使用 JFreeChart 来创建基于 web 的图表

JFreeChart 主页：
http://www.jfree.org/jfreechart/index.html
JFreeChart 下载页面：
http://sourceforge.net/projects/jfreechart/

java.lang.UnsatisfiedLinkError: initDDraw
at sun.awt.windows.Win32OffScreenSurfaceData.initDDraw(Native Method)
at sun.awt.windows.Win32OffScreenSurfaceData.<clinit>
(Win32OffScreenSurfaceData.java:141)
at sun.awt.Win32GraphicsDevice.<clinit>(Win32GraphicsDevice.java:58)
at sun.awt.Win32GraphicsEnvironment.makeScreenDevice(Win32GraphicsEnvironment.java:168)
at sun.java2d.SunGraphicsEnvironment.getScreenDevices(SunGraphicsEnvironment.java:240)
at sun.awt.Win32GraphicsEnvironment.getDefaultScreenDevice
(Win32GraphicsEnvironment.java:61)
at java.awt.Window.init(Window.java:224)
at java.awt.Window.<init>(Window.java:268)
at java.awt.Frame.<init>(Frame.java:398)
at javax.swing.JFrame.<init>(JFrame.java:198)
at org.jfree.chart.demo.JFreeChartDemo.<init>(JFreeChartDemo.java:148)
at org.jfree.chart.demo.JFreeChartDemo.main(JFreeChartDemo.java:285)
Exception in thread "main"

package lius.chart.demo;
import java.io.*;
import org.jfree.data.*;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;
/**
* 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) throws IOException{
CategoryDataset dataset = getDataSet2();
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
);

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) {}
}
}
/**
* 获取一个演示用的简单数据集对象
* @return
*/
private static CategoryDataset getDataSet() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(100, null, "苹果");
dataset.addValue(200, null, "梨子");
dataset.addValue(300, null, "葡萄");
dataset.addValue(400, null, "香蕉");
dataset.addValue(500, null, "荔枝");
return dataset;
}
/**
* 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;
}
}

package lius.chart.demo;
import java.io.*;
import org.jfree.data.*;
import org.jfree.chart.*;
/**
* 用于演示饼图的生成
* @author Winter Lau
*/
public class PieChartDemo {
public static void main(String[] args) throws IOException{
DefaultPieDataset data = getDataSet();
JFreeChart chart = ChartFactory.createPie3DChart("水果产量图",  // 图表标题
data,
true, // 是否显示图例
false,
false
);
// 写图表对象到文件，参照柱状图生成源码
}
/**
* 获取一个演示用的简单数据集对象
* @return
*/
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;
}
}

package lius.chart.demo;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import org.jfree.data.*;
import org.jfree.chart.*;
/**
* 演示通过 servlet 直接输出图表
* @author Winter Lau
*/
public class ChartDemoServlet extends HttpServlet {
public void service(ServletRequest req, ServletResponse res)
throws ServletException, IOException
{
res.setContentType("image/jpeg");
DefaultPieDataset data = getDataSet();
JFreeChart chart = ChartFactory.createPie3DChart("水果产量图",
data,
true,
false,
false
);

ChartUtilities.writeChartAsJPEG(res.getOutputStream(),
100,chart,400,300,null);
}
/**
* 获取一个演示用的简单数据集对象
* @return
*/
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;
}
}

<MAP NAME="chartMap">
<AREA SHAPE="RECT" COORDS="81,15,126,254" href="?series=0&category=100"
title="100 = 7,048"
onclick="javascript:clickChart('100');return false;">
<AREA SHAPE="RECT" COORDS="143,27,188,255" href="?series=0&category=200"
title="200 = 6,721"
onclick="javascript: clickChart ('200');return false;">
<AREA SHAPE="RECT" COORDS="205,54,250,255" href="?series=0&category=300"
title="300 = 5,929"
onclick="javascript: clickChart ('300');return false;">
<AREA SHAPE="RECT" COORDS="267,85,312,255" href="?series=0&category=400"
title="400 = 5,005"
onclick="javascript: clickChart ('400');return false;">
<AREA SHAPE="RECT" COORDS="329,17,374,255" href="?series=0&category=Diet"
title="Diet = 7,017" onclick="javascript:
clickChart ('Diet');return false;">
</MAP>

PrintWriter w = null;
FileOutputStream fos_jpg = null;
FileOutputStream fos_cri = null;
try{
// 根据不同类型的图表使用不同类，以下是针对饼图的操作
PiePlot plot = (PiePlot) chart.getPlot();
plot.setURLGenerator(new StandardPieURLGenerator(url));
// 设置工具提示
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
fos_jpg = new FileOutputStream(“d:\\fruit.jpg”);
ChartUtilities.writeChartAsJPEG(
fos_jpg,
100,
chart,
400,
300,
info);
fos_cri = new FileOutputStream(__d:\\fruit.map__);
w = new PrintWriter(fos_cri);
ChartUtilities.writeImageMap(w, __mapname__, info);
w.flush();
}finally{
try{
w.close();
}catch(Exception e){}
try{
fos_cri.close();
}catch(Exception e){}
try{
fos_jpg.close();
}catch(Exception e){}
}