jsp JFreeChart统计报表分析柱状图

步骤1，下载jfreechart的jar（本人用的是1.0的）
步骤2，
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.awt.Color,
java.awt.Font,
org.jfree.chart.ChartFactory,
org.jfree.chart.JFreeChart,
org.jfree.chart.plot.PlotOrientation,
org.jfree.chart.servlet.ServletUtilities,
org.jfree.data.CategoryDataset,
org.jfree.data.DatasetUtilities,
org.jfree.chart.plot.CategoryPlot,
org.jfree.chart.axis.CategoryAxis,
org.jfree.chart.axis.ValueAxis,
org.jfree.chart.renderer.BarRenderer3D,
org.jfree.chart.labels.StandardCategoryItemLabelGenerator,
org.jfree.chart.axis.AxisLocation"%>
<%
double[][] data = new double[][] {
{672, 822, 223, 540, 126},
{325, 521, 210, 340, 1.02},
{332, 256, 523, 240, 526}
};
String[] rowKeys = {"苹果","梨子","葡萄"};
String[] columnKeys = {"北京","上海","广州","成都","深圳"};
CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data);
JFreeChart chart = ChartFactory.createBarChart3D("销量图统计","","",dataset,PlotOrientation.VERTICAL,true,false,false);
chart.setBackgroundPaint(Color.white);
CategoryPlot plot = chart.getCategoryPlot();
CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setVerticalCategoryLabels(false);
plot.setDomainAxis(domainAxis);
ValueAxis rangeAxis = plot.getRangeAxis();
//设置最高的一个 Item 与图片顶端的距离
rangeAxis.setUpperMargin(0.15);
//设置最低的一个 Item 与图片底端的距离
rangeAxis.setLowerMargin(0.15);
plot.setRangeAxis(rangeAxis);
BarRenderer3D renderer = new BarRenderer3D();
renderer.setBaseOutlinePaint(Color.blue);
//设置 Wall 的颜色<BR>
renderer.setWallPaint(Color.gray);
//设置每种水果代表的柱的颜色
renderer.setSeriesPaint(0, new Color(0, 0, 255));
renderer.setSeriesPaint(1, new Color(0, 100, 255));
renderer.setSeriesPaint(2, Color.GREEN);
//设置每个地区所包含的平行柱的之间距离
renderer.setItemMargin(0.1);
//显示每个柱的数值，并修改该数值的字体属性<BR>
renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setItemLabelsVisible(true);
plot.setRenderer(renderer);
//设置柱的透明度<BR>
plot.setForegroundAlpha(0.6f);
//设置地区、销量的显示位置<BR>
plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);
plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String graphURL =request.getContextPath()+"/servlet/DisplayChart?filename="+filename;
%>
<img src="<%=graphURL %>" width=500 height=300 border=0 usemap="#<%=filename%>">
步骤3，在你的web。xml中添加<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>
体验一下！