piepic.java

一个小的门户的实现。

package chart.demo;

import java.awt.image.BufferedImage;
import java.io.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;

import org.jfree.data.*;
import org.jfree.data.category.*;
import org.jfree.chart.*;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.*;
import org.jfree.chart.ChartFactory;
import org.jfree.data.general.*;;

/**
 * 用于演示饼图的生成
 * @author Winter Lau
 */
public class piePic {

	public BufferedImage buffedImg()
	{		  DefaultPieDataset dataset = new DefaultPieDataset();
			   dataset.setValue("华夏影院", 109);
			   dataset.setValue("欧美影院", 49);
			   dataset.setValue("周星驰系列", 29);
			   dataset.setValue("刘德华系列", 17);
			   dataset.setValue("张曼玉系列", 14); 
			   dataset.setValue("日韩影院", 12);
			   dataset.setValue("张柏芝系列", 9);
			   dataset.setValue("付费电影", 0);   
			  
			 //  PiePlot pie = new PiePlot(dataset);
			 //  pie.setLabelGenerator(new StandardPieSectionLabelGenerator("{0} = ({2})"));
			   //通过工厂类生成JFreeChart对象
			  JFreeChart chart = ChartFactory.createPieChart3D("数据统计分析", dataset, true, false, false);
			  PiePlot plot = (PiePlot) chart.getPlot();

			  DecimalFormat df = (DecimalFormat)NumberFormat.getPercentInstance();
			  df.applyPattern("##0.0#%");



			  plot.setLabelGenerator(
				  new StandardPieSectionLabelGenerator("{0}=({2})",NumberFormat.getNumberInstance(),df)
				  );

			//  plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0}: ({1}, {2})"));
			   chart.setBackgroundPaint(java.awt.Color.white);
			  BufferedImage x = chart.createBufferedImage(600,400);
	return x;
	}
	public static void main(String[] args) throws IOException{
		DefaultPieDataset data = getDataSet();
		JFreeChart chart = ChartFactory.createPieChart3D("水果产量图",  // 图表标题
		data, 
		true, // 是否显示图例
		false,
		false
		);
		//写图表对象到文件，参照柱状图生成源码
		FileOutputStream fos_jpg = null;
		try {
			fos_jpg = new FileOutputStream("D:\\pie.jpg");
			ChartUtilities.writeChartAsJPEG(fos_jpg,100,chart,400,300,null);
		} finally {
			try {
				fos_jpg.close();
			} catch (Exception e) {}
		}
	}
	/**
	 * 获取一个演示用的简单数据集对象
	 * @return
	 */
	private static DefaultPieDataset getDataSet() {
		DefaultPieDataset dataset = new DefaultPieDataset();
		dataset.setValue("苹果",100);
		dataset.setValue("梨子",200);
		dataset.setValue("葡萄",300);
		dataset.setValue("香蕉",400);
		dataset.setValue("荔枝",500);
		return dataset;
	}
}