www.pudn.com > online-trading.rar > BarChartDemo.java

package com.bjsxt.shopping.test; 
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.PlotOrientation; 
import org.jfree.data.category.CategoryDataset; 
import org.jfree.data.category.DefaultCategoryDataset; 
/** 
 * 该类用于演示最简单的柱状图生成 
 * @author Winter Lau 
 */ 
public class BarChartDemo { 
	public static void main(String[] args) throws IOException{ 
		CategoryDataset dataset = getDataSet(); 
		JFreeChart chart = ChartFactory.createBarChart3D( 
							"水果产量图", // 图表标题 
							"水果", // 目录轴的显示标签 
							"产量", // 数值轴的显示标签 
							dataset, // 数据集 
							PlotOrientation.VERTICAL, // 图表方向：水平、垂直 
							true, 	// 是否显示图例(对于简单的柱状图必须是false) 
							false, 	// 是否生成工具 
							false 	// 是否生成URL链接 
							); 
							 
		FileOutputStream fos_jpg = null; 
		try { 
			fos_jpg = new FileOutputStream("D:\\fruit.jpg"); 
			ChartUtilities.writeChartAsJPEG(fos_jpg,1,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 CategoryDataset getDataSet() { 
		DefaultCategoryDataset dataset = new DefaultCategoryDataset(); 
		dataset.addValue(100, "aaa", "苹果"); 
		dataset.addValue(200, "aaa", "梨子"); 
		dataset.addValue(300, "aaa", "葡萄"); 
		dataset.addValue(400, "aaa", "香蕉"); 
		dataset.addValue(500, "aaa", "荔枝"); 
		return dataset; 
	} 
	/** 
	 * 获取一个演示用的组合数据集对象 
	 * @return 
	 */ 
	private static CategoryDataset getDataSet2() { 
		DefaultCategoryDataset dataset = new DefaultCategoryDataset(); 
		dataset.addValue(100, "北京", "苹果"); 
		dataset.addValue(100, "上海", "苹果"); 
		dataset.addValue(100, "广州", "苹果"); 
		dataset.addValue(200, "北京", "梨子"); 
		dataset.addValue(200, "上海", "梨子"); 
		dataset.addValue(200, "广州", "梨子"); 
		dataset.addValue(300, "北京", "葡萄"); 
		dataset.addValue(300, "上海", "葡萄"); 
		dataset.addValue(300, "广州", "葡萄"); 
		dataset.addValue(400, "北京", "香蕉"); 
		dataset.addValue(400, "上海", "香蕉"); 
		dataset.addValue(400, "广州", "香蕉"); 
		dataset.addValue(500, "北京", "荔枝"); 
		dataset.addValue(500, "上海", "荔枝"); 
		dataset.addValue(500, "广州", "荔枝"); 
		return dataset; 
	} 
}