📄 jfreechartbasicbar.jsp
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<!--
Fig. 8.2_01: JFreeChartBasicBar.jsp
功能: JFreeChart实例1: 垂直直方图
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
import="org.jfree.chart.ChartFactory"
import="org.jfree.chart.JFreeChart"
import="org.jfree.chart.plot.PlotOrientation"
import="org.jfree.data.category.DefaultCategoryDataset"
import="org.jfree.chart.servlet.ServletUtilities"
import="org.jfree.chart.ChartRenderingInfo"
import="org.jfree.chart.entity.StandardEntityCollection"
%>
<%
// 创建一个 500X375 的图像
int width=500, height=375;
String chartTitle = "JFreeChart实例1: 编程类图书周销售量垂直直方图";
String bookTitle[] = {"Python", "JAVA", "C#", "Perl", "PHP"};
String category[] = {"第1周", "第2周", "第3周", "第4周" };
// 创建数据集
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
// 往数据集中添加绘制图表所需的数据
int bookSales;
for (int i=0; i < bookTitle.length; i++)
{
for (int j=0; j < category.length; j++ )
{
bookSales = 1 + (int)(Math.random() * 100);
dataset.addValue(bookSales, bookTitle[i], category[j]);
}
}
// 创建图表
JFreeChart chart = ChartFactory.createBarChart
(
chartTitle, // 图表标题
"销售时间:2005年2月", // 坐标标题
"销售量", // 坐标标题
dataset, // 定义绘制数据
PlotOrientation.VERTICAL, // 直方图的方向
true, // 定义图表是否包含图例
true, // 定义图表是否包含提示
false // 定义图表是否包含URL
);
ChartRenderingInfo info =
new ChartRenderingInfo(new StandardEntityCollection());
// 设置图表的格式及文件名
String fileName =
ServletUtilities.saveChartAsPNG(chart, width, height, info, session);
// 设置图表浏览路径
String graphURL =
request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;
%>
<HTML>
<HEAD>
<TITLE><%=chartTitle%></TITLE>
</HEAD>
<BODY>
<P ALIGN="CENTER">
<img src="<%=graphURL %>" border="1" >
</P>
</BODY>
</HTML>
<%
/**************************************************************************
* (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓). *
* All Rights Reserved. *
* *
* DISCLAIMER: The authors of this code have used their *
* best efforts in preparing the code. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these codes. The authors *
* shall not be liable in any event for incidental or consequential *
* damages in connection with, or arising out of, the furnishing, *
* performance, or use of these programs. *
**************************************************************************/
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