follow service, controller 구현

src/main/java/backend/wedstagram/Converter/FollowConverter.java

@@ -0,0 +1,14 @@
+package backend.wedstagram.Converter;
+
+import backend.wedstagram.domain.Follow;
+import backend.wedstagram.domain.Member;
+
+public class FollowConverter {
+
+    public static Follow toFollow(Member follower, Member following){
+        return Follow.builder()
+                .follower(follower)
+                .following(following)
+                .build();
+    }
+}

src/main/java/backend/wedstagram/controller/FollowController.java

@@ -0,0 +1,80 @@
+package backend.wedstagram.controller;
+
+import backend.wedstagram.Converter.FollowConverter;
+import backend.wedstagram.domain.Follow;
+import backend.wedstagram.domain.Member;
+import backend.wedstagram.dto.FollowDto.FollowDto;
+import backend.wedstagram.dto.FollowDto.FollowResponseDto;
+import backend.wedstagram.service.FollowService.FollowService;
+import backend.wedstagram.service.MemberService.MemberService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+public class FollowController {
+
+    private final FollowService followService;
+    private final MemberService memberService;
+
+    // 팔로우하기
+    @PostMapping("{userName}/follow")
+    public ResponseEntity<String> followUser(@PathVariable(value = "userName") String userName, @RequestBody String recieveUserName) {
+
+        Member follower = memberService.getMemberByUsername(userName);
+        Member Following = memberService.getMemberByUsername(recieveUserName);
+
+        Follow follow = FollowConverter.toFollow(follower, Following);
+
+        followService.saveFollow(follow);
+        return ResponseEntity.status(HttpStatus.OK).body("팔로우 완료");
+    }
+
+    // 언팔로우하기
+    @DeleteMapping("{userName}/unfollow")
+    public ResponseEntity<String> unfollowUser(@PathVariable(value = "userName") String userName, @RequestBody String recieveUserName) {
+
+        followService.deleteFollow(userName, recieveUserName);
+        return ResponseEntity.status(HttpStatus.OK).body("언팔로우 완료");
+    }
+
+    // 내 팔로워 보기
+    @GetMapping("{userName}/followers")
+    public ResponseEntity<FollowResponseDto> getFollowers(@PathVariable(value = "userName") String userName) {
+
+        Member member = memberService.getMemberByUsername(userName);
+        List<FollowDto> followers = followService.getFollowers(member.getUserName());
+
+        FollowResponseDto followResponseDto = FollowResponseDto.builder()
+                .followList(followers)
+                .build();
+
+        return ResponseEntity.status(HttpStatus.OK).body(followResponseDto);
+    }
+
+    // 내 팔로잉 보기
+    @GetMapping("{userName}/followings")
+    public ResponseEntity<FollowResponseDto> getFollowings(@PathVariable(value = "userName") String userName) {
+
+        Member member = memberService.getMemberByUsername(userName);
+        List<FollowDto> followings = followService.getFollowings(member.getUserName());
+
+        FollowResponseDto followResponseDto = FollowResponseDto.builder()
+                .followList(followings)
+                .build();
+
+        return ResponseEntity.status(HttpStatus.OK).body(followResponseDto);
+    }
+
+    // 팔로워 삭제
+    @DeleteMapping("{userName}/followers")
+    public ResponseEntity<String> deleteFollowers(@PathVariable(value = "userName") String userName, @RequestBody String recieveUserName) {
+
+        followService.deleteFollow(recieveUserName, userName);
+        return ResponseEntity.status(HttpStatus.OK).body("팔로워 삭제 완료");
+    }
+}

src/main/java/backend/wedstagram/domain/Member.java

@@ -1,14 +1,13 @@
 package backend.wedstagram.domain;
 
-import jakarta.persistence.Entity;
-import jakarta.persistence.GeneratedValue;
-import jakarta.persistence.GenerationType;
-import jakarta.persistence.Id;
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 @Entity
 @Getter
 @Builder
@@ -28,4 +27,10 @@ public class Member {
     //S3 사용 예정
     private String imageUrl;
 
