Spring Boot 中读取配置文件中的变量

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
    <version>2.2.0.RELEASE</version>
</dependency>

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my:
  name: wanngshushuo

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@Component // 文档中没有这个注释，但是不写会报错
@ConfigurationProperties(prefix="my")
public class MyConfig {
    private String name;
    // getter setter
}

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@RestController
public class MainController {

    private final MyConfig myConfig;

    MainService(MyConfig myConfig){
        this.myConfig = myConfig;
    }

    @GetMapping("/update")
    public String updateBlog(){
        return myConfig.getName();
    }
}