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Login screen with security levels

Login screen with security levels

Login screen with security levels

(OP)
Hello I am writing a login page and I am struggling a little.  I am trying to get the pages to redirect to the following screen depending on their levels.

Management is level 1;
redirect to managment.jsp

Administration staff is level 2   
redirect to staff

and Sales Assistants are level 3.  
redirect to assistant.jsp

Here is an example of the login screen.
String Login = request.getRequestURI();
if (request.getQueryString()!= null)
{
  String queryString = request.getQueryString();
}
String UserName=request.getParameter("username");
if (UserName != null) {
  String AdminLoginSuccess="admin/main.jsp";
  String LoginSuccess="feedback1.jsp";
  String LoginFailed="registration.jsp";
  String redirectLogin=LoginFailed;
  String stmt = "SELECT GROUPNUMBER, USERNAME, PASSWORD";
  stmt += " FROM REGISTRATION WHERE USERNAME=\'" + UserName.replace('\'', ' ') + "\' AND PASSWORD=\'" + request.getParameter("password").toString().replace('\'', ' ') + "\'";
  PreparedStatement stmtU = con.prepareStatement(stmt);
  ResultSet rs = stmtU.executeQuery();
  boolean rs_isNotEmpty = rs.next();
  if (rs_isNotEmpty) {

    session.setAttribute("Username", UserName);
    session.setAttribute("Accept", "");

     int admin = 3;

  if (admin <= rs.getInt("GROUPNUMBER"))
  {
   redirectLogin=LoginSuccess;
   }
    else
   {
   redirectLogin=AdminLoginSuccess;
   }

  }

  rs.close();
  con.close();
  response.sendRedirect(response.encodeRedirectURL(redirectLogin));
  return;
}
%>
<style type="text/css">
<!--
.style1 {color: #FF0000}
.style2 {font-size: 10px}
-->
</style>
<head>
<title>Login</title>
<script>

function Register() {

    if(document.Login.username.value=="")
    {
        alert('Enter your Username, please!');
        document.Login.username.focus();
        return false;
    }
        if(document.Login.password.value=="")
    {
        alert('Enter your Password, please!');
        document.Login.password.focus();
        return false;
    }
}

</script>
</head>
<body>
<center>
<form name="Login" id="Login" method="POST" onSubmit="return Register();" action="<%=Login%>">

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