为什么这个jfreechart在输出的时候只有个上面的“网站访问统计表”，而没有里面的具体数据？

lilieyu 2010-04-20 02:44:01

<%@ page language="java" contentType="text/html; charset=GBK"

    pageEncoding="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.urls.StandardPieURLGenerator"%>

<%@ page import="org.jfree.chart.entity.StandardEntityCollection"%> 

<%@ page import="java.io.*"%>

<%@ page import="org.jfree.chart.labels.*"%>



<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<title>Insert title here</title>

</head>

<body>

<%

DefaultPieDataset   data   =   new   DefaultPieDataset();   

data.setValue("六月",500);   

data.setValue("七月",580);   

data.setValue("八月",828);     

  

PiePlot   plot   = new PiePlot();  

   

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("www.SenTom.net   网站访问统计表");//可选，设置图片标题   



//plot.setToolTipGenerator(new StandardPieItemLabelGenerator()); 

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 

//chart.setTitle("titi");

 //w=new PrintWriter("D:\\ 项目状态分布.jpg"); 

 //String filename = ServletUtilities.saveChartAsPNG(chart,500,300,session);

String   filename   =   ServletUtilities.saveChartAsPNG(chart,   500,   300,   info,   session);   

chart.setTitle("fff");

ChartUtilities.writeImageMap(w, "map0", info, false); 

///ChartUtilities.writeChartAsJPEG(w,100,chart,640,480,null); 



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>

是JSP代码，使用eclipse.

...全文

51 3 打赏收藏转发到动态举报

写回复

用AI写文章

3 条回复

切换为时间正序

请发表友善的回复…

发表回复

lilieyu 2010-04-20

打赏
举报

我看出来了，是忘记写data了。

PiePlot   plot   = new PiePlot();

谢谢啊！

hxbr110 2010-04-20

打赏
举报

在web.xml文件里配置
<servlet>
<servlet-name>DisplayChart</servlet-name>
<servlet-class>
org.jfree.chart.servlet.DisplayChart
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DisplayChart</servlet-name>
<url-pattern>/servlet/DisplayChart</url-pattern>
</servlet-mapping>

hxbr110 2010-04-20