week7

build.gradle

@@ -26,6 +26,7 @@ configurations {
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
 	compileOnly 'org.projectlombok:lombok'
 	runtimeOnly 'com.mysql:mysql-connector-j'
 	annotationProcessor 'org.projectlombok:lombok'

src/main/java/umc/study/apiPayload/ApiResponse.java

@@ -0,0 +1,39 @@
+package umc.study.apiPayload;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import umc.study.apiPayload.code.BaseCode;
+import umc.study.apiPayload.code.status.SuccessStatus;
+
+@Getter
+@AllArgsConstructor
+@JsonPropertyOrder({"isSuccess", "code", "message", "result"})
+public class ApiResponse<T> {
+
+    @JsonProperty("isSuccess")
+    private final Boolean isSuccess;
+    private final String code;
+    private final String message;
+    @JsonInclude(JsonInclude.Include.NON_NULL)
+    private T result;
+
+
+    // 성공한 경우 응답 생성
+
+    public static <T> ApiResponse<T> onSuccess(T result){
+        return new ApiResponse<>(true, SuccessStatus._OK.getCode() , SuccessStatus._OK.getMessage(), result);
+    }
+
+    public static <T> ApiResponse<T> of(BaseCode code, T result){
+            return new ApiResponse<>(true, code.getReasonHttpStatus().getCode() , code.getReasonHttpStatus().getMessage(), result);
+    }
+
+
+    // 실패한 경우 응답 생성
+    public static <T> ApiResponse<T> onFailure(String code, String message, T data){
+        return new ApiResponse<>(false, code, message, data);
+    }
+}

src/main/java/umc/study/apiPayload/code/BaseCode.java

@@ -0,0 +1,8 @@
+package umc.study.apiPayload.code;
+
+public interface BaseCode {
+
+    ReasonDTO getReason();
+
+    ReasonDTO getReasonHttpStatus();
+}

src/main/java/umc/study/apiPayload/code/BaseErrorCode.java

@@ -0,0 +1,7 @@
+package umc.study.apiPayload.code;
+
+public interface BaseErrorCode {
+    ErrorReasonDTO getReason();
+
+    ErrorReasonDTO getReasonHttpStatus();
+}

src/main/java/umc/study/apiPayload/code/ErrorReasonDTO.java

@@ -0,0 +1,17 @@
+package umc.study.apiPayload.code;
+
+import lombok.Builder;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@Builder
+public class ErrorReasonDTO {
+    private HttpStatus httpStatus;
+
+    private final boolean isSuccess;
+    private final String code;
+    private final String message;
+
+    public boolean getIsSuccess(){return isSuccess;}
+}

src/main/java/umc/study/apiPayload/code/ReasonDTO.java

@@ -0,0 +1,17 @@
+package umc.study.apiPayload.code;
+
+import lombok.Builder;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@Builder
+public class ReasonDTO {
+    private HttpStatus httpStatus;
+
+    private final boolean isSuccess;
+    private final String code;
+    private final String message;
+
+    public boolean getIsSuccess(){return isSuccess;}
+}

src/main/java/umc/study/apiPayload/code/status/ErrorStatus.java

@@ -0,0 +1,49 @@
+package umc.study.apiPayload.code.status;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+import umc.study.apiPayload.code.BaseErrorCode;
+import umc.study.apiPayload.code.ErrorReasonDTO;
+
+@Getter
+@AllArgsConstructor
+public enum ErrorStatus implements BaseErrorCode {
+    // 가장 일반적인 응답
+    _INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "COMMON500", "서버 에러, 관리자에게 문의 바랍니다."),
+    _BAD_REQUEST(HttpStatus.BAD_REQUEST,"COMMON400","잘못된 요청입니다."),
+    _UNAUTHORIZED(HttpStatus.UNAUTHORIZED,"COMMON401","인증이 필요합니다."),
+    _FORBIDDEN(HttpStatus.FORBIDDEN, "COMMON403", "금지된 요청입니다."),
+
+
+    // 멤버 관려 에러
+    MEMBER_NOT_FOUND(HttpStatus.BAD_REQUEST, "MEMBER4001", "사용자가 없습니다."),
+    NICKNAME_NOT_EXIST(HttpStatus.BAD_REQUEST, "MEMBER4002", "닉네임은 필수 입니다."),
+
+    // 예시,,,
+    TEMP_EXCEPTION(HttpStatus.BAD_REQUEST, "TEMP4001","이거는 테스트"),
+    ARTICLE_NOT_FOUND(HttpStatus.NOT_FOUND, "ARTICLE4001", "게시글이 없습니다.");
+
+    private final HttpStatus httpStatus;
+    private final String code;
+    private final String message;
+
+    @Override
+    public ErrorReasonDTO getReason() {
+        return ErrorReasonDTO.builder()
+                .message(message)
+                .code(code)
+                .isSuccess(false)
+                .build();
+    }
+
+    @Override
+    public ErrorReasonDTO getReasonHttpStatus() {
+        return ErrorReasonDTO.builder()
+                .message(message)
+                .code(code)
+                .isSuccess(false)
+                .httpStatus(httpStatus)
+                .build();
+    }
+}

