Beispiele für die Generierung von JFreeChart-Diagrammen (Kreisdiagramme, Balkendiagramme, Liniendiagramme, Zeitreihendiagramme)

import java.awt.BasicStroke;
import java.awt.Color;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
  
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
  
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.chart.*;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.axis.DateTickUnitType;
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.plot.XYPlot;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import com.lowagie.text.Font;
  
  
import demo.BarChart3DDemo1;
  
  
/**
 * Servlet implementation class ChartDemoServlet
 */
public class ChartDemoServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
    public ChartDemoServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
  
     
    public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException{
      
     response.setContentType("image/jpeg");
     DefaultPieDataset data = getDataSet();
     CategoryDataset dataset = getDataSet2();
     DefaultCategoryDataset linedataset = createDataset();
      
  //JFreeChart chart = ChartFactory.createPieChart3D("水果产量图", data, true, false, false);
   
     /**
  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、垂直
    true,  // 是否显示图例(对于简单的柱状图必须是 false)
    false, // 是否生成工具
    false  // 是否生成 URL 链接
    );
  **/
      
  JFreeChart chart = ChartFactory.createLineChart(
    "折线图", // 图表标题
       "时间", // 横轴显示标签
       "销售额(百万)", // 纵轴显示标签
       linedataset, // 数据集
       PlotOrientation.VERTICAL, // 图表方向：水平、垂直
       true, // 是否显示图例标识(对于简单的柱状图必须是 false)
       true, // 是否生成工具
       false // 是否生成 URL 链接
       );
   
     /*
  JFreeChart chart=ChartFactory.createTimeSeriesChart(
    "编程词典全国销量统计"
    , "销售月份"
    , "销量（份）"
    , createtimedata()
    , false
    , false
    , false
    );
  */
  /*
   * jfreechart1.0.13生成的图片中，中文都以方框形式显示,中文乱码解决如下（包括：饼图、柱状图、时序图、折线图）。
   */
  /***设置饼图相关属性***/
  /*
  PiePlot pieplot = (PiePlot) chart.getPlot();//获取饼图区域对象。
  pieplot.setLabelFont(new java.awt.Font("宋体",0,12));
  pieplot.setNoDataMessage("无数据显示"); //没有数据的时候显示的内容
  pieplot.setCircular(false);
  pieplot.setLabelGap(0.02D);
  TextTitle txtTitle = null;
  txtTitle = chart.getTitle();
  java.awt.Font font = new java.awt.Font("宋体", Font.BOLD, 16);
  txtTitle.setFont(font);//解决标题中文乱码
  chart.getLegend().setItemFont(font);
  chart.setBackgroundPaint(new Color(232,232,232));//设定背景
  pieplot.setBackgroundPaint(Color.white); //设定图表数据显示部分背景色
  */
   
  /***设置柱状图、折线图相关属性***/
   
  CategoryPlot catplot=chart.getCategoryPlot();  //获取柱状图、折线图区域对象。
  CategoryAxis domainAxis=catplot.getDomainAxis();
  catplot.setNoDataMessage("无数据显示");//没有数据的时候显示的内容
  //列表标题
  TextTitle txtTitle = null;
  txtTitle = chart.getTitle();
  txtTitle.setFont(new java.awt.Font("黑体",Font.BOLD,14));
  //水平底部列表
     domainAxis.setLabelFont(new java.awt.Font("黑体",Font.BOLD,14));
     //水平底部标题
     domainAxis.setTickLabelFont(new java.awt.Font("宋体",Font.BOLD,12));
     //垂直标题
     ValueAxis rangeAxis=catplot.getRangeAxis();//获取柱状
     rangeAxis.setLabelFont(new java.awt.Font("黑体",Font.BOLD,15));
     chart.getLegend().setItemFont(new java.awt.Font("黑体", Font.BOLD, 15));
     //获得renderer
     LineAndShapeRenderer lineAndShapeRenderer =(LineAndShapeRenderer)catplot.getRenderer();
     lineAndShapeRenderer.setShapesVisible(true); //series 点（即数据点）可见
     /*
     lineAndShapeRenderer.setSeriesStroke(0, new BasicStroke(2.0F, 1, 1, 1.0F, new float[] {
       10F, 6F
       }, 0.0F)); //这里是虚线，默认是直线
     */
  
      
   
  /***设置时序图相关属性***/
  /**
     XYPlot xyplot = (XYPlot) chart.getPlot();//获取时序图区域对象。
     //列表标题
  TextTitle txtTitle = null;
  txtTitle = chart.getTitle();
  txtTitle.setFont(new java.awt.Font("黑体",Font.BOLD,15));
     //纵轴字体
     xyplot.getRangeAxis().setLabelFont(new java.awt.Font("宋体", Font.BOLD, 12));
     //横轴框里的标题字体:显示图例
     //chart.getLegend().setItemFont(new java.awt.Font("宋体", Font.ITALIC, 12));
     //横轴列表字体
     xyplot.getDomainAxis().setTickLabelFont(new java.awt.Font("新宋体", 1, 12));
     //横轴小标题字体
     xyplot.getDomainAxis().setLabelFont(new java.awt.Font("新宋体", 1, 12));
     chart.setBackgroundPaint(new Color(252,175,134)); //设置背景色
     xyplot.setDomainGridlinesVisible(false);  //设置网格不显示
      
     //获取时间轴对象
     DateAxis dateAxis = (DateAxis) xyplot.getDomainAxis();
     //dateAxis.setLabelFont(new java.awt.Font("黑体", Font.ITALIC , 18));   //设置时间轴字体
     dateAxis.setLowerMargin(0.0);//设置时间轴上显示的最小值
     DateFormat format = new SimpleDateFormat("MM月份");   //创建日期格式对象
     //创建DateTickUnit对象
     DateTickUnit dtu = new DateTickUnit(DateTickUnitType.DAY,29,format);
     dateAxis.setTickUnit(dtu);//设置日期轴的日期标签
     **/
      
     //chart.getTitle().setFont(new java.awt.Font("宋体", Font.BOLD, 15));
     //chart.getLegend().setItemFont(new java.awt.Font("黑体", Font.BOLD, 15));
     //CategoryAxis domainAxis = plot.getDomainAxis();  
     /*------设置X轴坐标上的文字-----------*/
     //domainAxis.setTickLabelFont(new java.awt.Font("黑体", Font.PLAIN, 11));  
     /*------设置X轴的标题文字------------*/
     //domainAxis.setLabelFont(new java.awt.Font("宋体", Font.PLAIN, 12));  
     //NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();  
     /*------设置Y轴坐标上的文字-----------*/
     //numberaxis.setTickLabelFont(new java.awt.Font("黑体", Font.PLAIN, 12));  
     /*------设置Y轴的标题文字------------*/
     //numberaxis.setLabelFont(new java.awt.Font("黑体", Font.PLAIN, 12));
   
      
  FileOutputStream fos_jpg=null;
  try{
   fos_jpg=new FileOutputStream("D:\\ok_bing.jpg");
   /*
    * 第二个参数如果为100，会报异常：
    * java.lang.IllegalArgumentException: The 'quality' must be in the range 0.0f to 1.0f
    * 限制quality必须小于等于1,把100改成 0.1f。
    */
   ChartUtilities.writeChartAsJPEG(fos_jpg, 0.99f, chart, 600, 300, null);
    
    
  }catch(Exception e){
   System.out.println("[e]"+e);
  }finally{
   try{
    fos_jpg.close();
   }catch(Exception e){
     
   }
  } 
      
    }
   
 /**
  * 获取一个演示用的简单数据集对象
  * @return
  */
    //生成饼图数据
 private static DefaultPieDataset getDataSet() {
  DefaultPieDataset dataset = new DefaultPieDataset();
  dataset.setValue("苹果",100);
  dataset.setValue("梨子",200);
  dataset.setValue("葡萄",300);
  dataset.setValue("香蕉",400);
  dataset.setValue("荔枝",500);
  return dataset;
 }
 //生成柱状图数据
 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;
 }
   
 //生成折线图数据
  public static DefaultCategoryDataset createDataset() {
   DefaultCategoryDataset linedataset = new DefaultCategoryDataset();
   //  各曲线名称
   String series1 = "冰箱";
   String series2 = "彩电";
   String series3 = "洗衣机";
  
   //横轴名称(列名称)
   String type1 = "1月";
   String type2 = "2月";
   String type3 = "3月";
   String type4 = "4月";
   String type5 = "5月";
  
   linedataset.addValue(0.0, series1, type1);
   linedataset.addValue(4.2, series1, type2);
   linedataset.addValue(3.9, series1, type3);
   linedataset.addValue(3.2, series1, type4);
   linedataset.addValue(3.0, series1, type5);
  
   linedataset.addValue(1.0, series2, type1);
   linedataset.addValue(5.2, series2, type2);
   linedataset.addValue(7.9, series2, type3);
   linedataset.addValue(8.9, series2, type4);
   linedataset.addValue(9.2, series2, type5);
  
   linedataset.addValue(2.0, series3, type1);
   linedataset.addValue(9.2, series3, type2);
   linedataset.addValue(8.9, series3, type3);
   linedataset.addValue(9.9, series3, type4);
   linedataset.addValue(10.9, series3, type5);
  
   return linedataset;
  }
   
 //生成时序图数据
  public static XYDataset createtimedata() {
  //实例化TimeSeries对象
   TimeSeries timeseries = new TimeSeries("Data");
   Day day = new Day(1, 1, 2008);  //实例化Day
   double d = 3000D;//添加一年365天的数据
   for (int i = 0; i < 365; i++) {
    d = d + (Math.random() - 0.5) * 10; //创建随机数据
    timeseries.add(day, d); //向数据集合中添加数据
    day = (Day) day.next();
   }
   //创建TimeSeriesCollection集合对象
   TimeSeriesCollection timeSeriesCollection =new TimeSeriesCollection(timeseries);
   //返回数据集合对象
   return timeSeriesCollection;
  }
   
}