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我使用的數據庫MYSQL和JFreeChart的生成三維條形圖上的Java EE平臺開發一個簡單的應用，但3D效果是明顯的，但酒吧沒有看到使用的JFreeChart和myqql數據庫條形圖/餅圖顯示這樣的背景下，因此我無法在條形圖顯示酒吧，同樣是當我嘗試用餅圖來做到這一點。關於日食
這裏是礦代碼：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.io.*" %>
<%@ page import="java.sql.*" %>
<%@ page import="org.jfree.data.jdbc.JDBCCategoryDataset" %>
<%@ page import="org.jfree.chart.plot.PlotOrientation" %>
<%@ page import="org.jfree.chart.JFreeChart" %>
<%@ page import="org.jfree.chart.ChartUtilities" %>
<%@ page import="org.jfree.chart.ChartFactory" %>
<%
String connectionURL = "jdbc:mysql://localhost/tester?user=root&password=root&useUnicode=true&characterEncoding=utf-8";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection (connectionURL);
String query = "SELECT * from charter";
JDBCCategoryDataset dataset = new JDBCCategoryDataset(con);
dataset.executeQuery(query);
JFreeChart chart = ChartFactory.createBarChart3D("Test", "Name", "ID",dataset, PlotOrientation.VERTICAL, true, true, false);
try {
ChartUtilities.saveChartAsJPEG(new File("E:/project/jfreechart3D/img/barchart_3D.jpeg"),chart,400, 300);
}
catch (IOException e) {
System.out.println("No chart creation.");
}
%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<IMG SRC="E:/project/jfreechart3D/img/barchart_3D.jpeg" WIDTH="600" HEIGHT="400" BORDER="0" USEMAP="#chart" />
</body>
</html>