feat: 상품 등록 시 title에 대한 카테고리 추천 기능(랜덤으로 임시 구현)(#75)

be/src/main/java/com/secondhand/category/CategoryController.java

@@ -2,11 +2,14 @@
 
 import com.secondhand.category.dto.CategoriesDto;
 import com.secondhand.category.dto.CategoryInterestsDto;
+import com.secondhand.category.dto.PostTitleDto;
+import com.secondhand.category.dto.RecommendedCategoriesDto;
 import com.secondhand.post.repository.InterestRepository;
 import com.secondhand.util.CustomResponse;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
@@ -17,6 +20,7 @@ public class CategoryController {
 
     private final CategoryService categoryService;
     private final InterestRepository interestRepository;
+
     @GetMapping
     public ResponseEntity<CustomResponse<CategoriesDto>> getCategoryList() {
         return ResponseEntity
@@ -40,4 +44,19 @@ public ResponseEntity<CustomResponse<CategoryInterestsDto>> getInterestCategoryL
                         new CategoryInterestsDto(interestRepository.interestCategory()))
                 );
     }
+
+    @GetMapping("/recommend")
+    public ResponseEntity<CustomResponse<RecommendedCategoriesDto>> findRecommendedCategories(@RequestBody PostTitleDto postTitleDto) {
+
+
+
+        return ResponseEntity
+                .ok()
+                .body(new CustomResponse<>(
+                        "success",
+                        200,
+                        "관심 카테고리 목록 조회 성공",
+                        null)
+                );
+    }
 }

be/src/main/java/com/secondhand/category/CategoryService.java

@@ -1,10 +1,13 @@
 package com.secondhand.category;
 
 import com.secondhand.category.dto.CategoriesDto;
+import com.secondhand.category.dto.CategoryDto;
 import com.secondhand.post.repository.CategoryRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.*;
+
 @Service
 @RequiredArgsConstructor
 public class CategoryService {
@@ -15,4 +18,28 @@ public CategoriesDto getCategoryList() {
 
         return categoryRepository.findAllCategories();
     }
+
+    public CategoriesDto getRecommendedCategories() {
+
+        return recommendCategories(categoryRepository.findAllCategories().getCategories());
+    }
+
+    private CategoriesDto recommendCategories(List<CategoryDto> categories) {
+
+        List<CategoryDto> recommendedCategories = new ArrayList<>();
+
+        Random random = new Random();
+        Set<Integer> numbers = new HashSet<>();
+
+        while (numbers.size() < 3) {
+            int randomNumber = random.nextInt(categories.size() + 1);
+            numbers.add(randomNumber);
+        }
+
+        for (Integer number : numbers) {
+            recommendedCategories.add(categories.get(number));
+        }
+
+        return new CategoriesDto(recommendedCategories);
+    }
 }

be/src/main/java/com/secondhand/category/dto/CategoriesDto.java

@@ -3,7 +3,7 @@
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 
-import java.util.List;
+import java.util.*;
 
 @Getter
 @AllArgsConstructor

be/src/main/java/com/secondhand/category/dto/PostTitleDto.java

@@ -0,0 +1,9 @@
+package com.secondhand.category.dto;
+
+import lombok.Getter;
+
+@Getter
+public class PostTitleDto {
+
+    private String title;
+}

be/src/main/java/com/secondhand/category/dto/RecommendedCategoriesDto.java

@@ -0,0 +1,15 @@
+package com.secondhand.category.dto;
+
+import lombok.Getter;
+
+@Getter
+public class RecommendedCategoriesDto {
+
+    private int id;
+    private String name;
+
+    public RecommendedCategoriesDto(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+}