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:
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1 import java.awt.Font;
2
3 import org.jfree.chart.ChartFactory;
4 import org.jfree.chart.ChartPanel;
5 import org.jfree.chart.JFreeChart;
6 import org.jfree.chart.axis.CategoryAxis;
7 import org.jfree.chart.axis.ValueAxis;
8 import org.jfree.chart.plot.CategoryPlot;
9 import org.jfree.chart.plot.PlotOrientation;
10 import org.jfree.data.category.CategoryDataset;
11 import org.jfree.data.category.DefaultCategoryDataset;
12
13 public class BarChart {
14 ChartPanel frame1;
15 public BarChart(){
16 CategoryDataset dataset = getDataSet();
17 JFreeChart chart = ChartFactory.createBarChart3D(
18 "水果", // 图表标题
19 "水果种类", // 目录轴的显示标签
20 "数量", // 数值轴的显示标签
21 dataset, // 数据集
22 PlotOrientation.VERTICAL, // 图表方向:水平、垂直
23 true, // 是否显示图例(对于简单的柱状图必须是false)
24 false, // 是否生成工具
25 false // 是否生成URL链接
26 );
27
28 //从这里开始
29 CategoryPlot plot=chart.getCategoryPlot();//获取图表区域对象
30 CategoryAxis domainAxis=plot.getDomainAxis(); //水平底部列表
31 domainAxis.setLabelFont(new Font("黑体",Font.BOLD,14)); //水平底部标题
32 domainAxis.setTickLabelFont(new Font("宋体",Font.BOLD,12)); //垂直标题
33 ValueAxis rangeAxis=plot.getRangeAxis();//获取柱状
34 rangeAxis.setLabelFont(new Font("黑体",Font.BOLD,15));
35 chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
36 chart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
37
38 //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
39
40 frame1=new ChartPanel(chart,true); //这里也可以用chartFrame,可以直接生成一个独立的Frame
41
42 }
43 private static CategoryDataset getDataSet() {
44 DefaultCategoryDataset dataset = new DefaultCategoryDataset();
45 dataset.addValue(100, "北京", "苹果");
46 dataset.addValue(100, "上海", "苹果");
47 dataset.addValue(100, "广州", "苹果");
48 dataset.addValue(200, "北京", "梨子");
49 dataset.addValue(200, "上海", "梨子");
50 dataset.addValue(200, "广州", "梨子");
51 dataset.addValue(300, "北京", "葡萄");
52 dataset.addValue(300, "上海", "葡萄");
53 dataset.addValue(300, "广州", "葡萄");
54 dataset.addValue(400, "北京", "香蕉");
55 dataset.addValue(400, "上海", "香蕉");
56 dataset.addValue(400, "广州", "香蕉");
57 dataset.addValue(500, "北京", "荔枝");
58 dataset.addValue(500, "上海", "荔枝");
59 dataset.addValue(500, "广州", "荔枝");
60 return dataset;
61 }
62 public ChartPanel getChartPanel(){
63 return frame1;
64
65 }
66 }
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:
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67 private static CategoryDataset getDataSet() {
68 DefaultCategoryDataset dataset = new DefaultCategoryDataset();
69 dataset.addValue(100, "苹果", "苹果");
70 dataset.addValue(200, "梨子", "梨子");
71 dataset.addValue(300, "葡萄", "葡萄");
72 dataset.addValue(400, "香蕉", "香蕉");
73 dataset.addValue(500, "荔枝", "荔枝");
74 return dataset;
75 }
效果图如下:
三, 实现饼状图的java代码:
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76 package com.njue.testJFreeChart;
77
78 import java.awt.Font;
79 import java.text.DecimalFormat;
80 import java.text.NumberFormat;
81
82 import javax.swing.JPanel;
83
84 import org.jfree.chart.ChartFactory;
85 import org.jfree.chart.ChartPanel;
86 import org.jfree.chart.JFreeChart;
87 import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
