[refactor] 이미지 업로드 방식 변경에 대한 post 도메인 수정#180

build.gradle.kts

@@ -50,6 +50,7 @@ dependencies {
 
     // AWS S3
     implementation("io.awspring.cloud:spring-cloud-aws-starter-s3:3.4.0")
+    implementation("com.amazonaws:aws-java-sdk-s3:1.12.777")
 
     runtimeOnly("com.h2database:h2")
     runtimeOnly("com.mysql:mysql-connector-j")

src/main/java/com/back/domain/myhistory/dto/MyHistoryLikedPostItemDto.java

@@ -1,8 +1,10 @@
 package com.back.domain.myhistory.dto;
 
 import com.back.domain.post.post.entity.Post;
+import com.back.domain.post.post.entity.PostImage;
 import com.back.domain.post.post.entity.PostLike;
 import java.time.LocalDateTime;
+import java.util.List;
 import lombok.Builder;
 import lombok.Getter;
 
@@ -11,7 +13,7 @@
 public class MyHistoryLikedPostItemDto {
     private Long id;
     private String title;
-    private String imageUrl;
+    private List<String> imageUrls;
     private LocalDateTime likedAt;
     private Integer likeCount;
     private Integer commentCount;
@@ -21,7 +23,9 @@ public static MyHistoryLikedPostItemDto from(PostLike pl) {
         return MyHistoryLikedPostItemDto.builder()
                 .id(p.getId())
                 .title(p.getTitle())
-                .imageUrl(p.getImageUrl())
+                .imageUrls(p.getImages().stream()
+                    .map(PostImage::getUrl)
+                    .toList())
                 .likedAt(pl.getCreatedAt())
                 .likeCount(p.getLikeCount())
                 .commentCount(p.getCommentCount())

src/main/java/com/back/domain/myhistory/dto/MyHistoryPostItemDto.java

@@ -1,6 +1,8 @@
 package com.back.domain.myhistory.dto;
 
 import com.back.domain.post.post.entity.Post;
+import com.back.domain.post.post.entity.PostImage;
+import java.util.List;
 import lombok.Builder;
 import lombok.Getter;
 
@@ -11,7 +13,7 @@
 public class MyHistoryPostItemDto {
     private Long id;
     private String title;
-    private String imageUrl;
+    private List<String> imageUrls;
     private LocalDateTime createdAt;
     private Integer likeCount;
     private Integer commentCount;
@@ -20,7 +22,9 @@ public static MyHistoryPostItemDto from(Post p) {
         return MyHistoryPostItemDto.builder()
                 .id(p.getId())
                 .title(p.getTitle())
-                .imageUrl(p.getImageUrl())
+                .imageUrls(p.getImages().stream()
+                    .map(PostImage::getUrl)
+                    .toList())
                 .createdAt(p.getCreatedAt())
                 .likeCount(p.getLikeCount())
                 .commentCount(p.getCommentCount())

src/main/java/com/back/domain/post/post/controller/PostController.java

@@ -8,10 +8,19 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.Valid;
-import lombok.RequiredArgsConstructor;
-import org.springframework.web.bind.annotation.*;
-
 import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
 
 @RestController
 @RequestMapping("/posts")
@@ -23,15 +32,18 @@ public class PostController {
 
   /**
    * 게시글 작성 API
+   *
    * @param reqBody 게시글 작성 요청 DTO
+   * @param images 첨부 이미지 파일들 (optional)
    * @return 작성된 게시글 정보
    */
-  @PostMapping
+  @PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
   @Operation(summary = "게시글 작성")
   public RsData<PostResponseDto> createPost(
-      @Valid @RequestBody PostCreateRequestDto reqBody
+      @RequestPart("post") @Valid PostCreateRequestDto reqBody,
+      @RequestPart(value = "images", required = false) List<MultipartFile> images
   ) {
-    return RsData.successOf(postService.createPost(reqBody)); // code=200, message="success"
+    return RsData.successOf(postService.createPost(reqBody, images)); // code=200, message="success"
   }
 
   /**
@@ -66,13 +78,14 @@ public RsData<PostResponseDto> getPost(
    * @param reqBody 게시글 수정 요청 DTO
    * @return 수정된 게시글 정보
    */
-  @PatchMapping("/{postId}")
+  @PatchMapping(value = "/{postId}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
   @Operation(summary = "게시글 수정")
   public RsData<PostResponseDto> updatePost(
       @PathVariable Long postId,
-      @Valid @RequestBody PostUpdateRequestDto reqBody
+      @RequestPart("post") @Valid PostUpdateRequestDto reqBody,
+      @RequestPart(value = "images", required = false) List<MultipartFile> images
   ) {
-    return RsData.successOf(postService.updatePost(postId, reqBody)); // code=200, message="success"
+    return RsData.successOf(postService.updatePost(postId, reqBody, images)); // code=200, message="success"
   }
 
