Code for Login & LogOut Using JSP

login.jsp

<html>
<head>
<title>User Login</title>
</head>
<br>
<body Bgcolor ="#0099CC"><hr><hr>
<form method="POST" action="sessionAction.jsp">
<p><b>UserName:</b> <input type="text" name="UserName" size="10"></p>
<p><b>Password:</b>   <input type="Password" name="Password" size="10"></p>
<p><input type="submit" value="Submit" name="submit"><input type="reset" value="Reset" name="reset"></p>
</form>
</body>
</html>

sessionAction.jsp

<%@page import="java.util.*" %>
<script>
function go() {
window.location.replace("logout.jsp",'window','toolbar=1,location=1,directories=1,status=1,menubar=1,scrollbars=1,resizable=1');
self.close();
}
</script>
<%String str = request.getParameter("UserName");
session.setAttribute("UserName", request.getParameter("UserName"));%>
Welcome to <%= session.getAttribute( "UserName" ) %>
<% if (session.getAttribute("UserName").equals("")){%>
<a href="login.jsp"><b>Login </b></a>
<%}
else{%>
<a href="javascript:go()"><b>Logout</b></a>
<%}
%>

logout.jsp

<%@page import="java.util.*" %>
<%session.invalidate();%>
You have logged out. Plese
<a href="login.jsp">Login</a>

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