java - 如何将@ConditionalOnProperty继承到任何静态内部@Configuration类？

Question

如何创建一个包含静态内部配置类并继承@ConditionalOnProperty的@Configuration类？

@Configuration
@ConditionalOnProperty(value = "my.property", havingValue = "true")
public class MyConfiguration {
    @Configuration
    static class SubConfig1 {
    }

    @Configuration
    static class SubConfig2 {
    }

    ....
}

在此示例中，我希望仅当父级的条件为 true 时才加载内部类，因此我不必为每个配置类重复条件。这可能吗？

Answer 1

您的理解是错误的，所有用 @Configuration 注释的嵌套类都会自动加载。 With nested @Configuration classes

When bootstrapping such an arrangement, only AppConfig need be registered against the application context. By virtue of being a nested @Configuration class, DatabaseConfig will be registered automatically. This avoids the need to use an @Import annotation when the relationship between AppConfig and DatabaseConfig is already implicitly clear.

因此，通过使用@ConditionalOnProperty，您只能避免在配置类中声明的bean，但无法避免带有@Configuration注释的嵌套类，除非由a指定情况

例如如果my.property为false，下面的方法将避免将bean加载到ApplicationContext中p>

@Configuration
@ConditionalOnProperty(value = "my.property", havingValue = "true")
 public class MyConfiguration {

  @Bean
  public SubConfig1 getSubConfig1() {
     return new SubConfig1();
    }

  @Bean
  public SubConfig2 getSubConfig2() {
     return new SubConfig2();
    }

    static class SubConfig1 {
    }


   static class SubConfig2 {
   }


 }