Question

在场景构建器中，我有一个带有fx：id passwordBox的密码字段，并且在相应的控制器类中我有

@FXML private static PasswordField passwordBox = new PasswordField（）;

我还试过

@FXML private static PasswordField passwordBox;

当我运行程序时，密码字段中的字母是纯文本。当我在场景构建器中预览窗口时，会发生同样的事情。密码字段是一个PasswordField，所以我没有把它误认为是TextField。

我该怎么办？

编辑： FXML文件

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

<?import java.lang.*?>
<?import java.net.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.*?>

<AnchorPane fx:id="mainAnchor" opacity="1.0" prefHeight="200.0" prefWidth="408.0000999999975" styleClass="back" xmlns:fx="http://javafx.com/fxml" fx:controller="application.MainController">
  <!-- TODO Add Nodes -->
  <children>
    <Label fx:id="serverIPLbl" layoutX="14.0" layoutY="28.0" prefWidth="175.0" text="Server IP">
      <font>
        <Font name="Segoe UI" size="12.0" fx:id="x1" />
      </font>
    </Label>
    <TextField fx:id="serverIPBox" layoutX="14.0" layoutY="50.0" prefWidth="175.0" />
    <Label fx:id="portLbl" font="$x1" layoutX="215.0" layoutY="28.0" prefWidth="175.0" text="Port" />
    <TextField fx:id="portBox" layoutX="215.0" layoutY="50.0" prefWidth="175.0" />
    <Label fx:id="passwordLbl" font="$x1" layoutX="14.0" layoutY="81.0" prefWidth="175.0" text="Server Password" />
    <ImageView fx:id="settingsButton" fitHeight="23.0" fitWidth="23.0" layoutX="14.0" layoutY="137.0" onMouseClicked="#settingsClicked" pickOnBounds="true" preserveRatio="true">
      <image>
        <Image url="@../images/gear.png" />
      </image>
    </ImageView>
    <Button id="startServer" fx:id="connectButton" layoutX="14.0" layoutY="167.0" mnemonicParsing="false" onAction="#connectClicked" prefHeight="22.0" prefWidth="376.0" text="Connect" />
    <Label fx:id="usernameLbl" font="$x1" layoutX="215.0" layoutY="81.0" prefWidth="175.0" text="Username" />
    <TextField id="serverIPBox" fx:id="usernameBox" layoutX="215.0" layoutY="103.0" prefWidth="175.0" promptText="a-z A-Z 0-9 _ - chars allowed" />
    <ImageView id="favoriteButton" fx:id="favoritesButton" fitHeight="23.0" fitWidth="23.0" layoutX="55.0" layoutY="137.0" onMouseClicked="#favoritesClicked" pickOnBounds="true" preserveRatio="true">
      <image>
        <Image url="@../images/favorite.png" />
      </image>
    </ImageView>
    <PasswordField fx:id="passwordBox" layoutX="14.0" layoutY="103.0" prefWidth="175.0" promptText="Optional" />
  </children>
  <stylesheets>
    <URL value="@style.css" />
  </stylesheets>
</AnchorPane>

Answer 1

您的代码问题

@FXML是控制器实例的注入注释，您不应将其与static成员或使用new关键字初始化的成员一起使用。

而控制器中的定义应该是：

@FXML private PasswordField passwordBox;

在您的案例中可能适用或不适用的其他注意事项

控制器实例应始终通过新的FXMLLoader（）。load（...）调用（不是通过控制器本身的new关键字创建，除非您随后使用loader.setController()）。< / LI>
fxml文件必须为您的密码字段指定一个名称，该名称与控制器中的名称相匹配（在您的情况下，此名称为passwordBox）。

示例

GatewayApplication.java

package application; import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Scene; import javafx.scene.layout.AnchorPane; import javafx.stage.Stage; import java.io.IOException; public class GatewayApplication extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) throws IOException { FXMLLoader loader = new FXMLLoader(getClass().getResource("passport.fxml")); AnchorPane layout = loader.load(); stage.setScene(new Scene(layout)); stage.show(); } }

