我编了一个jsp的登录界面，但是总是执行else的情况，查不出原因，请高手帮忙看一看。



<%@ page language="java" contentType="text/html;charset=gb2312" import="java.sql.*" %>
<html>
    <head>
        <title>登录通讯录</title>
    </head>

    <body>
        <center>
            <font size="5" color=red>登录通讯录</font>
        </center>
        

        <hr>
        

        <form method="post">
            <center>
                <p>用户名：<input type="text" name="Name"></p>
                <p>密&nbsp;&nbsp;码：<input type="password" name="Password"></p>
                <p><input type="submit" value="确定">&nbsp;&nbsp;<input type="reset" value="重置"></p>
            </center>
        </form>
    </body>
</html>
<%
    if(request.getParameter("Name")!=null &amp;&amp; request.getParameter("Password")!=null)
    {
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        Connection con=DriverManager.getConnection("jdbc:odbc:txl");//txl是odbc名称
        Statement smt=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
        String getpaperdata="SELECT * FROM login WHERE user='"+request.getParameter("Name")+"' AND pwd='"+request.getParameter("Password")+"'";
        ResultSet paperrs=smt.executeQuery(getpaperdata);
        if(paperrs.next())
        {
            response.sendRedirect("index.jsp");
        }
        else
            response.sendRedirect("error.htm");
    }
%>