由JFreeChart生成图片放到硬盘上

package com.mengya.test.jfreechart;

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

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;

/**
 * 由JFreeChart生成图片放到硬盘上 
 * 对于Swing程序可以由org.jfree.chart.ChartUtilities类完成图片的生成
 * 
 * @author 张明学
 * 
 */
public class JfreeChartTest3 {

	public static void main(String[] args) {

		JFreeChart chart = ChartFactory.createPieChart("某公司组织结构图",
				getDataset(), true, false, false);
		chart
				.setTitle(new TextTitle("某公司组织结构图", new Font("仿宋", Font.BOLD,
						20)));
		LegendTitle legend = chart.getLegend(0);
		legend.setItemFont(new Font("隶书", Font.TYPE1_FONT, 16));
		PiePlot plot = (PiePlot) chart.getPlot();
		plot.setLabelFont(new Font("宋体", Font.HANGING_BASELINE, 12));

		try {
			OutputStream os = new FileOutputStream("company.jpeg");
			try {
				// 由ChartUtilities生成文件到一个体outputStream中去
				ChartUtilities.writeChartAsJPEG(os, chart, 1000, 800);
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}

	}

	private static DefaultPieDataset getDataset() {
		DefaultPieDataset dpd = new DefaultPieDataset();
		dpd.setValue("管理人员", 25);
		dpd.setValue("市场人员", 10);
		dpd.setValue("开发人员", 50);
		dpd.setValue("其它人员", 15);
		return dpd;
	}

}

 

new Font("隶书", Font.TYPE1_FONT, 16);

资源是怎么释放的？