandardChartTheme("CN"); //创建主题样式
         standardChartTheme.setExtraLargeFont(new Font("隶书", Font.BOLD, 20)); //设置标题字体
         standardChartTheme.setRegularFont(new Font("宋体", Font.PLAIN, 15)); //设置图例的字体
         standardChartTheme.setLargeFont(new Font("宋体", Font.PLAIN, 15)); //设置轴向的字体
         ChartFactory.setChartTheme(standardChartTheme);//设置主题样式
         // 通过ChartFactory创建JFreeChart
         JFreeChart chart = ChartFactory.createBarChart3D(
                 "Java图书销量统计", //图表标题
                 "Java图书", //横轴标题
                 "销量（本）",//纵轴标题
                 createDataSet(),//数据集合
                 PlotOrientation.VERTICAL, //图表方向
                 true,//是否显示图例标识
                 false,//是否显示tooltips
                 false);//是否支持超链接
         return chart;
     }
     // 本地测试
     public static void main(String[] args) {
         ChartFrame cf = new ChartFrame("Test", createChart());
         cf.pack();
         cf.setVisible(true);
     }
 }

2.1.2 index.jsp 代码清单：

 <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
 <%@ page import="org.jfree.chart.servlet.ServletUtilities,
                             com.xqh.util.jfree.ChartUtil" %>
 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>

 "-//W3C//DTD HTML 4.01 Transitional//EN">


     "<%=basePath%>">

     Java 图书销量统计
     "pragma" content="no-cache">
     "cache-control" content="no-cache">
     "expires" content="0">
     "keywords" content="keyword1,keyword2,keyword3">
     "description" content="This is my page">




     <%
         String fileName = ServletUtilities.saveChartAsJPEG(ChartUtil.createChart(), 450, 300, session);
         String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;
     %>
     "<%=graphURL %>" border="1"/>

2.1.3 web.xml 配置信息：

 xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <welcome-file-list>
     <welcome-file>index.jspwelcome-file>
   welcome-file-list>
   <servlet>
     <servlet-name>DisplayChartservlet-name>
     <servlet-class>org.jfree.chart.servlet.DisplayChartservlet-class>
   servlet>
   <servlet-mapping>
     <servlet-name>DisplayChartservlet-name>
     <url-pattern>/servlet/DisplayCharturl-pattern>
   servlet-mapping>
 web-app>

2.1.4 运行结果：

2.2 示例2：

在示例1的基础上，对制图对象、绘图区对象、坐标轴对象。图片渲染对象等属性进行设置，并添加一个子标题

2.2.1 ChartUtil.java程序清单：

 package com.xqh.util.jfree;

 import java.awt.Font;
 import java.awt.Image;
 import java.io.IOException;

 import javax.imageio.ImageIO;

 import org.jfree.chart.ChartFactory;
 import org.jfree.chart.ChartFrame;
 import org.jfree.chart.JFreeChart;
 import org.jfree.chart.StandardChartTheme;
 import org.jfree.chart.axis.CategoryAxis;
 import org.jfree.chart.axis.CategoryLabelPositions;
 import org.jfree.chart.axis.ValueAxis;
 import org.jfree.chart.plot.CategoryPlot;
 import org.jfree.chart.plot.PlotOrientation;
 import org.jfree.chart.renderer.category.BarRenderer3D;
 import org.jfree.chart.title.TextTitle;
 import org.jfree.data.category.CategoryDataset;
 import org.jfree.data.category.DefaultCategoryDataset;
 import org.jfree.ui.VerticalAlignment;

