Class.forName("com.mysql.jdbc.Driver");
resp.setContentType("Content-Text");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/railwaystation", "user", "password");
PreparedStatement ps = con.prepareStatement("SELECT * FROM пользователь WHERE login = ? and password = ?");
ps.setString(1, login);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();