用JFreeChart實現簡單的柱狀圖和餅狀圖

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");    
            
    }    
        
     //建立柱狀圖    
     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;    
    }    
        
     //建立餅圖    
     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;         }              }