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<html>
  <body>
    <form method="post" action="login.jsp">
      Username:
      <br></br>
      <input type="text" name="username" size="20"></input>
      <br></br>
      Password:
      <br></br>
      <input type="password" name="password" size="20"></input>
      <br></br>
      <input type="submit"></input>
    </form>
  </body>
</html>

<jsp:useBean id="usercontrol" class="usercontrol.Login" scope="session"/>
<jsp:setProperty name="usercontrol" property="*"/>
<html>
  <body>
    <center>
      <% if(false.equals(usercontrol.incorrect())) {
    out.println("Welcome");
    } else {
    out.println("Incorrect login");
    session.invalidate();
    }
    %>
      <br></br>
      <a href="/">Back</a>
    </center>
  </body>
</html>

package usercontrol;

import java.util.Scanner;

import java.io.*;

public class Login {
    String username;
    String password;
    boolean incorrect = true;

    public void checkUsername(String input) {
        username = input;
    }

    public void checkPassword(String input) {
        password = input;
        login();
    }

    void login() {
        try {
            Scanner login = new Scanner(new File(username + ".swwf"));
            if (password.equals(login.nextLine())) {
                incorrect = false;
            } else {
                incorrect = true;
            }
            login.close();
        } catch (FileNotFoundException fnf) {
            incorrect = true;
        }
    }

    public boolean incorrect() {
        return incorrect;
    }
}