bar3.jsp

JFreeChart开发全攻略,JFreeChart开发全攻略

<%@ 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"%>
<%
double[][] data = new double[][] {{1310, 1220, 1110, 1000},
	{720, 700, 680, 640},
	{1130, 1020, 980, 800},
	{440, 400, 360, 300}};
String[] rowKeys = {"白菜", "生菜","西洋菜", "豆芽菜"};
String[] columnKeys = {"长沙", "湘潭", "衡阳", "岳阳"};
CategoryDataset dataset = DatasetUtilities.createCategoryDataset(rowKeys, columnKeys, data); 

JFreeChart chart = ChartFactory.createBarChart3D("蔬菜销量统计图", 
                  "蔬菜",
                  "销量",
                  dataset,
                  PlotOrientation.VERTICAL,
                  true,
                  false,
                  false);
		
String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width="500" height="300" border="0" usemap="#<%= filename %>">