JFreeChart在JSP中实现饼状图显示X。帮忙解决下。在线等
<%@ page contentType ="text/html;charset=UTF-8" %>
<%@ page import="org.jfree.chart.*,
org.jfree.chart.plot.PiePlot,
org.jfree.data.general.DefaultPieDataset,
org.jfree.chart.servlet.ServletUtilities,
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,false,false);
PiePlot pieplot = (PiePlot)chart.getPlot();
pieplot.setLabelFont(new Font("宋体",0,12));
//没有数据的时候显示的内容
pieplot.setNoDataMessage("无数据显示");
pieplot.setCircular(false);
pieplot.setLabelGap(0.02D);
String filename = ServletUtilities.saveChartAsPNG(chart,500,300,null,session);
String graphURL = request.getContextPath() + "servlet/DisplayChart?filename ="+filename;%>
<img
src=" <%=graphURL %> " width=500 height=300 border=0 usemap="# <%=filename%>">
