jfreechart的三个例子

最新推荐文章于 2021-02-16 05:15:01 发布

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#jfreechart #import #string #dataset #stylesheet #html

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本文详细介绍如何使用Java和JFreeChart库绘制三种类型的图表：柱状图、饼状图及折线图。通过示例代码展示了如何配置数据集、设置图表样式及生成图片。

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第一步：导包

itext-2.0.1.jar,jcommon-1.0.9.jar,jfreechart-1.0.5-experimental.jar,jfreechart-1.0.5-swt.jar,jfreechart-1.0.5.jar,swtgraphics2d.jar

第二步：配置xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
    <servlet-name>DisplayChart</servlet-name>
    <servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

第三步：写代码

第一个例子：

                             <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="org.jfree.chart.ChartFactory,
    org.jfree.chart.JFreeChart,
    org.jfree.chart.plot.PlotOrientation,
    org.jfree.chart.servlet.ServletUtilities,
    org.jfree.data.category.DefaultCategoryDataset" %>

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


    <title>My JSP 'test1.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
   <%
     //产生一个数据集的收集器
      DefaultCategoryDataset dataset =
      new DefaultCategoryDataset();
      //收集数据
      dataset.setValue(300,"广州","橡胶");
      dataset.setValue(600,"襄樊","大头菜");
      dataset.setValue(500,"宜昌","柑橘");
      dataset.setValue(400,"黄石","铁矿石");
      dataset.setValue(300,"乌鲁木齐","哈密瓜");
      dataset.setValue(500,"海口","芒果");

      //设计图片的解决方案
      JFreeChart chart =
      ChartFactory.createStackedBarChart(
        "水果销售图", //图标的标题
        "水果名称",   //目标轴的显示标签
        "销售量",    //数值轴的标签
        dataset,    //数据集
        PlotOrientation.VERTICAL,//图标的方向：水平垂直
        true, //是否显示图例(对于简单的柱状图必须是false)
        false, //是否生成工具
        false //是否生成URL连接
      );

      //具体生成图片的设置
      String filename =
      ServletUtilities.saveChartAsJPEG(
           chart, //创建图形面板
           500, //设置图片大小
           300,
           null, //默认路径
           session
      );
     String URL = request.getContextPath()
     +"/servlet/DisplayChart?filename="+filename;

    %>
    <img src="<%=URL %>" width="500" height="300"
    border="0" usemap="#filename" />

</body>
</html>

第二个例子：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="org.jfree.chart.labels.StandardPieToolTipGenerator"%>
<%@ page import="org.jfree.chart.urls.StandardPieURLGenerator"%>
<%@ page import="org.jfree.chart.entity.StandardEntityCollection"%>
<%@ page import="java.io.*"%>

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

    <title>饼状图</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<%
  DefaultPieDataset data =
   new DefaultPieDataset();
   data.setValue("高中以下",300);
   data.setValue("高中",200);
   data.setValue("专科",400);
   data.setValue("本科",500);
   data.setValue("硕士",100);
   PiePlot3D plot =
    new PiePlot3D(data);//产生一个3D视图

   JFreeChart chart = new JFreeChart("",
   JFreeChart.DEFAULT_TITLE_FONT,//设置字体
   plot,//加入3D视图
   true //是否显示图例
   );
  //生成map图片，需要用ChartRenderingInfo
  ChartRenderingInfo info =
   new ChartRenderingInfo(
  new StandardEntityCollection());
  //StandardEntityCollection建立一个map标准的实例集
  String filename =
  ServletUtilities.saveChartAsPNG(
    chart,
    500,
    300,
    info,
    session
  );

  String URL = request.getContextPath()
     +"/servlet/DisplayChart?filename="+filename;
   %>
<img src="<%=URL %>" width="500" height="300"
    border="0" usemap="#filename" />


</body>
</html>

第三个例子：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import = "org.jfree.chart.ChartFactory"%>
<%@ page import = "org.jfree.chart.JFreeChart"%>
<%@ page import = "org.jfree.chart.plot.PlotOrientation"%>
<%@ page import = "org.jfree.data.category.DefaultCategoryDataset"%>
<%@ page import = "org.jfree.chart.axis.NumberAxis"%>
<%@ page import = "org.jfree.chart.block.BlockBorder"%>
<%@ page import = "org.jfree.chart.plot.CategoryPlot"%>
<%@ page import = "org.jfree.ui.RectangleEdge"%>

<%@ page import = "org.jfree.chart.renderer.category.LineAndShapeRenderer"%>
<%@ page import = "org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import = "org.jfree.chart.title.LegendTitle"%>
<%@ page import="sun.jdbc.odbc.ee.DataSource"%>

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


    <title>血压分布图</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<%
  String series1 = "First";
  String series2 = "Second";
  String series3 = "Third";

  //x轴的值
  String type1 = "Type 1";
  String type2 = "Type 2";
  String type3 = "Type 3";
  String type4 = "Type 4";
  String type5 = "Type 5";
  String type6 = "Type 6";
  String type7 = "Type 7";
  String type8 = "Type 8";

  DefaultCategoryDataset dataset =
   new DefaultCategoryDataset();
   dataset.addValue(1.0,series1,type1);
   dataset.addValue(2.0,series1,type2);
   dataset.addValue(3.0,series1,type3);
   dataset.addValue(4.0,series1,type4);
   dataset.addValue(5.0,series1,type5);
   dataset.addValue(6.0,series1,type6);
   dataset.addValue(7.0,series1,type7);
   dataset.addValue(8.0,series1,type8);

   dataset.addValue(4.0,series2,type1);
   dataset.addValue(2.0,series2,type2);
   dataset.addValue(3.0,series2,type3);
   dataset.addValue(6.0,series2,type4);
   dataset.addValue(4.0,series2,type5);
   dataset.addValue(1.0,series2,type6);
   dataset.addValue(8.0,series2,type7);
   dataset.addValue(7.0,series2,type8);

   dataset.addValue(5.0,series3,type1);
   dataset.addValue(1.0,series3,type2);
   dataset.addValue(3.0,series3,type3);
   dataset.addValue(6.0,series3,type4);
   dataset.addValue(5.0,series3,type5);
   dataset.addValue(8.0,series3,type6);
   dataset.addValue(2.0,series3,type7);
   dataset.addValue(3.0,series3,type8);

  JFreeChart chart =
   ChartFactory.createLineChart(
   "血压分布图",
   "type",
   "value",
   dataset,
   PlotOrientation.VERTICAL,
   true,
   false,
   false
   );
  LegendTitle legend =
   chart.getLegend();//图例显示的位置
   legend.setPosition
   (RectangleEdge.BOTTOM);//底部
   legend.setBorder(BlockBorder.NONE);// 没有

  CategoryPlot plot =
  chart.getCategoryPlot();//设置对图片的精细操作

  NumberAxis rangAxis =
  (NumberAxis)plot.getRangeAxis();//获得一个对y轴操作的实例
  //用整型标记
  rangAxis.setStandardTickUnits(
  NumberAxis.createIntegerTickUnits());
  //从0开始计数
  rangAxis.setAutoRangeIncludesZero(true);
  String filename = ServletUtilities.
  saveChartAsPNG(chart,700,500,null,session);
   String URL = request.getContextPath()
     +"/servlet/DisplayChart?filename="+filename;
   %>
<img src="<%=URL %>" width="700" height="500"
    border="0" usemap="#filename" />


</body>
</html>