Question

我正在使用spring boot vaadin项目。我有一个这样的存储库：public interface PersonneRepository extends JpaRepository<Person, Integer>, JpaSpecificationExecutor {}

我想在我的类中实例化这个存储库。在Ui和Views中我这样做： @Autowired PersonneRepository repo; 这项工作很容易，但在简单的类（公共类x {}）repo返回null。我不喜欢在参数或会话中将它传递。请问有什么想法吗？

Answer 1

要注入依赖项，依赖类必须由Spring管理。这可以通过类注释@Component：

来实现

表示带注释的类是“组件”。在使用基于注释的配置和类路径扫描时，此类被视为自动检测的候选者。

用于Vaadin类@SpringComponent，建议：

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

示例：

@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...
    }
}

Spring boot vaadin项目@Autowired

1 个答案: