Jfreechar实例

最新推荐文章于 2014-05-04 13:13:14 发布

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#dataset #import #jfreechart #exception #null #string

本文介绍使用Java绘制柱状图和饼图的方法，通过具体示例展示如何创建图表数据集、生成图表并将其保存为图片文件。

柱状图:
基本包
import java.io.*;
import org.jfree.data.*;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;

简单图

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;

最后就可生成图表保存在D盘下:public static void main(String[] args) throws IOException{
              CategoryDataset dataset = getDataSet2();
       JFreeChart chart = ChartFactory.createBarChart3D("水果产量图","水果","产量",dataset,PlotOrientation.VERTICAL, true,false,false );
      FileOutputStream fos_jpg = null;
  try {
          fos_jpg = new FileOutputStream("D:/fruit.jpg");
  ChartUtilities.writeChartAsJPEG(fos_jpg,100,chart,400,300,null);
  } finally {
   try {
    fos_jpg.close();
   } catch (Exception e) {}
  }
}

Pie图:
首先我们导入程序中要用到的下列包
import java.io.*;
Import org.jfree.chart.*;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

然后我们要设置图片产生的数据集PieDataset :
private static PieDataset createDataset()
{
     DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
     defaultpiedataset.setValue("One", new Double(43.200000000000003D));
     defaultpiedataset.setValue("Two", new Double(10D));
     defaultpiedataset.setValue("Three", new Double(27.5D));
     defaultpiedataset.setValue("Four", new Double(17.5D));
     defaultpiedataset.setValue("Five", new Double(11D));
     defaultpiedataset.setValue("Six", new Double(19.399999999999999D));
     return defaultpiedataset;
}

最后就可生成图表保存在D盘下:public static void main(String[] args) throws IOException{
       JFreeChart chart = ChartFactory. createPieChart(“pie图实例", createDataset(),PlotOrientation.VERTICAL, true,false,false );
      FileOutputStream fos_jpg = null;
  try {
          fos_jpg = new FileOutputStream("D:/fruit.jpg");
  ChartUtilities.writeChartAsJPEG(fos_jpg,100,chart,400,300,null);
  } finally {
   try {
    fos_jpg.close();
   } catch (Exception e) {}
  }
}