有关jfreechart 图片在jsp页面显示的问题（急）

源代码是这样的<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><%@ page import="org.jfree.data.general.DefaultPieDataset,org.jfree.chart.ChartFactory,java.awt.Font,org.jfree.chart.plot.PiePlot,org.jfree.chart.servlet.ServletUtilities
" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'jfreechart.jsp' starting page</title>
    
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->  </head>
  
  <body>
   
 <%
  DefaultPieDataset dpd = new DefaultPieDataset();

dpd.setValue("市场人员", 20);
dpd.setValue("开发人员", 10);
dpd.setValue("财务人员", 5);
dpd.setValue("其他", 20);


org.jfree.chart.JFreeChart jfc = ChartFactory.createPieChart3D("某公司人员结构图", dpd, true,true,false);

jfc.getTitle().setFont(new Font("宋体",Font.ITALIC,12));


PiePlot piePlot = (PiePlot)jfc.getPlot();


piePlot.setLabelFont(new Font("宋体",Font.ITALIC,12));

jfc.getLegend().setItemFont(new Font("黑体",Font.BOLD,12));  

String filename = ServletUtilities.saveChartAsPNG(jfc, 700, 500,null, session);

String graphURL = request.getContextPath()+ "/DisplayChart?filename=" + filename;
%><img src="<%=graphURL%>" width="700" height="500" border="0" usemap="#<%= filename %>">
 
  </body>
</html>
可是在页面中总是显示不了，显示的是叉号、求各位大虾帮忙~

解决方案 »

  1.   

    src="<%= graphURL%>" 这样试试  
      

  2.   

    web.xml配好了吗？
    <servlet-mapping>
        <servlet-name>DisplayChart</servlet-name>
        <url-pattern>/servlet/DisplayChart</url-pattern>
    </servlet-mapping>
      

  3.   


                    /**保存图片*/
    String filename = ServletUtilities.saveChartAsPNG(chart, 600, 350,info, session);
    /**输出图片*/
    ChartUtilities.writeImageMap(w, filename, info, false);你还没没有输出图片
      

  4.   

    你在叉上点右键，然后点属性，把那个URL地址拷贝出来，单独运行。看看IE中报什么错。
      

  5.   


    PrintWriter w = new PrintWriter(printWriter);
    /**保存图片*/
    String filename = ServletUtilities.saveChartAsPNG(chart, 600, 350,info, session);
    /**输出图片*/
    ChartUtilities.writeImageMap(w, filename, info, false);没有输出
      

  6.   

    我直接运行后There is no Action mapped for namespace / and action name DisplayChart. - [unknown location]
    at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:178)
    at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
    at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
    at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:478)
    at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Unknown Source)错误，当然web.xml已经配置了Displaychart类
      

  7.   

    我直接运行你的页面。正常显示。你web.xml是怎么配置的？
      

  8.   

    这个是我的web.xml
    部分配置 <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
     </filter-mapping>
     
     <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>/DisplayChart</url-pattern>
     </servlet-mapping>jar包肯定在lib目录下啊~