src/main/java/umc/study/apiPayload/code/status/SuccessStatus.java

@@ -0,0 +1,39 @@
+package umc.study.apiPayload.code.status;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+import umc.study.apiPayload.code.BaseCode;
+import umc.study.apiPayload.code.ReasonDTO;
+
+@Getter
+@AllArgsConstructor
+public enum SuccessStatus implements BaseCode {
+
+    // 일반적인 응답
+    _OK(HttpStatus.OK, "COMMON200", "성공입니다.");
+
+    private final HttpStatus httpStatus;
+    private final String code;
+    private final String message;
+
+    @Override
+    public ReasonDTO getReason() {
+        return ReasonDTO.builder()
+                .message(message)
+                .code(code)
+                .isSuccess(true)
+                .build();
+    }
+
+    @Override
+    public ReasonDTO getReasonHttpStatus() {
+        return ReasonDTO.builder()
+                .message(message)
+                .code(code)
+                .isSuccess(true)
+                .httpStatus(httpStatus)
+                .build()
+                ;
+    }
+}

src/main/java/umc/study/apiPayload/exception/ExceptionAdvice.java

@@ -0,0 +1,119 @@
+package umc.study.apiPayload.exception;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.validation.ConstraintViolationException;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.context.request.ServletWebRequest;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+import umc.study.apiPayload.ApiResponse;
+import umc.study.apiPayload.code.ErrorReasonDTO;
+import umc.study.apiPayload.code.status.ErrorStatus;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Optional;
+
+@Slf4j
+@RestControllerAdvice(annotations = {RestController.class})
+public class ExceptionAdvice extends ResponseEntityExceptionHandler {
+
+
+    @ExceptionHandler
+    public ResponseEntity<Object> validation(ConstraintViolationException e, WebRequest request) {
+        String errorMessage = e.getConstraintViolations().stream()
+                .map(constraintViolation -> constraintViolation.getMessage())
+                .findFirst()
+                .orElseThrow(() -> new RuntimeException("ConstraintViolationException 추출 도중 에러 발생"));
+
+        return handleExceptionInternalConstraint(e, ErrorStatus.valueOf(errorMessage), HttpHeaders.EMPTY,request);
+    }
+    @Override
+    public ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException e, HttpHeaders headers, HttpStatusCode status, WebRequest request) {
+
+        Map<String, String> errors = new LinkedHashMap<>();
+
+        e.getBindingResult().getFieldErrors().stream()
+                .forEach(fieldError -> {
+                    String fieldName = fieldError.getField();
+                    String errorMessage = Optional.ofNullable(fieldError.getDefaultMessage()).orElse("");
+                    errors.merge(fieldName, errorMessage, (existingErrorMessage, newErrorMessage) -> existingErrorMessage + ", " + newErrorMessage);
+                });
+
+        return handleExceptionInternalArgs(e,HttpHeaders.EMPTY,ErrorStatus.valueOf("_BAD_REQUEST"),request,errors);
+    }
+
+    @ExceptionHandler
+    public ResponseEntity<Object> exception(Exception e, WebRequest request) {
+        e.printStackTrace();
+
+        return handleExceptionInternalFalse(e, ErrorStatus._INTERNAL_SERVER_ERROR, HttpHeaders.EMPTY, ErrorStatus._INTERNAL_SERVER_ERROR.getHttpStatus(),request, e.getMessage());
+    }
+
+    @ExceptionHandler(value = GeneralException.class)
+    public ResponseEntity onThrowException(GeneralException generalException, HttpServletRequest request) {
+        // GeneralException에 대해 다시 한번 오버로딩 된 함수를 호출
+        ErrorReasonDTO errorReasonHttpStatus = generalException.getErrorReasonHttpStatus();
+        return handleExceptionInternal(generalException,errorReasonHttpStatus,null,request);
+    }
+
+    private ResponseEntity<Object> handleExceptionInternal(Exception e, ErrorReasonDTO reason,
+                                                           HttpHeaders headers, HttpServletRequest request) {
+        // 상속받은 부모 클래스의 생성자를 호출
+        ApiResponse<Object> body = ApiResponse.onFailure(reason.getCode(),reason.getMessage(),null);
+//        e.printStackTrace();
+
+        WebRequest webRequest = new ServletWebRequest(request);
+        return super.handleExceptionInternal(
+                e,
+                body,
+                headers,
+                reason.getHttpStatus(),
+                webRequest
+        );
+    }
+
+    private ResponseEntity<Object> handleExceptionInternalFalse(Exception e, ErrorStatus errorCommonStatus,
+                                                                HttpHeaders headers, HttpStatus status, WebRequest request, String errorPoint) {
+        ApiResponse<Object> body = ApiResponse.onFailure(errorCommonStatus.getCode(),errorCommonStatus.getMessage(),errorPoint);
+        return super.handleExceptionInternal(
+                e,
+                body,
+                headers,
+                status,
+                request
+        );
+    }
+
+    private ResponseEntity<Object> handleExceptionInternalArgs(Exception e, HttpHeaders headers, ErrorStatus errorCommonStatus,
+                                                               WebRequest request, Map<String, String> errorArgs) {
+        ApiResponse<Object> body = ApiResponse.onFailure(errorCommonStatus.getCode(),errorCommonStatus.getMessage(),errorArgs);
+        return super.handleExceptionInternal(
+                e,
+                body,
+                headers,
+                errorCommonStatus.getHttpStatus(),
+                request
+        );
+    }
+
+    private ResponseEntity<Object> handleExceptionInternalConstraint(Exception e, ErrorStatus errorCommonStatus,
+                                                                     HttpHeaders headers, WebRequest request) {
+        ApiResponse<Object> body = ApiResponse.onFailure(errorCommonStatus.getCode(), errorCommonStatus.getMessage(), null);
+        return super.handleExceptionInternal(
+                e,
+                body,
+                headers,
+                errorCommonStatus.getHttpStatus(),
+                request
+        );
+    }
+}

