我如何@Autowire 一个从外部罐子创建的弹簧豆? [英] How can I @Autowire a spring bean that was created from an external jar?

问题描述

我创建了一个模块/jar 并用作实用程序库.我在那里创建了一个服务，如下所示:

I have a module/jar that I've created and am using as a util library. I created a service in there like so:

@Service
public class PermissionsService { ... }

... 在这里的一个包中:com.inin.architect.permissions 并且在我的主应用程序中，我正在引用/加载这个 jar(即设置为应用程序的 maven POM.xml 文件)，如下所示:

... where this resides in a package here: com.inin.architect.permissions and in my main application, I'm referencing/loading this jar (i.e. set as a dependency in the maven POM.xml file for the app) like so:

<dependency>
        <groupId>com.inin.architect</groupId>
        <artifactId>permissions</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>

在应用程序中，我想使用该服务，例如:

and within the application I want to use that service like:

@Autowired
PermissionsService permissions

在应用程序的 spring 设置中，我有这个:

In the application's spring setup, I've got this:

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.inin.generator", "com.inin.architect.permissions" })
public class WebConfig extends WebMvcConfigurerAdapter implements ServletContextAware { }

但是，当我在 tomcat 下运行我的应用程序时，它抱怨没有用于 PermissionsService 的 bean:org.springframework.beans.factory.NoSuchBeanDefinitionException: Noqualifying bean of type ..."

However when I run my application under tomcat, it complains that there isn't a bean for the PermissionsService: "org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ..."

那么，如何将 lib 中的 bean 带入我的应用程序中?肯定有办法.您是否必须将该库设置为成熟的 Spring MVC 应用程序才能使其正常工作?即你必须在库中设置 @Configuration 和 @ComponentScan 吗?

So, how can I bring over the bean from the lib into my application? Surely there's a way. Do you have to set the library up as a full blown spring MVC application so that this can work? i.e. do you have to have @Configuration and @ComponentScan setup in the lib as well?

推荐答案

您必须至少扫描包含要注入的类的包.例如，使用 Spring 4 注解:

You have to scan at least the package containing the class you want to inject. For example, with Spring 4 annotation:

@Configuration
@ComponentScan("com.package.where.my.class.is")
class Config {
...
}

XML 配置原理相同.

It is the same principle for XML configuration.

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