Java @ComponentScan 在 Spring Boot AutoConfiguration 类中不起作用？
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@ComponentScan doesn't work in Spring boot AutoConfiguration class?
提问by Dongqing
I am trying to create a new starter. I have a business module, say ProjectManager, that contains some classes annotated with @Component. Following the tutorial, I created an autoconfigure module, it contains an AutoConfiguration class. Firstly, I tried to use @ComponentSan to find the beans in my business module.
我正在尝试创建一个新的启动器。我有一个业务模块，比如说 ProjectManager，它包含一些用 @Component 注释的类。按照教程，我创建了一个自动配置模块，它包含一个 AutoConfiguration 类。首先，我尝试使用 @ComponentSan 在我的业务模块中查找 bean。
@ComponentScan(value = {"com.foo.project"})
@ConditionalOnClass({Project.class})
@Configuration
public class ProjectAutoConfiguration {
....
}
But it doesn't work. I have to add additional configuration class as below:
但它不起作用。我必须添加额外的配置类，如下所示：
@Configuration
@ComponentScan(value = {"com.foo.project"})
@MapperScan(value = {"com.foo.project"})
public class ProjectConfig {
}
And then import it into AutoConfiguration class like below:
然后将其导入到 AutoConfiguration 类中，如下所示：
@Import(ProjectConfig.class)
@ConditionalOnClass({Project.class})
@Configuration
public class ProjectAutoConfiguration {
....
}
That works. But according to the spring doc.
那个有效。但是根据 spring文档。
auto-configuration is implemented with standard @Configuration classes
自动配置是用标准的@Configuration 类实现的
So my question is, Why @ComponentScan doesn't work here ? Did I make something wrong? Or it is by design ?
所以我的问题是，为什么 @ComponentScan 在这里不起作用？我做错了什么吗？还是设计使然？
采纳答案by emoleumassi
you have to use the compentscan annotation into the main class. Here a sample code:
您必须在主类中使用 compentscan 注释。这是一个示例代码：
@SpringBootApplication
@ComponentScan("com.foo.project")
public class MainApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(MainApplication.class);
}
public static void main(String[] args) {
new MainApplication().configure(new SpringApplicationBuilder(MainApplication.class)).run(args);
}
}
Cheers
干杯
回答by Chathuranga Tennakoon
Can you try with following?
您可以尝试以下吗？
@ConditionalOnClass({Project.class})
@Configuration
@EnableAutoConfiguration
@ComponentScan(value = {"com.foo.project"})
public class ProjectAutoConfiguration {
....
}
回答by Merijn Vogel
Automatic everythingrequires the Application class (annotated with @SpringBootApplication) to be in a "higher" package than the components you want to scan.
自动一切都需要 Application 类（用 @SpringBootApplication 注释）位于比您要扫描的组件“更高”的包中。
Use:
用：
package com.example.foo;
for your application and put components in a package like:
用于您的应用程序并将组件放入一个包中，例如：
package com.example.foo.entities;
