JavaFX 密碼字段

JavaFX教程 - JavaFX密碼字段

PasswordField用于密碼輸入。用戶鍵入的字符通過顯示回顯字符串被隱藏。

創(chuàng)建密碼字段

以下代碼使用來自PasswordField類的默認(rèn)構(gòu)造函數(shù)創(chuàng)建一個密碼字段，然后為密碼字段設(shè)置提示消息文本。提示消息在字段中顯示為灰色文本，并為用戶提供該字段是什么的提示，而不使用標(biāo)簽控件。

PasswordField passwordField = new PasswordField();
passwordField.setPromptText("Your password");

PasswordField類有setText方法來為控件設(shè)置文本字符串。對于密碼字段，指定的字符串由echo字符隱藏。默認(rèn)情況下，echo字符是一個點(diǎn)。

密碼字段中的值可以通過getText方法獲取。

例子

密碼字段和操作偵聽器

/*
 * Copyright (c) 2011, 2012 Oracle and/or its affiliates.
 * All rights reserved. Use is subject to license terms.
 *
 * This file is available and licensed under the following license:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *  - Neither the name of Oracle nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {

  final Label message = new Label("");

  @Override
  public void start(Stage stage) {
    Group root = new Group();
    Scene scene = new Scene(root, 260, 80);
    stage.setScene(scene);
    stage.setTitle("Password Field Sample");

    VBox vb = new VBox();
    vb.setPadding(new Insets(10, 0, 0, 10));
    vb.setSpacing(10);
    HBox hb = new HBox();
    hb.setSpacing(10);
    hb.setAlignment(Pos.CENTER_LEFT);

    Label label = new Label("Password");
    final PasswordField pb = new PasswordField();

    pb.setOnAction(new EventHandler<ActionEvent>() {
      @Override
      public void handle(ActionEvent e) {
        if (!pb.getText().equals("abc")) {
          message.setText("Your password is incorrect!");
          message.setTextFill(Color.web("red"));
        } else {
          message.setText("Your password has been confirmed");
          message.setTextFill(Color.web("black"));
        }
        pb.setText("");
      }
    });

    hb.getChildren().addAll(label, pb);
    vb.getChildren().addAll(hb, message);

    scene.setRoot(vb);
    stage.show();
  }

  public static void main(String[] args) {
    launch(args);
  }
}

上面的代碼生成以下結(jié)果。