java利用JFreeChart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。
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