Posted on 2008-09-01 00:39
橡皮人 閱讀(143)
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這里就JFreeChart寫一個小小的餅圖DEMO，其中的數據是從數據庫中取出來的，所有代碼有些比較。。。大家需要的改改就可以了。首先寫餅圖之前要先引入二個Jar文件：jfreechart-1.0.10.jar和jcommon-1.0.13.jar
Code如下：
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="org.jfree.chart.labels.StandardPieToolTipGenerator"%>
<%@ page import="org.jfree.chart.urls.StandardPieURLGenerator"%>
<%@ page import="org.jfree.chart.entity.StandardEntityCollection"%>
<%@ page import="java.io.*"%>
<%@ page import="com.csthit.store.dao.*" %>
<%@ page import="com.csthit.store.vo.*" %>
<html>
<head>
<%
TypeDAO typedao=new TypeDAO();
SalesDAO sales=null;
FatherType father=null;
List list=null;
list=typedao.getFatherType();
%>
<title>銷售圖</title>
<%
DefaultPieDataset data = new DefaultPieDataset();
//數據動態初始化
for(int i=0;i<list.size();i++) {
sales=new SalesDAO();
father=(FatherType)list.get(i);
data.setValue(father.getType(),sales.queryQuantityByType(father.getType())); //設值
}
PiePlot3D plot = new PiePlot3D(data);//生成一個3D餅圖
JFreeChart chart = new JFreeChart("",JFreeChart.DEFAULT_TITLE_FONT, plot, true);
chart.setBackgroundPaint(java.awt.Color.lightGray);//可選，設置圖片背景色
chart.setTitle("圖書銷量統計圖");//可選，設置圖片標題
plot.setToolTipGenerator(new StandardPieToolTipGenerator());
StandardEntityCollection sec = new StandardEntityCollection();
ChartRenderingInfo info = new ChartRenderingInfo(sec);
PrintWriter w = new PrintWriter(out);//輸出MAP信息
//500是圖片長度，300是圖片高度
String filename = ServletUtilities.saveChartAsJPEG(chart,500,300,info,session);
ChartUtilities.writeImageMap(w,"map0",info,false);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
%>
</head>
<body>
<center>
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#map0">
</center>
</body>
</html>
XML配置如下：
<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>
效果顯示如下：
各位晚安～