步骤1，下载jfreechart的jar，及相关jar包

步骤2，

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ page
	import="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,org.jfree.chart.title.TextTitle,org.jfree.chart.axis.CategoryAxis,org.jfree.chart.axis.NumberAxis"%>

<%
	double[][] data = new double[][] { { 1310, 1220, 1110, 1000 },
			{ 720, 700, 680, 640 }, { 1130, 1020, 980, 800 },
			{ 440, 400, 360, 300 } };
	String[] rowKeys = { "猪肉", "牛肉", "鸡肉", "鱼肉" };
	String[] columnKeys = { "广州", "深圳", "东莞", "佛山" };
	CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
			rowKeys, columnKeys, data);
	JFreeChart chart = ChartFactory.createBarChart3D("", "肉类", "销量",
			dataset, PlotOrientation.VERTICAL, true, true, false);
	CategoryPlot plot = chart.getCategoryPlot();
	//设置字体，不然会中文乱码的
	Font font = new Font("宋体", Font.BOLD, 16);
	TextTitle title = new TextTitle("肉类销量统计图", font);
	//副标题 
	TextTitle subtitle = new TextTitle("副标题", new Font("黑体", Font.BOLD,
			12));
	chart.addSubtitle(subtitle);
	chart.setTitle(title); //标题
	NumberAxis numberaxis = (NumberAxis) plot.getRangeAxis();
	CategoryAxis domainAxis = plot.getDomainAxis();
	/*------设置X轴坐标上的文字-----------*/
	domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));
	/*------设置X轴的标题文字------------*/
	domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));
	/*------设置Y轴坐标上的文字-----------*/
	numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));
	/*------设置Y轴的标题文字------------*/
	numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));
	/*------这句代码解决了底部汉字乱码的问题-----------*/
	chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));
	//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);
	renderer.setItemLabelFont(new Font("宋体", Font.PLAIN, 12));
	renderer.setItemLabelsVisible(true);
	//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()
			+ "/servlet/DisplayChart?filename=" + filename;
%>

<img src="<%=graphURL%>" width=700 height=400 border=0
	usemap="#<%=filename%>">

?步骤3，在你的web.xml中添加如下代码：

<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>

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