java怎麽生成折線圖,傳入月份（1,2,3）生產數量（100,200,300），然後生成壹個折線圖，最好是曲線圖，謝

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.swing.JPanel;

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.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.data.category.DefaultCategoryDataset;

import org.jfree.ui.ApplicationFrame;

import org.jfree.ui.RefineryUtilities;

public class LineCharts extends ApplicationFrame {

public LineCharts(String s) {

super(s);

setContentPane(createDemoLine());

}

public static void main(String[] args) {

LineCharts fjc = new LineCharts("折線圖");

fjc.pack();

RefineryUtilities.centerFrameOnScreen(fjc);

fjc.setVisible(true);

}

// 生成顯示圖表的面板 public static JPanel createDemoLine() {

JFreeChart jfreechart = createChart(createDataset());

saveAsFile(jfreechart, "D://testline.png", 500, 300);

return new ChartPanel(jfreechart);

}

// 生成圖表主對象JFreeChart public static JFreeChart createChart(DefaultCategoryDataset linedataset) {

//定義圖表對象

JFreeChart chart = ChartFactory.createLineChart("LineChart", // chart title

"Time", // domain axis label

"Quantity", // range axis label

linedataset, // data

PlotOrientation.VERTICAL, // orientation

true, // include legend

true, // tooltips

false // urls

);

CategoryPlot plot = chart.getCategoryPlot();

// customise the range axis...

NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

rangeAxis.setAutoRangeIncludesZero(true);

rangeAxis.setUpperMargin(1);

rangeAxis.setLabelAngle(Math.PI / 2.0);

return chart; }

//生成數據 public static DefaultCategoryDataset createDataset() {

DefaultCategoryDataset linedataset = new DefaultCategoryDataset();

// 各曲線名稱

String series1 = "car";

// 橫軸名稱(列名稱)

String type1 = "Jan";

String type2 = "Feb";

String type3 = "Mar";

linedataset.addValue(100, series1, type1); linedataset.addValue(200, series1, type2);

linedataset.addValue(300, series1, type3);

return linedataset; }

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);

// 保存為PNG文件

ChartUtilities.writeChartAsPNG(out, chart, 600, 350);

out.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (out != null) {

try {

out.close();

} catch (IOException e) {

// do nothing

}

}

}

}

}