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JSP显示饼状图

2015-04-02 09:32 246 查看

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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