jFreeChart利用CategoryDatase,ChartFactory.createLineChart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.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

public class CreateJFreeChartLine {   
  
    /**  
     * 创建JFreeChart Line Chart（折线图）  
     */  
    public static void main(String[] args) {   
        //步骤1：创建CategoryDataset对象（准备数据）   
        CategoryDataset dataset = createDataset();   
        //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\\line.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CategoryDataset创建JFreeChart对象   
    public static JFreeChart createChart(CategoryDataset categoryDataset) {   
        // 创建JFreeChart对象：ChartFactory.createLineChart   
        JFreeChart jfreechart = ChartFactory.createLineChart("Line 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）   
                categoryDataset, // 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。   
        CategoryPlot plot = (CategoryPlot) jfreechart.getPlot();   
        // 背景色 透明度   
        plot.setBackgroundAlpha(0.5f);   
        // 前景色 透明度   
        plot.setForegroundAlpha(0.5f);   
        // 其他设置 参考 CategoryPlot类   
  
        return jfreechart;   
    }   
  
    /**  
     * 创建CategoryDataset对象  
     *   
     */  
    public static CategoryDataset createDataset() {   
  
        String[] rowKeys = { "One", "Two", "Three" };   
        String[] colKeys = { "1987", "1997", "2007" };   
  
        double[][] data = { { 50, 20, 30 }, { 20, 10D, 40D },   
                { 40, 30.0008D, 38.24D }, };   
  
        // 或者使用类似以下代码   
        // DefaultCategoryDataset categoryDataset = new   
        // DefaultCategoryDataset();   
        // categoryDataset.addValue(10, "rowKey", "colKey");   
  
        return DatasetUtilities.createCategoryDataset(rowKeys, colKeys, data);   
    }   
}

 运行效果图：