First create the application.cfm file in your root folder,then write this code.
Application.cfm
<cfapplication name="cfcentral"
sessionmanagement="true"
sessiontimeout="#CreateTimeSpan(0,0,30,0)#"
/>
<cfset application.dsname="suman">
<cfset request.dsname="suman">
<cfset session.profile=StructNew()>
<cfif IsDefined("Form.logout")>
<cflogout>
</cfif>
<cflogin>
<cfif NOT IsDefined("cflogin")>
<cfinclude template="loginform.cfm">
<cfabort>
<cfelse>
<cfif cflogin.name IS "" OR cflogin.password IS "">
<cfoutput>
<h2>You must enter text in both the User Name and Password fields. </h2>
</cfoutput>
<cfinclude template="loginform.cfm">
<cfabort>
<cfelse>
<cfquery name="loginQuery" dataSource="#request.dsname#">
SELECT AdminName, Role
FROM admin
WHERE
AdminName = '#cflogin.name#'
AND Password = '#cflogin.password#'
</cfquery>
<cfif loginQuery.Role NEQ "">
<cfloginuser name="#cflogin.name#" Password = "#cflogin.password#"
roles="#loginQuery.Role#">
<cfelse>
<cfoutput>
<H2>Your login information is not valid.<br>
Please Try again</H2>
</cfoutput>
<cfinclude template="loginform.cfm">
<cfabort>
</cfif>
</cfif>
</cfif>
</cflogin>
<cfif GetAuthUser() NEQ "">
<cfoutput>
<form action="#CGI.script_name#?#CGI.query_string#" method="Post">
<input type="submit" Name="Logout" value="Logout">
</form>
</cfoutput>
</cfif>
Second create loginform.cfm file in your root folder.
loginform.cfm
Please Log In
<cfoutput>
<form name="LoginForm" action="#CGI.script_name#?#CGI.query_string#" method="Post">
<table>
<tr>
<td>username:</td>
<td><input type="text" name="j_userName"></td>
</tr>
<tr>
<td>password:</td>
<td><input type="password" name="j_password"></td>
</tr>
</table>
<br>
<input type="submit" value="Log In">
</form>
</cfoutput>
Craete a table name admin with AdminName,Password,Role field. WOW its done