[feat]Post

src/main/java/com/TwinStar/TwinStar/post/controller/PostController.java

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+package com.TwinStar.TwinStar.post.controller;
+
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/posts")
+public class PostController {
+
+    // 게시글 목록 조회
+    @GetMapping
+    public ResponseEntity<List<PostListRes>> getAllPosts() {
+        List<PostListRes> posts = postService.getAllPosts();
+        return ResponseEntity.ok(posts);
+    }
+
+    // 게시글 상세 조회
+    @GetMapping("/{id}")
+    public ResponseEntity<PostDetailRes> getPost(@PathVariable Long id) {
+        PostDetailRes post = postService.getPost(id);
+        return ResponseEntity.ok(post);
+    }
+
+    // 게시글 작성
+    @PostMapping
+    public ResponseEntity<PostDetailRes> createPost(@RequestBody PostCreateReq request) {
+        PostDetailRes createdPost = postService.createPost(request);
+        return ResponseEntity.status(HttpStatus.CREATED).body(createdPost);
+    }
+
+    // 게시글 수정
+    @PutMapping("/{id}")
+    public ResponseEntity<PostDetailRes> updatePost(@PathVariable Long id, @RequestBody PostUpdateReq request) {
+        PostDetailRes updatedPost = postService.updatePost(id, request);
+        return ResponseEntity.ok(updatedPost);
+    }
+
+    // 게시글 삭제
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deletePost(@PathVariable Long id) {
+        postService.deletePost(id);
+        return ResponseEntity.noContent().build();
+    }
+}

src/main/java/com/TwinStar/TwinStar/post/domain/Post.java

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+package com.TwinStar.TwinStar.post.domain;
+
+import jakarta.persistence.*;
+import jakarta.transaction.Transactional;
+import lombok.*;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Getter
+@Builder
+@ToString
+@Entity
+@Transactional
+public class Post extends BaseTimeEntity{
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(length = 3000)
+    private String contents;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Column(name = "group_id")
+    private Long groupId;
+
+    @Column(name = "share_post_id")
+    private Long sharePostId;
+
+    @Column(name = "post_visibility")
+    @Enumerated(EnumType.STRING)
+    private Enum postVisibility;
+
+    @Column(name = "post_del")
+    private int postDel;
+
+    @Column(name = "score")
+    private Long score;
+
+    @Column(name = "hot_issue_yn")
+    private int hotIssueYn;
+
+    public PostListRes postListFromEntity(){
+        return PostListRes.builder()
+                .id(this.id)
+                .userNickname(this.user.getNickname())
+                .build();
+    }
+
+    public PostDetailRes detailFromEntity(){
+        return PostDetailRes.builder()
+                .id(this.id)
+                .contents(this.contents)
+                .userNickname(this.user.getNickname())
+                .createdTime(this.getCreatedTime())
+                .updatedTime(this.getUpdatedTime())
+                .build();
+    }
+}

src/main/java/com/TwinStar/TwinStar/post/dtos/PostCreateReq.java

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+package com.TwinStar.TwinStar.post.dtos;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Data
+public class PostCreateReq {
+    private String content;
+    private String file;
+    private 
+
+
+    public Post toEntity(User user) {
+        return Post.builder()
+                .content(content)
+                .file(file)
+                .user(user.getNickname())
+                .build();
+    }
+
+}

src/main/java/com/TwinStar/TwinStar/post/dtos/PostDetailRes.java

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+package com.TwinStar.TwinStar.post.dtos;
+
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Data
+@Builder
+public class PostDetailRes {
+    private Long id;
+    private String contents;
+    private String user;
+    private Long groupId;
+    private Long sharePostId;
+    private Enum postVisibility;
+    private int postDel;
+    private Long score;
+    private int hotIssueYn;
+}

src/main/java/com/TwinStar/TwinStar/post/repository/PostRepository.java

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+package com.TwinStar.TwinStar.post.repository;
+
+
+import com.TwinStar.TwinStar.post.domain.Post;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.Query;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public interface PostRepository {
+
+    // 제목으로 게시글 검색
+    List<Post> findByTitleContaining(String title);
+
+    // 작성자로 게시글 검색
+    List<Post> findByAuthor(String author);
+
+    // 카테고리별 게시글 검색
+    List<Post> findByCategory(String category);
+
+    // 최신 게시글 n개 조회
+    @Query("SELECT p FROM Post p ORDER BY p.createdAt DESC")
+    List<Post> findLatestPosts(Pageable pageable);
+
+    // 조회수 기준 인기 게시글
+    @Query("SELECT p FROM Post p ORDER BY p.viewCount DESC")
+    List<Post> findPopularPosts(Pageable pageable);
+
+    // 특정 기간 내의 게시글 검색
+    List<Post> findByCreatedAtBetween(LocalDateTime start, LocalDateTime end);
+}
+

src/main/java/com/TwinStar/TwinStar/post/service/PostService.java

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+package com.TwinStar.TwinStar.post.service;
+
+import com.TwinStar.TwinStar.post.dtos.PostCreateReq;
+import com.TwinStar.TwinStar.post.repository.PostRepository;
+import jakarta.persistence.EntityNotFoundException;
+import jakarta.transaction.Transactional;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+
+@Service
+@Transactional
+public class PostService {
+    private final PostRepository postRepository;
+    private final userRepository userRepository;
+
+    public PostService(PostRepository postRepository, userRepository userRepository) {
+        this.postRepository = postRepository;
+        this.userRepository = userRepository;
+    }
+
+    public void save(PostCreateReq postCreateReq, UserRepository userRepository){
+        String Nickname = SecurityContextHolder.getContext().getAuthentication().getName();
+        User user = userRepository.findByNickname(nickname).orElseThrow(()->new EntityNotFoundException("존재하지 않는 유저 입니다."));
+        LocalDateTime appointmentTime = null;
+    }
+}