如何注入未注释Spring类的对象

假设我有一个JavaFx类和一个ViewState类，需要在start方法中创建

stage

的引用。我如何能够自动关联这种依赖关系？我知道

Stage.class

没有注释为

@Component

，因此Spring无法检测到duch

@Bean

@SpringBootApplication
@ComponentScan({"controller","service","dao","javafx.stage.Stage"})
@EntityScan( basePackages = {"Model"})
@Import({ SpringConfig.class})
public class JavaFXandSpringBootTestApplication extends Application{

    private ApplicationContext ctx;

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

    @Override
    public void start(Stage stage) throws Exception {
    ViewState viewState = ctx.getBean(ViewState.class);
}

ViewState类：

@Componenet
public class ViewState {

@Autowired
private ApplicationContext ctx;
private Stage stage;

@Autowired
public ViewState(Stage stage)
{
    this.stage = stage;
}
}

编译器按摩：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javafx.stage.Stage' available: expected at least 1

---

您可能根本不想这样做：您的

ViewState

类似乎是某种模型类，因此它不应该引用UI元素（例如

Stage

s）

不过，为了完整起见，下面是一个使用

ConfigurableApplicationContext.getBeanFactory（）.registerResolvableDependency（…）

的示例。请注意，由于在注册stage之前无法创建

视图

对象，因此需要使

视图

bean

@Lazy

：

package example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

@Component
@Lazy
public class View {

    @Autowired
    public View(Stage stage) {
        Button close = new Button("Close");
        close.setOnAction(e -> stage.hide());
        StackPane root = new StackPane(close);
        Scene scene = new Scene(root, 400, 400);
        stage.setScene(scene);
        stage.show();
    }
}

package example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

import javafx.application.Application;
import javafx.stage.Stage;

@SpringBootApplication
public class Main extends Application {

    private ConfigurableApplicationContext ctx ;

    @Override
    public void start(Stage primaryStage) {
        ctx = SpringApplication.run(Main.class);
        ctx.getBeanFactory().registerResolvableDependency(Stage.class, primaryStage);
        ctx.getBean(View.class);
    }

    @Override
    public void stop() {
        ctx.close();
    }

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