?? jfreechart_pie.jsp
字號(hào):
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="org.jfree.data.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="org.jfree.data.general.*"%>
<%
//創(chuàng)建組合數(shù)據(jù)集對(duì)象
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("1班", 20);
dataset.setValue("2班", 29);
dataset.setValue("3班", 41);
dataset.setValue("4班", 32);
dataset.setValue("5班", 28);
//調(diào)用ChartFactory.createPieChart3D方法，使用之前建立的DefaultPieDataset對(duì)象創(chuàng)建一個(gè)JFreeChart對(duì)象
JFreeChart chart = ChartFactory.createPieChart3D("班級(jí)學(xué)生人數(shù)統(tǒng)計(jì)圖",dataset,true,false,false);
//如果最后一個(gè)參數(shù)值是null，那么產(chǎn)生的圖片是一次性的；如果參數(shù)值是session，則在整個(gè)會(huì)話期間有效
String sFilename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String sGraphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + sFilename;
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>使用JFreeChart組件繪制餅圖</title>
</head>
<body>
<div align="center">
<h1>使用JFreeChart組件繪制餅圖</h1>
<img src="<%= sGraphURL %>" width=500 height=300 border=0 >
</div>
</body>
</html>?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -