스프링 컨트롤러 연습

metaInterface.java

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ComApi {
    String path() default "/com";
}

SpringBootApp.java

@RequestMapping("/arahansa")
@RestController
static class TestController {
   List<String> list = Arrays.asList("test,1,2,3,4,5,6,7".split(","));

   // 접근가능한 주소 /arahansa/test
   @GetMapping("/test")
   public List<String> apiList() {
      return list;
   }

   // 접근 가능한 주소 /com/arahansa/test2, /arahansa/test2
   @ComApi
   @RequestMapping(value = "/test2", method = {RequestMethod.GET, RequestMethod.POST})
   public List<String> test2() {
      return list;
   }
}


@Configuration
static class MvcConfig extends WebMvcConfigurationSupport {

   @Bean
   @Override
   public RequestMappingHandlerMapping requestMappingHandlerMapping() {
      return new RequestMappingHandlerMapping(){
         @Override
         protected RequestMappingInfo getMappingForMethod(Method method, Class<?> handlerType) {
            RequestMappingInfo info = createRequestMappingInfo(method);

            if (info != null) {
               RequestMappingInfo typeInfo = this.createRequestMappingInfo(handlerType);
               if (typeInfo != null) {
                  info = typeInfo.combine(info);
               }
               ComApi comApi = AnnotatedElementUtils.findMergedAnnotation(method, ComApi.class);
               if (comApi != null) {

                  // RequestMappingInfo 두번째 생성자 인자에
                  // new PatternsRequestCondition(comApi.path(), "")
                  RequestMappingInfo info2 = new RequestMappingInfo(null, new PatternsRequestCondition(comApi.path(), ""), null, null, null, null, null, null);
                  RequestMappingInfo combine = info2.combine(info);
                  log.info("after combine webapi : {}", combine);
                  return combine;
               }
            }
            return info;
         }

         private RequestMappingInfo createRequestMappingInfo(AnnotatedElement element) {
            RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(element, RequestMapping.class);
            RequestCondition condition = element instanceof Class ? this.getCustomTypeCondition((Class) element) : this.getCustomMethodCondition((Method) element);
            return requestMapping != null ? this.createRequestMappingInfo(requestMapping, condition) : null;
         }
      };
   }
}