用Tomcat调试jsp程序出现如下:“cannot be resolved” ,请高手帮帮忙阿,急
运行时出现下面的提示:An error occurred at line: 16 in the jsp file: /webchapter63/servlet/message.jsp
The method executeQuery(String) is undefined for the type DBconn
13: </tr>
14: <%
15: String sqli="SELECT * FROM mas ORDER BY 留言 id DESC";
16: ResultSet rs=con.executeQuery(sqli);
17: String color="";
18: String strpages=(String)request.getParameter("pages");
19: int pages=0;
An error occurred at line: 52 in the jsp file: /webchapter63/servlet/message.jsp
username cannot be resolved
49: %>
50: <tr bgcolor="<%=color%>">
51: <td align="center" width="86" height="22"><div align="left">留言人:</div></td>
52: <td align="center" width="158"><%=username%> </td>
53: <td height="22" colspan="2" align="left">留言主题;</td>
54: <td width="298" height="22" align="center"><%=topic%> </td>
55: </tr>
An error occurred at line: 54 in the jsp file: /webchapter63/servlet/message.jsp
topic cannot be resolved
51: <td align="center" width="86" height="22"><div align="left">留言人:</div></td>
52: <td align="center" width="158"><%=username%> </td>
53: <td height="22" colspan="2" align="left">留言主题;</td>
54: <td width="298" height="22" align="center"><%=topic%> </td>
55: </tr>
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期:</div></td>
An error occurred at line: 58 in the jsp file: /webchapter63/servlet/message.jsp
time cannot be resolved
55: </tr>
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期:</div></td>
58: <td width="158" height="22" align="center"><%=time%></td>
59: <td height="22" colspan="3" rowspan="3" align="left" valign="top"><%=masinfo%> </td>
60: </tr>
61: <tr bgcolor="<%=color%>">
An error occurred at line: 59 in the jsp file: /webchapter63/servlet/message.jsp
masinfo cannot be resolved
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期:</div></td>
58: <td width="158" height="22" align="center"><%=time%></td>
59: <td height="22" colspan="3" rowspan="3" align="left" valign="top"><%=masinfo%> </td>
60: </tr>
61: <tr bgcolor="<%=color%>">
62: <td height="22" align="center"><div align="left">Email; </div></td>
An error occurred at line: 63 in the jsp file: /webchapter63/servlet/message.jsp
email cannot be resolved
60: </tr>
61: <tr bgcolor="<%=color%>">
62: <td height="22" align="center"><div align="left">Email; </div></td>
63: <td height="22" align="center"><%=email%> </td>
64: </tr>
65: <tr bgcolor="<%=color%>">
66: <td height="22" align="center"><div align="left">处理: </div></td>
An error occurred at line: 67 in the jsp file: /webchapter63/servlet/message.jsp
id cannot be resolved
64: </tr>
65: <tr bgcolor="<%=color%>">
66: <td height="22" align="center"><div align="left">处理: </div></td>
67: <td height="22" align="center"><a href="webchapter63/servlet/delMessage?id=<%=id%>">删除留言</a></td>
68: <%
69: i++;
70: if(i==sqan)break;
An error occurred at line: 71 in the jsp file: /webchapter63/servlet/message.jsp
Syntax error, insert "Finally" to complete TryStatement
68: <%
69: i++;
70: if(i==sqan)break;
71: }
72: try{
73: con.close();
74: }
An error occurred at line: 73 in the jsp file: /webchapter63/servlet/message.jsp
con cannot be resolved
70: if(i==sqan)break;
71: }
72: try{
73: con.close();
74: }
75: catch(Exception e){
76: }
An error occurred at line: 80 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
77: %>
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页 <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a> <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
An error occurred at line: 80 in the jsp file: /webchapter63/servlet/message.jsp
countpage cannot be resolved
77: %>
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页 <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a> <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
An error occurred at line: 81 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页 <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a> <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
84: </tr>
An error occurred at line: 83 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页 <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a> <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
84: </tr>
85: </table>
86: </body>
An error occurred at line: 181 in the generated java file
Syntax error on token "catch", Identifier expected
An error occurred at line: 183 in the generated java file
out cannot be resolved
An error occurred at line: 183 in the generated java file
_jspx_out cannot be resolved
An error occurred at line: 184 in the generated java file
out cannot be resolved
An error occurred at line: 184 in the generated java file
out cannot be resolved
An error occurred at line: 185 in the generated java file
out cannot be resolved
An error occurred at line: 186 in the generated java file
_jspx_page_context cannot be resolved
An error occurred at line: 186 in the generated java file
_jspx_page_context cannot be resolved
An error occurred at line: 188 in the generated java file
Syntax error on token "finally", { expected
An error occurred at line: 189 in the generated java file
_jspx_page_context cannot be resolved
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:316)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)