<p>CreateUser.java:
package saar.etisalat.dao;</p>

<p>import java.io.*;</p>

<p>import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;</p>

<p>import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;</p>

<p>import saar.etisalat.Conn;</p>

<p>public class CreateUser extends HttpServlet {</p>

<pre class="prettyprint">/**
 * 
 */
private static final long serialVersionUID = 1L;

/**
 * Constructor of the object.
 */
public CreateUser() {
    super();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    Connection connection = null;
    PreparedStatement preparedStatement = null;
    CallableStatement callableStatement = null;
    ResultSet resultSet = null;
    ResultSet resultSet1 = null;
    connection = Conn.openConnection();
    String userName = request.getParameter("name");
    String fullName = request.getParameter("fullname");
    String password = request.getParameter("pass");
    String roleid = request.getParameter("sel");
    HttpSession session = request.getSession();
    String sessionUserName = (String) session.getAttribute("sessionUser");
    String userId = null;
    String query = null;
    String dbusername = null;
    try {
        preparedStatement = connection
                .prepareStatement("select user_name from user_details where user_name=?");
        preparedStatement.setString(1, userName);
        System.out.println(userName);
        resultSet = preparedStatement.executeQuery();
        while (resultSet.next()) {
            dbusername = resultSet.getString("user_name");
            System.out.println(dbusername);
        }
        if (dbusername == null) {
            System.out.println("in if");
            query = "{call user_create(?,?,?,?,?,?,0)}";
            callableStatement = connection.prepareCall(query);
            callableStatement.setString(1, userName);
            callableStatement.setString(2, fullName);
            callableStatement.setString(3, roleid);
            callableStatement.setString(4, password);
            callableStatement.setString(5, sessionUserName);
            callableStatement.setString(6, sessionUserName);
            resultSet1 = callableStatement.executeQuery();

            session.setAttribute("name", userName);

            if (session.getAttribute("name") != null) {
                response.sendRedirect("CreateUser.jsp");
            }
        } else if (resultSet != null) {
            System.out.println("in else");
            session.setAttribute("resultSetuser", resultSet);
            if (session.getAttribute("resultSetuser") != null) {
                response.sendRedirect("CreateUser.jsp");
            }
        }

    } catch (SQLException sqlException) {
        sqlException.printStackTrace();
    } finally {
        Conn.closeConnection(resultSet, callableStatement, connection);
    }
}
</code></pre>

<p>}</p>

<p>CreateUser.jsp:
&lt;%@ page language="java"
    import="java.util.<em>,saar.etisalat.</em>,java.sql.*,saar.etisalat.Conn"
    pageEncoding="ISO-8859-1"%>
&lt;%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
    String name=request.getParameter("name");
%></p>

<p>&lt;%!
    Connection connection = null;
    PreparedStatement preparedStatement = null,preparedStatement1 =null; 
    ResultSet resultSet = null,resultSet1=null;%></p>

<pre class="prettyprint">&lt;%  connection=Conn.openConnection();
    try{
    preparedStatement = connection
            .prepareStatement("select distinct role_name ,role_id  from role order by role_name");
    resultSet = preparedStatement.executeQuery();
</code></pre>

<p> %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Etisalat Login Page</title>
    <meta name="Keywords" content="" />
    <meta name="Description" content="" />
    <link href="styles/styles.css" type="text/css" rel="stylesheet"/>
   <script type="text/javascript">
  function valid()
  {</p>

<pre class="prettyprint">if (document.f1.name.value== "")
{
alert("fill the username");
f1.name.value="";
 f1.name.focus();
 return false;
}


if (document.f1.fullname.value== "")
</code></pre>

<p>{
    alert("Enter fullname");
    f1.fullname.focus();
     return false;
}</p>

<p>   if(document.f1.pass.value=="")
{
     alert("fill the password field");
     f1.pass.focus();
     return false;
}
   if(document.f1.pass.value!=document.f1.cpass.value)
{
      alert("password didnt match");
       f1.pass.focus();
      return false;
}</p>

<p> if ( document.f1.sel.selectedIndex == 0 ) {
  alert ( "Please select role" );
   return false; 
   } </p>

<pre class="prettyprint">return true;
</code></pre>

<p>}</p>

<p>function focuson(){
          document.f1.name.focus();
     }</p>

<p>   </script>
    </head>
        <body class="bodyColor" onload="focuson();"></p>

<pre class="prettyprint">    &lt;p&gt;&lt;table style="margin-top : 100px" align="center" border=0&gt;
        &lt;form name="f1" action="CreateUser" method="post" onsubmit="return valid();"&gt;
          &lt;%if(session.getAttribute("name")!=null)
</code></pre>

