如何在jfreechart柱状图中的每个柱子上显示数值的问题
小弟刚接触jfreechart,在网上找了个柱状图的列子，我用的是jfreechart1.05的。网上的列子太旧，小弟做了点修改，图出来了，就是每跟柱子上无法显示数值，不知道何缘故。代码如下：
<%@ page contentType= "text/html;charset=GBK "%>
<%@ page import= "java.awt.Color "%>
<%@ page import= "org.jfree.chart.ChartFactory "%>
<%@ page import= "org.jfree.chart.JFreeChart "%>
<%@ page import= "org.jfree.chart.plot.PlotOrientation "%>
<%@ page import= "org.jfree.chart.servlet.ServletUtilities "%>
<%@ page import= "org.jfree.data.category.CategoryDataset "%>
<%@ page import= "org.jfree.data.general.DatasetUtilities "%>
<%@ page import= "org.jfree.chart.plot.CategoryPlot "%>
<%@ page import= "org.jfree.chart.axis.CategoryAxis "%>
<%@ page import= "org.jfree.chart.axis.ValueAxis "%>
<%@ page import= "org.jfree.chart.renderer.category.BarRenderer3D "%>
<%@ page import= "org.jfree.chart.axis.AxisLocation "%>
<%
double[][] data = new double[][] {{672, 766, 223, 540, 126},{325, 521, 210, 340, 106},{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( "水果销量图统计 ",
null,
null,
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.BLACK);
renderer.setWallPaint(Color.gray);//设置 Wall 的颜色
//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);
renderer.setItemMargin(0.1);//设置每个地区所包含的平行柱的之间距离
renderer.setItemLabelsVisible(true);//显示每个柱的数值
plot.setRenderer(renderer);//让上面对柱子的设置生效
plot.setForegroundAlpha(0.6f);//设置柱的透明度
//设置地区、销量的显示位置
plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_LEFT);
plot.setRangeAxisLocation(AxisLocation.TOP_OR_LEFT);
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename= " + filename;
%>
<img src= " <%= graphURL %> " width=800 height=400 border=0 usemap= "# <%= filename %> ">
[解决办法]
我给你个建议
你把官方的demo反编译一下 大部分需要的效果都有
我做的时候就是参考的demo
现在身边没有代码 也没法找给你看
[解决办法]
micro1984，能不能告诉我如何反编译官方的demo的步骤啊？不胜感激，可以加我的qq474963853
或者msn: gnn853@hotmail.com
