piedemo2.jsp

自己写的jfreechart demo

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="org.jfree.chart.*,
                 org.jfree.chart.servlet.ServletUtilities,
                 org.jfree.util.Rotation,
                 org.jfree.data.general.DefaultPieDataset,
                 org.jfree.chart.plot.PiePlot3D"%>
<%@ page import="org.jfree.chart.title.*" %>
<%@ page import="java.awt.*"%>
               
<%
//设置数据集
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("初中高级程序员", 0.55);
dataset.setValue("项目经理", 0.1);
dataset.setValue("系统分析师", 0.1);
dataset.setValue("软件架构师", 0.1);
dataset.setValue("其他", 0.2);
 
//通过工厂类生成JFreeChart对象
JFreeChart chart = ChartFactory.createPieChart3D("IT行业职业分布图", dataset, true, true, false);

//标题字体
Font font = new Font("SimSun", 10, 20); 
TextTitle textTitle = chart.getTitle();
textTitle.setFont(font);
textTitle.setPaint(Color.BLUE);


//获得3D的水晶饼图对象
PiePlot3D pieplot3d = (PiePlot3D) chart.getPlot();
//设置开始角度
pieplot3d.setStartAngle(150D);
//设置方向为”顺时针方向“
pieplot3d.setDirection(Rotation.CLOCKWISE);
//设置透明度，0.5F为半透明，1为不透明，0为全透明
pieplot3d.setForegroundAlpha(0.5F);
pieplot3d.setNoDataMessage("无数据显示");

pieplot3d.setLabelFont(new Font("宋体", 0, 12));
       
//联想细节
LegendTitle legend = chart.getLegend();
legend.setItemFont(new Font("宋体", Font.PLAIN, 15));
legend.setItemPaint(Color.BLUE);

       
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 %>">