java实现各种数据统计图(柱形图,饼图,折线图)
最近在做数据挖掘的课程设计,需要将数据分析的结果很直观的展现给用户,这就要用到数据统计图,要实现这个功能就需要几个第三方包了:
1. jfreechart-1.0.13.jar
2. jcommon-1.0.16.jar
3. gnujaxp.jar
先来看一下,最终效果图:
主要是jfreechart-1.0.13.jar,但这三个包要齐全,我已经将所有与jfreechart有关的jar包与本文实例的工程(代码)一同压缩上传了,有兴趣的同学可以下载,
下载地址:http://download.csdn.net/detail/pzhtpf/4327700
接下来,我们一步步来实现本程序。
一,前期准备工作,也就把这三个第三方包添加进本文工程,添加过程特别简单,前面写过一篇博客,讲的是java如何读取Excel表格中的数据(有兴趣的同学可以看一看:http://blog.csdn.net/pzhtpf/article/details/7506135),也要添加第三方包,添加过程一模一样,这里我们在复习一遍:
1,建,立java项目,在这个项目在建立一个新的文件夹lib;
2,将上述三个jar包,复制到lib
3,然后右键点击这个java项目,选择Properties
4,在左侧列表里选中Java Build Path,右侧选中Libraries
5,点击Add JARs
6,然后去选择这个项目中lib文件夹中的三个jar,点击确定
成功后,项目中会多一个文件夹为:Referenced Libraries
二, 实现柱形图的java代码:
- import java.awt.Font;
- import org.jfree.chart.ChartFactory;
- import org.jfree.chart.ChartPanel;
- import org.jfree.chart.JFreeChart;
- import org.jfree.chart.axis.CategoryAxis;
- import org.jfree.chart.axis.ValueAxis;
- import org.jfree.chart.plot.CategoryPlot;
- import org.jfree.chart.plot.PlotOrientation;
- import org.jfree.data.category.CategoryDataset;
- import org.jfree.data.category.DefaultCategoryDataset;
- public class BarChart {
- ChartPanel frame1;
- public BarChart(){
- CategoryDataset dataset = getDataSet();
- JFreeChart chart = ChartFactory.createBarChart3D(
- "水果", // 图表标题
- "水果种类", // 目录轴的显示标签
- "数量", // 数值轴的显示标签
- dataset, // 数据集
- PlotOrientation.VERTICAL, // 图表方向: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链接
- );
- //从这里开始
- CategoryPlot plot=chart.getCategoryPlot();//获取图表区域对象
- CategoryAxis domainAxis=plot.getDomainAxis(); //水平底部列表
- domainAxis.setLabelFont(new Font("黑体",Font.BOLD,14)); //水平底部标题
- domainAxis.setTickLabelFont(new Font("宋体",Font.BOLD,12)); //垂直标题
- ValueAxis rangeAxis=plot.getRangeAxis();//获取柱状
- rangeAxis.setLabelFont(new Font("黑体",Font.BOLD,15));
- chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
- chart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
- //到这里结束,虽然代码有点多,但只为一个目的,解决汉字乱码问题
- frame1=new ChartPanel(chart,true); //这里也可以用chartFrame,可以直接生成一个独立的Frame
- }
- private static CategoryDataset getDataSet() {
- DefaultCategoryDataset dataset = new DefaultCategoryDataset();
- dataset.addValue(100, "北京", "苹果");
- dataset.addValue(100, "上海", "苹果");
- dataset.addValue(100, "广州", "苹果");
- dataset.addValue(200, "北京", "梨子");
- dataset.addValue(200, "上海", "梨子");
- dataset.addValue(200, "广州", "梨子");
- dataset.addValue(300, "北京", "葡萄");
- dataset.addValue(300, "上海", "葡萄");
- dataset.addValue(300, "广州", "葡萄");
- dataset.addValue(400, "北京", "香蕉");
- dataset.addValue(400, "上海", "香蕉");
- dataset.addValue(400, "广州", "香蕉");
- dataset.addValue(500, "北京", "荔枝");
- dataset.addValue(500, "上海", "荔枝");
- dataset.addValue(500, "广州", "荔枝");
- return dataset;
- }
- public ChartPanel getChartPanel(){
- return frame1;
- }
- }
效果图如下:
但我们把private static CategoryDataset getDataSet(){}方法中的数据变化一下后,又会形成另一种效果,比如说我们改成:
- private static CategoryDataset getDataSet() {
- DefaultCategoryDataset dataset = new DefaultCategoryDataset();
- dataset.addValue(100, "苹果", "苹果");
- dataset.addValue(200, "梨子", "梨子");
- dataset.addValue(300, "葡萄", "葡萄");
- dataset.addValue(400, "香蕉", "香蕉");
- dataset.addValue(500, "荔枝", "荔枝");
- return dataset;
- }
效果图如下:
