考虑以下样本。
如何访问控制器中应用程序的参数/参数?
谢谢。
注意:我曾尝试将App.java和MyController.java混合在一个Class文件中,但没有帮助。
App.java(简化):
public class App extends Application {
public static void main(String[] args) {
Application.launch(App.class, args);
}
@Override
public void start(Stage primaryStage) throws Exception {
// output arguments in console
System.out.println(getParameters().getNamed().toString());
Parent root = FXMLLoader.load(getClass().getResource("MyView.fxml"));
final Scene scene = new javafx.scene.Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
}
MyController.java(简化):
public class MyController implements Initializable {
@Override
public void initialize(URL url, ResourceBundle rb) {
// HOW TO getParameters() HERE ?
}
@FXML
private Button myButton;
@FXML
private void my_Action(ActionEvent event) {
// HOW TO getParameters() HERE ?
}
}
MyView.fxml(简化):
<AnchorPane fx:id="root" fx:controller="mainpackage.MyController">
<children>
<Button fx:id="myButton" onAction="#my_Action" text="Start" />
</children>
</AnchorPane>
答案 0 :(得分:14)
1。最简单的方法 - 将它们保存在应用中:
public class App extends Application {
public static void main(String[] args) { launch(); }
public static String parameters;
@Override
public void start(Stage primaryStage) throws Exception {
parameters = getParameters().getNamed().toString();
Parent root = FXMLLoader.load(getClass().getResource("MyView.fxml"));
final Scene scene = new javafx.scene.Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
}
并在控制器中阅读:
public class MyController implements Initializable {
@Override
public void initialize(URL url, ResourceBundle rb) {
System.out.println(App.parameters);
}
2。下一主题介绍了更复杂(但总体上更好)的方法:
答案 1 :(得分:0)
public static <T extends Node, P> T load(String resource, final P parameter)
throws MoisException {
try {
logger.debug("resource: {}; parameter: {}", resource, parameter);
FXMLLoader loader = new FXMLLoader(getResource(resource));
// pass parameter into Controller,before invoke the initialize()
loader.setControllerFactory(new Callback<Class<?>, Object>() {
@Override
public Object call(Class<?> param) {
Object controller = null;
try {
controller = ReflectUtil.newInstance(param);
} catch (InstantiationException e) {
throw new MoisException("can't new instance for: " + param.getName(), e);
} catch (IllegalAccessException e) {
throw new MoisException("can't new instance for: " + param.getName(), e);
}
if (controller instanceof ParameterAware) {
((ParameterAware<P>) controller).setParameter(parameter);
}
return controller;
}
});
T node = (T) loader.load();
// pass parameter to node
node.setUserData(parameter);
return node;
} catch (IOException e) {
throw new MoisException("can't load the file: " + resource, e);
}
}
和ParameterAware:
public interface ParameterAware<T> {
void setParameter(T param);
}