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Merge pull request #29 from StudyLink-SW-Project/feature/#27
[FEAT] #27 게시글 좋아요 기능 구현
2 parents 4da6e24 + 6055e26 commit 4c52264

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Lines changed: 217 additions & 19 deletions

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‎src/main/java/com/example/be/domain/Post.java‎

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import lombok.*;
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import java.time.LocalDateTime;
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import java.util.ArrayList;
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import java.util.List;
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@Entity
@@ -32,6 +33,9 @@ public class Post {
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@OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
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private List<Comment> comments;
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@OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
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private List<PostLike> likes = new ArrayList<>();
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@ManyToOne(fetch = FetchType.LAZY)
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@JoinColumn(name = "user_id")
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private User user;

‎src/main/java/com/example/be/domain/PostLike.java‎

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package com.example.be.domain;
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import jakarta.persistence.*;
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import lombok.*;
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import java.time.LocalDateTime;
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@Entity
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@Getter
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@Setter
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@Builder
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@NoArgsConstructor
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@AllArgsConstructor
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@Table(uniqueConstraints = {
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@UniqueConstraint(columnNames = {"user_id", "post_id"})
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})
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public class PostLike {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private Long id;
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@ManyToOne(fetch = FetchType.LAZY)
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@JoinColumn(name = "user_id")
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private User user;
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@ManyToOne(fetch = FetchType.LAZY)
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@JoinColumn(name = "post_id")
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private Post post;
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private LocalDateTime createDate;
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}

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

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package com.example.be.repository;
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import com.example.be.domain.Post;
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import com.example.be.domain.PostLike;
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import com.example.be.domain.User;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.data.jpa.repository.Query;
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import org.springframework.data.repository.query.Param;
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import java.util.Optional;
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public interface PostLikeRepository extends JpaRepository<PostLike, Long> {
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Optional<PostLike> findByUserAndPost(User user, Post post);
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boolean existsByUserAndPost(User user, Post post);
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long countByPost(Post post);
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@Query("SELECT COUNT(pl) FROM PostLike pl WHERE pl.post.id = :postId")
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long countByPostId(@Param("postId") Long postId);
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}

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

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@@ -13,7 +13,7 @@
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public interface PostRepository extends JpaRepository<Post, Long> {
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// PostRepository에 추가
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@Query("SELECT p FROM Post p LEFT JOIN FETCH p.comments ORDER BY p.createDate DESC")
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Page<Post> findAllWithCommentsOrderByCreateDateDesc(Pageable pageable);
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Page<Post> findAllByOrderByCreateDateDesc(Pageable pageable);
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// ID로 게시글 조회 (댓글 포함)
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@EntityGraph(attributePaths = {"comments", "comments.user", "user"})

