jFreeChart利用CategoryDatase,ChartFactory.createXYLineChart生成的折线图

package com.potevio.rnd;

import java.io.File;
import java.io.FileNotFoundException;
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.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class CreateJFreeChartXYLine {  
  
    /**  
     * 创建JFreeChart LineXY Chart(折线图)  
     */  
    public static void main(String[] args) {   
        //步骤1:创建XYDataset对象(准备数据)   
        XYDataset dataset = createXYDataset();   
        //步骤2:根据Dataset 生成JFreeChart对象,以及做相应的设置   
        JFreeChart freeChart = createChart(dataset);   
        //步骤3:将JFreeChart对象输出到文件,Servlet输出流等   
        saveAsFile(freeChart, "F:\\jfreechart\\lineXY.png", 600, 400);   
    }   
  
    // 保存为文件   
    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PNG   
            ChartUtilities.writeChartAsPNG(out, chart, weight, height);   
            // 保存为JPEG   
            // ChartUtilities.writeChartAsJPEG(out, chart, weight, height);   
            out.flush();   
        } catch (FileNotFoundException e) {   
            e.printStackTrace();   
        } catch (IOException e) {   
            e.printStackTrace();   
        } finally {   
            if (out != null) {   
                try {   
                    out.close();   
                } catch (IOException e) {   
                    // do nothing   
                }   
            }   
        }   
    }   
  
    // 根据XYDataset创建JFreeChart对象   
    public static JFreeChart createChart(XYDataset dataset) {   
        // 创建JFreeChart对象:ChartFactory.createXYLineChart   
        JFreeChart jfreechart = ChartFactory.createXYLineChart("XYLine Chart Demo", // 标题   
                "年分", // categoryAxisLabel (category轴,横轴,X轴标签)   
                "数量", // valueAxisLabel(value轴,纵轴,Y轴的标签)   
                dataset, // dataset   
                PlotOrientation.VERTICAL,
                true, // legend   
                false, // tooltips   
                false); // URLs   
  
        // 使用CategoryPlot设置各种参数。以下设置可以省略。   
        XYPlot plot = (XYPlot) jfreechart.getPlot();   
        // 背景色 透明度   
        plot.setBackgroundAlpha(0.5f);   
        // 前景色 透明度   
        plot.setForegroundAlpha(0.5f);   
        // 其它设置可以参考XYPlot类   
  
        return jfreechart;   
    }   
  
    /**  
     * 创建XYDataset对象  
     *   
     */  
    private static XYDataset createXYDataset() {   
        XYSeries xyseries1 = new XYSeries("One");   
        xyseries1.add(1987, 50);   
        xyseries1.add(1997, 20);   
        xyseries1.add(2007, 30);   
           
        XYSeries xyseries2 = new XYSeries("Two");   
        xyseries2.add(1987, 20);   
        xyseries2.add(1997, 10D);   
        xyseries2.add(2007, 40D);   
           
  
        XYSeries xyseries3 = new XYSeries("Three");   
        xyseries3.add(1987, 40);   
        xyseries3.add(1997, 30.0008);   
        xyseries3.add(2007, 38.24);   
           
  
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();   
  
        xySeriesCollection.addSeries(xyseries1);   
        xySeriesCollection.addSeries(xyseries2);   
        xySeriesCollection.addSeries(xyseries3);   
           
        return xySeriesCollection;   
    }   
}

 运行效果图:

 
jFreeChart利用CategoryDatase,ChartFactory.createXYLineChart生成的折线图
 

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