jsp JFreeChart统计报表分析柱状图

步骤1，下载jfreechart的jar，及相关jar包

步骤2，

<%@ page contentType="text/html;charset=UTF-8"%><%@ 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,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=0usemap="#<%=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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