为什么 javabean使用的时候说 package doesn't exist

2010-10-01 08:38:31 225 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 8 in the jsp file: /untitled.jsp

Generated servlet error:
[javac] Compiling 1 source file

D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\testWeb_Project\org\apache\jsp\untitled_jsp.java:48: package reg does not exist
reg.dbconn query = null;
^

An error occurred at line: 8 in the jsp file: /untitled.jsp

Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\testWeb_Project\org\apache\jsp\untitled_jsp.java:50: package reg does not exist
query = (reg.dbconn) pageContext.getAttribute("query", PageContext.PAGE_SCOPE);
^

An error occurred at line: 8 in the jsp file: /untitled.jsp

Generated servlet error:
D:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\testWeb_Project\org\apache\jsp\untitled_jsp.java:52: package reg does not exist
query = new reg.dbconn();
^
3 errors

org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:552)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

以下是简单的测试代码，因为其他页面太复杂，但使用的是同样的使用javabean的方法，
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<jsp:useBean id="query" scope="page" class="reg.dbconn" />
<body>
<%
query.setConnection("root","root");
ResultSet rs = query.getResult("select * from topic");
String str = null;
while(rs.next()){
str = rs.getString(2);
}
query.destroy();
%>
<div>
<%= str%>
</div>
</body>
</html>

因为白天一直在移动文件夹，所以才造成了重大的问题

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