随着时代的不断进步与高速发展，越来越多的人开始谋求不同的发展，新兴技术的学习是大多数人的选择。今天就为大家介绍一下java中的数据统计图的分类，并且通过具体的图片及实例为大家展示。
首先，java中的数据统计图主要包括柱形图、饼状图和折线图三种。接下来我们看一下应该如何操作。
所有操作的共同步骤是：1.建立java项目，在这个项目上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;7.成功后，项目中会多一个文件夹为：Referenced Libraries。
然后下面是各个分类的代码展示。
一、柱形图代码展示：
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：
假如我们把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：
二、饼状图的代码展示：
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(0.02 D);
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：
三、折线图的代码展示：
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), 181.80000000000001 D);
timeseries.add(new Month(3, 2001), 167.30000000000001 D);
timeseries.add(new Month(4, 2001), 153.80000000000001 D);
timeseries.add(new Month(5, 2001), 167.59999999999999 D);
timeseries.add(new Month(6, 2001), 158.80000000000001 D);
timeseries.add(new Month(7, 2001), 148.30000000000001 D);
timeseries.add(new Month(8, 2001), 153.90000000000001 D);
timeseries.add(new Month(9, 2001), 142.69999999999999 D);
timeseries.add(new Month(10, 2001), 123.2 D);
timeseries.add(new Month(11, 2001), 131.80000000000001 D);
timeseries.add(new Month(12, 2001), 139.59999999999999 D);
timeseries.add(new Month(1, 2002), 142.90000000000001 D);
timeseries.add(new Month(2, 2002), 138.69999999999999 D);
timeseries.add(new Month(3, 2002), 137.30000000000001 D);
timeseries.add(new Month(4, 2002), 143.90000000000001 D);
timeseries.add(new Month(5, 2002), 139.80000000000001 D);
timeseries.add(new Month(6, 2002), 137 D);
timeseries.add(new Month(7, 2002), 132.80000000000001 D);
TimeSeries timeseries1 = new TimeSeries("legal & general英国指数信任"
, org.jfree.data.time.Month.class);
timeseries1.add(new Month(2, 2001), 129.59999999999999 D);
timeseries1.add(new Month(3, 2001), 123.2 D);
timeseries1.add(new Month(4, 2001), 117.2 D);
timeseries1.add(new Month(5, 2001), 124.09999999999999 D);
timeseries1.add(new Month(6, 2001), 122.59999999999999 D);
timeseries1.add(new Month(7, 2001), 119.2 D);
timeseries1.add(new Month(8, 2001), 116.5 D);
timeseries1.add(new Month(9, 2001), 112.7 D);
timeseries1.add(new Month(10, 2001), 101.5 D);
timeseries1.add(new Month(11, 2001), 106.09999999999999 D);
timeseries1.add(new Month(12, 2001), 110.3 D);
timeseries1.add(new Month(1, 2002), 111.7 D);
timeseries1.add(new Month(2, 2002), 111 D);
timeseries1.add(new Month(3, 2002), 109.59999999999999 D);
timeseries1.add(new Month(4, 2002), 113.2 D);
timeseries1.add(new Month(5, 2002), 111.59999999999999 D);
timeseries1.add(new Month(6, 2002), 108.8 D);
timeseries1.add(new Month(7, 2002), 101.59999999999999 D);
TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
timeseriescollection.addSeries(timeseries);
timeseriescollection.addSeries(timeseries1);
return timeseriescollection;
}
public ChartPanel getChartPanel()
{
return frame1;
}
}效果图如下：
上述就是关于在java中数据统计图的分类以及实际操作过程了。想要了解更多java经典例子及常见问题，敬请关注奇Q工具网。
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