Login Server test

//jsp login.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script>
function validate(){
    var vUser = trim(document.frm.usr.value);
    var vPwd = trim(document.frm.pwd.value);

    if(vUser == ""){
        alert("Username field is empty!");
        document.frm.usr.focus();
        return false;
    }else if(vPwd == ""){
        alert("Password field is empty!");
        document.frm.pwd.focus();
        return false;
    }
}

function trim(s){

    return s.replace( /^s*/, "" ).replace( /s*$/, "");
}
</script>
</head>
<body>
<form method="GET" action="login" name="frm" onSubmit="return validate();">
  Username:<input type="text" name="usr"><br>
  Password:<input type="password" name="pwd"><br>
  <input type="submit" name="goTo" value="Login"/>
</form>
</body>
</html>


//LoginServlet.java (Servlet)
package no.uia.login;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

        String usr = request.getParameter("usr");
        String pwd = request.getParameter("pwd");

        RequestDispatcher rd = null;

        rd = request.getRequestDispatcher("test.jsp");
        rd.forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}


//test.jsp (Saves password as a session-variable)
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
String usr = request.getParameter("usr");
String pwd = request.getParameter("pwd");
session.setAttribute("innlogget",pwd);
%>
<%=usr %>, du klarte det!
<p><a href="resultat.jsp">Klikk her for å vise ditt hemmelige passord</a>)</p>
</body>
</html>


//resultat.jsp (Shows the session-variable (The password))
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
String pwd=(String)session.getAttribute("innlogget");
if(pwd==null){
    pwd="Passord ikke oppgitt";
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Innlogget</title>
</head>
<body>
<p>Ditt hemmelige passord er: <%=pwd %></p>
</body>
</html>