使用JFreeChart生成复杂柱状图实例（生成图片）-优快云博客

本文介绍了一个使用 JFreeChart 库生成3D柱状图的Java示例程序，该程序绘制了不同城市的图书销售统计数据，并展示了如何设置图表样式、导出为图片等。

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package com.lhhc.jfreechart.test;

import java.awt.Font;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

public class BarChart3DDemo1 {

    /**
     * @param args
     */
    public static void main(String[] args) throws IOException{
        JFreeChart chart=ChartFactory.createBarChart3D(
                "图书销量统计图",
                "图书",//目录轴的显示标签
                "销量",//数值轴的显示标签
                getDataSet(),
                PlotOrientation.VERTICAL,//设置图表方向
                true,//复杂柱状图
                false,
                false        
        );
        //取得统计图表的第一个图例
        LegendTitle legend =chart.getLegend(0);
        //修改图例的字体
        legend.setItemFont(new Font("宋体",Font.BOLD,14));


        //设置标题
        chart.setTitle(new TextTitle("图书销量统计图",new Font("黑体",Font.ITALIC,22)));
        //设置图表部分
        CategoryPlot plot=(CategoryPlot)chart.getPlot();

        CategoryAxis categoryAxis=plot.getDomainAxis();//取得横轴
        categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,22));//设置横轴显示标签的字体
        categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);//分类标签以４５度倾斜
        categoryAxis.setTickLabelFont(new Font("宋体",Font.BOLD,18));//分类标签字体

        NumberAxis numberAxis=(NumberAxis)plot.getRangeAxis();//取得纵轴
        numberAxis.setLabelFont(new Font("宋体",Font.BOLD,42));//设置纵轴显示标签字体
        FileOutputStream fos=null;
        fos=new FileOutputStream("book2.jpg");
        ChartUtilities.writeChartAsJPEG(
                fos,
                1,
                chart,
                800,
                600,
                null

        );
        fos.close();
    }
    private static CategoryDataset getDataSet(){
        DefaultCategoryDataset dataset=new DefaultCategoryDataset();
        dataset.addValue(47000,"北京", "Spring2.0宝典");
        dataset.addValue(38000,"北京","轻量级的J@EEE");
        dataset.addValue(38000, "北京", "JavaScript权威指南");
        dataset.addValue(25000, "北京", "Ajax In Action");
        dataset.addValue(37000,"上海", "Spring2.0宝典");
        dataset.addValue(37000,"上海","轻量级的J@EEE");
        dataset.addValue(24000, "上海", "JavaScript权威指南");
        dataset.addValue(26000, "上海", "Ajax In Action");
        dataset.addValue(17000,"广州", "Spring2.0宝典");
        dataset.addValue(48000,"广州","轻量级的J@EEE");
        dataset.addValue(21000, "广州", "JavaScript权威指南");
        dataset.addValue(35000, "广州", "Ajax In Action");
        dataset.addValue(46000,"长春", "Spring2.0宝典");
        dataset.addValue(21000,"长春","轻量级的J@EEE");
        dataset.addValue(22000, "长春", "JavaScript权威指南");
        dataset.addValue(22000, "长春", "Ajax In Action");
        return dataset;


    }

}