[Spring Core] 박지빈 과제 제출합니다.

build.gradle

@@ -21,6 +21,7 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-jdbc'
 	runtimeOnly 'com.mysql:mysql-connector-j'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
 }
 
 tasks.named('test') {

src/main/java/com/example/demo/controller/ArticleController.java

@@ -3,6 +3,11 @@
 import java.net.URI;
 import java.util.List;
 
+import com.example.demo.controller.Error.ErrorCode;
+import com.example.demo.controller.Error.ErrorResponse;
+import jakarta.validation.Valid;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -29,40 +34,41 @@ public ArticleController(ArticleService articleService) {
 
     @GetMapping("/articles")
     public ResponseEntity<List<ArticleResponse>> getArticles(
-        @RequestParam Long boardId
+            @RequestParam Long boardId
     ) {
         List<ArticleResponse> response = articleService.getByBoardId(boardId);
         return ResponseEntity.ok(response);
     }
 
     @GetMapping("/articles/{id}")
     public ResponseEntity<ArticleResponse> getArticle(
-        @PathVariable Long id
+            @PathVariable Long id
     ) {
         ArticleResponse response = articleService.getById(id);
         return ResponseEntity.ok(response);
     }
 
     @PostMapping("/articles")
-    public ResponseEntity<ArticleResponse> crateArticle(
-        @RequestBody ArticleCreateRequest request
+    public ResponseEntity<?> createArticle(
+            @Valid
+            @RequestBody ArticleCreateRequest request
     ) {
         ArticleResponse response = articleService.create(request);
         return ResponseEntity.created(URI.create("/articles/" + response.id())).body(response);
     }
 
     @PutMapping("/articles/{id}")
-    public ResponseEntity<ArticleResponse> updateArticle(
-        @PathVariable Long id,
-        @RequestBody ArticleUpdateRequest request
+    public ResponseEntity<?> updateArticle(
+            @PathVariable Long id,
+            @RequestBody ArticleUpdateRequest request
     ) {
         ArticleResponse response = articleService.update(id, request);
         return ResponseEntity.ok(response);
     }
 
     @DeleteMapping("/articles/{id}")
     public ResponseEntity<Void> updateArticle(
-        @PathVariable Long id
+            @PathVariable Long id
     ) {
         articleService.delete(id);
         return ResponseEntity.noContent().build();

src/main/java/com/example/demo/controller/BoardController.java

@@ -2,6 +2,11 @@
 
 import java.util.List;
 
+import com.example.demo.controller.Error.ErrorCode;
+import com.example.demo.controller.Error.ErrorResponse;
+import jakarta.validation.Valid;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -32,29 +37,30 @@ public List<BoardResponse> getBoards() {
 
     @GetMapping("/boards/{id}")
     public BoardResponse getBoard(
-        @PathVariable Long id
+            @PathVariable Long id
     ) {
         return boardService.getBoardById(id);
     }
 
     @PostMapping("/boards")
     public BoardResponse createBoard(
-        @RequestBody BoardCreateRequest request
+            @Valid
+            @RequestBody BoardCreateRequest request
     ) {
         return boardService.createBoard(request);
     }
 
     @PutMapping("/boards/{id}")
     public BoardResponse updateBoard(
-        @PathVariable Long id,
-        @RequestBody BoardUpdateRequest updateRequest
+            @PathVariable Long id,
+            @RequestBody BoardUpdateRequest updateRequest
     ) {
         return boardService.update(id, updateRequest);
     }
 
     @DeleteMapping("/boards/{id}")
-    public ResponseEntity<Void> deleteBoard(
-        @PathVariable Long id
+    public ResponseEntity<?> deleteBoard(
+            @PathVariable Long id
     ) {
         boardService.deleteBoard(id);
         return ResponseEntity.noContent().build();

