diff --git a/src/main/java/com/example/springhw32/controller/CommentController.java b/src/main/java/com/example/springhw32/controller/CommentController.java
index 0ee065d..b446148 100644
--- a/src/main/java/com/example/springhw32/controller/CommentController.java
+++ b/src/main/java/com/example/springhw32/controller/CommentController.java
@@ -1,5 +1,31 @@
 package com.example.springhw32.controller;
 
+import com.example.springhw32.dto.CommentDto;
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.entity.User;
+import com.example.springhw32.service.CommentService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("/posts/comments")
 public class CommentController {
+    private final CommentService commentService;
+    @PostMapping("")
+    public CommentDto createComments(@ModelAttribute CommentDto commentDto,Long userId, Long postId){
+
+        return commentService.createComments(commentDto,userId,postId);
+    }
+
+    @GetMapping("/{postId}")
+    public List<CommentDto> getCommentsByPostId(@PathVariable Long postId){
+        return commentService.getCommentsByPostId(postId);
+
+    }
+
+
 
 }
diff --git a/src/main/java/com/example/springhw32/controller/PostController.java b/src/main/java/com/example/springhw32/controller/PostController.java
index 317774b..0c3b960 100644
--- a/src/main/java/com/example/springhw32/controller/PostController.java
+++ b/src/main/java/com/example/springhw32/controller/PostController.java
@@ -1,5 +1,47 @@
 package com.example.springhw32.controller;
 
+import com.example.springhw32.dto.CommentDto;
+import com.example.springhw32.dto.PostDto;
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.service.PostService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("/posts")
 public class PostController {
+    private final PostService postService;
+
+    @PostMapping("")
+    public PostDto create(Long userId,
+                          @ModelAttribute PostDto postDto){
+        return postService.create(userId,postDto);
+    }
+
+    @GetMapping("")
+    public List<PostDto> getRecentPosts(){
+
+        return postService.getRecentPosts();
+
+    }
+
+    @GetMapping("/{writer}")
+    public List<PostDto> getPostsByWriter(@PathVariable("writer")String nickName){
+        return postService.getPostsByWriter(nickName);
+
+
+    }
+
+    @GetMapping("/comments")
+    public List<PostDto> getPopularPosts(){
+
+        return postService.getPopularPosts();
+    }
+
+
+
 
 }
diff --git a/src/main/java/com/example/springhw32/controller/UserController.java b/src/main/java/com/example/springhw32/controller/UserController.java
index 3b321ac..94712ba 100644
--- a/src/main/java/com/example/springhw32/controller/UserController.java
+++ b/src/main/java/com/example/springhw32/controller/UserController.java
@@ -1,5 +1,20 @@
 package com.example.springhw32.controller;
 
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.service.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+@RequiredArgsConstructor
+@RestController
 public class UserController {
+    private final UserService userService;
+    @PostMapping("/users")
+    public UserDto join(@ModelAttribute UserDto userDto){
+        return userService.join(userDto);
+    }
+
+
 
 }
diff --git a/src/main/java/com/example/springhw32/dto/CommentDto.java b/src/main/java/com/example/springhw32/dto/CommentDto.java
index a9d04fa..febd08c 100644
--- a/src/main/java/com/example/springhw32/dto/CommentDto.java
+++ b/src/main/java/com/example/springhw32/dto/CommentDto.java
@@ -1,5 +1,29 @@
 package com.example.springhw32.dto;
 
+import com.example.springhw32.entity.Comment;
+import com.example.springhw32.entity.Post;
+import com.example.springhw32.entity.User;
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
 public class CommentDto {
+    public CommentDto(Comment comment) {
+        this.post = comment.getPost();
+        this.user = comment.getUser();
+        this.text = comment.getText();
+
+
+    }
+
+    @ManyToOne
+    private Post post;
+
+    @OneToOne
+    private User user;
+
+    private String text;
 
 }
diff --git a/src/main/java/com/example/springhw32/dto/PostDto.java b/src/main/java/com/example/springhw32/dto/PostDto.java
index cde1eda..5f9a234 100644
--- a/src/main/java/com/example/springhw32/dto/PostDto.java
+++ b/src/main/java/com/example/springhw32/dto/PostDto.java
@@ -1,5 +1,32 @@
 package com.example.springhw32.dto;
 
+import com.example.springhw32.entity.Post;
+import com.example.springhw32.entity.User;
+import jakarta.persistence.ManyToOne;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Setter
+@AllArgsConstructor
 public class PostDto {
+    public PostDto(Post post) {
+        this.user = post.getUser();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.commentCnt = post.getCommentCnt();
+        this.createdAt = post.getCreatedAt();
+
+    }
+    @ManyToOne
+    private User user;
+
+    private String title;
+    private String content;
+    private Long commentCnt;
+    private LocalDateTime createdAt;
 
