javabean求助

daishunchaoaiqiu 2011-02-27 10:06:36

有一个Bean.java类和DBConn.java类
在包com.liuyan.bean里面
在DBConn类中有这么个函数
public static ArrayList set() throws Exception{
Bean b=new Bean();
ArrayList a=new ArrayList();
ResultSet rs=getSql("select * from liuyan"); //这个函数已经写好连接rs了
while(rs.next())
{

b.setAuthor(rs.getString("author"));
b.setContent(rs.getString("content"));
b.setDate(rs.getString("time"));
a.add(b);
}
return a;
}
主页面中
<%

ArrayList a=new ArrayList();

a=DBConn.set(); //这段报错An error occurred at line: 37 in the jsp file: /index.jsp DBConn cannot be resolved

Bean b=new Bean();
Connection con=DBConn.getCon();
for(int i=0;i<a.size();i++)
{
b=(Bean)a.get(i);
out.println("<tr>");
out.println("<td>"+b.getAuthor()+"</td>");
out.println("<td>"+b.getContent()+"</td>");
out.println("<td>"+b.getDate()+"</td>");
out.println("</tr>");
}

%>

我自己写了个类能成功的，但是用在JSP页面里就出错怎么回事？
数据库驱动包导入的。

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zhoujingzhe 2011-02-28

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新手学习中围观

sbaiss 2011-02-27

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试一下楼上的方法，如果不行就重新部署一下项目，再不行就重建项目，我也遇过类似的问题，就是这样解决的，希望对你有帮助

thegodofwar 2011-02-27

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引入用逗号隔开不就可以了吗，不用那么多import

JavaAlpha 2011-02-27

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<%@page import="com.liuyan.bean.*" %>
这样写

JavaAlpha 2011-02-27

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别这样引入。要单独的分开引入。

daishunchaoaiqiu 2011-02-27

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<%@page contentType="text/html" pageEncoding="UTF-8" import="java.sql.*" import="java.util.*" import="com.liuyan.bean.*" %>
<!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=UTF-8">
<title>JSP Page</title>
</head>
<body>

<h2 align="center">留言板</h2>
<table>
<tr>
<td>
作者
</td>
<td>
留言
</td>
<td>
时间

</td>
</tr>
<%

ArrayList a=new ArrayList();
try{
a=DBConn.set();
}catch(Exception e){}
Bean b=new Bean();
Connection con=DBConn.getCon();
for(int i=0;i<a.size();i++)
{
b=(Bean)a.get(i);
out.println("<tr>");
out.println("<td>"+b.getAuthor()+"</td>");
out.println("<td>"+b.getContent()+"</td>");
out.println("<td>"+b.getDate()+"</td>");
out.println("</tr>");
}

%>
</table>

</body>
</html>

daishunchaoaiqiu 2011-02-27

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原来错误蛮多的。
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: 37 in the jsp file: /index.jsp
DBConn cannot be resolved
34:
35: ArrayList a=new ArrayList();
36: try{
37: a=DBConn.set();
38: }catch(Exception e){}
39: Bean b=new Bean();
40: Connection con=DBConn.getCon();

An error occurred at line: 39 in the jsp file: /index.jsp
Bean cannot be resolved to a type
36: try{
37: a=DBConn.set();
38: }catch(Exception e){}
39: Bean b=new Bean();
40: Connection con=DBConn.getCon();
41: for(int i=0;i<a.size();i++)
42: {

An error occurred at line: 39 in the jsp file: /index.jsp
Bean cannot be resolved to a type
36: try{
37: a=DBConn.set();
38: }catch(Exception e){}
39: Bean b=new Bean();
40: Connection con=DBConn.getCon();
41: for(int i=0;i<a.size();i++)
42: {

An error occurred at line: 40 in the jsp file: /index.jsp
DBConn cannot be resolved
37: a=DBConn.set();
38: }catch(Exception e){}
39: Bean b=new Bean();
40: Connection con=DBConn.getCon();
41: for(int i=0;i<a.size();i++)
42: {
43: b=(Bean)a.get(i);

An error occurred at line: 43 in the jsp file: /index.jsp
Bean cannot be resolved to a type
40: Connection con=DBConn.getCon();
41: for(int i=0;i<a.size();i++)
42: {
43: b=(Bean)a.get(i);
44: out.println("<tr>");
45: out.println("<td>"+b.getAuthor()+"</td>");
46: out.println("<td>"+b.getContent()+"</td>");

JavaAlpha 2011-02-27