src/main/java/com/example/demo/controller/Error/ErrorCode.java

@@ -0,0 +1,36 @@
+package com.example.demo.controller.Error;
+
+import org.springframework.http.HttpStatus;
+
+public enum ErrorCode {
+
+    NOT_EXIST_ELEMENT(HttpStatus.NOT_FOUND, "존재하지 않는 요소입니다."),
+    EMAIL_DUPLICATION(HttpStatus.CONFLICT, "이미 존재하는 이메일입니다."),
+
+    NULL_ELEMENT(HttpStatus.BAD_REQUEST, "null인 값이 존재합니다. 다시 입력해주세요."),
+
+    NOT_EXIST_USER(HttpStatus.BAD_REQUEST, "존재하지 않는 사용자 또는 게시판을 참조하고 있습니다."),
+
+    ARTICLE_EXIST(HttpStatus.BAD_REQUEST, "작성한 게시물이 존재합니다."),
+    BOARD_EXIST(HttpStatus.BAD_REQUEST, "해당 게시판에 작성된 게시물이 존재합니다.");
+
+
+    ErrorCode(HttpStatus status, String message) {
+        this.message = message;
+        this.status = status;
+
+    }
+
+    public HttpStatus getStatus() {
+        return status;
+    }
+
+
+    public String getMessage() {
+        return message;
+    }
+
+    private final HttpStatus status;
+
+    private final String message;
+}

src/main/java/com/example/demo/controller/Error/ErrorExceptionHandler.java

@@ -0,0 +1,58 @@
+package com.example.demo.controller.Error;
+
+
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.dao.EmptyResultDataAccessException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.BindingResult;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.sql.SQLIntegrityConstraintViolationException;
+
+@RestControllerAdvice
+public class ErrorExceptionHandler {
+
+
+    @ExceptionHandler(EmptyResultDataAccessException.class)
+    public ResponseEntity<ErrorResponse> EmptyResultDataAccessException(EmptyResultDataAccessException e) {
+        final ErrorResponse response = ErrorResponse.from(ErrorCode.NOT_EXIST_ELEMENT);
+        return new ResponseEntity<>(response, HttpStatus.valueOf(response.getStatus()));
+    }
+
+
+    @ExceptionHandler(NullPointerException.class)
+    public ResponseEntity<ErrorResponse> NullPointerException(NullPointerException e) {
+        final ErrorResponse response = ErrorResponse.from(ErrorCode.NULL_ELEMENT);
+        return new ResponseEntity<>(response, HttpStatus.valueOf(response.getStatus()));
+    }
+
+    @ExceptionHandler(DataIntegrityViolationException.class)
+    public ResponseEntity<ErrorResponse> DataIntegrityViolationException(DataIntegrityViolationException e) {
+        final ErrorResponse response = ErrorResponse.from(ErrorCode.NOT_EXIST_USER);
+        return new ResponseEntity<>(response, HttpStatus.valueOf(response.getStatus()));
+    }
+
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public String methodArgumentNotValidException(MethodArgumentNotValidException e) {
+        BindingResult bindingResult = e.getBindingResult();
+
+        StringBuilder stringBuilder = new StringBuilder();
+        for (FieldError fieldError : bindingResult.getFieldErrors()) {
+            stringBuilder.append("[");
+            stringBuilder.append(fieldError.getField());
+            stringBuilder.append("](은)는 ");
+            stringBuilder.append(fieldError.getDefaultMessage());
+            stringBuilder.append(" 입력된 값: [");
+            stringBuilder.append(fieldError.getRejectedValue());
+            stringBuilder.append("]\n");
+        }
+
+        return stringBuilder.toString();
+
+    }
+}

src/main/java/com/example/demo/controller/Error/ErrorResponse.java

@@ -0,0 +1,34 @@
+package com.example.demo.controller.Error;
+
+import org.springframework.validation.FieldError;
+
+import java.util.List;
+
+public class ErrorResponse {
+    private String message;
+    private int status;
+
+    public ErrorResponse(final ErrorCode errorCode) {
+        this.status = errorCode.getStatus().value();
+        this.message = errorCode.getMessage();
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public int getStatus() {
+        return status;
+    }
+
+
+    public ErrorResponse(final ErrorCode errorCode, final List<FieldError> errors) {
+        this.status = errorCode.getStatus().value();
+        this.message = errorCode.getMessage();
+    }
+
+    public static ErrorResponse from(final ErrorCode errorCode) {
+        return new ErrorResponse(errorCode);
+    }
+
+}

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

@@ -2,6 +2,12 @@
 
 import java.util.List;
 