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

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package com.example.be.service;
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import com.example.be.apiPayload.code.status.ErrorStatus;
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import com.example.be.apiPayload.exception.handler.UserHandler;
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import com.example.be.domain.Post;
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import com.example.be.domain.PostLike;
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import com.example.be.domain.User;
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import com.example.be.repository.PostLikeRepository;
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import com.example.be.repository.PostRepository;
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import com.example.be.repository.UserRepository;
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import com.example.be.web.dto.PostDTO;
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import jakarta.servlet.http.HttpServletRequest;
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import lombok.RequiredArgsConstructor;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import java.time.LocalDateTime;
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import java.util.Optional;
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import java.util.UUID;
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@Service
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@RequiredArgsConstructor
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public class PostLikeServiceImpl {
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private final JwtUtilServiceImpl jwtUtilService;
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private final UserRepository userRepository;
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private final PostRepository postRepository;
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private final PostLikeRepository postLikeRepository;
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@Transactional
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public PostDTO.PostLikeResponseDTO togglePostLike(Long postId, HttpServletRequest request) {
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// 토큰에서 사용자 정보 가져오기
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String accessToken = jwtUtilService.extractTokenFromCookie(request, "accessToken");
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if (accessToken == null) {
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throw new UserHandler(ErrorStatus._NOT_FOUND_USER);
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}
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String userId = jwtUtilService.getUserIdFromToken(accessToken);
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User user = userRepository.findByUserId(UUID.fromString(userId))
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.orElseThrow(() -> new UserHandler(ErrorStatus._NOT_FOUND_USER));
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// 게시글 정보 가져오기
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Post post = postRepository.findById(postId)
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.orElseThrow(() -> new UserHandler(ErrorStatus._NOT_FOUND_POST));
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// 이미 좋아요를 눌렀는지 확인
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Optional<PostLike> existingLike = postLikeRepository.findByUserAndPost(user, post);
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boolean isLiked;
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if (existingLike.isPresent()) {
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// 좋아요가 이미 있으면 삭제 (좋아요 취소)
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postLikeRepository.delete(existingLike.get());
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isLiked = false;
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} else {
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// 좋아요가 없으면 추가
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PostLike postLike = PostLike.builder()
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.user(user)
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.post(post)
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.createDate(LocalDateTime.now())
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.build();
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postLikeRepository.save(postLike);
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isLiked = true;
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}
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// 좋아요 수 조회
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long likeCount = postLikeRepository.countByPost(post);
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return PostDTO.PostLikeResponseDTO.builder()
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.postId(postId)
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.liked(isLiked)
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.likeCount(likeCount)
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.build();
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}
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// 특정 게시글에 대한 사용자의 좋아요 여부 확인
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public boolean isPostLikedByUser(Post post, User user) {
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return postLikeRepository.existsByUserAndPost(user, post);
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}
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// 특정 게시글의 좋아요 수 조회
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public long getPostLikeCount(Post post) {
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return postLikeRepository.countByPost(post);
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}
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// 특정 게시글 ID의 좋아요 수 조회
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public long getPostLikeCount(Long postId) {
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return postLikeRepository.countByPostId(postId);
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}
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}

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

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@@ -31,9 +31,11 @@ public class PostServiceImpl {
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private final JwtUtilServiceImpl jwtUtilService;
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private final UserRepository userRepository;
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private final PostRepository postRepository;
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private final PostLikeServiceImpl postLikeService;
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public CommonDTO.IsSuccessDTO write(PostDTO.postRequestDTO request, HttpServletRequest req) {
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//글 작성 메서드
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public CommonDTO.IsSuccessDTO write(PostDTO.postRequestDTO request, HttpServletRequest req) {
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String accessToken = jwtUtilService.extractTokenFromCookie(req, "accessToken");
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// 토큰이 없는 경우 처리
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public PostDTO.PageResponseDTO getPosts(int page, int size) {
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Pageable pageable = PageRequest.of(page, size);
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Page<Post> postPage = postRepository.findAllWithCommentsOrderByCreateDateDesc(pageable);
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Page<Post> postPage = postRepository.findAllByOrderByCreateDateDesc(pageable);
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List<PostDTO.postResponseDTO> postDtoList = postPage.getContent().stream()
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.map(post -> PostDTO.postResponseDTO.builder()
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.userName(post.getUser().getName())
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.createDate(post.getCreateDate().toLocalDate())
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.isDone(post.isDone())
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// 댓글 개수 추가
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.commentCount(post.getComments() != null ? post.getComments().size() : 0)
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.likeCount(postLikeService.getPostLikeCount(post))
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.build())
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.collect(Collectors.toList());
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}
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// 게시글 상세 조회 메서드
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public PostDTO.PostDetailResponseDTO getPostDetail(Long postId) {
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public PostDTO.PostDetailResponseDTO getPostDetail(Long postId, HttpServletRequest request) {
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Post post = postRepository.findById(postId)
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.orElseThrow(() -> new UserHandler(ErrorStatus._NOT_FOUND_POST));
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// 현재 로그인한 사용자 정보 가져오기 (좋아요 여부 확인용)
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User currentUser = null;
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boolean isLiked = false;
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try {
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String accessToken = jwtUtilService.extractTokenFromCookie(request, "accessToken");
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if (accessToken != null) {
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String userId = jwtUtilService.getUserIdFromToken(accessToken);
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currentUser = userRepository.findByUserId(UUID.fromString(userId)).orElse(null);
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// 현재 사용자가 이 게시글에 좋아요를 눌렀는지 확인
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if (currentUser != null) {
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isLiked = postLikeService.isPostLikedByUser(post, currentUser);
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}
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}
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} catch (Exception e) {
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// 비로그인 사용자도 게시글을 볼 수 있도록 예외를 무시하고 진행
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}
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// 댓글 목록 변환
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List<PostDTO.CommentResponseDTO> commentDtoList = post.getComments().stream()
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.map(comment -> PostDTO.CommentResponseDTO.builder()
@@ -104,6 +125,9 @@ public PostDTO.PostDetailResponseDTO getPostDetail(Long postId) {
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.build())
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.collect(Collectors.toList());
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// 좋아요 수 조회
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long likeCount = postLikeService.getPostLikeCount(post);
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// 게시글 상세 정보 변환
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return PostDTO.PostDetailResponseDTO.builder()
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.id(post.getId())
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.isDone(post.isDone())
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.commentCount(commentDtoList.size())
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.comments(commentDtoList)
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// 좋아요 정보 추가
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.likeCount(likeCount)
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.liked(isLiked)
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.build();
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}
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}