三, 实现饼状图的java代码:
- package com.njue.testJFreeChart;
- import java.awt.Font;
- import java.text.DecimalFormat;
- import java.text.NumberFormat;
- import javax.swing.JPanel;
- import org.jfree.chart.ChartFactory;
- import org.jfree.chart.ChartPanel;
- import org.jfree.chart.JFreeChart;
- import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
- import org.jfree.chart.plot.PiePlot;
- import org.jfree.data.general.DefaultPieDataset;
- public class PieChart {
- ChartPanel frame1;
- public PieChart(){
- DefaultPieDataset data = getDataSet();
- JFreeChart chart = ChartFactory.createPieChart3D("水果产量",data,true,false,false);
- //设置百分比
- PiePlot pieplot = (PiePlot) chart.getPlot();
- DecimalFormat df = new DecimalFormat("0.00%");//获得一个DecimalFormat对象,主要是设置小数问题
- NumberFormat nf = NumberFormat.getNumberInstance();//获得一个NumberFormat对象
- StandardPieSectionLabelGenerator sp1 = new StandardPieSectionLabelGenerator("{0} {2}", nf, df);//获得StandardPieSectionLabelGenerator对象
- pieplot.setLabelGenerator(sp1);//设置饼图显示百分比
- //没有数据的时候显示的内容
- pieplot.setNoDataMessage("无数据显示");
- pieplot.setCircular(false);
- pieplot.setLabelGap(0.02D);
- pieplot.setIgnoreNullValues(true);//设置不显示空值
- pieplot.setIgnoreZeroValues(true);//设置不显示负值
- frame1=new ChartPanel (chart,true);
- chart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
- PiePlot piePlot= (PiePlot) chart.getPlot();//获取图表区域对象
- piePlot.setLabelFont(new Font("宋体",Font.BOLD,10));//解决乱码
- chart.getLegend().setItemFont(new Font("黑体",Font.BOLD,10));
- }
- private static DefaultPieDataset getDataSet() {
- DefaultPieDataset dataset = new DefaultPieDataset();
- dataset.setValue("苹果",100);
- dataset.setValue("梨子",200);
- dataset.setValue("葡萄",300);
- dataset.setValue("香蕉",400);
- dataset.setValue("荔枝",500);
- return dataset;
- }
- public ChartPanel getChartPanel(){
- return frame1;
- }
- }
效果图如下:
四, 实现折线图的java代码:
- package com.njue.testJFreeChart;
- import java.awt.Font;
- import java.text.SimpleDateFormat;
- import org.jfree.chart.ChartFactory;
- import org.jfree.chart.ChartPanel;
- import org.jfree.chart.JFreeChart;
- import org.jfree.chart.axis.DateAxis;
- import org.jfree.chart.axis.ValueAxis;
- import org.jfree.chart.plot.XYPlot;
- import org.jfree.data.time.Month;
- import org.jfree.data.time.TimeSeries;
- import org.jfree.data.time.TimeSeriesCollection;
- import org.jfree.data.xy.XYDataset;
- public class TimeSeriesChart {
- ChartPanel frame1;
- public TimeSeriesChart(){
- XYDataset xydataset = createDataset();
- JFreeChart jfreechart = ChartFactory.createTimeSeriesChart("Legal & General单位信托基金价格", "日期", "价格",xydataset, true, true, true);
- XYPlot xyplot = (XYPlot) jfreechart.getPlot();
- DateAxis dateaxis = (DateAxis) xyplot.getDomainAxis();
- dateaxis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
- frame1=new ChartPanel(jfreechart,true);
- dateaxis.setLabelFont(new Font("黑体",Font.BOLD,14)); //水平底部标题
- dateaxis.setTickLabelFont(new Font("宋体",Font.BOLD,12)); //垂直标题
- ValueAxis rangeAxis=xyplot.getRangeAxis();//获取柱状
- rangeAxis.setLabelFont(new Font("黑体",Font.BOLD,15));
- jfreechart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
- jfreechart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
- }
