Feat/week 3

README.md

@@ -1 +1,3 @@
 # backend-study-sns
+
+강준이

build.gradle

@@ -10,7 +10,7 @@ description = 'Demo project for Spring Boot'
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(21)
+		languageVersion = JavaLanguageVersion.of(17)
 	}
 }
 
@@ -19,8 +19,16 @@ repositories {
 }
 
 dependencies {
+    // Lombok
+    compileOnly 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+
 	implementation 'org.springframework.boot:spring-boot-starter-web'
-	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'org.springframework.boot:spring-boot-starter-jdbc'
+    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+    implementation 'com.mysql:mysql-connector-j:8.2.0' // MySQL
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 

src/main/java/com/example/devSns/DevSnsApplication.java

@@ -10,4 +10,4 @@ public static void main(String[] args) {
 		SpringApplication.run(DevSnsApplication.class, args);
 	}
 
-}
+}

src/main/java/com/example/devSns/config/DataInit.java

@@ -0,0 +1,24 @@
+package com.example.devSns.config;
+
+import com.example.devSns.entity.MemberEntity;
+import com.example.devSns.repository.MemberRepository;
+import jakarta.annotation.PostConstruct;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DataInit {
+
+    private final MemberRepository memberRepository;
+
+    public DataInit(MemberRepository memberRepository) {
+        this.memberRepository = memberRepository;
+    }
+
+    @PostConstruct
+    public void init() {
+        // Member가 없으면 테스트용 계정 자동 생성
+        if (memberRepository.count() == 0) {
+            memberRepository.save(MemberEntity.create("tester", "tester@example.com"));
+        }
+    }
+}

src/main/java/com/example/devSns/controller/CommentController.java

@@ -0,0 +1,31 @@
+package com.example.devSns.controller;
+
+import com.example.devSns.dto.CommentRequest;
+import com.example.devSns.entity.CommentEntity;
+import com.example.devSns.service.CommentService;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+@RequestMapping("/comments")
+public class CommentController {
+    private final CommentService commentService;
+
+    public CommentController(CommentService commentService) {
+        this.commentService = commentService;
+    }
+
+    // 댓글 생성
+    @PostMapping("/{postId}")
+    public String createComment(@PathVariable Long postId, @ModelAttribute CommentRequest request) {
+        commentService.createComment(postId, request);
+        return "redirect:/posts/" + postId;
+    }
+
+    // 댓글 삭제
+    @PostMapping("/{commentId}/delete")
+    public String deleteComment(@PathVariable Long commentId, @RequestParam Long postId) {
+        commentService.deleteComment(commentId);
+        return "redirect:/posts/" + postId;
+    }
+}

src/main/java/com/example/devSns/controller/MemberController.java

@@ -0,0 +1,61 @@
+package com.example.devSns.controller;
+
+import com.example.devSns.entity.MemberEntity;
+import com.example.devSns.service.MemberService;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+@RequestMapping("/members")
+public class MemberController {
+
+    private final MemberService memberService;
+
+    public MemberController(MemberService memberService) {
+        this.memberService = memberService;
+    }
+
+     // 전체 멤버 목록
+    @GetMapping
+    public String list(Model model) {
+        model.addAttribute("members", memberService.getAllMembers());
+        return "member-list";
+    }
+
+    // 멤버 상세 페이지
+    @GetMapping("/{id}")
+    public String detail(@PathVariable Long id, Model model) {
+        MemberEntity member = memberService.getMember(id);
+
+        model.addAttribute("member", member);
+        model.addAttribute("posts", member.getPosts());
+        model.addAttribute("comments", member.getComments());
+
+        return "member-detail";
+    }
+
+     // 멤버 생성
+    @GetMapping("/new")
+    public String newForm() {
+        return "member-form";
+    }
+
+    // 멤버 생성 처리
+    @PostMapping
+    public String create(@RequestParam String username,
+                         @RequestParam String email) {
+
+        memberService.createMember(username, email);
+        return "redirect:/members";
+    }
+
+     // 멤버 검색
+     // /members/search?keyword=abc
+    @GetMapping("/search")
+    public String search(@RequestParam String keyword, Model model) {
+        model.addAttribute("members", memberService.search(keyword));
+        model.addAttribute("keyword", keyword);
+        return "member-search";
+    }
+}

