java - 我正在尝试将 URL 图像添加到我的 javafx 应用程序中

Question

我读了一个 XML，其中包含来自不同气象站 (WeerStation) 的数据(包括 URL)。现在，当您从组合框中选择一个气象站时，我想在我的应用程序中显示该 URL，就像一个小型天气应用程序，但我无法完成它...

public class WeatherGUI extends Application {
ComboBox combo;
ArrayList<WeerStation> list = new ArrayList();

@Override
public void start(Stage primaryStage) throws ParserConfigurationException, IOException, SAXException {

    BuienRadarController controller = new BuienRadarController(this);
    list = controller.getStations();
    combo = new ComboBox();
    combo.getItems().addAll(list);
    combo.setPromptText("Het weer in");

    VBox vbox = new VBox(8);
    vbox.setAlignment(Pos.CENTER);
    Label label1 = new Label();
    Label label2 = new Label();
    vbox.getChildren().addAll(label1,label2);

    Button button = new Button("Kies");
    button.setOnAction((ActionEvent e) -> {
        WeerStation station = (WeerStation) combo.getValue();
        label1.setText("Het weer in " + station.toString() + ":");
        label2.setText(station.getBeschrijving());
        // ADD url to vbox
    });

    VBox layout = new VBox(10);
    layout.setPadding(new Insets(6));
    layout.getChildren().addAll(combo,button,vbox);

    Scene scene = new Scene(layout, 300, 250);

    primaryStage.setTitle("BuienRadar");
    primaryStage.setScene(scene);
    primaryStage.show();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}}

Answer 1

假设该 URL 是一个内容为标准格式(例如 png)图像的 URL，您可以声明一个 ImageView 并将图像设置为从该 URL 创建的 Image:

@Override
public void start(Stage primaryStage) throws ParserConfigurationException, IOException, SAXException {

    BuienRadarController controller = new BuienRadarController(this);
    list = controller.getStations();
    combo = new ComboBox();
    combo.getItems().addAll(list);
    combo.setPromptText("Het weer in");

    VBox vbox = new VBox(8);
    vbox.setAlignment(Pos.CENTER);
    Label label1 = new Label();
    Label label2 = new Label();
    ImageView imageView = new ImageView();
    vbox.getChildren().addAll(label1,label2,imageView);

    Button button = new Button("Kies");
    button.setOnAction((ActionEvent e) -> {
        WeerStation station = (WeerStation) combo.getValue();
        label1.setText("Het weer in " + station.toString() + ":");
        label2.setText(station.getBeschrijving());
        // ADD url to vbox
        imageView.setImage(new Image(station.getURL().toExternalForm()));
    });

    VBox layout = new VBox(10);
    layout.setPadding(new Insets(6));
    layout.getChildren().addAll(combo,button,vbox);

    Scene scene = new Scene(layout, 300, 250);

    primaryStage.setTitle("BuienRadar");
    primaryStage.setScene(scene);
    primaryStage.show();
}