使用java实现各种数据统计图(柱形图,饼图,折线图)

时间:2022-03-06 10:12:05

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:

使用java实现各种数据统计图(柱形图,饼图,折线图)

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:

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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:

使用java实现各种数据统计图(柱形图,饼图,折线图)

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:

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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:

 使用java实现各种数据统计图(柱形图,饼图,折线图)

三 实现饼状图的java代码:

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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:

使用java实现各种数据统计图(柱形图,饼图,折线图)

四 实现折线图的java代码:

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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:

使用java实现各种数据统计图(柱形图,饼图,折线图)

再来看一下主方法:

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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。