我怎么能@Autowire一个从外部jar创建的spring bean？

问题描述

我有一个模块/ jar我已经创建并用作util 库 。我在那里创建了一个服务：

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 { ... }

...此处位于包中： com.inin.architect.permissions 在我的主应用程序中，我正在引用/加载这个jar（即设置为app的maven POM.xml文件中的依赖项），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：

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

@Autowired
PermissionsService permissions

在应用程序的弹簧设置中，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 { }

然而，当我在tomcat下运行我的应用程序时，它抱怨 PermissionsService 没有bean：org.springframework .beans.factory.NoSuchBeanDefinitionException：没有类型的限定bean ...

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，我怎样才能将lib从lib中带到我的应用程序中？当然有办法。你是否必须将库设置为一个完整的弹簧MVC应用程序，以便这可以工作？即你是否必须在lib中设置@Configuration和@ComponentScan？

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

你必须扫描至少包含要注入的类的包。例如，使用Spring 4注释：

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 {
...
}

这与XML配置的原理相同。

It is the same principle for XML configuration.

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