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分享一个学习jfreechart中遇到的问题
今天想用jfreechart在网页中插入一张图片,然后在网上找了一个例子先看看,出现了这样的问题,
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:6: 找不到符号
符号： 类 PieChart
位置： 软件包 org.jfree.chart.demo
import org.jfree.chart.demo.PieChart;
^
An error occurred at line: 9 in the jsp file: /pieChart.jsp
Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:54: 找不到符号
符号： 类 PieChart
位置： 类 org.apache.jsp.pieChart_jsp
PieChart pie = new PieChart();
^
An error occurred at line: 9 in the jsp file: /pieChart.jsp
Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:54: 找不到符号
符号： 类 PieChart
位置： 类 org.apache.jsp.pieChart_jsp
PieChart pie = new PieChart();
请问,是包没有导好么?
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:6: 找不到符号
符号： 类 PieChart
位置： 软件包 org.jfree.chart.demo
import org.jfree.chart.demo.PieChart;
^
An error occurred at line: 9 in the jsp file: /pieChart.jsp
Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:54: 找不到符号
符号： 类 PieChart
位置： 类 org.apache.jsp.pieChart_jsp
PieChart pie = new PieChart();
^
An error occurred at line: 9 in the jsp file: /pieChart.jsp
Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\test\org\apache\jsp\pieChart_jsp.java:54: 找不到符号
符号： 类 PieChart
位置： 类 org.apache.jsp.pieChart_jsp
PieChart pie = new PieChart();
请问,是包没有导好么?
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rainv 2007-07-16
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superjava_2006 2007-07-15
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软件包 org.jfree.chart.demo这个包应该是你找的例子的作者自己写的，你看看源代码中有没有这个PieChart类。有的话就很可能是包没有导好。
aofeimx 2007-07-15
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在classes目录下有两个class文件ConnDb.class和PieChart.class.谢谢大家了!
aofeimx 2007-07-15
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具体JSP代码如下,
<%@ page import="org.jfree.chart.demo.PieChart"%>
<%@ page import = "java.io.PrintWriter" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<HTML>
<HEAD>
<TITLE>pieChart</TITLE>
</HEAD>
<BODY>
<%
PieChart pie = new PieChart();
String filename = pie.generatePieChart(request,session,new PrintWriter(out));
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;%>
<P ALIGN="CENTER">
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>">
</P>
</BODY>
</HTML>
<%@ page import="org.jfree.chart.demo.PieChart"%>
<%@ page import = "java.io.PrintWriter" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<HTML>
<HEAD>
<TITLE>pieChart</TITLE>
</HEAD>
<BODY>
<%
PieChart pie = new PieChart();
String filename = pie.generatePieChart(request,session,new PrintWriter(out));
String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;%>
<P ALIGN="CENTER">
<img src="<%= graphURL %>" width=500 height=300 border=0 usemap="#<%= filename %>">
</P>
</BODY>
</HTML>