   /**

src/main/java/com/back/domain/post/post/dto/request/PostCreateRequestDto.java

@@ -11,7 +11,6 @@ public record PostCreateRequestDto(
     String title,
     @NotBlank (message = "내용은 필수입니다.")
     String content,
-    String imageUrl,
     String videoUrl,
     List<String> tags
 ) {

src/main/java/com/back/domain/post/post/dto/request/PostUpdateRequestDto.java

@@ -8,7 +8,8 @@ public record PostUpdateRequestDto(
     PostStatus status,
     String title,
     String content,
-    String imageUrl,
+    // 기존 이미지 중 유지할 이미지 ID 목록
+    List<Long> keepImageIds,
     String videoUrl,
     List<String> tags
 ) {

src/main/java/com/back/domain/post/post/dto/response/PostResponseDto.java

@@ -1,6 +1,7 @@
 package com.back.domain.post.post.dto.response;
 
 import com.back.domain.post.post.entity.Post;
+import com.back.domain.post.post.entity.PostImage;
 import com.back.domain.post.post.enums.PostStatus;
 import java.time.LocalDateTime;
 import java.util.List;
@@ -14,7 +15,7 @@ public record PostResponseDto(
     PostStatus status,
     String title,
     String content,
-    String imageUrl,
+    List<String> imageUrls,
     String videoUrl,
     List<String> tags,
     Integer likeCount,
@@ -32,7 +33,9 @@ public PostResponseDto(Post post) {
         post.getStatus(),
         post.getTitle(),
         post.getContent(),
-        post.getImageUrl(),
+        post.getImages().stream()
+            .map(PostImage::getUrl)
+            .toList(),
         post.getVideoUrl(),
         post.getPostTags().stream()
             .map(postTag -> postTag.getTag().getName())

src/main/java/com/back/domain/post/post/entity/Post.java

@@ -1,6 +1,7 @@
 package com.back.domain.post.post.entity;
 
 import com.back.domain.post.category.entity.Category;
+import com.back.domain.post.comment.entity.Comment;
 import com.back.domain.post.post.enums.PostStatus;
 import com.back.domain.user.entity.User;
 import jakarta.persistence.*;
@@ -62,9 +63,14 @@ public class Post {
   @Column(name = "content", nullable = false, columnDefinition = "TEXT")
   private String content;
 
-  // 게시글 이미지 URL
-  @Column(name = "image_url")
-  private String imageUrl;
+  // Post → Comment = 1:N
+  @OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
+  private List<Comment> comments = new ArrayList<>();
+
+  // Post → PostImage = 1:N
+  @OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
+  @OrderBy("sortOrder ASC") // 조회 시 순서대로 정렬
+  private List<PostImage> images = new ArrayList<>();
 
   // 게시글 동영상 URL
   @Column(name = "video_url")
@@ -105,8 +111,12 @@ public void updateContent(String content) {
     this.content = content;
   }
 
-  public void updateImage(String imageUrl) {
-    this.imageUrl = imageUrl;
+  public void updateImages(List<PostImage> images) {
+    this.images.clear();
+    for (PostImage i : images) {
+      i.updatePost(this);
+      this.images.add(i);
+    }
   }
 
   public void updateVideo(String videoUrl) {

src/main/java/com/back/domain/post/post/entity/PostImage.java

@@ -0,0 +1,65 @@
+package com.back.domain.post.post.entity;
+
+import com.back.domain.post.post.enums.PostImageStatus;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+@Entity
+@Getter
+@EntityListeners(AuditingEntityListener.class)
+@NoArgsConstructor(access = lombok.AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Builder
+public class PostImage {
+
+  // 각 이미지를 구분하는 유일한 번호
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  @Column(name = "id")
+  private Long id;
+
+  // 해당 이미지가 첨부된 게시글의 고유 식별자
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "post_id")
+  private Post post;
+
+  // 이미지 파일 명
+  @Column(name = "file_name")
+  private String fileName;
+
+  // 이미지 URL
+  @Column(name = "url")
+  private String url;
+
+  // 이미지 삭제 상태 (기본값: 게시)
+  @Builder.Default
+  @Enumerated(EnumType.STRING)
+  @Column(name = "status", nullable = false)
+  private PostImageStatus status = PostImageStatus.POSTED;
+
+  // 이미지 순서
+  @Column(name = "sort_order")
+  private Integer sortOrder;
+
+  public void updatePost(Post post) {
+    this.post = post;
+  }
+
+  public void updateSortOrder(Integer sortOrder) {
+    this.sortOrder = sortOrder;
+  }
+}

src/main/java/com/back/domain/post/post/enums/PostImageStatus.java

@@ -0,0 +1,14 @@
+package com.back.domain.post.post.enums;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public enum PostImageStatus {
+  POSTED("게시", "이미지가 해당 게시물에 게시된 상태"),
+  DELETED("삭제", "이미지가 삭제 처리된 상태");
+
+  private final String title;
+  private final String description;
+}

src/main/java/com/back/domain/post/post/repository/PostImageRepository.java

@@ -0,0 +1,8 @@
+package com.back.domain.post.post.repository;
+
+import com.back.domain.post.post.entity.PostImage;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PostImageRepository extends JpaRepository<PostImage, Long> {
+
+}