MainController.java

由SceneBuilder生成View | Show Sample Skeleton。

package application; import java.net.URL; import java.util.ResourceBundle; import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.PasswordField; import javafx.scene.control.TextField; import javafx.scene.image.ImageView; import javafx.scene.input.MouseEvent; import javafx.scene.layout.AnchorPane; public class MainController { @FXML private ResourceBundle resources; @FXML private URL location; @FXML private Button connectButton; @FXML private ImageView favoritesButton; @FXML private AnchorPane mainAnchor; @FXML private PasswordField passwordBox; @FXML private Label passwordLbl; @FXML private TextField portBox; @FXML private Label portLbl; @FXML private TextField serverIPBox; @FXML private Label serverIPLbl; @FXML private ImageView settingsButton; @FXML private TextField usernameBox; @FXML private Label usernameLbl; @FXML void connectClicked(ActionEvent event) { System.out.println("password = " + passwordBox.getText()); } @FXML void favoritesClicked(MouseEvent event) { } @FXML void settingsClicked(MouseEvent event) { } @FXML void initialize() { assert connectButton != null : "fx:id=\"connectButton\" was not injected: check your FXML file 'passport.fxml'."; assert favoritesButton != null : "fx:id=\"favoritesButton\" was not injected: check your FXML file 'passport.fxml'."; assert mainAnchor != null : "fx:id=\"mainAnchor\" was not injected: check your FXML file 'passport.fxml'."; assert passwordBox != null : "fx:id=\"passwordBox\" was not injected: check your FXML file 'passport.fxml'."; assert passwordLbl != null : "fx:id=\"passwordLbl\" was not injected: check your FXML file 'passport.fxml'."; assert portBox != null : "fx:id=\"portBox\" was not injected: check your FXML file 'passport.fxml'."; assert portLbl != null : "fx:id=\"portLbl\" was not injected: check your FXML file 'passport.fxml'."; assert serverIPBox != null : "fx:id=\"serverIPBox\" was not injected: check your FXML file 'passport.fxml'."; assert serverIPLbl != null : "fx:id=\"serverIPLbl\" was not injected: check your FXML file 'passport.fxml'."; assert settingsButton != null : "fx:id=\"settingsButton\" was not injected: check your FXML file 'passport.fxml'."; assert usernameBox != null : "fx:id=\"usernameBox\" was not injected: check your FXML file 'passport.fxml'."; assert usernameLbl != null : "fx:id=\"usernameLbl\" was not injected: check your FXML file 'passport.fxml'."; } }

的style.css

.root { -fx-background-color: cornsilk; }

passport.fxml

<?xml version="1.0" encoding="UTF-8"?> <?import javafx.scene.control.*?> <?import javafx.scene.image.Image?> <?import javafx.scene.image.ImageView?> <?import javafx.scene.layout.AnchorPane?> <?import javafx.scene.text.Font?> <?import java.net.URL?> <AnchorPane fx:id="mainAnchor" opacity="1.0" prefHeight="200.0" prefWidth="408.0000999999975" styleClass="back" xmlns:fx="http://javafx.com/fxml" fx:controller="application.MainController"> <children> <Label fx:id="serverIPLbl" layoutX="14.0" layoutY="28.0" prefWidth="175.0" text="Server IP"> <font> <Font name="Segoe UI" size="12.0" fx:id="x1" /> </font> </Label> <TextField fx:id="serverIPBox" layoutX="14.0" layoutY="50.0" prefWidth="175.0" /> <Label fx:id="portLbl" font="$x1" layoutX="215.0" layoutY="28.0" prefWidth="175.0" text="Port" /> <TextField fx:id="portBox" layoutX="215.0" layoutY="50.0" prefWidth="175.0" /> <Label fx:id="passwordLbl" font="$x1" layoutX="14.0" layoutY="81.0" prefWidth="175.0" text="Server Password" /> <ImageView fx:id="settingsButton" fitHeight="23.0" fitWidth="23.0" layoutX="14.0" layoutY="137.0" onMouseClicked="#settingsClicked" pickOnBounds="true" preserveRatio="true"> <image> <Image url="http://icons.iconarchive.com/icons/hopstarter/soft-scraps/24/Gear-icon.png" /> </image> </ImageView> <Button id="startServer" fx:id="connectButton" layoutX="14.0" layoutY="167.0" mnemonicParsing="false" onAction="#connectClicked" prefHeight="22.0" prefWidth="376.0" text="Connect" /> <Label fx:id="usernameLbl" font="$x1" layoutX="215.0" layoutY="81.0" prefWidth="175.0" text="Username" /> <TextField id="serverIPBox" fx:id="usernameBox" layoutX="215.0" layoutY="103.0" prefWidth="175.0" promptText="a-z A-Z 0-9 _ - chars allowed" /> <ImageView id="favoriteButton" fx:id="favoritesButton" fitHeight="23.0" fitWidth="23.0" layoutX="55.0" layoutY="137.0" onMouseClicked="#favoritesClicked" pickOnBounds="true" preserveRatio="true"> <image> <Image url="http://icons.iconarchive.com/icons/hopstarter/soft-scraps/24/Button-Favorite-icon.png"/> </image> </ImageView> <PasswordField fx:id="passwordBox" layoutX="14.0" layoutY="103.0" prefWidth="175.0" promptText="Optional" /> </children> <stylesheets> <URL value="@style.css" /> </stylesheets> </AnchorPane>

示例程序UI

示例程序输出

在密码字段中输入魔法作品“xyzzy”并按下连接后，程序将从字段中提取密码并将其打印到控制台：

password = xyzzy

使用的测试系统是运行Java 8b121的OS X 10.9。

在以后的问题中，您可能需要提供minimal, complete, tested and readable example。所有问题都不需要这样的样本，但肯定会对此有所帮助。

JavaFX密码字段不起作用

1 个答案: