Spring，您可以在抽象类中自动布线吗？ [英] Spring can you autowire inside an abstract class?

问题描述

Spring无法自动连接对象？是否可以在抽象类中自动装配对象。假设所有模式都在application-context.xml中提供。

Spring is failing to autowire my object? Is it possible to autowire an object within an abstract class. Assume all schemas are supplied in application-context.xml

问题：@Service @Component应该在基类和扩展类（如果有）上使用什么批注？

Question: What annotation should be on the base and extending classes (if any) @Service @Component?

示例

abstract class SuperMan {

    @Autowire
    private DatabaseService databaseService;

    abstract void Fly();

    protected void doSuperPowerAction(Thing thing) {

        //busy code

        databaseService.save(thing);

    }
}

扩展课程 strong>

public class SuperGirl extends SuperMan {

    @Override
    public void Fly() {
        //busy code
    }

    public doSomethingSuperGirlDoes() {

        //busy code

        doSuperPowerAction(thing)

    }

application-context.xml

<context:component-scan base-package="com.baseLocation" />
<context:annotation-config/>

推荐答案

通常，Spring应该自动布线，只要您的抽象类在用于组件扫描的基本程序包中。

Normally, Spring should do the autowiring, as long as your abstract class is in the base-package provided for component scan.

请参见此和此以供进一步参考。

See this and this for further reference.

@Service 和 @Component 都是创建带注释的bean的构造型在Spring容器中输入。如Spring Docs所述，

@Service and @Component are both stereotypes that creates beans of the annotated type inside the Spring container. As Spring Docs state,

此注释用作@Component的特殊化，允许通过类路径自动检测
实现类扫描。

This annotation serves as a specialization of @Component, allowing for implementation classes to be autodetected through classpath scanning.

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