Springboot自定义Enable基于接口的实现

1. 编写configuration

   @Configuration
   public class HelloWorldConfiguration {
         
         
       @Bean
       public String helloWorld(){
         
         
           return "Hello, yicj" ;
       }
   }
   

2. 编写EnableXXX导入配置类
   • 直接导入配置类（方式一）

     @Documented
     @Retention(RetentionPolicy.RUNTIME)
     @Target(ElementType.TYPE)
     @Import(HelloWorldConfiguration.class)
     public @interface EnableHelloWorld {
             
             
     }
     

   • 通过ImportSelector导入配置类（方式二）

     public class HelloWorldImportSelector implements ImportSelector {
             
             
         @Override
         public String[] selectImports(AnnotationMetadata importingClassMetadata) {
             
             
             return new String[]{
             
             HelloWorldConfiguration.class.getName()};
         }
     }
     @Documented
     @Retention(RetentionPolicy.RUNTIME)
     @Target(ElementType.TYPE)
     @Import(HelloWorldImportSelector.class)
     public @interface EnableHelloWorld {
             
             
     }
     

3. 启动类编写,导入EnableXXX注解类

   @Slf4j
   @EnableHelloWorld
   public class EnableHelloWorldBootstrap {
         
         
       public static void main(String[] args) {
         
         
           ConfigurableApplicationContext ctx = new SpringApplicationBuilder(EnableHelloWorldBootstrap.class)
                   .web(WebApplicationType.NONE)
                   .run(args);
           String bean = ctx.getBean("helloWorld", String.class);
           log.info("=====> bean : {}", bean);
           ctx.close();
       }
   }