java是否创建具有特定@ConditionalOnProperty的注释？

Question

我的计划是创建一个注释，如果我把它放在一个类上，那么只有当@ConditionalOnProperty为true时，这个类才会是一个bean

我有这个：

@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)

我只想在application.properties文件中存在backend-auth.enabled=true时创建一些bean（控制器/服务）。现在我有了这个：

@RestController
@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)
public class FirstController {}

@RestController
@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)
public class SecondController{}

@Service
@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)
public class FirstService {}

@Service
@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)
public class SecondService{}

正如你所看到的，我正在重用@ConditionalOnProperty部分，如果我想更改prefix、value或havingValue值，那么我必须在4个位置进行更改，如果不注意，可能会错过它

我正在考虑创建一个包含@ConditionalOnProperty的注释，并在我的FirstController，SecondController，FirstService，SecondService上使用这个自定义注释

我想以这样的方式结束：

@RestController
@BackendAuthEnabled
public class FirstController {}

@RestController
@BackendAuthEnabled
public class SecondController{}

@Service
@BackendAuthEnabled
public class FirstService {}

@Service
@BackendAuthEnabled
public class SecondService{}

Answer 1

好了：

@ConditionalOnProperty(prefix = "backend-auth", value = "enabled", havingValue = "true", matchIfMissing = false)
@Retention(RetentionPolicy.RUNTIME)
public @interface BackendAuthEnabled {
}

（感谢Wim的链接）