利用JFreechart绘制复杂柱状图(三)
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,org.jfree.chart.plot.*,org.jfree.chart.labels.*,org.jfree.chart.renderer.category.BarRenderer3D,java.awt.*,org.jfree.ui.*,org.jfree.chart.axis.AxisLocation"%><%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, true,false);CategoryPlot plot = chart.getCategoryPlot();//设置网格背景颜色plot.setBackgroundPaint(Color.white);//设置网格竖线颜色plot.setDomainGridlinePaint(Color.pink);//设置网格横线颜色plot.setRangeGridlinePaint(Color.pink);//显示每个柱的数值，并修改该数值的字体属性BarRenderer3D renderer = new BarRenderer3D();renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());renderer.setBaseItemLabelsVisible(true);//默认的数字显示在柱子中，通过如下两句可调整数字的显示//注意：此句很关键，若无此句，那数字的显示会被覆盖，给人数字没有显示出来的问题renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));renderer.setItemLabelAnchorOffset(10D);//设置每个地区所包含的平行柱的之间距离//renderer.setItemMargin(0.3);plot.setRenderer(renderer);//设置地区、销量的显示位置//将下方的“肉类”放到上方plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);//将默认放在左边的“销量”放到右方plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);String filename = ServletUtilities.saveChartAsPNG(chart, 700, 400,null, session);String graphURL = request.getContextPath()+ "/DisplayChart?filename=" + filename;%><img src="<%=graphURL%>" width=700 height=400 border=0usemap="#<%= filename %>">