+import com.example.demo.controller.Error.ErrorCode;
+import com.example.demo.controller.Error.ErrorResponse;
+import jakarta.validation.Valid;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.dao.DuplicateKeyException;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -33,34 +39,45 @@ public ResponseEntity<List<MemberResponse>> getMembers() {
 
     @GetMapping("/members/{id}")
     public ResponseEntity<MemberResponse> getMember(
-        @PathVariable Long id
+            @PathVariable Long id
     ) {
         MemberResponse response = memberService.getById(id);
         return ResponseEntity.ok(response);
     }
 
     @PostMapping("/members")
     public ResponseEntity<MemberResponse> create(
-        @RequestBody MemberCreateRequest request
+            @Valid
+            @RequestBody MemberCreateRequest request
     ) {
         MemberResponse response = memberService.create(request);
         return ResponseEntity.ok(response);
     }
 
     @PutMapping("/members/{id}")
-    public ResponseEntity<MemberResponse> updateMember(
-        @PathVariable Long id,
-        @RequestBody MemberUpdateRequest request
+    public ResponseEntity<?> updateMember(
+            @PathVariable Long id,
+            @RequestBody MemberUpdateRequest request
     ) {
-        MemberResponse response = memberService.update(id, request);
-        return ResponseEntity.ok(response);
+        try {
+            MemberResponse response = memberService.update(id, request);
+            return ResponseEntity.ok(response);
+        } catch (DuplicateKeyException e) {
+            final ErrorResponse response = ErrorResponse.from(ErrorCode.EMAIL_DUPLICATION);
+            return new ResponseEntity<>(response, HttpStatus.valueOf(response.getStatus()));
+        }
     }
 
     @DeleteMapping("/members/{id}")
-    public ResponseEntity<Void> deleteMember(
-        @PathVariable Long id
+    public ResponseEntity<?> deleteMember(
+            @PathVariable Long id
     ) {
-        memberService.delete(id);
-        return ResponseEntity.noContent().build();
+        try {
+            memberService.delete(id);
+            return ResponseEntity.noContent().build();
+        } catch (DataIntegrityViolationException e) {
+            final ErrorResponse response = ErrorResponse.from(ErrorCode.ARTICLE_EXIST);
+            return new ResponseEntity<>(response, HttpStatus.valueOf(response.getStatus()));
+        }
     }
 }

src/main/java/com/example/demo/controller/dto/request/ArticleCreateRequest.java

@@ -1,10 +1,16 @@
 package com.example.demo.controller.dto.request;
 
+import jakarta.validation.constraints.NotNull;
+
 public record ArticleCreateRequest(
-    Long authorId,
-    Long boardId,
-    String title,
-    String description
+        @NotNull
+        Long author_id,
+        @NotNull
+        Long board_id,
+        @NotNull
+        String title,
+        @NotNull
+        String content
 ) {
 
 }

src/main/java/com/example/demo/controller/dto/request/ArticleUpdateRequest.java

@@ -1,9 +1,14 @@
 package com.example.demo.controller.dto.request;
 
+import jakarta.validation.constraints.NotNull;
+
 public record ArticleUpdateRequest(
-    Long boardId,
-    String title,
-    String description
+        @NotNull
+        Long boardId,
+        @NotNull
+        String title,
+        @NotNull
+        String description
 ) {
 
 }

src/main/java/com/example/demo/controller/dto/request/BoardCreateRequest.java

@@ -1,7 +1,10 @@
 package com.example.demo.controller.dto.request;
 
+import jakarta.validation.constraints.NotNull;
+
 public record BoardCreateRequest(
-    String name
+        @NotNull
+        String name
 ) {
 
 }

src/main/java/com/example/demo/controller/dto/request/BoardUpdateRequest.java

@@ -1,7 +1,7 @@
 package com.example.demo.controller.dto.request;
 
 public record BoardUpdateRequest(
-    String name
+        String name
 ) {
 
 }

src/main/java/com/example/demo/controller/dto/request/MemberCreateRequest.java

@@ -1,9 +1,14 @@
 package com.example.demo.controller.dto.request;
 
+import jakarta.validation.constraints.NotNull;
+
 public record MemberCreateRequest(
-    String name,
-    String email,
-    String password
+        @NotNull
+        String name,
+        @NotNull
+        String email,
+        @NotNull
+        String password
 ) {
 
 }