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

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import com.example.be.domain.User;
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import com.example.be.repository.UserRepository;
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import com.example.be.service.JwtUtilServiceImpl;
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import com.example.be.service.PostLikeServiceImpl;
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import com.example.be.service.PostServiceImpl;
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import com.example.be.service.UserServiceImpl;
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import com.example.be.web.dto.CommonDTO;
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import com.example.be.web.dto.PostDTO;
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import com.example.be.web.dto.UserDTO;
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public class PostController {
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private final PostServiceImpl postService;
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private final PostLikeServiceImpl postLikeService;
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@PostMapping("/write")
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@Operation(summary = "게시글 작성 API")
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@GetMapping("/{postId}")
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@Operation(summary = "게시글 상세 조회 API", description = "게시글 ID로 게시글 상세 정보와 댓글 목록을 조회합니다.")
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public ApiResponse<PostDTO.PostDetailResponseDTO> getPostDetail(
45-
@Parameter(description = "게시글 ID") @PathVariable Long postId) {
46-
return ApiResponse.onSuccess(postService.getPostDetail(postId));
48+
@Parameter(description = "게시글 ID") @PathVariable Long postId,
49+
HttpServletRequest request) {
50+
return ApiResponse.onSuccess(postService.getPostDetail(postId, request));
51+
}
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// 좋아요 토글 API 추가
54+
@PostMapping("/{postId}/like")
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@Operation(summary = "게시글 좋아요 토글 API", description = "게시글에 좋아요를 누르거나 취소합니다.")
56+
public ApiResponse<PostDTO.PostLikeResponseDTO> togglePostLike(
57+
@Parameter(description = "게시글 ID") @PathVariable Long postId,
58+
HttpServletRequest request) {
59+
return ApiResponse.onSuccess(postLikeService.togglePostLike(postId, request));
4760
}
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}

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

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@AllArgsConstructor
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@Schema(title = "COMMON_RES_06 : API 실행 성공 여부 응답 DTO")
1515
public static class IsSuccessDTO{
16-
Boolean isSuccess;
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private Boolean isSuccess;
1717
}
1818
}

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

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1919
@AllArgsConstructor
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2121
public static class postRequestDTO{
22-
String title;
23-
String content;
22+
private String title;
23+
private String content;
2424
}
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2626
@Builder
2727
@Getter
2828
@NoArgsConstructor
2929
@AllArgsConstructor
3030
public static class postResponseDTO {
31-
Long id;
32-
String title;
33-
String content;
34-
String userName;
31+
private Long id;
32+
private String title;
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private String content;
34+
private String userName;
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private long likeCount;
3536
@JsonFormat(pattern = "yyyy-MM-dd")
36-
LocalDate createDate;
37-
int commentCount;
38-
boolean isDone;
37+
private LocalDate createDate;
38+
private int commentCount;
39+
private boolean isDone;
3940
}
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4142
@Builder
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7879
private String title;
7980
private String content;
8081
private String userName;
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private long likeCount;
83+
private boolean liked;
8284
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
8385
private LocalDateTime createDate;
84-
8586
private boolean isDone;
8687
private int commentCount;
8788
private List<CommentResponseDTO> comments;
8889
}
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91+
@Builder
92+
@Getter
93+
@NoArgsConstructor
94+
@AllArgsConstructor
95+
@Schema(description = "게시글 좋아요 응답 DTO")
96+
public static class PostLikeResponseDTO {
97+
private Long postId;
98+
private boolean liked;
99+
private long likeCount;
100+
}
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}

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