利用JFreechart绘制复杂柱状图(二)
web.xml
<?xml version="1.0"?><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>/DisplayChart</url-pattern></servlet-mapping></web-app>
<%@ page contentType="text/html;charset=GBK"%><%@ pageimport="org.jfree.chart.ChartFactory,org.jfree.chart.JFreeChart,org.jfree.chart.plot.PlotOrientation,org.jfree.chart.servlet.ServletUtilities,org.jfree.data.category.CategoryDataset,org.jfree.data.general.DatasetUtilities"%><%double[][] data = new double[][] { { 1310, 1220, 1110, 1000 },{ 720, 700, 680, 640 }, { 1130, 1020, 980, 800 },{ 440, 400, 360, 300 } };String[] rowKeys = { "pig", "beef", "chicken", "fish" };String[] columnKeys = { "Guangzhou", "Shenzhen", "Dongguan","Foshan" };CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);JFreeChart chart = ChartFactory.createBarChart3D("JFreeChart Demo","type", "amount", dataset, PlotOrientation.VERTICAL, true,false, false);String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,null, session);String graphURL = request.getContextPath()+ "/DisplayChart?filename=" + filename;%><img src="<%=graphURL%>" width=500 height=300 border=0usemap="#<%= filename %>">