<p>{%><td colspan=4>
  &lt;B style="color:teal">User Successfully Created</B></td> &lt;% 
      session.removeAttribute("name");
} %> <br />
&lt;%if(session.getAttribute("resultSetuser")!=null)
{%><td colspan=4>
   &lt;B style="color:red">username already exists select different name</B></td>
        &lt;%   session.removeAttribute("resultSetuser");
} %> <br />
 <div>
   <table border="0" style="width: 96%; border-collapse: collapse"
                    cellpadding="0" align="center">
                    <tr>
                        <td colspan="3">
                            &nbsp;
                        </td>
                    </tr>
                    <tr>
                        <td class="CC1L"></td>
                        <td class="CC1M">
                            CREATE USER
                        </td>
                        <td class="CC1R"></td>
                    </tr>
                    <tr>
                        <td class="PageBodyL"></td>
                        <td class="PageBodyM">
                            <table>
                                <tr>
                                    <td>
                                            <tr></tr>
                                             <tr></tr>
                                             <tr></tr>
                                             <tr></tr></p>

<pre class="prettyprint">                              &lt;tr&gt;
                    &lt;td class="PageBodyL"&gt;&lt;/td&gt;

                    &lt;p&gt;&amp;nbsp;&lt;/p&gt;
                    &lt;p&gt;&amp;nbsp;&lt;/p&gt;

                    &lt;/td&gt;

                &lt;/tr&gt;
                                    &lt;tr&gt;&lt;tr&gt;&lt;td&gt;&lt;/td&gt;&lt;/tr&gt;&lt;table border=0 align="center"&gt;
                                         &lt;tr&gt;&lt;td align="left" colspan=2&gt;User Name&lt;/td&gt;&lt;td&gt;&lt;/td&gt;
            &lt;td align="left"&gt;&lt;input type="text" size=30 class="textbox" name="name" /&gt;&lt;/td&gt;
            &lt;tr&gt;&lt;td align="left" colspan=2&gt;Full Name&lt;/td&gt;&lt;td&gt;&lt;/td&gt;
                &lt;td align="left"&gt;&lt;input type="text" size=30 class="textbox" name="fullname" /&gt;&lt;/td&gt;&lt;/tr&gt;
            &lt;tr&gt;&lt;td align="left" colspan=2&gt;Password&lt;/td&gt;&lt;td&gt;&lt;/td&gt;
                &lt;td align="left"&gt;&lt;input type="password" size=30 class="textbox" name="pass" /&gt;&lt;/td&gt;&lt;tr&gt;
            &lt;tr&gt;&lt;td colspan=2 align="left"&gt;Confirm Password&lt;/td&gt;&lt;td&gt;&lt;/td&gt;
                &lt;td align="left"&gt;&lt;input type="password" size=30 class="textbox" name="cpass" /&gt;&lt;/td&gt;&lt;/tr&gt;
            &lt;tr&gt;&lt;td align="left" colspan=2&gt;Role&lt;/td&gt;&lt;td&gt;&lt;/td&gt;
                &lt;td align="left"&gt;&lt;select name="sel" class="dropbox"&gt;
                    &lt;option&gt; -Select- &lt;/option&gt;
                    &lt;%
                        while (resultSet.next()) {
                                String roles = resultSet.getString("role_name");
                                String roleid = resultSet.getString("role_id");
                    %&gt;
                    &lt;option value=&lt;%=roleid%&gt; size=30&gt;&lt;%=roles%&gt;&lt;/option&gt;
                    &lt;%
                        }
                        } catch (SQLException se) {
                            se.printStackTrace();
                        } finally {
                            Conn.closeConnection(resultSet, preparedStatement, connection);
                        }
                    %&gt;
                &lt;/select&gt;&lt;/td&gt;&lt;/tr&gt;
                                    &lt;/tr&gt;
                        &lt;td&gt;&lt;/td&gt;

                            &lt;table border=0 align="center"&gt;
                                &lt;tr&gt;
                                    &lt;td&gt;
                                        &lt;input type=submit class="butn" value=Save /&gt;

                                        &lt;input type=reset class="butn" value=Reset /&gt;
                                    &lt;/td&gt;
                                &lt;/tr&gt;
                                &lt;/td&gt;
                                &lt;/tr&gt;
                            &lt;/table&gt;
                    &lt;/td&gt;
                    &lt;td class="PageBodyR"&gt;&lt;/td&gt;
                &lt;/tr&gt;
                &lt;tr&gt;
                    &lt;td class="PageBodyL"&gt;&lt;/td&gt;
                    &lt;td class="PageBodyM"&gt;
                    &lt;p&gt;&amp;nbsp;&lt;/p&gt;
                    &lt;p&gt;&amp;nbsp;&lt;/p&gt;
                    &lt;/td&gt;
                    &lt;td class="PageBodyR"&gt;&lt;/td&gt;
                &lt;/tr&gt;
                &lt;tr&gt;
                    &lt;td class="PageBottomL"&gt;&lt;/td&gt;
                    &lt;td class="PageBottomM"&gt;
                        ©SaaR. All rights reserved
                    &lt;/td&gt;
                    &lt;td class="PageBottomR"&gt;&lt;/td&gt;
                &lt;/tr&gt;
            &lt;/table&gt;&lt;/table&gt;

        &lt;/div&gt;
    &lt;/form&gt;
&lt;/body&gt;
</code></pre>

<p></html></p>

<p>Here is the code for user already exists...Smilarly check it for the email._ in this is shown as &amp;#95</p>