src/main/java/umc/study/apiPayload/exception/GeneralException.java

@@ -0,0 +1,20 @@
+package umc.study.apiPayload.exception;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import umc.study.apiPayload.code.BaseErrorCode;
+import umc.study.apiPayload.code.ErrorReasonDTO;
+
+@Getter
+@AllArgsConstructor
+public class GeneralException extends RuntimeException {
+    private BaseErrorCode code;
+
+    public ErrorReasonDTO getErrorReason() {
+        return this.code.getReason();
+    }
+
+    public ErrorReasonDTO getErrorReasonHttpStatus(){
+        return this.code.getReasonHttpStatus();
+    }
+}

src/main/java/umc/study/apiPayload/exception/handler/TempHandler.java

@@ -0,0 +1,10 @@
+package umc.study.apiPayload.exception.handler;
+
+import umc.study.apiPayload.code.BaseErrorCode;
+import umc.study.apiPayload.exception.GeneralException;
+
+public class TempHandler extends GeneralException {
+    public TempHandler(BaseErrorCode errorCode){
+        super(errorCode); // 상위클래스의 생성자를 호출하여, GeneralException의 로직대로 errorCode를 초기화
+    }
+}

src/main/java/umc/study/converter/TempConverter.java

@@ -0,0 +1,16 @@
+package umc.study.converter;
+
+import umc.study.web.dto.TempResponse;
+
+public class TempConverter {
+    public static TempResponse.TempTestDTO toTempTestDTO() {
+        return TempResponse.TempTestDTO.builder()
+                .testString("This is Test!")
+                .build();
+    }
+    public static TempResponse.TempExceptionDTO toTempExceptionDTO(Integer flag) {
+        return TempResponse.TempExceptionDTO.builder()
+                .flag(flag)
+                .build();
+    }
+}

src/main/java/umc/study/service/TempService/TempCommandService.java

@@ -0,0 +1,6 @@
+package umc.study.service.TempService;
+
+public interface TempCommandService {
+    // GET요청이 아닌 요청에 대햇너느 비즈니스 로직을 CommandService로 네이밍한다.
+    // 서비스를 만들 경우 인터페이스를 먼저 두고 이를 구체화한다
+}

src/main/java/umc/study/service/TempService/TempCommandServiceImpl.java

@@ -0,0 +1,10 @@
+package umc.study.service.TempService;
+
+import lombok.NoArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@NoArgsConstructor
+public class TempCommandServiceImpl implements TempCommandService {
+    // 컨트롤러는 인터페이스를 의존하며 실제 인터페이스에 대한 구체화 클래스는 스프링부트의 의존성 주입을 이용한다
+}

src/main/java/umc/study/service/TempService/TempQueryService.java

@@ -0,0 +1,5 @@
+package umc.study.service.TempService;
+
+public interface TempQueryService {
+    void CheckFlag(Integer flag);
+}