在你的应用程序类上添加 @ComponentScan。
```java
package com.example.config;
@SpringBootApplication
@ComponentScan(basePackages = "com.example")
public class SpringBootComponentScanApp {
}

<details>
<summary>英文:</summary>
Add a @ComponentScan on your application class.
    package com.example.config;
    @SpringBootApplication
    @ComponentScan(basePackages = &quot;com.example&quot;)
    public class SpringBootComponentScanApp {
    }
I personally think it&#39;s a good idea to put your configuration in a sub-package &quot;com.example.config&quot; and not in the parent package &quot;com.example&quot;, but you need to override Spring Boot&#39;s default component scan for that case.
See also https://www.baeldung.com/spring-component-scanning
</details>
# 答案2
**得分**: 0
Spring Boot 只会从应用程序类的包（使用 `@SpringBootApplication` 注解）及其以下位置开始扫描组件（控制器、服务、存储库等）。
因此，最好使用 `com.example.Application`，然后您可以使用 `com.example.rest.TheController`，这样应该可以正常工作。
<details>
<summary>英文:</summary>
Spring Boot will only scan for components (controllers, services, repositories, ...) starting from the package of the application class (annotated with `@SpringBootApplication`) and below.
So best to use `com.example.Application`, then you can use `com.example.rest.TheController` and things should work.
</details>