Please help with jsp and database!!

Question

Hello,
i first created a jsp page and printed out the parameters of a user's username when they logged in. example, "Welcome user" and it worked fine...
i inserted a database into my site that validates the username and password, and ever since i did that in dreamweaver, when a user logs in sucessfully, it returns the jsp page like its supposed to, only that it says "Welcome null" instead of "Welcome John." pretty strange, huh!? can anyone please help? thanks!
here is the important part of the code to Login.jsp, and LoginSuccess.jsp: <%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" %>
<%@ include file="Connections/Login.jsp" %>
<%
// *** Validate request to log in to this site.
String MM_LoginAction = request.getRequestURI();
if (request.getQueryString() != null && request.getQueryString().length() > 0) MM_LoginAction += "?" + request.getQueryString();
String MM_valUsername=request.getParameter("Username");
if (MM_valUsername != null) {
  String MM_fldUserAuthorization="";
  String MM_redirectLoginSuccess="LoginSuccess.jsp";
  String MM_redirectLoginFailed="LoginFailure.jsp";
  String MM_redirectLogin=MM_redirectLoginFailed;
  Driver MM_driverUser = (Driver)Class.forName(MM_Login_DRIVER).newInstance();
  Connection MM_connUser = DriverManager.getConnection(MM_Login_STRING,MM_Login_USERNAME,MM_Login_PASSWORD);
  String MM_pSQL = "SELECT UserName, Password";
  if (!MM_fldUserAuthorization.equals("")) MM_pSQL += "," + MM_fldUserAuthorization;
  MM_pSQL += " FROM MemberInformation WHERE UserName=\'" + MM_valUsername.replace('\'', ' ') + "\' AND Password=\'" + request.getParameter("Password").toString().replace('\'', ' ') + "\'";
  PreparedStatement MM_statementUser = MM_connUser.prepareStatement(MM_pSQL);
  ResultSet MM_rsUser = MM_statementUser.executeQuery();
  boolean MM_rsUser_isNotEmpty = MM_rsUser.next();
  if (MM_rsUser_isNotEmpty) {
    // username and password match - this is a valid user
    session.putValue("MM_Username", MM_valUsername);
    if (!MM_fldUserAuthorization.equals("")) {
      session.putValue("MM_UserAuthorization", MM_rsUser.getString(MM_fldUserAuthorization).trim());
    } else {
      session.putValue("MM_UserAuthorization", "");
    if ((request.getParameter("accessdenied") != null) && false) {
      MM_redirectLoginSuccess = request.getParameter("accessdenied");
    MM_redirectLogin=MM_redirectLoginSuccess;
  MM_rsUser.close();
  MM_connUser.close();
  response.sendRedirect(response.encodeRedirectURL(MM_redirectLogin));
  return;
%>
      <form action="<%=MM_LoginAction%>" method="get" name="Login" id="Login">
        <table width="55%" border="0">
          <tr>
            <td width="41%">Username </td>
            <td width="59%"><input name="Username" type="text" id="Username" value="" size="25" maxlength="10"></td>
          </tr>
          <tr>
            <td>Password </td>
            <td><input name="Password" type="password" id="Password" value="" size="25" maxlength="10"></td>
          </tr>
          <tr>
            <td> </td>
            <td><input type="submit" name="Submit" value="Submit"></td>
          </tr>
        </table>
      </form>And LoginSuccess.jsp where i want it to print out the "Welcome username
         <%String Name=request.getParameter("Username");
     out.println ("Welcome ");
     out.println (Name); %>

Answer 1

<%@ page contentType="text/html; charset=iso-8859-1"
language="java" import="java.sql.*" %>
<%@ include file="Connections/Login.jsp" %>
<%
// *** Validate request to log in to this site.
String MM_LoginAction = request.getRequestURI();
if (request.getQueryString() != null &&
request.getQueryString().length() > 0) MM_LoginAction
+= "?" + request.getQueryString();
String
MM_valUsername=request.getParameter("Username");
if (MM_valUsername != null) {
String MM_fldUserAuthorization="";
String MM_redirectLoginSuccess="LoginSuccess.jsp";
String MM_redirectLoginFailed="LoginFailure.jsp";
String MM_redirectLogin=MM_redirectLoginFailed;
Driver MM_driverUser =
=
(Driver)Class.forName(MM_Login_DRIVER).newInstance();
Connection MM_connUser =
=
DriverManager.getConnection(MM_Login_STRING,MM_Login_US
RNAME,MM_Login_PASSWORD);
String MM_pSQL = "SELECT UserName, Password";
if (!MM_fldUserAuthorization.equals("")) MM_pSQL +=
= "," + MM_fldUserAuthorization;
MM_pSQL += " FROM MemberInformation WHERE
E UserName=\'" + MM_valUsername.replace('\'', ' ') +
"\' AND Password=\'" +
request.getParameter("Password").toString().replace('\'
, ' ') + "\'";
PreparedStatement MM_statementUser =
= MM_connUser.prepareStatement(MM_pSQL);
ResultSet MM_rsUser =
= MM_statementUser.executeQuery();
boolean MM_rsUser_isNotEmpty = MM_rsUser.next();
if (MM_rsUser_isNotEmpty) {
// username and password match - this is a valid
lid user
session.putValue("MM_Username", MM_valUsername);
if (!MM_fldUserAuthorization.equals("")) {
session.putValue("MM_UserAuthorization",
ion",
MM_rsUser.getString(MM_fldUserAuthorization).trim());
} else {
session.putValue("MM_UserAuthorization", "");
if ((request.getParameter("accessdenied") != null)
ll) && false) {
MM_redirectLoginSuccess =
ess = request.getParameter("accessdenied");
MM_redirectLogin=MM_redirectLoginSuccess;
MM_rsUser.close();
MM_connUser.close();
response.sendRedirect(response.encodeRedirectURL(MM_re
irectLogin));
return;
%>
<form action="<%=MM_LoginAction%>" method="get"
"get" name="Login" id="Login">
<table width="55%" border="0">
<tr>
<td width="41%">Username </td>
<td width="59%"><input name="Username"
="Username" type="text" id="Username" value=""
size="25" maxlength="10"></td>
</tr>
<tr>
<td>Password </td>
<td><input name="Password" type="password"
="password" id="Password" value="" size="25"
maxlength="10"></td>
</tr>
<tr>
<td>�</td>
<td><input type="submit" name="Submit"
me="Submit" value="Submit"></td>
</tr>
</table>
</form>
And LoginSuccess.jsp where i want it to print out the
"Welcome username
         <%String Name=request.getParameter("Username");
     out.println ("Welcome ");
     out.println (Name); %>When the page is rediredted u r not passing the user name in the query string,so it is not availble in the query string for LoginSuccess page
Since u have added user in session user this
<%String Name=(String)session.getValue("MM_Username") ;%>
<%     out.println ("Welcome ");
<%      out.println (Name); %>