春天开机vaadin项目@Autowired

Question

我使用弹簧启动vaadin project.I有这样的仓库：public interface PersonneRepository extends JpaRepository<Person, Integer>, JpaSpecificationExecutor {}

我想在我的课。在用户界面和浏览我这样做是为了实例化这个库： @ Autowired PersonneRepository回购; 这个工作很容易，但在简单的类（公共类x {}}回购空返回null。而我不喜欢它通过参数或会话。请问你有什么想法吗？

Answer 1

为了注入依赖关系，依赖类必须由Spring来管理。这可以通过类注释来实现@Component：

指示注释类是“组件”。当使用基于注释的配置和类路径扫描时，这些类被认为是自动检测的候选对象。

对于Vaadin类@SpringComponent使用它的建议：

别名{@link org.springframework.stereotype.Component}，以防止{@link com.vaadin.ui.Component}冲突。

例子：

@Repository // Indicates that an annotated class is a "Repository", it's a specialized form of @Component 
public interface PersonRepository extends JpaRepository<Person, Long> { 
    // Spring generates a singleton proxy instance with some common CRUD methods 
} 

@UIScope // Implementation of Spring's {@link org.springframework.beans.factory.config.Scope} that binds the UIs and dependent beans to the current {@link com.vaadin.server.VaadinSession} 
@SpringComponent 
public class SomeVaadinClassWichUsesTheRepository { 

    private PersonRepository personRepository; 

    @Autowired // setter injection to allow simple mocking in tests 
    public void setPersonRepository(PersonRepository personRepository) { 
     this.personRepository = personRepository; 
    } 

    /** 
    * The PostConstruct annotation is used on a method that needs to be executed after dependency injection is done to perform any initialization. 
    */ 
    @PostConsruct 
    public init() { 
     // do something with personRepository, e.g. init Vaadin table... 
    } 
}