feat: 전체 장르 목록 API 구현

Author: ys0221

src/main/java/com/back/web7_9_codecrete_be/domain/artists/controller/GenreController.java

@@ -0,0 +1,24 @@
+package com.back.web7_9_codecrete_be.domain.artists.controller;
+
+import com.back.web7_9_codecrete_be.domain.artists.dto.response.GenreResponse;
+import com.back.web7_9_codecrete_be.domain.artists.service.GenreService;
+import com.back.web7_9_codecrete_be.global.rsData.RsData;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/genre")
+@RequiredArgsConstructor
+public class GenreController {
+
+    private final GenreService genreService;
+
+    @GetMapping()
+    public RsData<List<GenreResponse>> genreList() {
+        return RsData.success("전체 장르 조회 성공", genreService.genreList());
+    }
+}

src/main/java/com/back/web7_9_codecrete_be/domain/artists/dto/response/GenreResponse.java

@@ -0,0 +1,15 @@
+package com.back.web7_9_codecrete_be.domain.artists.dto.response;
+
+import com.back.web7_9_codecrete_be.domain.artists.entity.Genre;
+
+public record GenreResponse(
+        Long genreId,
+        String genreName
+) {
+    public static GenreResponse from(Genre genre) {
+        return new GenreResponse(
+                genre.getId(),
+                genre.getGenreName()
+        );
+    }
+}

src/main/java/com/back/web7_9_codecrete_be/domain/artists/service/GenreService.java

@@ -1,12 +1,17 @@
 package com.back.web7_9_codecrete_be.domain.artists.service;
 
+import com.back.web7_9_codecrete_be.domain.artists.dto.response.ConcertListByArtistResponse;
+import com.back.web7_9_codecrete_be.domain.artists.dto.response.GenreResponse;
 import com.back.web7_9_codecrete_be.domain.artists.entity.Genre;
 import com.back.web7_9_codecrete_be.domain.artists.repository.GenreRepository;
+import com.back.web7_9_codecrete_be.domain.concerts.entity.Concert;
 import com.back.web7_9_codecrete_be.global.error.code.GenreErrorCode;
 import com.back.web7_9_codecrete_be.global.error.exception.BusinessException;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+
 @Service
 @RequiredArgsConstructor
 public class GenreService {
@@ -19,4 +24,11 @@ public Genre findByGenreName(String genreName) {
                 .orElseThrow(() -> new BusinessException(GenreErrorCode.GENRE_NOT_FOUND));
         return genre;
     }
+
+    public List<GenreResponse> genreList() {
+        List<Genre> genre = genreRepository.findAll();
+        return genre.stream()
+                .map(GenreResponse::from)
+                .toList();
+    }
 }