用JFreeChart實現簡單的柱狀圖和餅狀圖

用JFreeChart實現簡單的柱狀圖和餅狀圖,簡單便於理解.

java 代碼

package test;

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

import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;

public class ChartDemo {

    public static void main(String[] args)
    {
        ChartDemo chartD = new ChartDemo();
        chartD.createBarDemo("bar1.jpg");
        chartD.createPieDemo("pie.jpg");

    }

    //創建柱狀圖
    public void createBarDemo(String jpgname)
    {
        CategoryDataset dataset = getBarDataset();
        JFreeChart chart = ChartFactory.createBarChart3D(
                "水果產量圖", "水果","產量", dataset, PlotOrientation.VERTICAL,
                true,false,false);

        FileOutputStream jpg = null;
        try {
            jpg = new FileOutputStream(jpgname);
            ChartUtilities.writeChartAsJPEG(jpg,0.5f,chart,400,300,null);


        } catch (Exception e) {
            // TODO 自動生成 catch 塊
            e.printStackTrace();
        }
        finally
        {
            try {
                jpg.close();
            } catch (IOException e) {
                // TODO 自動生成 catch 塊
                e.printStackTrace();
            }
        }
    }

    //獲取柱狀圖數據
    private CategoryDataset getBarDataset() {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(100, "北京", "蘋果");
        dataset.addValue(200, "上海", "梨子");
        dataset.addValue(300, "南昌", "葡萄");
        dataset.addValue(400, "海南", "香蕉");
        dataset.addValue(500, "北京", "荔枝");
        dataset.addValue(-250, "上海", "荔枝");
        return dataset;
    }

    //創建餅圖
    public void createPieDemo(String jpgname)
    {
        DefaultPieDataset dataset = getPieDataset();
        JFreeChart chart = ChartFactory.createPieChart3D("水果產量", dataset, true, true, true);

        FileOutputStream jpg = null;
        try {
            jpg = new FileOutputStream(jpgname);
            ChartUtilities.writeChartAsJPEG(jpg,0.5f,chart,400,300,null);


        } catch (Exception e) {
            // TODO 自動生成 catch 塊
            e.printStackTrace();
        }
        finally
        {
            try {
                jpg.close();
            } catch (IOException e) {
                // TODO 自動生成 catch 塊
                e.printStackTrace();
            }
        }
    }

    //獲取餅圖數據
    private DefaultPieDataset getPieDataset() {
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("蘋果", 100);
        dataset.setValue("梨子", 200);
        dataset.setValue("葡萄", 300);
        dataset.setValue("荔枝", 400);
        dataset.setValue("香蕉", 500);
        dataset.setValue("棗子", 600);
        return dataset;
    }

}