sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Text?>


<AnchorPane fx:controller="sample.Controller" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="406.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1">
   <children>
      <ImageView fitHeight="400.0" fitWidth="420.0" layoutX="1.0" layoutY="1.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@chaman.png" />
         </image>
      </ImageView>
      <TextField fx:id="username" layoutX="158.0" layoutY="136.0" />
      <TextField fx:id="password" layoutX="158.0" layoutY="176.0" />
      <Text layoutX="99.0" layoutY="153.0" strokeType="OUTSIDE" strokeWidth="0.0" text="username" />
      <Text layoutX="99.0" layoutY="193.0" strokeType="OUTSIDE" strokeWidth="0.0" text="password" />
      <Button layoutX="147.0" layoutY="247.0" mnemonicParsing="false" onAction="#onlogin" text="Login" />
      <Button layoutX="203.0" layoutY="247.0" mnemonicParsing="false" onAction="#onlogup" text="logup" />
   </children>
</AnchorPane>