📄 jwave.jsp
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<!--
Fig. 8.2_12: jWave.jsp
功能: JFreeChart实例12: 正弦曲线
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
import="java.awt.*"
import="org.jfree.chart.*"
import="org.jfree.chart.servlet.*"
import="org.jfree.chart.plot.*"
import="org.jfree.chart.entity.*"
import="org.jfree.chart.title.*"
import="org.jfree.data.*"
import="org.jfree.data.general.*"
import="org.jfree.data.category.*"
import="org.jfree.data.xy.*"
%>
<%!
String chartTitle = "JFreeChart实例12: 正弦曲线";
// 创建数据集
public XYDataset createDataset()
{
XYSeries series = new XYSeries(chartTitle);
for (int i = 0; i <= 20; i++)
{
series.add(i, Math.sin((i / Math.PI)));
}
XYSeriesCollection dataset = new XYSeriesCollection(series);
return dataset;
}
public JFreeChart createChart(XYDataset dataset)
{
// 创建图表对象
JFreeChart chart = ChartFactory.createXYLineChart
(
chartTitle, // 图表标题
"", // 坐标标题
"正弦值", // 坐标标题
dataset, // 定义绘制数据
PlotOrientation.VERTICAL, // 线段图方向
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
);
return chart;
}
%>
<%
// 创建一个 500X375 的图像
int width=500, height=375;
XYDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
// 设置图表的背景颜色
chart.setBackgroundPaint(new Color(205, 241, 197));
// 自定义图表的标题的字体和颜色
TextTitle title = chart.getTitle();
title.setFont(new Font("汉真广标", Font.BOLD, 25));
ChartRenderingInfo info =
new ChartRenderingInfo(new StandardEntityCollection());
// 设置图片生成格式
String fileName =
ServletUtilities.saveChartAsPNG(chart, width, height, info, session);
// 设置图片生成路径
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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