使用JFreeChart創建餅圖

轉自  ： http://hua04104.iteye.com/blog/704094
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.plot.PiePlot;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.general.DefaultPieDataset;

public class PieChartDemo {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        //生成餅圖
        JFreeChart chart = ChartFactory.createPieChart(
                "圖書銷售統計表",     //圖表標題
                getDateSet(),      //數據
                true,             //是否顯示圖例
                false,            //是否顯示工具提示
                false             //是否生成URL
        );
        //設置標題及標題字體
        chart.setTitle(new TextTitle("圖書銷售統計圖",new Font("黑體",Font.ITALIC,22)));
        //建一個圖例
        LegendTitle legendTitle = chart.getLegend(0);
        //設置圖例字體
        legendTitle.setItemFont(new Font("宋體",Font.BOLD,14));
        //獲取餅圖plot對象
        PiePlot plot = (PiePlot) chart.getPlot();
        //根據key指定各個數據餅圖的顏色
        plot.setSectionPaint("JAVA教程", Color.RED);
        plot.setSectionPaint("c++教程", Color.BLUE);
        plot.setSectionPaint("C#教程", Color.GREEN);
        plot.setSectionPaint("VC++教程", Color.ORANGE);
        //設置plot字體
        plot.setLabelFont(new Font("宋體",Font.BOLD,18));
        //設置背景透明度（0~1）
        plot.setBackgroundAlpha(0.9f);
        //輸出文件
        FileOutputStream fos = new FileOutputStream("book.jpg");
        //用ChartUtilities工具輸出
        ChartUtilities.writeChartAsJPEG(fos, chart, 800, 600);
        fos.close();
    }

    private static DefaultPieDataset getDateSet() {
        //提供生成餅圖的數據
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("JAVA教程", 47);
        dataset.setValue("c++教程", 23);
        dataset.setValue("C#教程", 20);
        dataset.setValue("VC++教程", 10);
        return dataset;
    }

}