DisplayChart org.jfree.chart.servlet.DisplayChart DisplayChart /DisplayChart
demo.jsp
<%@ page contentType="text/html;charset=GBK"%>
<%@ 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"%>
<%
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;
%>
