JSP显示饼状图

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index.jsp

<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="org.jfree.data.general.DefaultPieDataset"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>
<%@ page import="org.jfree.chart.labels.StandardPieToolTipGenerator"%>
<%@ page import="org.jfree.chart.urls.StandardPieURLGenerator"%>
<%@ page import="org.jfree.chart.entity.StandardEntityCollection"%>
<%@ page import="java.io.*"%>

<HTML>
<HEAD>
<META http-equiv=Content-Type content="text/html; charset=utf-8">
<META NAME="Author" CONTENT="Alpha">
<TITLE>江津天气情况</TITLE>
</HEAD>
<BODY>
<%
            DefaultPieDataset data = new DefaultPieDataset();
   //数据初始化
            data.setValue("晴天",1380);
            data.setValue("雨天",1620);
            data.setValue("阴天",6100);
            data.setValue("多云",400);
            data.setValue("雾霾",500);

            //HttpSession session = request.getSession();

            PiePlot3D plot = new PiePlot3D(data);//生成一个3D饼图
            //plot.setURLGenerator(new StandardPieURLGenerator("DegreedView.jsp"));//设定图片链接
            JFreeChart chart = new JFreeChart("",JFreeChart.DEFAULT_TITLE_FONT, plot, true);
            chart.setBackgroundPaint(java.awt.Color.white);//可选，设置图片背景色
            chart.setTitle("江津天气情况");//可选，设置图片标题
            plot.setToolTipGenerator(new StandardPieToolTipGenerator());
            StandardEntityCollection sec = new StandardEntityCollection();
            ChartRenderingInfo info = new ChartRenderingInfo(sec);
            PrintWriter w = new PrintWriter(out);//输出MAP信息
            //500是图片长度，300是图片高度
            //String filename = ServletUtilities.saveChartAsPNG(chart,500,300,info,session);
   String filename = ServletUtilities.saveChartAsJPEG(chart,500,300,info,session);
            ChartUtilities.writeImageMap(w,"map0",info,false);

String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
%>

<P ALIGN="CENTER">
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#map0">
</P>
</BODY>
</HTML>

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