jfree chart -饼状图

代码如下

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 饼状图（飞掉的饼）
 */
public class PieChart {
    FileOutputStream fos = null;

    public static void main(String[] args) throws IOException {
        DefaultPieDataset dataset = new DefaultPieDataset();
        //key,value
        //如果设置为null或者0只看到显示看不得值
        dataset.setValue("hadoop", 100);
        dataset.setValue("spark", 300);
        dataset.setValue("fink", 200);
        dataset.setValue("storm", 150);
        //绘制饼状图
        //绘制3d createPieChart3D
        JFreeChart chart = ChartFactory.createPieChart(
                "big Data",
                dataset, true, false, false);
        FileOutputStream fos = null;
        //炸开的饼
        PiePlot plot = (PiePlot) chart.getPlot();
        plot.setExplodePercent("hadoop", 0.3);
        //忽略值为0或为null的数据
        plot.setIgnoreZeroValues(true);
        plot.setIgnoreNullValues(true);
        try {

            fos = new FileOutputStream("target/pie.png");
            ChartUtilities.writeChartAsPNG(fos, chart, 400, 300);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            System.out.println("图表绘制结束");
            fos.close();
        }
    }
}

运行结果