JFreeChart -- 柱状图实例解析

 

2D柱状图

 

package com;

import java.io.File;
import org.jfree.chart.ChartColor;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;

public class BarChartExample
{ 
 public static void main(String[] args)
 {
  // 创建一个柱状图
  DefaultCategoryDataset dataset = new DefaultCategoryDataset();
  // 装载数据
  dataset.setValue(6, "Profit", "Jane");
  dataset.setValue(3, "Profit2", "Jane");
  dataset.setValue(7, "Profit", "Tom");
  dataset.setValue(6, "Profit2", "Tom");
  dataset.setValue(8, "Profit", "Jill");
  dataset.setValue(9, "Profit2", "Jill");
  dataset.setValue(5, "Profit", "John");
  dataset.setValue(8, "Profit2", "John");
  dataset.setValue(12, "Profit", "Fred");
  dataset.setValue(11, "Profit2", "Fred");  
  
  // 产生柱状图
  // JFreeChart chart = ChartFactory.createXYLineChart("标题"，"x轴标志","y轴标志","设置数据","设置图形显示方向",是否显示图形,是否进行提示,是否配置报表存放地址);
  // 图形显示方向：
  // (1)HORIZONTAL:横向显示图形
  // (2)VERTICAL:纵向显示图形
  
  // 2D柱状图
  JFreeChart chart = ChartFactory.createBarChart("销售统计图","Salesman", "Profit", dataset, PlotOrientation.VERTICAL,false, true, false);

  try{   
//   // 创建图形显示面板
//   ChartFrame cf = new ChartFrame("柱状图",chart);
//   cf.pack();
//   // 设置图片大小
//   cf.setSize(500,300);
//   // 设置图形可见
//   cf.setVisible(true);
   
    // 保存图片到指定文件夹
    ChartUtilities.saveChartAsJPEG(new File("C:\\BarChart.jpg"), chart, 500, 300);
  } catch (Exception e){
   System.err.println("Problem occurred creating chart.");
  }
 }
}