春天開機vaadin項目@Autowired

Question

我使用彈簧啓動vaadin project.I有這樣的倉庫：public interface PersonneRepository extends JpaRepository<Person, Integer>, JpaSpecificationExecutor {}

我想在我的課。在用戶界面和瀏覽我這樣做是爲了實例化這個庫： @ Autowired PersonneRepository回購; 這個工作很容易，但在簡單的類（公共類x {}}回購空返回null。而我不喜歡它通過參數或會話。請問你有什麼想法嗎？

Answer 1

爲了注入依賴關係，依賴類必須由Spring來管理。這可以通過類註釋來實現@Component：

指示註釋類是「組件」。當使用基於註釋的配置和類路徑掃描時，這些類被認爲是自動檢測的候選對象。

對於Vaadin類@SpringComponent使用它的建議：

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

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... 
    } 
}