通过接口自动装配 Spring Bean

如何解决通过接口自动装配 Spring Bean

我正在尝试在我的项目中进行六边形架构。 模块结构如下所示：

我不希望域（核心）模块依赖于其他模块。它的逻辑应该通过 api 公开，因此我希望其他模块/客户端，如 rest 模块，仅依赖于 API 模块。

我想通过一个接口 RestaurantService（来自模块 api）使用 RestaurantServiceImpl（来自模块核心）。 Spring 无法为接口 RestaurantService 自动装配 Bean。这是 RestaurantServiceImpl 应该正确注册为 spring bean：

@Service
public class RestaurantServiceImpl implements RestaurantService {

    private final RestaurantRepository restaurantRepository;

    @Autowired
    public RestaurantServiceImpl(RestaurantRepository restaurantRepository) {
        this.restaurantRepository = restaurantRepository;
    }

    @Override
    public Optional<Restaurant> getById(RestaurantId restaurantId) {
        return restaurantRepository.findById(restaurantId);
    }
}

restaurant-management-api/pom.xml

<parent>
    <artifactId>restaurant-management</artifactId>
    <groupId>com.jc</groupId>
    <version>1</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>restaurant-management-api</artifactId>
<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.4</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

餐厅管理核心/pom.xml

<parent>
    <artifactId>restaurant-management</artifactId>
    <groupId>com.jc</groupId>
    <version>1</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>restaurant-management-core</artifactId>
<dependencies>
    <!--________________________INTERNAL________________________-->
    <dependency>
        <groupId>com.jc</groupId>
        <artifactId>restaurant-management-api</artifactId>
        <version>1</version>
   </dependency>
    <!--________________________SPRING________________________-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>5.3.7</version>
    </dependency>
   <!--________________________DATABASE________________________-->

    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>2.5.1</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.4</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

餐厅管理rest/pom.xml

<parent>
    <artifactId>restaurant-management</artifactId>
    <groupId>com.jc</groupId>
    <version>1</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>restaurant-management-rest</artifactId>
<dependencies>
    <!--________________________SPRING________________________-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>5.3.7</version>
    </dependency>
    <dependency>
        <groupId>com.jc</groupId>
        <artifactId>restaurant-management-api</artifactId>
        <version>1</version>
    </dependency>
</dependencies>

餐厅管理/pom.xml

<artifactId>restaurant-management</artifactId>
<packaging>pom</packaging>
<version>1</version>
<groupId>com.jc</groupId>
<modules>
    <module>restaurant-management-core</module>
    <module>restaurant-management-api</module>
    <module>restaurant-management-rest</module>
</modules>

解决方法

实际上我已经看到了问题所在——您已经定义了几个模块，但默认情况下，模块没有看到在另一个模块中定义的类。 RestaurantService 位于 Controller

的另一个模块中

您需要将模块作为依赖项添加到其他模块 pom。如果您只是在红线上按“Alt+Enter”，Intellij 应该建议您提供帮助。

您可能还需要确保在父 pom 中设置 Spring 以确保它跨越所有模块。