jfreechart实现柱状图排序

     今天在网上查了一下，没有发现 Jfreechart柱状图排序的实现方法，也还没来得及研究Jfreechart的代码和文档，所以就自己实现了一下。可能jfreechart自身有这个功能，可是发现以前的这个功能无效了，不知道用什么新方法实现这个功能了，所以只好自己实现了。
     

package my;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GradientPaint;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
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.renderer.category.BarRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * jfreechart排序柱状图.
 */
public class MyBarPic extends ApplicationFrame {

    /**
     * 
     * 构造函数，进行初始化操作
     *
     * @param title  the frame title.
     */
    public MyBarPic(String title) {
        super(title);
        CategoryDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartPanel);
        saveAsFile(chart, "D:\\图\\第一.jpg", 430, 200);
    }

    
/**
 * 生成数据集
 * 
 * @return
 */
private static CategoryDataset createDataset() {

	/**
	 * 
	 * 数据集数据存放对象
	 * 
	 * @author newlife111
	 *
	 */
	class ThreeData  implements Comparator{
		String rowKey;//行标签
		String colKey;//列标签
		double value;//值
		
		ThreeData(){
		}
		
		ThreeData(double value, String rowKey, String colKey){
			this.value = value;
			this.rowKey = rowKey;
			this.colKey = colKey;
		}
		
		/*
		 * 比较的算法
		 */
		public int compare(Object obj1, Object obj2) {
			double valueTmp = ((ThreeData)obj1).value - ((ThreeData)obj2).value;
			return valueTmp > 0 ? -1 : (valueTmp < 0 ? 1 : 0); 
		}
		
	}

	/*
	 * 存放数据
	 */
	List list = new ArrayList();
	list.add(new ThreeData(100.00d, "xx", "苹\n果"));
	list.add(new ThreeData(200.00d, "xx", "葡\n萄"));
	list.add(new ThreeData(50.00d, "xx", "雪\n梨"));
	list.add(new ThreeData(24.00d, "xx", "香\n蕉"));
	list.add(new ThreeData(65.00d, "xx", "橘\n子"));
	list.add(new ThreeData(125.00d, "xx", "柑\n橘"));
	list.add(new ThreeData(198.00d, "xx", "柚\n子"));
	list.add(new ThreeData(160.00d, "xx", "草\n莓"));
	//进行排序
	Collections.sort(list,new ThreeData());
	
	/*
	 * 添加数据进数据集
	 */
	DefaultCategoryDataset dataset = new DefaultCategoryDataset();
	Iterator iter = list.iterator();
	while(iter.hasNext()) {
		ThreeData threeDataTmp = (ThreeData)iter.next();
		dataset.addValue(threeDataTmp.value, threeDataTmp.rowKey, threeDataTmp.colKey);
	}
	return dataset;
}

    /**
     * 生成图片.
     *
     * @param dataset  数据集.
     *
     * @return chart 图片对象
     */
    private static JFreeChart createChart(CategoryDataset dataset) {
        JFreeChart chart = ChartFactory.createBarChart(
            "xxx",       // 图片标题
            "xxx",               // 横轴标题
            "xxx",                  // 纵轴标题
            dataset,                  // 数据集
            PlotOrientation.VERTICAL, // 图形方向
            true,                     // 是否legend
            true,                     // 图形提示
            false                     // 图形url
        );
        //设置图片背景色
        chart.setBackgroundPaint(Color.white);
        //获得数据区对象
        CategoryPlot plot = (CategoryPlot) chart.getPlot();
        //设置图形背景色
        plot.setBackgroundPaint(Color.white);
        //横轴网格显示
        plot.setDomainGridlinesVisible(true);
        //横轴网格颜色
        plot.setRangeGridlinePaint(Color.black);
        
        /*
         * 图形相关设置
         */        
        BarRenderer renderer = (BarRenderer) plot.getRenderer();
        renderer.setDrawBarOutline(false);
        renderer.setBaseItemLabelFont(new Font("黑体", Font.BOLD, 12));
        renderer.setBaseLegendTextFont(new Font("Simsun", 0, 10));
        renderer.setBaseItemLabelsVisible(true);
        renderer.setMaximumBarWidth(0.05f);
        renderer.setDrawBarOutline(false);
        renderer.setShadowVisible(false);
        
        /*
         * 纵轴相关设置
         */
        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        rangeAxis.setLabelFont(new Font("Simsun", 0, 12));

        /*
         * 图形1颜色设置
         */
        GradientPaint gp0 = new GradientPaint(0.5f, 0.5f, new Color(100,100,255),
                0.0f, 0.0f, new Color(0, 0, 64));
        renderer.setSeriesPaint(0, gp0);
        
        /*
         * 横轴相关设置
         */
        CategoryAxis domainAxis = plot.getDomainAxis();
        domainAxis.setLabelFont(new Font("Simsun", Font.BOLD, 12));
        //Font.BOLD字符加粗可使标签显示清楚些
        domainAxis.setTickLabelFont(new Font("Simsun", Font.BOLD, 8));
        domainAxis.setLowerMargin(0.03f);
        //这里设置横轴标签可显示行数，在数据集的横轴字符串上用\n可实现标签字符垂直
        domainAxis.setMaximumCategoryLabelLines(255);
        domainAxis.setCategoryLabelPositionOffset(3);
        return chart;
    }

    /**
     * 程序入口
     *
     * @param args  
     */
    public static void main(String[] args) {
        MyBarPic demo = new MyBarPic("FirstPic");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }
    
	/**
	 * 
	 * 保存为文件
	 * 
	 * @param chart 图片对象
	 * @param outputPath 保存路径
	 * @param weight 宽
	 * @param height 高
	 */
	public static void saveAsFile(JFreeChart chart, String outputPath,
			int weight, int height) {
		FileOutputStream out = null;
		try {
			File outFile = new File(outputPath);
			if (!outFile.getParentFile().exists()) {
				outFile.getParentFile().mkdirs();
			}
			out = new FileOutputStream(outputPath);
			//保存为JPEG
			ChartUtilities.writeChartAsJPEG(out,chart,800,600);
			out.flush();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					
				}
			}
		}
	}

}