 public class ChartUtil {
     /**
      * 创建数据集合
      * @return dataSet
      */
     public static CategoryDataset createDataSet() {
         // 实例化DefaultCategoryDataset对象
         DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
         // 添加第一季度数据
         dataSet.addValue(6000, "第一季度", "J2SE类");
         dataSet.addValue(3000, "第一季度", "J2ME类");
         dataSet.addValue(12000, "第一季度", "J2EE类");
         // 添加第二季度数据
         dataSet.addValue(8000, "第二季度", "J2SE类");
         dataSet.addValue(4000, "第二季度", "J2ME类");
         dataSet.addValue(6000, "第二季度", "J2EE类");
         // 添加第三季度数据
         dataSet.addValue(5000, "第三季度", "J2SE类");
         dataSet.addValue(4000, "第三季度", "J2ME类");
         dataSet.addValue(8000, "第三季度", "J2EE类");
         // 添加第四季度数据
         dataSet.addValue(8000, "第四季度", "J2SE类");
         dataSet.addValue(2000, "第四季度", "J2ME类");
         dataSet.addValue(9000, "第四季度", "J2EE类");
         return dataSet;
     }
     /**
      * 创建JFreeChart对象
      * @return chart
      */
     public static JFreeChart createChart() {
         StandardChartTheme standardChartTheme = new StandardChartTheme("CN"); //创建主题样式
         standardChartTheme.setExtraLargeFont(new Font("隶书", Font.BOLD, 20)); //设置标题字体
         standardChartTheme.setRegularFont(new Font("宋体", Font.PLAIN, 15)); //设置图例的字体
         standardChartTheme.setLargeFont(new Font("宋体", Font.PLAIN, 15)); //设置轴向的字体
         ChartFactory.setChartTheme(standardChartTheme);//设置主题样式
         // 通过ChartFactory创建JFreeChart
         JFreeChart chart = ChartFactory.createBarChart3D(
                 "Java图书销量统计", //图表标题
                 "Java图书", //横轴标题
                 "销量（本）",//纵轴标题
                 createDataSet(),//数据集合
                 PlotOrientation.VERTICAL, //图表方向
                 true,//是否显示图例标识
                 false,//是否显示tooltips
                 false);//是否支持超链接
         // 背景图片
         Image image = null;
         try {
             // 创建背景图片
             image = ImageIO.read(ChartUtil.class.getResource("test.jpg"));
         } catch (IOException e){
             e.printStackTrace();
         }
         chart.getTitle().setFont(new Font("隶书", Font.BOLD, 25)); // 设置标题字体
         chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12)); // 设置图例类别字体
         chart.setBorderVisible(true); // 设置显示边框
         TextTitle subTitle = new TextTitle("2012年Java类图书全国销量统计（J2SE, J2ME, J2EE）");//实例化TextTitle对象
         subTitle.setVerticalAlignment(VerticalAlignment.BOTTOM); //设置居中显示
         chart.addSubtitle(subTitle);//添加子标题
         CategoryPlot plot = chart.getCategoryPlot(); // 获取绘图区对象
         plot.setForegroundAlpha(0.8F);//设置绘图区前景色透明度
         plot.setBackgroundAlpha(0.5F);//设置绘图区背景色透明度
         plot.setBackgroundImage(image);//设置绘图区背景图片
         CategoryAxis categoryAxis = plot.getDomainAxis();//获取坐标轴对象
         categoryAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));//设置坐标轴标题字体
         categoryAxis.setTickLabelFont(new Font("宋体", Font.PLAIN, 12));//设置坐标轴尺值字体
         categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);// 设置坐标轴标题旋转角度
         ValueAxis valueAxis = plot.getRangeAxis();// 设置数据轴对象
         valueAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
         BarRenderer3D renderer = new BarRenderer3D();
         renderer.setItemMargin(0.32); // 设置柱间的间距
         plot.setRenderer(renderer);// 设置图片渲染对象
         return chart;
     }
     // 本地测试
     public static void main(String[] args) {
         ChartFrame cf = new ChartFrame("Test", createChart());
         cf.pack();
         cf.setVisible(true);
     }
 }

2.2.2 index.jsp 程序清单：

 <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
 <%@ page import="org.jfree.chart.servlet.ServletUtilities,
                             com.xqh.util.jfree.ChartUtil" %>
 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>

 "-//W3C//DTD HTML 4.01 Transitional//EN">


     "<%=basePath%>">

     Java 图书销量统计
     "pragma" content="no-cache">
     "cache-control" content="no-cache">
     "expires" content="0">
     "keywords" content="keyword1,keyword2,keyword3">
     "description" content="This is my page">




     <%
         String fileName = ServletUtilities.saveChartAsJPEG(ChartUtil.createChart(), 450, 300, session);
         String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;
     %>
     "<%=graphURL %>" border="1"/>

2.2.3 web.xml 配置信息：

 xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <welcome-file-list>
     <welcome-file>index.jspwelcome-file>
   welcome-file-list>
   <servlet>
     <servlet-name>DisplayChartservlet-name>
     <servlet-class>org.jfree.chart.servlet.DisplayChartservlet-class>
   servlet>
   <servlet-mapping>
     <servlet-name>DisplayChartservlet-name>
     <url-pattern>/servlet/DisplayCharturl-pattern>
   servlet-mapping>
 web-app>

2.2.4运行结果：