📄 jmovingaverage.jsp
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<!--
Fig. 8.2_16: jMovingAverage.jsp
功能: JFreeChart实例16: 趋势图与移动平均线
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
import="java.awt.*"
import="java.text.*"
import="org.jfree.chart.*"
import="org.jfree.chart.axis.*"
import="org.jfree.chart.servlet.*"
import="org.jfree.chart.plot.*"
import="org.jfree.chart.renderer.*"
import="org.jfree.chart.axis.*"
import="org.jfree.chart.entity.*"
import="org.jfree.chart.labels.*"
import="org.jfree.chart.title.*"
import="org.jfree.chart.renderer.xy.*"
import="org.jfree.data.*"
import="org.jfree.data.xy.*"
import="org.jfree.data.time.*"
import="org.jfree.ui.*"
import="org.jfree.util.*"
%>
<%!
String chartTitle = "国际原油价格走势图";
// 创建数据集
public XYDataset createDataset()
{
TimeSeries tsc = new TimeSeries(chartTitle);
double value = 35;
Day day = new Day(1, 1, 2004);
for (int i = 0; i < 360; i++)
{
// 生成原油价格
double flag = Math.random();
if (flag > 0.5)
value += Math.random() * 1.5;
else
value -= Math.random() * 1.5;
tsc.add(day, value);
day = (Day) day.next();
}
TimeSeriesCollection dataset = new TimeSeriesCollection();
// 创建移动平均线数据集对象
TimeSeries mav = MovingAverage.createMovingAverage
(
tsc, "30天油价移动平均价", 30, 30
);
dataset.addSeries(tsc);
dataset.addSeries(mav);
return dataset;
}
public JFreeChart createChart(XYDataset dataset)
{
// 创建图表对象
JFreeChart chart = ChartFactory.createTimeSeriesChart
(
chartTitle, // 图表标题
"统计时间", // 坐标标题
"原油价格(单位:美元/桶)", // 坐标标题
dataset, // 定义绘制数据
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);
// 开始自定义图表绘制的相关属性
// 设置整个图表的背景颜色
GradientPaint bgGP = new GradientPaint(0, 0, Color.LIGHT_GRAY,
0, height, Color.WHITE, false);
chart.setBackgroundPaint(bgGP);
// 设置图表对象的绘制属性
XYPlot plot = chart.getXYPlot();
// 设置纵轴上的度量值(数字)的显示风格
NumberAxis rangeAxis = (NumberAxis)plot.getRangeAxis();
DecimalFormat priceFormat = new DecimalFormat("$###.00");
NumberTickUnit ntu = new NumberTickUnit(2.5, priceFormat);
rangeAxis.setTickUnit(ntu) ;
// 设置横轴上的时间刻度的显示格式
DateAxis domainAxis = new DateAxis("统计时段:2004年");
DateFormat df = new SimpleDateFormat("yyyy-MM");
DateTickUnit unit = new DateTickUnit(DateTickUnit.MONTH, 2, df);
domainAxis.setTickUnit(unit);
plot.setDomainAxis(domainAxis);
// 结束自定义图表绘制的相关属性
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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