jsp中表单reg.jsp提交后的验证并将数据插入数据库的页面regok.jsp总是通不过是咋回事

<%@ page contentType="text/html;charset=gb2312" %><%@ include file="conn.jsp"%><%@ page import="java.sql.*"%><%! String face,nick,code,code1,sex,email,qq;%><%    //从注册页面获得用户注册信息    String nich= request.getParameter("nich");    String mima= request.getParameter("mima");    String sex= request.getParameter("sex");    String email= request.getParameter("email");    String qq=request.getParameter("qq");    String truename=request.getParameter("truename");    String sidclass=request.getParameter("sidclass");    String cardnum=request.getParameter("cardnum");    String edudegree=request.getParameter("edudegree");    String nationality=request.getParameter("nationality");    String intro=request.getParameter("intro");                        String sqlUser = "select * from user  where name='" +nich+"'";            rs.next();            if(rs != null){                response.sendRedirect("reg.jsp?msg=用户已经存在,请重新选择用户名进行注册!");            }else{                //新用户记录                Statement stmt_ADD=conn.createStatement();                String Sql="insert into user(nich,mima,truename,sidclass,"                            + "cardnum,sex,edudegree,"                            + "nationality,email,qq,"                            + "intro) values ('" + nich + "','"                            + mima+"','"+ truename+"','"+sidclass+"','"+cardnum+"','"                            + sex+"','"+edudegree+"','"                            + nationality                            + "','" + email + "','" + qq + "','"                            + intro+"')";                int add1=stmt_ADD.executeUpdate(Sql);                if (add1>0){                    System.out.print("用户：["+ nich +"] 注册成功");                    session.setAttribute("loginuser",nich);                    response.sendRedirect("index.jsp");                }else {                System.out.print("注册失败，请重新注册！");                response.sendRedirect("reg.jsp");                }                        stmt_ADD.close();            }     stmt.close() ; %>