JSP、SQL Server环境下编码关于rs的问题，怎么也看不明白
<%@ page language="java" import="java.util.*,java.sql.*,com.dao.*,com.en.*" pageEncoding="utf-8"%>
<%
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=Student";
String uid = "sa";
String pwd = "123456";
Connection conn = DriverManager.getConnection(url,uid,pwd);
PreparedStatement pstmt;
String name = request.getParameter("Name");
String pd = request.getParameter("Password");
String sqlTemp = "select * from Stu where name=" + name;
pstmt = conn.prepareStatement(sqlTemp);
ResultSet rs=pstmt.executeQuery(sqlTemp); //这两句
if(rs.next()==true)out.print("<script type='text/javascript'>alert('用户名已存在');window.location='home.jsp'</script>"); //
String sql = "insert into Stu(name,password) values (?,?)";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1,name);
pstmt.setString(2,pd);
pstmt.execute();
conn.commit();
pstmt.close();
conn.close();
out.print("<script type='text/javascript'>alert('添加成功');window.location='home.jsp'</script>");
%>
不加标识的两句运行没有什么问题，一加上就不对了（想做一个判断），没有语病啊，为什么，本人初学，请各位指教一下，万谢！数据库Student中Stu表有id，name，password三列，id主键自动增
错误提示：org.apache.jasper.JasperException: An exception occurred processing JSP page /add.jsp at line 17（标识的第一行）补充：String sqlTemp = "select * from Stu where name='" + name+"'";
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sqlTemp);
if (rs.next()) {out.print("<script type='text/javascript'>alert('名字已存在');window.location='userhome.jsp'</script>");return;}
这样好了，谢谢好心的人