+    @OneToMany(mappedBy = "follower")
+    private List<Follow> followers;
+
+    @OneToMany(mappedBy = "following")
+    private List<Follow> followings;
+
 }

src/main/java/backend/wedstagram/dto/FollowDto/FollowDto.java

@@ -0,0 +1,19 @@
+package backend.wedstagram.dto.FollowDto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Builder
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class FollowDto {
+
+    private Long id;
+    private String userName;
+    private String name;
+    private String profileImage;
+
+}

src/main/java/backend/wedstagram/dto/FollowDto/FollowResponseDto.java

@@ -0,0 +1,16 @@
+package backend.wedstagram.dto.FollowDto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Builder
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class FollowResponseDto {
+    private List<FollowDto> followList;
+}

src/main/java/backend/wedstagram/repository/FollowRepository.java

@@ -3,5 +3,13 @@
 import backend.wedstagram.domain.Follow;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.List;
+import java.util.Optional;
+
 public interface FollowRepository extends JpaRepository<Follow,Long> {
+    Follow findByFollowerAndFollowing(String followerUserName, String followingUserName);
+
+    List<Follow> findAllByFollowingId(Long followingId);
+
+    Follow deleteFollowByFollowerAndFollowing(String followerUserName, String followingUserName);
 }

src/main/java/backend/wedstagram/repository/MemberRepository.java

@@ -7,4 +7,6 @@
 
 public interface MemberRepository extends JpaRepository<Member,Long> {
     Optional<Member> findById(Long memberId);
+
+    Optional<Member> findByUserName(String UserName);
 }

src/main/java/backend/wedstagram/service/FollowService/FollowService.java

@@ -0,0 +1,16 @@
+package backend.wedstagram.service.FollowService;
+
+import backend.wedstagram.domain.Follow;
+import backend.wedstagram.dto.FollowDto.FollowDto;
+
+import java.util.List;
+
+public interface FollowService {
+
+    public void saveFollow(Follow follow);
+    public void deleteFollow(String followerUserName, String followingUserName);
+
+    public List<FollowDto> getFollowers(String userName);
+    public List<FollowDto> getFollowings(String userName);
+
+}

src/main/java/backend/wedstagram/service/FollowService/FollowServiceImpl.java

@@ -0,0 +1,67 @@
+package backend.wedstagram.service.FollowService;
+
+import backend.wedstagram.domain.Follow;
+import backend.wedstagram.domain.Member;
+import backend.wedstagram.dto.FollowDto.FollowDto;
+import backend.wedstagram.repository.FollowRepository;
+import backend.wedstagram.repository.MemberRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Service
+@RequiredArgsConstructor
+public class FollowServiceImpl implements FollowService {
+
+    private final FollowRepository followRepository;
+    private final MemberRepository memberRepository;
+
+    @Override
+    public void saveFollow(Follow follow) {
+        followRepository.save(follow);
+    }
+
+    @Override
+    public void deleteFollow(String followerUserName, String followingUserName) {
+        followRepository.deleteFollowByFollowerAndFollowing(followerUserName, followingUserName);
+    }
+
+    @Override
+    public void findFollowByFollowerAndFollowing(String followerUserName, String followingUserName) {
+        followRepository.findByFollowerAndFollowing(followerUserName, followingUserName);
+    }
+
+    @Override
+    public List<FollowDto> getFollowers(String userName) {
+        Member member = memberRepository.findByUserName(userName).get();
+        List<Follow> followers = member.getFollowers();
+
+        List<FollowDto> collectFollowDtos = followers.stream().map(Follow::getFollower).map(follower -> FollowDto.builder()
+                .id(follower.getId())
+                .userName(follower.getUserName())
+                .name(follower.getName())
+                .profileImage(follower.getImageUrl())
+                .build()).collect(Collectors.toList());
+
+        return collectFollowDtos;
+    }
+
+    @Override
+    public List<FollowDto> getFollowings(String userName) {
+        Member member = memberRepository.findByUserName(userName).get();
+        List<Follow> followings = member.getFollowings();
+
+        List<FollowDto> collectFollowDtos = followings.stream().map(Follow::getFollowing).map(following -> FollowDto.builder()
+                .id(following.getId())
+                .userName(following.getUserName())
+                .name(following.getName())
+                .profileImage(following.getImageUrl())
+                .build()).collect(Collectors.toList());
+
+        return collectFollowDtos;
+    }
+}

src/main/java/backend/wedstagram/service/MemberService/MemberService.java

@@ -5,4 +5,6 @@
 public interface MemberService {
 
     Member getMemberById(Long memberId);
+
+    Member getMemberByUsername(String username);
 }

src/main/java/backend/wedstagram/service/MemberService/MemberServiceImpl.java

@@ -16,4 +16,9 @@ public Member getMemberById(Long memberId){
         return memberRepository.findById(memberId).orElseThrow();
     }
 
+    @Override
+    public Member getMemberByUsername(String username) {
+        return memberRepository.findByUserName(username).orElseThrow();
+    }
+
 }

src/main/java/backend/wedstagram/service/MyPageService/MyPageService.java

@@ -0,0 +1,4 @@
+package backend.wedstagram.service.MyPageService;
+
+public interface MyPageService {
+}

src/main/java/backend/wedstagram/service/MyPageService/MyPageServiceImpl.java

@@ -0,0 +1,4 @@
+package backend.wedstagram.service.MyPageService;
+
+public class MyPageServiceImpl {
+}