 }
diff --git a/src/main/java/com/example/springhw32/dto/UserDto.java b/src/main/java/com/example/springhw32/dto/UserDto.java
index cbbbe2e..eceffb0 100644
--- a/src/main/java/com/example/springhw32/dto/UserDto.java
+++ b/src/main/java/com/example/springhw32/dto/UserDto.java
@@ -1,5 +1,14 @@
 package com.example.springhw32.dto;
 
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
 public class UserDto {
 
+    private String username;
+    private String password;
+    private String nickname;
+
 }
diff --git a/src/main/java/com/example/springhw32/entity/Comment.java b/src/main/java/com/example/springhw32/entity/Comment.java
index be818a0..8672f5d 100644
--- a/src/main/java/com/example/springhw32/entity/Comment.java
+++ b/src/main/java/com/example/springhw32/entity/Comment.java
@@ -1,5 +1,24 @@
 package com.example.springhw32.entity;
 
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.IdGeneratorType;
+@Getter
+@Setter
+@Entity
 public class Comment {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @ManyToOne
+    private Post post;
+
+    @OneToOne
+    private User user;
+
+    private String text;
+
 
 }
diff --git a/src/main/java/com/example/springhw32/entity/Post.java b/src/main/java/com/example/springhw32/entity/Post.java
index 38b5e81..938e280 100644
--- a/src/main/java/com/example/springhw32/entity/Post.java
+++ b/src/main/java/com/example/springhw32/entity/Post.java
@@ -1,5 +1,25 @@
 package com.example.springhw32.entity;
 
+import jakarta.persistence.*;
+import lombok.*;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Setter
+@Entity
 public class Post {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    @ManyToOne
+    private User user;
+
+    private String title;
+    private String content;
+
+    private Long commentCnt;
+    private LocalDateTime createdAt;
 
 }
diff --git a/src/main/java/com/example/springhw32/entity/User.java b/src/main/java/com/example/springhw32/entity/User.java
index 447989d..e5c92bc 100644
--- a/src/main/java/com/example/springhw32/entity/User.java
+++ b/src/main/java/com/example/springhw32/entity/User.java
@@ -1,5 +1,22 @@
 package com.example.springhw32.entity;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@Entity
 public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String username;
+    private String password;
+    private String nickname;
 
 }
diff --git a/src/main/java/com/example/springhw32/repository/CommentRepository.java b/src/main/java/com/example/springhw32/repository/CommentRepository.java
index 83dcd99..66c0cd6 100644
--- a/src/main/java/com/example/springhw32/repository/CommentRepository.java
+++ b/src/main/java/com/example/springhw32/repository/CommentRepository.java
@@ -1,5 +1,13 @@
 package com.example.springhw32.repository;
 
-public interface CommentRepository {
+import com.example.springhw32.entity.Comment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface CommentRepository extends JpaRepository<Comment,Long> {
+    List<Comment> findAllByPostId(Long postId);
 
 }
diff --git a/src/main/java/com/example/springhw32/repository/PostRepository.java b/src/main/java/com/example/springhw32/repository/PostRepository.java
index 14b8546..d3340e8 100644
--- a/src/main/java/com/example/springhw32/repository/PostRepository.java
+++ b/src/main/java/com/example/springhw32/repository/PostRepository.java
@@ -1,5 +1,14 @@
 package com.example.springhw32.repository;
 
-public interface PostRepository {
+import com.example.springhw32.entity.Post;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
+@Repository
+public interface PostRepository extends JpaRepository<Post,Long> {
+    List<Post> findAllByOrderByCreatedAtDesc();
+    List<Post> findAllByUserId(Long userId);
+    List<Post> findAllByOrderByCommentCntDesc();
 }
diff --git a/src/main/java/com/example/springhw32/repository/UserRepository.java b/src/main/java/com/example/springhw32/repository/UserRepository.java
index 877a215..f4f9ea5 100644
--- a/src/main/java/com/example/springhw32/repository/UserRepository.java
+++ b/src/main/java/com/example/springhw32/repository/UserRepository.java
@@ -1,5 +1,13 @@
 package com.example.springhw32.repository;
 
-public interface UserRepository {
+import com.example.springhw32.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public interface UserRepository extends JpaRepository<User,Long> {
+    User findByNickname(String nickname);
 
