[Feat]: 게시글 목록 페이징 기능 추가

Author: shihan00321

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

@@ -4,8 +4,11 @@
 import com.back.domain.post.dto.PostResponse;
 import com.back.domain.post.service.PostService;
 import com.back.global.common.ApiResponse;
+import com.back.global.common.PageResponse;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
@@ -28,14 +31,14 @@ public ApiResponse<PostResponse> createPost(
             @RequestBody @Valid PostRequest request) {
         Long userId = 1L; // fixme 임시 사용자 ID
         PostResponse response = postService.createPost(userId, request);
-        return ApiResponse.success(response, "성공적으로 생성되었습니다.", HttpStatus.CREATED);
+        return ApiResponse.success(response, "성공적으로 생성되었습니다.", HttpStatus.OK);
     }
 
     // 게시글 목록 조회
     @GetMapping
-    public ApiResponse<List<PostResponse>> getPosts() {
-        List<PostResponse> responses = postService.getPosts();
-        return ApiResponse.success(responses, "성공적으로 조회되었습니다.", HttpStatus.OK);
+    public ApiResponse<PageResponse<PostResponse>> getPosts(Pageable pageable) {
+        Page<PostResponse> responses = postService.getPosts(pageable);
+        return ApiResponse.success(PageResponse.of(responses), "성공적으로 조회되었습니다.", HttpStatus.OK);
     }
 
     // 게시글 단건 조회

back/src/main/java/com/back/domain/post/service/PostService.java

@@ -10,6 +10,8 @@
 import com.back.global.exception.ApiException;
 import com.back.global.exception.ErrorCode;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -46,13 +48,9 @@ public PostResponse getPost(Long postId) {
                 .orElseThrow(() -> new ApiException(ErrorCode.POST_NOT_FOUND));
     }
 
-    public List<PostResponse> getPosts() {
-        List<Post> posts = postRepository.findAll()
-                .stream()
-                .filter(post -> !post.isHide())
-                .toList();
-
-        return PostMapper.toResponseList(posts);
+    public Page<PostResponse> getPosts(Pageable pageable) {
+        return postRepository.findAll(pageable)
+                .map(PostMapper::toResponse);
     }
 
     @Transactional

back/src/main/java/com/back/global/common/PageResponse.java

@@ -0,0 +1,29 @@
+package com.back.global.common;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.data.domain.Page;
+
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+public class PageResponse<T> {
+    private List<T> items;
+    private int page;
+    private int size;
+    private long totalElements;
+    private int totalPages;
+    private boolean last;
+
+    public static <T> PageResponse<T> of(Page<T> page) {
+        return new PageResponse<>(
+                page.getContent(),
+                page.getNumber() + 1, // 응답도 1페이지 시작으로 반환, Page 객체는 0페이지부터 시작
+                page.getSize(),
+                page.getTotalElements(),
+                page.getTotalPages(),
+                page.isLast()
+        );
+    }
+}