88 import org.jfree.chart.plot.PiePlot;
89 import org.jfree.data.general.DefaultPieDataset;
90
91 public class PieChart {
92 ChartPanel frame1;
93 public PieChart(){
94 DefaultPieDataset data = getDataSet();
95 JFreeChart chart = ChartFactory.createPieChart3D("水果产量",data,true,false,false);
96 //设置百分比
97 PiePlot pieplot = (PiePlot) chart.getPlot();
98 DecimalFormat df = new DecimalFormat("0.00%");//获得一个DecimalFormat对象,主要是设置小数问题
99 NumberFormat nf = NumberFormat.getNumberInstance();//获得一个NumberFormat对象
100 StandardPieSectionLabelGenerator sp1 = new StandardPieSectionLabelGenerator("{0} {2}", nf, df);//获得StandardPieSectionLabelGenerator对象
101 pieplot.setLabelGenerator(sp1);//设置饼图显示百分比
102
103 //没有数据的时候显示的内容
104 pieplot.setNoDataMessage("无数据显示");
105 pieplot.setCircular(false);
106 pieplot.setLabelGap(0.02D);
107
108 pieplot.setIgnoreNullValues(true);//设置不显示空值
109 pieplot.setIgnoreZeroValues(true);//设置不显示负值
110 frame1=new ChartPanel (chart,true);
111 chart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
112 PiePlot piePlot= (PiePlot) chart.getPlot();//获取图表区域对象
113 piePlot.setLabelFont(new Font("宋体",Font.BOLD,10));//解决乱码
114 chart.getLegend().setItemFont(new Font("黑体",Font.BOLD,10));
115 }
116 private static DefaultPieDataset getDataSet() {
117 DefaultPieDataset dataset = new DefaultPieDataset();
118 dataset.setValue("苹果",100);
119 dataset.setValue("梨子",200);
120 dataset.setValue("葡萄",300);
121 dataset.setValue("香蕉",400);
122 dataset.setValue("荔枝",500);
123 return dataset;
124 }
125 public ChartPanel getChartPanel(){
126 return frame1;
127
128 }
129 }
效果图如下:
四, 实现折线图的java代码:
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130 package com.njue.testJFreeChart;
131
132 import java.awt.Font;
133 import java.text.SimpleDateFormat;
134
135 import org.jfree.chart.ChartFactory;
136 import org.jfree.chart.ChartPanel;
137 import org.jfree.chart.JFreeChart;
138 import org.jfree.chart.axis.DateAxis;
139 import org.jfree.chart.axis.ValueAxis;
140 import org.jfree.chart.plot.XYPlot;
141 import org.jfree.data.time.Month;
142 import org.jfree.data.time.TimeSeries;
143 import org.jfree.data.time.TimeSeriesCollection;
144 import org.jfree.data.xy.XYDataset;
145
146 public class TimeSeriesChart {
147 ChartPanel frame1;
148 public TimeSeriesChart(){
149 XYDataset xydataset = createDataset();
150 JFreeChart jfreechart = ChartFactory.createTimeSeriesChart("Legal & General单位信托基金价格", "日期", "价格",xydataset, true, true, true);
151 XYPlot xyplot = (XYPlot) jfreechart.getPlot();
152 DateAxis dateaxis = (DateAxis) xyplot.getDomainAxis();
153 dateaxis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
154 frame1=new ChartPanel(jfreechart,true);
155 dateaxis.setLabelFont(new Font("黑体",Font.BOLD,14)); //水平底部标题
156 dateaxis.setTickLabelFont(new Font("宋体",Font.BOLD,12)); //垂直标题
157 ValueAxis rangeAxis=xyplot.getRangeAxis();//获取柱状
158 rangeAxis.setLabelFont(new Font("黑体",Font.BOLD,15));
159 jfreechart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
160 jfreechart.getTitle().setFont(new Font("宋体",Font.BOLD,20));//设置标题字体
161
162 }
163 private static XYDataset createDataset() { //这个数据集有点多,但都不难理解
