b.jsp

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<%@ page contentType="text/html;charset=GBK"%>
<%@page import = " java.io.FileNotFoundException " %> 
<%@page import = " java.io.FileOutputStream " %> 
<%@page import = " org.apache.commons.logging.Log " %> 
<%@page import = " java.io.IOException " %> 

<%@page import = " org.apache.commons.logging.LogFactory " %> 
<%@page import = " org.jfree.chart.ChartFactory " %> 
<%@page import = " org.jfree.chart.ChartUtilities " %> 
<%@page import = " org.jfree.chart.JFreeChart " %> 
<%@page import = " org.jfree.chart.plot.PlotOrientation " %> 
<%@page import = " org.jfree.data.category.CategoryDataset " %> 
<%@page import = " org.jfree.data.category.DefaultCategoryDataset " %> 

<%@page import = " java.awt.Color " %> 
<%@page import = " org.jfree.chart.renderer.category.BarRenderer3D " %> 
<%@page import = " org.jfree.chart.labels.StandardCategoryItemLabelGenerator " %> 
<%@page import = " org.jfree.chart.axis.CategoryAxis " %> 
<%@page import = " org.jfree.chart.plot.CategoryPlot " %> 

<% 
DefaultCategoryDataset dataset        =      new     DefaultCategoryDataset();
dataset.addValue( 150 ,     " A " ,     " 苹果 " );
dataset.addValue( 530 ,     " B " ,     " 苹果 " );
dataset.addValue( 160 ,     " C " ,     " 苹果 " );
dataset.addValue( 160 ,     " D " ,     " 苹果 " );
dataset.addValue( 160 ,     " E " ,     " 苹果 " );
//dataset.addValue( 120 ,     " 北京 " ,     " 梨子 " );
//dataset.addValue( 230 ,     " 上海 " ,     " 梨子 " );
//dataset.addValue( 360 ,     " 广州 " ,     " 梨子 " );
//dataset.addValue( 600 ,     " 北京 " ,     " 葡萄 " );
//dataset.addValue( 430 ,     " 上海 " ,     " 葡萄 " );
//dataset.addValue( 560 ,     " 广州 " ,     " 葡萄 " );
//dataset.addValue( 400 ,     " 北京 " ,     " 香蕉 " );
//dataset.addValue( 530 ,     " 上海 " ,     " 香蕉 " );
//dataset.addValue( 660 ,     " 广州 " ,     " 香蕉 " );
//dataset.addValue( 500 ,     " 北京 " ,     " 荔枝 " );
//dataset.addValue( 630 ,     " 上海 " ,     " 荔枝 " );
//dataset.addValue( 430 ,     " 广州 " ,     " 荔枝 " );
//dataset.addValue( 500 ,     " 北京 " ,     " 柑橘 " );
//dataset.addValue( 630 ,     " 上海 " ,     " 柑橘 " );
//dataset.addValue( 430 ,     " 广州 " ,     " 柑橘 " );

JFreeChart chart     =     ChartFactory.createBarChart3D( " 水果销量图统计-By Alpha " , " 水果种类-http://www.blogjava.net/Alpha/ " , " 销量 " ,dataset,PlotOrientation.VERTICAL, true , false , false );
chart.setBackgroundPaint(Color.WHITE);
CategoryPlot plot     =     chart.getCategoryPlot();

CategoryAxis domainAxis     =     plot.getDomainAxis();
// domainAxis.setVerticalCategoryLabels( false );
plot.setDomainAxis(domainAxis);

BarRenderer3D renderer     =      new     BarRenderer3D();
renderer.setBaseOutlinePaint(Color.BLACK);

// 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
renderer.setItemLabelGenerator( new     StandardCategoryItemLabelGenerator());
renderer.setItemLabelsVisible( true );
plot.setRenderer(renderer);

//设置柱的透明度
plot.setForegroundAlpha( 0.8f);
ChartUtilities.writeChartAsJPEG(response.getOutputStream(),chart, 640 , 400 );
%>