question27

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.annotation.*;
import javax.servlet.http.*;

@WebServlet("/usernameValidate")
public class question27 extends HttpServlet{

	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException {


		String username = req.getParameter("username");
		String password = req.getParameter("password");
		PrintWriter out = res.getWriter();
		out.write("<html><head><title>uservalidation</title></head>");
		if(username !="abc") {

			out.write("your typed username incorrectly. the correct username is abc");
		}else {
			out.write("your typed username correctly. the correct username is abc");
		}
		out.write("</html>");
	}

}


==================html=========================================

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Question 27</title>
</head>
<body>

<form action="usernameValidate" method="get">
username:<input type="text" name="username" >
password:<input type="password" name="password">
<input name="submit" type="submit">
</form>
</body>
</html>