src/main/java/com/example/devSns/controller/PostController.java

@@ -0,0 +1,95 @@
+package com.example.devSns.controller;
+
+import com.example.devSns.entity.MemberEntity;
+import com.example.devSns.entity.PostEntity;
+import com.example.devSns.repository.LikeRepository;
+import com.example.devSns.repository.MemberRepository;
+import com.example.devSns.service.PostService;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+@RequestMapping("/posts")
+public class PostController {
+
+    private final PostService postService;
+    private final LikeRepository likeRepository;
+    private final MemberRepository memberRepository;
+
+    // 생성자
+    public PostController(PostService postService,
+                          LikeRepository likeRepository,
+                          MemberRepository memberRepository) {
+        this.postService = postService;
+        this.likeRepository = likeRepository;
+        this.memberRepository = memberRepository;
+    }
+
+    // HTTP GET /posts
+    @GetMapping
+    public String list(Model model) {
+        model.addAttribute("posts", postService.getAllPosts());
+        return "list";
+    }
+
+    // HTTP GET /posts/new
+    @GetMapping("/new")
+    public String form(Model model) {
+        model.addAttribute("post", new PostEntity());
+        return "form";
+    }
+
+    // HTTP POST /posts
+    @PostMapping
+    public String create(@ModelAttribute PostEntity postEntity) {
+        postService.createPost(postEntity);
+        return "redirect:/posts"; // 글 생성 후 돌아올 주소
+    }
+
+    // HTTP GET /posts/{id}
+    @GetMapping("/{id}")
+    public String detail(@PathVariable Long id, Model model) {
+        PostEntity postEntity = postService.getPost(id);
+
+        // 임시 멤버 아이디
+        Long memberId = 1L;
+        MemberEntity member = memberRepository.findById(memberId).orElseThrow();
+
+        // 좋아요 수
+        int likeCount = likeRepository.countByPostId(id);
+
+        // 좋아요 여부
+        boolean liked = likeRepository
+                .findByMemberAndPost(member, postEntity)
+                .isPresent();
+
+        model.addAttribute("post", postEntity);
+        model.addAttribute("likeCount", likeCount);
+        model.addAttribute("liked", liked);
+        model.addAttribute("memberId", memberId);
+        return "detail";
+    }
+
+    // HTTP GET /posts/{id}/edit
+    @GetMapping("/{id}/edit")
+    public String editForm(@PathVariable Long id, Model model) {
+        PostEntity postEntity = postService.getPost(id);
+        model.addAttribute("post", postEntity);
+        return "edit";
+    }
+
+    // HTTP POST /posts/{id}/update
+    @PostMapping("/{id}/update")
+    public String update(@PathVariable Long id, @ModelAttribute PostEntity updatedPost) {
+        postService.updatePost(id, updatedPost);
+        return "redirect:/posts/" + id; // 수정 후 돌아올 주소
+    }
+
+    // HTTP POST /posts/{id}/delete
+    @PostMapping("/{id}/delete")
+    public String delete(@PathVariable Long id) {
+        postService.deletePost(id);
+        return "redirect:/posts"; // 삭제 후 돌아올 주소
+    }
+}

src/main/java/com/example/devSns/controller/explanation

@@ -0,0 +1,24 @@
+요청을 받는 곳
+
+PostController
+Spring MVC 패턴에서 Controller 계층 역할
+- 사용자의 요청을 받고 Service 계층을 호출해서 처리한 후, 결과를 View에 전달
+
+@Controller
+이 클래스는 웹 요청을 처리하는 컨트롤러임을 알려줌
+- Model에 데이터를 담아 템플릿에 전달 (templates/list.html)
+
+@RequestMapping
+클래스 전체의 기본 URL 경로를 지정
+- 이 컨트롤러 안의 모든 요청은 /posts로 시작
+- /posts (게시글 목록), /posts/new (새 글 작성 폼)
+
+@GetMapping, @PostMapping
+HTTP 메서드 별 라우팅
+
+@PathVariable, @ModelAttribute
+URL 경로 변수 바인딩 / 폼 데이터를 객체에 바인딩
+
+@RestController
+문자열 반환이 뷰 이름이 아닌 JSON
+- REST API 만들 때 사용

src/main/java/com/example/devSns/dto/CommentRequest.java

@@ -0,0 +1,13 @@
+package com.example.devSns.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class CommentRequest {
+    private String username;
+    private String content;
+}
+
+// Controller는 CommentEntity를 직접 받지 않고 CommentRequest만 받게 됨

src/main/java/com/example/devSns/dto/CommentResponse.java

@@ -0,0 +1,20 @@
+package com.example.devSns.dto;
+
+import lombok.Getter;
+
+@Getter
+public class CommentResponse {
+    private final Long id;
+    private final String username;
+    private final String content;
+    private final String createdAt;
+
+    public CommentResponse(Long id, String username, String content, String createdAt) {
+        this.id = id;
+        this.username = username;
+        this.content = content;
+        this.createdAt = createdAt;
+    }
+}
+
+// Entity를 외부로 그대로 내보내지 않고 DTO로 가공해서 반환

src/main/java/com/example/devSns/dto/explanation

@@ -0,0 +1,8 @@
+계층간 데이터 교환에 사용
+- Entity 클래스를 보호
+- 필요한 데이터만 선택적으로 담을 수 있음
+
+분리해서 사용하는 이유
+- Entity 객체의 변경을 피하기 위함
+- 클라이언트와 통신하는 ResponseDTO나 RequestDTO는 요구사항에 따라 자주 변경
+- 어떤 요청에서는 특정 값이 추가되거나 없을 수 있어서 분리해서 관리

src/main/java/com/example/devSns/entity/CommentEntity.java

@@ -0,0 +1,57 @@
+package com.example.devSns.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+// DTO를 사용하고 Setter를 삭제 (안전)
+@Entity
+@Getter
+public class CommentEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String content;
+    private String username;
+
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "member_id")
+    private MemberEntity member;
+
+    // Post와 N:1 관계
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "post_id")
+    private PostEntity postEntity;
+
+    // JPA 기본 생성자
+    protected CommentEntity() {}
+
+    // 정적 생성 메서드 > 엔터티 변경은 오직 메서드로
+    public static CommentEntity create(PostEntity postEntity, String username, String content) {
+        CommentEntity comment = new CommentEntity();
+        comment.postEntity = postEntity;
+        comment.username = username;
+        comment.content = content;
+        return comment;
+    }
+
+    public void updateContent(String content) {
+        this.content = content;
+    }
+
+    @PrePersist
+    public void onCreate() {
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    public void onUpdate() {
+        this.updatedAt = LocalDateTime.now();
+    }
+}