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;
}
}