 }
diff --git a/src/main/java/com/example/springhw32/service/CommentService.java b/src/main/java/com/example/springhw32/service/CommentService.java
index ec0c937..92f868b 100644
--- a/src/main/java/com/example/springhw32/service/CommentService.java
+++ b/src/main/java/com/example/springhw32/service/CommentService.java
@@ -1,5 +1,50 @@
 package com.example.springhw32.service;
 
+import com.example.springhw32.dto.CommentDto;
+import com.example.springhw32.dto.PostDto;
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.entity.Comment;
+import com.example.springhw32.entity.Post;
+import com.example.springhw32.entity.User;
+import com.example.springhw32.repository.CommentRepository;
+import com.example.springhw32.repository.PostRepository;
+import com.example.springhw32.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RequiredArgsConstructor
+@Service
+@Transactional
 public class CommentService {
+    private final CommentRepository commentRepository;
+    private final UserRepository userRepository;
+    private final PostRepository postRepository;
+
+    //댓글 작성
+    public CommentDto createComments(CommentDto commentDto, Long userId, Long postId){
+        User user = userRepository.findById(userId).orElseThrow();
+        Post post = postRepository.findById(postId).orElseThrow();
+
+        Comment comment = new Comment();
+        comment.setText(commentDto.getText());
+        comment.setPost(post);
+        comment.setUser(user);
+        commentRepository.save(comment);
+
+        return commentDto;
+
+    }
+    //특정게시물의 모든댓글 조회
+    public List<CommentDto> getCommentsByPostId(Long postId){
+        return commentRepository.findAllByPostId(postId).stream()
+                .map(CommentDto::new)
+                .collect(Collectors.toList());
+
+
+    }
 
 }
diff --git a/src/main/java/com/example/springhw32/service/PostService.java b/src/main/java/com/example/springhw32/service/PostService.java
index b029d55..03ee8d6 100644
--- a/src/main/java/com/example/springhw32/service/PostService.java
+++ b/src/main/java/com/example/springhw32/service/PostService.java
@@ -1,5 +1,73 @@
 package com.example.springhw32.service;
 
+import com.example.springhw32.dto.PostDto;
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.entity.Post;
+import com.example.springhw32.entity.User;
+import com.example.springhw32.repository.PostRepository;
+import com.example.springhw32.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RequiredArgsConstructor
+@Service
 public class PostService {
+    private final PostRepository postRepository;
+    private final UserRepository userRepository;
+
+    public PostDto create(Long userId,
+                          PostDto postDto){
+        //Id 찾기
+        User user = userRepository.findById(userId).orElseThrow();
+        //만든 유처 post에 집어넣기
+        Post post = new Post();
+        post.setUser(user);
+        post.setTitle(postDto.getTitle());
+        post.setContent(postDto.getContent());
+        //레포지토리에 저장하기
+        postRepository.save(post);
+
+        return postDto;
+
+    }
+    //글 최신 순 글 조회
+
+    public List<PostDto> getRecentPosts(){
+        return postRepository.findAllByOrderByCreatedAtDesc()
+                .stream()
+                .map(PostDto::new)
+                .collect(Collectors.toList());
+
+
+    }
+
+    //작성자 글 조회
+    public List<PostDto> getPostsByWriter(String nickname){
+        // 닉네임으로 찾고
+        User user = userRepository.findByNickname(nickname);
+
+        return postRepository.findAllByUserId(user.getId()).stream()
+                .map(PostDto::new)
+                .collect(Collectors.toList());
+
+
+
+
+    }
+
+
+    //댓글 많은 순 글 조회
+    public List<PostDto> getPopularPosts(){
+        return postRepository.findAllByOrderByCommentCntDesc().stream()
+                .map(PostDto::new)
+                .collect(Collectors.toList());
+
+
+    }
+
+
 
 }
diff --git a/src/main/java/com/example/springhw32/service/UserService.java b/src/main/java/com/example/springhw32/service/UserService.java
index 8badccf..d261e53 100644
--- a/src/main/java/com/example/springhw32/service/UserService.java
+++ b/src/main/java/com/example/springhw32/service/UserService.java
@@ -1,5 +1,22 @@
 package com.example.springhw32.service;
 
+import com.example.springhw32.dto.UserDto;
+import com.example.springhw32.entity.User;
+import com.example.springhw32.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+@RequiredArgsConstructor
+@Service
 public class UserService {
+    private final UserRepository userRepository;
+
+    public UserDto join(UserDto userDto){
+        User user = new User();
+        user.setUsername(userDto.getUsername());
+        user.setNickname(userDto.getNickname());
+        user.setPassword(userDto.getPassword());
+        userRepository.save(user);
+        return userDto;
+    }
 
 }