TimeSeriesDemo.java
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.TimeSeriesDataItem;
import org.jfree.data.xy.XYDataset;
/**
* @author neitbe
*/
public class TimeSeriesDemo
{
//private static Log log = LogFactory.getLog(TimeSeriesDemo.class);
//曲線圖標題
private String title = "趨勢分析";
//曲線圖X軸提示
private String domain = "月份走勢";
//曲線圖Y軸提示
private String range = "應收餘額";
//曲線圖自標題
private String subtitleStr = "2005財年分析";
//創建時間數據源
//每一個TimeSeries在圖上是一條曲線
private TimeSeries yongyou = new TimeSeries("用友");
private TimeSeries jindie = new TimeSeries("金碟");
private TimeSeries dongruan = new TimeSeries("東軟");
//時間曲線數據集合
private static TimeSeriesCollection dataset = new TimeSeriesCollection();
private void setDataset()
{
dataset.removeAllSeries(); //在javaBean中使用此類這個很重要,不然會不停的加入新的TimeSeries;
dataset.addSeries(this.yongyou);
dataset.addSeries(this.jindie);
dataset.addSeries(this.dongruan);
}
private void setDongruan()
{
this.dongruan.clear(); //很重要,不然會報錯
/**
* 報錯
* org.apache.jasper.JasperException: You are attempting to add an observation for the time period
* 這裏是在類屬性裏聲明TimeSeries纔用到的
*/
for(int i = 1999; i < 2005; i++)
{
for(int mon = 0; mon < 12; mon++)
{
this.dongruan.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(300 - Math.random()*100)));
}
}
}
private void setJindie()
{
this.jindie.clear(); //很重要,不然會報錯
for(int i = 1999; i < 2005; i++)
{
for(int mon = 0; mon < 12; mon++)
{
this.jindie.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(400 - Math.random()*100)));
}
}
}
private void setYongyou()
{
this.yongyou.clear(); //很重要,不然會報錯
for(int i = 1999; i < 2005; i++)
{
for(int mon = 0; mon < 12; mon++)
{
this.yongyou.add(new TimeSeriesDataItem(new Day(1,mon+1,i),new Double(500 - Math.random()*100)));
}
}
}
private TimeSeriesCollection getDataset()
{
this.setDongruan();
this.setJindie();
this.setYongyou();
this.setDataset();
return dataset;
}
public String drawPic(HttpSession session)
{
String fileName = null;
JFreeChart chart = ChartFactory.createTimeSeriesChart(title,domain,range,getDataset(),true,true,false);
TextTitle subTitle = new TextTitle(subtitleStr,new Font("黑體",Font.BOLD,12));
chart.addSubtitle(subTitle);
chart.setTitle(new TextTitle(title,new Font("隸書",Font.ITALIC,15)));
chart.setBorderPaint(new GradientPaint(0,0,Color.white,0,1000,Color.blue));
//String fileName = "D:\\fuit2.jpeg";
try
{
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
//log.debug("準備創建圖片……");
fileName = ServletUtilities.saveChartAsJPEG(chart,600,600,info,session);
//log.debug("圖片創建成功!");
} catch (IOException e)
{
//log.error("IO異常:",e);
}
//log.debug("返回的文件名爲:" + fileName);
return fileName;
}
public static void main(String[] args)
{
// TimeSeriesDemo timeSeriesDemo = new TimeSeriesDemo();
// System.out.println(timeSeriesDemo.drawPic(null));
}
}
---------------------------------------------------------------------------------------------------------------------------
TimeSeriesDemo.jsp
<%@ page language="java" contentType="text/html; charset=UTF8" pageEncoding="UTF8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<jsp:useBean id="timeSeries" scope="session" class="jfreechart.TimeSeriesDemo"/>
</head>
<body>
<%
String fileName = timeSeries.drawPic(request.getSession());
String graphURL = request.getContextPath()+"/servlet/DisplayChart?filename=" + fileName;
%>
<img src="<%= graphURL %>" width="900" height="300" border="1"/>
</body>
</html>
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web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee
"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd
">
<servlet>
<servlet-name>DisplayChart</servlet-name>
<servlet-class>org.jfree.chart.servlet.DisplayChart</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping>
</web-app>