Vaadin+Spring (without SpringBoot) with JavaConfig

Question

我正在尝试将vaadin与spring(没有spring-boot)和基于java注释的spring部分配置相结合。

自动装配似乎在vadin -ui部分起作用，但在"自定义ui类"中不起作用。"公共类LoginScreen扩展CustomComponent")。我在SysOut上得到一个NPE或一个空对象。

进一步我注意到，"@ComponentScan(basePackages={"net.myapp"})"不是扫描bean。声明bean的唯一方法是在CustomConfiguration本身中。

XML-Configuration不是我喜欢的东西。

我遵循这个教程:链接

CustomConfiguration.java

@Configuration
@ComponentScan(basePackages={"net.myapp"})
@EnableVaadin
public class CustomConfiguration {
// this is working but i want to use componentscan!
@Bean
public String test() {
    return "test...";
}
@Bean
public TestBean testBean() {
    return new TestBean();
}
@Bean
public LoginScreen loginScreenBean() {
    return new LoginScreen();
}

}

SpringVaadinServlet.java

@WebServlet(value = "/*", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = Application.class)
@SuppressWarnings("serial")
public class SpringVaadinServlet extends VaadinServlet implements SessionInitListener {
@Autowired
protected VaadinUIProvider applicationProvider;
@Override
public void init(ServletConfig config) throws ServletException {
    super.init(config);
    AutowireCapableBeanFactory ctx = ((ApplicationContext) 
            getServletContext().getAttribute("applicationContext")).getAutowireCapableBeanFactory();
    ctx.autowireBean(this);
}
@Override
protected void servletInitialized() {
    getService().addSessionInitListener(this);
}
@Override
public void sessionInit(SessionInitEvent event) throws ServiceException {
    event.getSession().addUIProvider(applicationProvider);      
}

}

VaadinUIProvider.java

@SpringComponent
@SuppressWarnings("serial")
public class VaadinUIProvider extends UIProvider {
    @Autowired
    ApplicationContext applicationContext;
    @Override
    public Class<? extends UI> getUIClass(UIClassSelectionEvent event) {
        return Application.class;
    }
    @Override
    public UI createInstance(UICreateEvent event) {
        UI instance = new Application();
        System.out.println("applicationContext is null? " + applicationContext);
        applicationContext.getAutowireCapableBeanFactory().autowireBean(instance);
        return instance;
    }
}

SpringApplicationContextListener.java

@WebListener
public class SpringApplicationContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(CustomConfiguration.class);
        sce.getServletContext().setAttribute("applicationContext", applicationContext);     
    }
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
    }
}

Application.java

@Theme("mytheme1")
@SpringUI
@SuppressWarnings("serial")
public class Application extends UI {
    @Autowired
    private TestBean testBean;
    @Autowired
    private String test;
    @Override
    protected void init(VaadinRequest vaadinRequest) {
        // working
        System.out.println("init testBean: " + testBean);
        System.out.println("init test: " + test);
        Window window = new Window();
        window.setContent(new LoginScreen());
        window.setClosable(false);
        window.setWidth("400px");
        window.setHeight("280px");
        window.setModal(true);
        window.setDraggable(false);
        window.setResizable(false);
        window.center();
        addWindow(window);
        setSizeFull();
    }
}

和下面的"custom-ui class"LoginScreen.java

@UIScope
@SuppressWarnings("serial")
public class LoginScreen extends CustomComponent {
    public static final String VIEW_NAME = "";
    final FormLayout layout = new FormLayout();
    TextField userName = new TextField();
    TextField passWord = new TextField();
    Button submit = new Button("Submit");
    @Autowired
    private TestBean testBean;
    @Autowired
    private String test;
    public LoginScreen() {
        userName.setCaption("Benutzername:");
        passWord.setCaption("Passwort:");
// not working (null)
        System.out.println("loginscreen test: " + testBean);
        System.out.println("loginscreen test: " + test);
        setSizeFull();
    }
}

Answer 1

窗口。setContent (新LoginScreen () );

如果你想要@Autowired注释的字段被注入，Spring应该创建LoginScreen。

在Application类中注入LoginScreen实例