- private static XYDataset createDataset() { //这个数据集有点多,但都不难理解
- TimeSeries timeseries = new TimeSeries("legal & general欧洲指数信任",
- org.jfree.data.time.Month.class);
- timeseries.add(new Month(2, 2001), 181.80000000000001D);
- timeseries.add(new Month(3, 2001), 167.30000000000001D);
- timeseries.add(new Month(4, 2001), 153.80000000000001D);
- timeseries.add(new Month(5, 2001), 167.59999999999999D);
- timeseries.add(new Month(6, 2001), 158.80000000000001D);
- timeseries.add(new Month(7, 2001), 148.30000000000001D);
- timeseries.add(new Month(8, 2001), 153.90000000000001D);
- timeseries.add(new Month(9, 2001), 142.69999999999999D);
- timeseries.add(new Month(10, 2001), 123.2D);
- timeseries.add(new Month(11, 2001), 131.80000000000001D);
- timeseries.add(new Month(12, 2001), 139.59999999999999D);
- timeseries.add(new Month(1, 2002), 142.90000000000001D);
- timeseries.add(new Month(2, 2002), 138.69999999999999D);
- timeseries.add(new Month(3, 2002), 137.30000000000001D);
- timeseries.add(new Month(4, 2002), 143.90000000000001D);
- timeseries.add(new Month(5, 2002), 139.80000000000001D);
- timeseries.add(new Month(6, 2002), 137D);
- timeseries.add(new Month(7, 2002), 132.80000000000001D);
- TimeSeries timeseries1 = new TimeSeries("legal & general英国指数信任",
- org.jfree.data.time.Month.class);
- timeseries1.add(new Month(2, 2001), 129.59999999999999D);
- timeseries1.add(new Month(3, 2001), 123.2D);
- timeseries1.add(new Month(4, 2001), 117.2D);
- timeseries1.add(new Month(5, 2001), 124.09999999999999D);
- timeseries1.add(new Month(6, 2001), 122.59999999999999D);
- timeseries1.add(new Month(7, 2001), 119.2D);
- timeseries1.add(new Month(8, 2001), 116.5D);
- timeseries1.add(new Month(9, 2001), 112.7D);
- timeseries1.add(new Month(10, 2001), 101.5D);
- timeseries1.add(new Month(11, 2001), 106.09999999999999D);
- timeseries1.add(new Month(12, 2001), 110.3D);
- timeseries1.add(new Month(1, 2002), 111.7D);
- timeseries1.add(new Month(2, 2002), 111D);
- timeseries1.add(new Month(3, 2002), 109.59999999999999D);
- timeseries1.add(new Month(4, 2002), 113.2D);
- timeseries1.add(new Month(5, 2002), 111.59999999999999D);
- timeseries1.add(new Month(6, 2002), 108.8D);
- timeseries1.add(new Month(7, 2002), 101.59999999999999D);
- TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
- timeseriescollection.addSeries(timeseries);
- timeseriescollection.addSeries(timeseries1);
- return timeseriescollection;
- }
- public ChartPanel getChartPanel(){
- return frame1;
- }
- }
效果图如下:
再来看一下主方法:
- import java.awt.GridLayout;
- import javax.swing.JFrame;
- public class mainClass {
- public static void main(String args[]){
- JFrame frame=new JFrame("Java数据统计图");
- frame.setLayout(new GridLayout(2,2,10,10));
- frame.add(new BarChart().getChartPanel()); //添加柱形图
- frame.add(new BarChart1().getChartPanel()); //添加柱形图的另一种效果
- frame.add(new PieChart().getChartPanel()); //添加饼状图
- frame.add(new TimeSeriesChart().getChartPanel()); //添加折线图
- frame.setBounds(50, 50, 800, 600);
- frame.setVisible(true);
- }
- }
五, 总结
以上都是一个简单的例子去实现了,想了解更深的同学可自行查询资料,其实以上代码都通俗易懂,只要结合自己的实际情况,便可开发出属于自己的Application,大家可以看出我这里是在Application上实现的,其实更多情况数据统计图在javaweb上应用更多,大家也可自行了解。
ps:如运行本文工程项目是出现错误,请参考博文:http://blog.csdn.net/pzhtpf/article/details/7506135