164 TimeSeries timeseries = new TimeSeries("legal & general欧洲指数信任",
165 org.jfree.data.time.Month.class);
166 timeseries.add(new Month(2, 2001), 181.80000000000001D);
167 timeseries.add(new Month(3, 2001), 167.30000000000001D);
168 timeseries.add(new Month(4, 2001), 153.80000000000001D);
169 timeseries.add(new Month(5, 2001), 167.59999999999999D);
170 timeseries.add(new Month(6, 2001), 158.80000000000001D);
171 timeseries.add(new Month(7, 2001), 148.30000000000001D);
172 timeseries.add(new Month(8, 2001), 153.90000000000001D);
173 timeseries.add(new Month(9, 2001), 142.69999999999999D);
174 timeseries.add(new Month(10, 2001), 123.2D);
175 timeseries.add(new Month(11, 2001), 131.80000000000001D);
176 timeseries.add(new Month(12, 2001), 139.59999999999999D);
177 timeseries.add(new Month(1, 2002), 142.90000000000001D);
178 timeseries.add(new Month(2, 2002), 138.69999999999999D);
179 timeseries.add(new Month(3, 2002), 137.30000000000001D);
180 timeseries.add(new Month(4, 2002), 143.90000000000001D);
181 timeseries.add(new Month(5, 2002), 139.80000000000001D);
182 timeseries.add(new Month(6, 2002), 137D);
183 timeseries.add(new Month(7, 2002), 132.80000000000001D);
184 TimeSeries timeseries1 = new TimeSeries("legal & general英国指数信任",
185 org.jfree.data.time.Month.class);
186 timeseries1.add(new Month(2, 2001), 129.59999999999999D);
187 timeseries1.add(new Month(3, 2001), 123.2D);
188 timeseries1.add(new Month(4, 2001), 117.2D);
189 timeseries1.add(new Month(5, 2001), 124.09999999999999D);
190 timeseries1.add(new Month(6, 2001), 122.59999999999999D);
191 timeseries1.add(new Month(7, 2001), 119.2D);
192 timeseries1.add(new Month(8, 2001), 116.5D);
193 timeseries1.add(new Month(9, 2001), 112.7D);
194 timeseries1.add(new Month(10, 2001), 101.5D);
195 timeseries1.add(new Month(11, 2001), 106.09999999999999D);
196 timeseries1.add(new Month(12, 2001), 110.3D);
197 timeseries1.add(new Month(1, 2002), 111.7D);
198 timeseries1.add(new Month(2, 2002), 111D);
199 timeseries1.add(new Month(3, 2002), 109.59999999999999D);
200 timeseries1.add(new Month(4, 2002), 113.2D);
201 timeseries1.add(new Month(5, 2002), 111.59999999999999D);
202 timeseries1.add(new Month(6, 2002), 108.8D);
203 timeseries1.add(new Month(7, 2002), 101.59999999999999D);
204 TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
205 timeseriescollection.addSeries(timeseries);
206 timeseriescollection.addSeries(timeseries1);
207 return timeseriescollection;
208 }
209 public ChartPanel getChartPanel(){
210 return frame1;
211
212 }
213 }
效果图如下:
再来看一下主方法:
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214 import java.awt.GridLayout;
215
216 import javax.swing.JFrame;
217
218 public class mainClass {
219 public static void main(String args[]){
220 JFrame frame=new JFrame("Java数据统计图");
221 frame.setLayout(new GridLayout(2,2,10,10));
222 frame.add(new BarChart().getChartPanel()); //添加柱形图
223 frame.add(new BarChart1().getChartPanel()); //添加柱形图的另一种效果
224 frame.add(new PieChart().getChartPanel()); //添加饼状图
225 frame.add(new TimeSeriesChart().getChartPanel()); //添加折线图
226 frame.setBounds(50, 50, 800, 600);
227 frame.setVisible(true);
228 }
229 }
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。