怎么用java做柱形图 – CSS – 前端，css新增单位

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：

但大家把private static CategoryDataset getDataSet(){}方法中的数据变化一下后，又会形成另一种效果，比如说大家改成：

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);

}

}