运用JFreeChart创建柱状图

package com.cs.jfreechart;

import java.awt.Color;
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.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

public class BarChartDemo {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		//生成柱状图
		JFreeChart chart = ChartFactory.createBarChart (
				"图书销售统计表",     //图表标题
				"图书",             //目录轴的显示标签
				"销量",             //数值轴的显示标签
				getDateSet(),      //数据
				//PlotOrientation.HORIZONTAL, //图表方向水平
				PlotOrientation.VERTICAL,    //图表方向垂直
				false,             //是否显示图例
				false,            //是否显示工具提示
				false             //是否生成URL
		);
		//设置标题及标题字体
		chart.setTitle(new TextTitle("图书销售统计图",new Font("黑体",Font.ITALIC,22)));
		//建一个图例
		//LegendTitle legendTitle = chart.getLegend(0);
		//设置图例字体
		//legendTitle.setItemFont(new Font("宋体",Font.BOLD,14));
		//获取柱状图plot对象
		CategoryPlot plot = (CategoryPlot) chart.getPlot();
		//设置柱型的颜色
		plot.getRenderer().setSeriesPaint(0, Color.blue);
		//取得横轴
		CategoryAxis categoryAxis = plot.getDomainAxis();
		//设置横轴的字体
		categoryAxis.setLabelFont(new Font("宋体",Font.BOLD,22));
		//设置分类标签以45度倾斜
		//categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
		//设置分类标签字体
		categoryAxis.setTickLabelFont(new Font("宋体",Font.BOLD,22));
		//取得纵轴
		NumberAxis numberAxis = (NumberAxis) plot.getRangeAxis();
		//设置纵轴的字体
		numberAxis.setLabelFont(new Font("宋体",Font.BOLD,22));
		//设置背景透明度（0~1）
		plot.setBackgroundAlpha(0.9f);
		//输出文件
		FileOutputStream fos = new FileOutputStream("book.jpg");
		//用ChartUtilities工具输出
		ChartUtilities.writeChartAsJPEG(fos, chart, 800, 600);
		fos.close();
	}
	
	private static CategoryDataset getDateSet() {
		//提供生成柱状图的数据
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		dataset.addValue(47,"","JAVA教程");
		dataset.addValue(23,"","c++教程");
		dataset.addValue(20,"","C#教程");
		dataset.addValue(10,"","VC++教程");
		return dataset;
	}

}