救救小弟吧

AwaysOnline 2009-10-12 12:16:19

<%@ page contentType="text/html;charset=gb2312" language="java" %>
<%@ page import="java.sql.*" %>
<html>
<head> <title>用户名验证 </title> </head>
<%
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
//String strUser=request.getParameter("user");
//String strPass=request.getParameter("pass");
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String strConn="jdbc:odbc:data";
conn=DriverManager.getConnection(strConn);
stmt=conn.createStatement();
}
catch(Exception e)
{
out.println(e.toString());
}
String strSql="select ID,Password from table1 ";
rs=stmt.executeQuery(strSql);
while(rs.next())
{ %>
<%=rs.getString(1)%>
<%=rs.getString(2)%>
<% } %>
<%
rs.close();
stmt.close();
conn.close();
%>
</html>

运行的时候总是提示
type Exception report

message

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

exception

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
org.apache.jsp._4_jsp._jspService(_4_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.

到底怎么回事，我都改了好多次了。

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