JavaFX和Spring-bean无法自动装配
我在结合JavaFX和Spring时遇到问题。我有一个简单的JavaFX应用程序,它运行良好。现在,我正在尝试向其中添加一些Spring。我在Spring教程中跟随JavaFX 2。我的代码:
src/main|
|_java/mycompany/imageviewer
| |
| |_Startup.java
| |_controller/ImageViewController.java
| |_dataprovider
| |impl/DataProviderImpl.java
| |_config
| |_SpringFxmlLoader.java
| |_SpringApplicationConfig.java
|_resources/mycompany/view/ImageViewer.fxml
Startup.java
是具有main的文件:
public class Startup extends Application { private static final SpringFxmlLoader loader = new SpringFxmlLoader();
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
...
Parent root = (Parent) loader.load("/mycompany/imageviewer/view/ImageViewer.fxml","mycompany/imageviewer/bundle/bundle");
Scene scene = new Scene(root);
...css etc...
primaryStage.setScene(scene);
primaryStage.show();
}
}
ImageviewerController.java
:
@Controllerpublic class ImageViewerController {
private static final Logger LOG = Logger.getLogger(ImageViewerController.class);
@FXML
...
@Autowired
private DataProvider dataProvider;
public ImageViewerController() {
LOG.debug("Controller initialized. DataProvider is null: "+(dataProvider==null));
}
DataProviderImpl.java
:
@Service("dataProvider")public class DataProviderImpl implements DataProvider {
private static final Logger LOG = Logger.getLogger(DataProviderImpl.class);
public DataProviderImpl() {
LOG.debug("DataProviderImpl initialized.");
}
...methods...
}
我的SpringFxmlLoader在教程中看起来与此类似:
public class SpringFxmlLoader { private static final ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringApplicationConfig.class);
public Object load(String url, String resources) {
FXMLLoader loader = new FXMLLoader();
loader.setControllerFactory(clazz -> applicationContext.getBean(clazz));
try {
return loader.load(getClass().getResource(url), ResourceBundle.getBundle(resources));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
我的SpringApplicationConfig:
@Configuration@ComponentScan(basePackages = {"mycompany.imageviewer.controller", "mycompany.imageviewer.dataprovider.impl" })
public class SpringApplicationConfig {
private static final Logger LOG = Logger.getLogger(SpringApplicationConfig.class);
@Bean
public DataProvider dataProvider() {
LOG.debug("Initializing dataProvider via SpringApplicationConfig");
return new DataProviderImpl();
}
@Bean
public ImageViewerController imageViewerController() {
LOG.debug("Initializing ImageViewerController via SpringApplicationConfig");
return new ImageViewerController();
}
}
在我的应用程序中,我具有ImageViewer.fxml
绑定控制器:
<AnchorPane fx:controller="mycompany.imageviewer.controller.ImageViewerController" xmlns="http://javafx.com/javafx/8.0.51" xmlns:fx="http://javafx.com/fxml/1" >
当我运行程序时,我得到日志:
DEBUG [main] mycompany.imageviewer.controller.ImageViewerController:74 - Controller initialized. DataProviderImpl is null: trueDEBUG [main] mycompany.imageviewer.dataprovider.impl.DataProviderImpl:22 - DataProviderImpl initialized.
DEBUG [JavaFX Application Thread] mycompany.imageviewer.controller.ImageViewerController:74 - Controller initialized. DataProviderImpl is null: true
这表明,我的控制器已初始化两次,并且dataProvider
未正确绑定。是什么让我困惑,是我不期而遇写错basePackages
以ComponentScan
这种方式与错的包:
@ComponentScan(basePackages = {"mycompany.imageviewer.dataprovider.controller", "mycompany.imageviewer.dataprovider.dataprovider.impl" })
Bean在SpringApplicationConfig.java
运行时初始化方法,我从中获取日志:
2015-09-06 16:52:29,420 DEBUG [main] com.capgemini.starterkit.imageviewer.config.SpringApplicationConfig:19 - Initializing dataProvider via SpringApplicationConfig2015-09-06 16:52:29,431 DEBUG [main] com.capgemini.starterkit.imageviewer.dataprovider.impl.DataProviderImpl:22 - DataProviderImpl initialized.
DEBUG [main] mycompany.imageviewer.config.SpringApplicationConfig:25 - Initializing ImageViewerController via SpringApplicationConfig
DEBUG [main] mycompany.imageviewer.controller.ImageViewerController:74 - Controller initialized. DataProviderImpl is null: true
DEBUG [JavaFX Application Thread] mycompany.imageviewer.controller.ImageViewerController:74 - Controller initialized. DataProviderImpl is null: true
当我运行时,basePackages =
"com.capgemini.starterkit.imageviewer"效果与第一种情况相同。我是spring的新手,也许我犯了一些简单的错误,但是我找不到它们,所以如果有人可以帮助我配置spring的话,那会很棒。
回答:
在FXMLLoader.load(URL,
ResourceBundle)您所呼叫的方法是一种static
方法-
因此它实际上不关注了FXMLLoader
你化实例,以及因此忽略了controllerFactory
它引用您的Spring bean工厂。
重写您的SpringFXMLLoader
类,如下所示:
public class SpringFxmlLoader { private static final ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringApplicationConfig.class);
public Object load(String url, String resources) {
FXMLLoader loader = new FXMLLoader();
loader.setControllerFactory(clazz -> applicationContext.getBean(clazz));
loader.setLocation(getClass().getResource(url));
loader.setResources(ResourceBundle.getBundle(resources));
try {
return loader.load();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
这使用 实例
方法loader.load()
,它将使用您的控制器工厂:即它将使用Spring实例化控制器。
您看到两次加载控制器的原因是,默认情况下,bean工厂赋予了控制器单例作用域并使其急切地创建,因此,一旦创建bean
factory(applicationContext
),它就会创建一个控制器。该控制器将进行dataProvider
初始化(当然,但仅 在
构造函数完成 之后 )。然后,对静态FXMLLoader.load(...)
方法的调用通过通常的机制(即,通过调用其no-
arg构造函数)创建第二个控制器。该实例将不会dataProvider
在任何时候进行初始化。
顺便说一句,您可能不希望控制器成为单例。如果要两次加载FXML文件,以获取的两个实例,则Parent
可能需要每个实例都有其自己的控制器,否则会发生奇怪的行为。我建议将控制器作为原型(这意味着Bean工厂将在每次请求实例时创建一个新实例,而不是重用单个实例)。您可以在config类中执行以下操作:
@Configuration@ComponentScan(basePackages = {"mycompany.imageviewer.controller", "mycompany.imageviewer.dataprovider.impl" })
public class SpringApplicationConfig {
private static final Logger LOG = Logger.getLogger(SpringApplicationConfig.class);
@Bean
public DataProvider dataProvider() {
LOG.debug("Initializing dataProvider via SpringApplicationConfig");
return new DataProviderImpl();
}
@Bean
@Scope("prototype")
public ImageViewerController imageViewerController() {
LOG.debug("Initializing ImageViewerController via SpringApplicationConfig");
return new ImageViewerController();
}
}
以上是 JavaFX和Spring-bean无法自动装配 的全部内容, 来源链接: utcz.com/qa/397625.html