jfreechart画pie,bar,time图

最新推荐文章于 2025-08-15 20:44:49 发布

原创最新推荐文章于 2025-08-15 20:44:49 发布 · 686 阅读

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文章标签：

#jfreechart #import #dataset #html #random #jsp

本文详细介绍使用JFreeChart库绘制三种常见图表的方法：饼状图、柱状图及时间序列图。通过具体实例展示了如何设置数据集、图表样式及输出格式等关键步骤。

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步骤如下;

1.lib中导入包jfreechart包(gnujaxp.jar,...jfreechart-1.0.9.jar...)我的空间有下载:http://d.download.youkuaiyun.com/down/364609/facepp

2.引入包12个
<%@ page import="org.jfree.chart.ChartFactory,java.io.*" %>
<%@ page import="org.jfree.chart.JFreeChart,org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.PlotOrientation"%>
<%@ page import="org.jfree.data.xy.XYDataset"%>
<%@ page import="org.jfree.data.category.DefaultCategoryDataset"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset"%>
<%@ page import="org.jfree.data.time.Day"%>
<%@ page import="org.jfree.data.time.Month"%>
<%@ page import="org.jfree.data.time.TimeSeries"%>
<%@ page import="org.jfree.data.time.TimeSeriesCollection"%>
3.

1)画pie图
<%
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("喜欢英语", 20);
//第一个参数为块的名称，第二个参数为块占的百分比
data.setValue("喜欢数学",80);
JFreeChart chart = ChartFactory.createPieChart("饼状图",data,true, true, false);
response.setContentType("image/png");
OutputStream out2 = response.getOutputStream();
ChartUtilities.writeChartAsPNG(out2, chart, 800, 600);
//设定图的大小
%>

2)画bar图
<%DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  dataset.addValue(10.0, "S1", "C1");
  //第一个参数为纵坐标值//第二个参数为色块的表示值的显示第三个参数为统计分类(横向的)
  dataset.addValue(4.0, "中国", "一月");
  dataset.addValue(15.0,"中国", "二月");
  dataset.addValue(14.0, "中国", "三月");
  dataset.addValue(-5.0, "英国", "一月");
  dataset.addValue(-7.0, "英国", "二月");
  JFreeChart chart = ChartFactory.createBarChart3D(                    / /有3D就是立体的,没有3D就是平面的bar图
  "条形图",//图的名称
  "Category",//横坐标名
  "Value",//纵坐标名
  dataset,//结果集
  PlotOrientation.VERTICAL,
  true,
  true,
  false);
               response.setContentType("image/png");
               OutputStream out2 = response.getOutputStream();
               ChartUtilities.writeChartAsPNG(out2, chart, 800, 600);
           %>

3)画time图(随机产生的?)
          <%
           TimeSeries series = new TimeSeries("Random Data");
  Day current = new Day(1, Month.JANUARY, 2001);
  for (int i = 0; i < 100; i++) {
  series.add(current, Math.random() * 100);
  current = (Day) current.next();
  }
  XYDataset data = new TimeSeriesCollection(series);
  JFreeChart chart = ChartFactory.createTimeSeriesChart(
  "时序图",
  "Date",//横坐标名
  "Rate",//纵坐标名
  data,
  true,
  true,
  false
  );
response.setContentType("image/png");
               OutputStream out2 = response.getOutputStream();
               ChartUtilities.writeChartAsPNG(out2, chart, 800, 600);
%>

附:pie.jsp源码

<%@ page language="java" import="java.util.*" contentType="text/html; charset=GB2312"%>
<%@ page import="org.jfree.chart.ChartFactory,java.io.*" %>
<%@ page import="org.jfree.chart.JFreeChart,org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.PlotOrientation"%>
<%@ page import="org.jfree.data.xy.XYDataset"%>
<%@ page import="org.jfree.data.category.DefaultCategoryDataset"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset"%>
<%@ page import="org.jfree.data.time.Day"%>
<%@ page import="org.jfree.data.time.Month"%>
<%@ page import="org.jfree.data.time.TimeSeries"%>
<%@ page import="org.jfree.data.time.TimeSeriesCollection"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>


    <title>My JSP 'pie.jsp' starting page</title>

</head>

<body>
<%
DefaultPieDataset data = new DefaultPieDataset();
data.setValue("喜欢英语", 20);
//第一个参数为块的名称，第二个参数为块占的百分比
data.setValue("喜欢数学",80);
JFreeChart chart = ChartFactory.createPieChart("饼状图",data,true, true, false);
response.setContentType("image/png");
OutputStream out2 = response.getOutputStream();
ChartUtilities.writeChartAsPNG(out2, chart, 800, 600);
//设定图的大小
%>
</body>
</html>