jfreechart一个简单例子

package com.point.jfsc.boss.web.report.jfreechart;

import java.awt.Font;
import java.awt.RenderingHints;
import java.io.FileOutputStream;
import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;

/**
 * 该类用于演示最简单的柱状图生成
 * @author Winter Lau
 */
public class BarChartDemo {
        public static void main(String[] args) {
             //得到数据，比如从数据库查询
                CategoryDataset dataset = getDataSet2();
                //构造chart
                JFreeChart chart = ChartFactory.createBarChart3D(
                                                        "水果产量图", // 图表标题
                                                        "水果", // 目录轴的显示标签
                                                        "产量", // 数值轴的显示标签
                                                        dataset, // 数据集
                                                        PlotOrientation.VERTICAL, // 图表方向：水平、
                                                        true,   // 是否显示图例(对于简单的柱状图必须
                                                        false,  // 是否生成工具
                                                        false   // 是否生成URL链接
                                                        );

               //处理chart中文显示问题
                processChart(chart);
               
                //chart输出图片
                writeChart2Image(chart);
               
                //chart 以swing形式输出
                ChartFrame pieFrame = new ChartFrame("公司组织家", chart);
               pieFrame.pack();
               pieFrame.setVisible(true);  
               
        }
       /**
         * 获取一个演示用的组合数据集对象
         * @return
         */
        private static CategoryDataset getDataSet2() {
                DefaultCategoryDataset dataset = new DefaultCategoryDataset();
                dataset.addValue(100, "北京", "苹果");
                dataset.addValue(100, "上海", "苹果");
                dataset.addValue(100, "广州", "苹果");
                dataset.addValue(200, "北京", "梨子");
                dataset.addValue(200, "上海", "梨子");
                dataset.addValue(200, "广州", "梨子");
                dataset.addValue(300, "北京", "葡萄");
                dataset.addValue(300, "上海", "葡萄");
                dataset.addValue(300, "广州", "葡萄");
                dataset.addValue(400, "北京", "香蕉");
                dataset.addValue(400, "上海", "香蕉");
                dataset.addValue(400, "广州", "香蕉");
                dataset.addValue(500, "北京", "荔枝");
                dataset.addValue(500, "上海", "荔枝");
                dataset.addValue(500, "广州", "荔枝");
                return dataset;
        }
        /**
         * 解决图表汉字显示问题
         * @param chart
         */
        private static void processChart(JFreeChart chart ){
          CategoryPlot plot = chart.getCategoryPlot();
             CategoryAxis domainAxis = plot.getDomainAxis();
             ValueAxis rAxis = plot.getRangeAxis();
             chart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
             TextTitle textTitle = chart.getTitle();
             textTitle.setFont(new Font("宋体", Font.PLAIN, 20));
             domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));
             domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
             rAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));
             rAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));     
             chart.getLegend().setItemFont(new Font("宋体",Font.PLAIN,12)); 
//           renderer.setItemLabelGenerator(new LabelGenerator(0.0));
//           renderer.setItemLabelFont(new Font("宋体", Font.PLAIN, 12));
//           renderer.setItemLabelsVisible(true);
        }
        /**
         * 输出图片
         * @param chart
         */
       private static void writeChart2Image(JFreeChart chart){
        FileOutputStream fos_jpg = null;
           try {
                   fos_jpg = new FileOutputStream("D:\\fruit.jpg");
                   ChartUtilities.writeChartAsJPEG(fos_jpg,1,chart,400,300,null);
           }catch(Exception e){
            e.printStackTrace();
           } finally {
                   try {
                           fos_jpg.close();
                   } catch (Exception e) {}
           }
       }
}