[FEAT] #21 게시글 목록 조회 기능 구현

src/main/java/com/example/be/repository/PostRepository.java

@@ -1,7 +1,14 @@
 package com.example.be.repository;
 
 import com.example.be.domain.Post;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
 
 public interface PostRepository extends JpaRepository<Post, Long> {
-}
+    // PostRepository에 추가
+    @Query("SELECT p FROM Post p LEFT JOIN FETCH p.comments ORDER BY p.createDate DESC")
+    Page<Post> findAllWithCommentsOrderByCreateDateDesc(Pageable pageable);}

src/main/java/com/example/be/service/PostServiceImpl.java

@@ -14,10 +14,15 @@
 import jakarta.servlet.http.HttpServletRequest;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDateTime;
+import java.util.List;
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 
 @Service
@@ -55,4 +60,32 @@ public CommonDTO.IsSuccessDTO write(PostDTO.postRequestDTO request, HttpServletR
 
         return CommonDTO.IsSuccessDTO.builder().isSuccess(true).build();
     }
+
+    // 페이지네이션을 활용한 게시글 조회 메서드 추가
+    public PostDTO.PageResponseDTO getPosts(int page, int size) {
+        Pageable pageable = PageRequest.of(page, size);
+        Page<Post> postPage = postRepository.findAllWithCommentsOrderByCreateDateDesc(pageable);
+
+        List<PostDTO.postResponseDTO> postDtoList = postPage.getContent().stream()
+                .map(post -> PostDTO.postResponseDTO.builder()
+                        .id(post.getId())
+                        .title(post.getTitle())
+                        .content(post.getContent())
+                        .userName(post.getUser().getName())
+                        .createDate(post.getCreateDate().toLocalDate())
+                        .isDone(post.isDone())
+                        // 댓글 개수 추가
+                        .commentCount(post.getComments() != null ? post.getComments().size() : 0)
+                        .build())
+                .collect(Collectors.toList());
+
+        return PostDTO.PageResponseDTO.builder()
+                .posts(postDtoList)
+                .currentPage(postPage.getNumber())
+                .totalPages(postPage.getTotalPages())
+                .totalElements(postPage.getTotalElements())
+                .first(postPage.isFirst())
+                .last(postPage.isLast())
+                .build();
+    }
 }

src/main/java/com/example/be/web/controller/PostController.java

@@ -11,10 +11,13 @@
 import com.example.be.web.dto.PostDTO;
 import com.example.be.web.dto.UserDTO;
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
 import jakarta.servlet.http.HttpServletRequest;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
+
 @RestController
 @RequestMapping("/post")
 @RequiredArgsConstructor
@@ -29,4 +32,12 @@ public ApiResponse<CommonDTO.IsSuccessDTO> write(@RequestBody PostDTO.postReques
         return ApiResponse.onSuccess(postService.write(request, req));
     }
 
+    @GetMapping("/list")
+    @Operation(summary = "게시글 목록 조회 API (페이지네이션)", description = "15개씩 페이지네이션하여 게시글 목록을 조회합니다.")
+    public ApiResponse<PostDTO.PageResponseDTO> getPosts(
+            @Parameter(description = "페이지 번호 (0부터 시작)") @RequestParam(defaultValue = "0") int page) {
+        return ApiResponse.onSuccess(postService.getPosts(page, 4)); // 4개씩 페이지네이션
+    }
+
+
 }

src/main/java/com/example/be/web/dto/PostDTO.java

@@ -1,12 +1,14 @@
 package com.example.be.web.dto;
 
+import com.fasterxml.jackson.annotation.JsonFormat;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.Date;
 import java.util.List;
 
@@ -25,17 +27,27 @@ public static class postRequestDTO{
     @NoArgsConstructor
     @AllArgsConstructor
     public static class postResponseDTO {
+        Long id;
         String title;
         String content;
-        String user;
-        LocalDate date;
+        String userName;
+        @JsonFormat(pattern = "yyyy-MM-dd")
+        LocalDate createDate;
+        int commentCount;
+        boolean isDone;
     }
 
     @Builder
     @Getter
     @NoArgsConstructor
     @AllArgsConstructor
-    public static class postListResponseDTO{
-        List<postResponseDTO> postList;
+    @Schema(description = "게시글 페이지네이션 응답 DTO")
+    public static class PageResponseDTO {
+        private List<postResponseDTO> posts;
+        private int currentPage;
+        private int totalPages;
+        private long totalElements;
+        private boolean first;
+        private boolean last;
     }
 }