JFreeChart 制作3D饼状图分析数据

骑猪看日落 2022-06-12 03:13 171阅读 0赞

代码：

CharUtil.java

package com.chart;
    
    import java.awt.Font;
    import java.text.NumberFormat;
    
    import org.jfree.chart.ChartFactory;
    import org.jfree.chart.JFreeChart;
    import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
    import org.jfree.chart.plot.PiePlot;
    import org.jfree.data.general.DefaultPieDataset;
    import org.jfree.data.general.PieDataset;
    
    public class CharUtil {
      public static PieDataset initDataSet(){
    	   double []values = {300,110,160,240,220,50};
    	   String []keys ={"数码产品","家用电器","日常用品","服装","水果蔬菜","其他"};
    	   DefaultPieDataset dataset = new DefaultPieDataset();
    	   for (int i = 0; i < values.length; i++) {
    	     dataset.setValue(keys[i], values[i]);
    	   }
    	   System.out.println("数据集："+dataset);
    	   return dataset;
       }
      
      public static JFreeChart createChart(){
    	  //创建3D饼图
    	  JFreeChart chart = ChartFactory.createPieChart3D("海哥商城月销量统计", initDataSet(), true, true, false);
    	  chart.getTitle().setFont(new Font("隶书", Font.BOLD, 15));  //设置标题字体
    	  PiePlot plot = (PiePlot) chart.getPlot();
    	  plot.setForegroundAlpha(0.5f);  //设置前景透明度
    	  plot.setLabelFont(new Font("宋体", Font.PLAIN, 12));
    	  plot.setCircular(true);
    	  //设置分类标签的格式
    	  plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}={2}", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()));
    	  return chart;
      }
    }

ChartUtil.jsp

<%@page import="com.chart.CharUtil"%>
    <%@page import="org.jfree.chart.servlet.ServletUtilities"%>
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JFreeChart显示饼状图</title>
    </head>
    <body>
    <% 
      String fileName = ServletUtilities.saveChartAsJPEG(CharUtil.createChart(), 550, 380, session);
      //String graphURL = request.getContextPath()+"/DisplayChart?fileName="+fileName;
    %>
    <div align="center">
       <img alt="商城月销量统计" src="DisplayChart?filename=<%=fileName %>" border="1">
    </div>
    </body>
    </html>

截图：

![Center][]

[Center]: /images/20220612/263cf3b491d848179d60d31e3135137d.png