feat: 수강신청 프로젝트 생성

src/main/java/com/study/course_registration/CourseRegistrationApplication.java

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+package com.study.course_registration;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CourseRegistrationApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(CourseRegistrationApplication.class, args);
+	}
+
+}

src/main/java/com/study/course_registration/config/JpaConfig.java

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+package com.study.course_registration.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+@Configuration 
+@EnableJpaAuditing
+public class JpaConfig {
+    
+}

src/main/java/com/study/course_registration/controller/CourseRegistrationController.java

@@ -0,0 +1,38 @@
+package com.study.course_registration.controller;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.study.course_registration.service.CourseRegistrationService;
+
+import com.study.course_registration.dto.RequestDto;
+import com.study.course_registration.dto.ResponseDto;
+
+@RestController
+@RequestMapping ("/api/v1")
+public class CourseRegistrationController {
+
+    private final CourseRegistrationService courseRegistrationService;
+    
+    public CourseRegistrationController(CourseRegistrationService courseRegistrationService) {
+        this.courseRegistrationService = courseRegistrationService;
+    }
+
+    @PostMapping("/course-register")
+    @Operation(summary = "Register a course",
+            description = "Registers a new course with the provided details.")
+    @ApiResponses({
+        @ApiResponse (responseCode = "200", description = "Course registered successfully"),
+        @ApiResponse (responseCode = "400", description = "Invalid request data")
+    })
+    public ResponseDto registerCourse(@Validated RequestDto requestDto) {
+        return courseRegistrationService.registerCourse(requestDto);
+    }
+
+}

src/main/java/com/study/course_registration/dto/RequestDto.java

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+package com.study.course_registration.dto;
+
+public record RequestDto(
+    
+) {
+    
+}

src/main/java/com/study/course_registration/dto/ResponseDto.java

@@ -0,0 +1,7 @@
+package com.study.course_registration.dto;
+
+public record ResponseDto(
+    
+) {
+    
+}

src/main/java/com/study/course_registration/entity/BaseCreateEntity.java

@@ -0,0 +1,15 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import jakarta.persistence.*;
+
+@MappedSuperclass 
+@EntityListeners (AuditingEntityListener.class)
+public class BaseCreateEntity {
+    @CreatedDate 
+    private Instant createdAt;
+}

src/main/java/com/study/course_registration/entity/BaseDeleteEntity.java

@@ -0,0 +1,24 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@MappedSuperclass
+@Getter 
+public class BaseDeleteEntity {
+    private Instant deletedAt;
+
+    public void delete() {
+        this.deletedAt = Instant.now();
+    }
+
+    public void restore() {
+        this.deletedAt = null;
+    }
+
+    public boolean isDeleted() {
+        return this.deletedAt != null;
+    }
+}

src/main/java/com/study/course_registration/entity/BaseEntity.java

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+package com.study.course_registration.entity;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@Getter
+@MappedSuperclass 
+public class BaseEntity {
+    @Id 
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private String id;
+}

src/main/java/com/study/course_registration/entity/BaseTimeZoneEntity.java

@@ -0,0 +1,19 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass 
+@EntityListeners (AuditingEntityListener.class)
+public class BaseTimeZoneEntity extends BaseEntity {
+    @CreatedDate 
+    private Instant createdAt;
+
+    @LastModifiedDate 
+    private Instant updatedAt;
+}

src/main/java/com/study/course_registration/entity/Lesson.java

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+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.Instant;
+
+@Entity 
+@NoArgsConstructor 
+@Getter 
+@Table(name = "lessons")
+public class Lesson extends BaseTimeZoneEntity {
+    private String name;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    private Subject subject;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    private Professor professor;
+
+    private Instant startTime;
+
+    private Instant endTime;
+
+    public Lesson(String name, Subject subject, Professor professor, Instant startTime, Instant endTime) {
+        this.name = name;
+        this.subject = subject;
+        this.professor = professor;
+        this.startTime = startTime;
+        this.endTime = endTime;
+    }
+}

src/main/java/com/study/course_registration/entity/Professor.java

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+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor 
+@Getter
+@Table(name = "professors")
+public class Professor extends BaseTimeZoneEntity {
+    private String name;
+
+    public Professor(String name) {
+        this.name = name;
+    }
+}

src/main/java/com/study/course_registration/entity/Subject.java

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+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor 
+@Getter 
+@Table(name = "subjects")
+public class Subject extends BaseTimeZoneEntity {
+    private String name;
+
+    private String code;
+
+    private String description;
+
+    public Subject(String name, String code, String description) {
+        this.name = name;
+        this.code = code;
+        this.description = description;
+    }
+}

src/main/java/com/study/course_registration/entity/User.java

@@ -0,0 +1,26 @@
+package com.study.course_registration.entity;
+
+import com.study.course_registration.enums.UserRole;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter 
+@NoArgsConstructor
+@Table(name = "users")
+public class User extends BaseTimeZoneEntity {
+    private String name;
+
+    private Long grade;
+
+    @Enumerated(EnumType.STRING)
+    private UserRole role;
+
+    public User(String name, Long grade, UserRole role) {
+        this.name = name;
+        this.grade = grade;
+        this.role = role;
+    }
+}

src/main/java/com/study/course_registration/entity/UserLesson.java

@@ -0,0 +1,36 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor
+@Getter
+@Table(name = "user_lessons")
+public class UserLesson extends BaseCreateEntity {
+
+    @EmbeddedId 
+    private UserLessonId id;
+
+    @MapsId("userId")
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn (
+        name = "user_id",
+        foreignKey = @ForeignKey(name = "fk_user_lesson_user_id")
+    )
+    private User user;
+
+    @MapsId("lessonId")
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn (
+        name = "lesson_id",
+        foreignKey = @ForeignKey(name = "fk_user_lesson_lesson_id")
+    )
+    private Lesson lesson;
+
+    public UserLesson(User user, Lesson lesson) {
+        this.user = user;
+        this.lesson = lesson;
+    }
+}

src/main/java/com/study/course_registration/entity/UserLessonId.java

@@ -0,0 +1,21 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.Embeddable;
+import java.io.Serializable;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Embeddable
+@Getter 
+@NoArgsConstructor 
+@EqualsAndHashCode 
+public class UserLessonId implements Serializable {
+    private String userId;
+    private String lessonId;
+    
+    public UserLessonId(String userId, String lessonId) {
+        this.userId = userId;
+        this.lessonId = lessonId;
+    }
+}

src/main/java/com/study/course_registration/enums/UserRole.java

@@ -0,0 +1,5 @@
+package com.study.course_registration.enums;
+
+public enum UserRole {
+    STUDENT, POSTGRADUATE
+}

src/main/java/com/study/course_registration/repository/LessonRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Lesson;
+
+public interface LessonRepository extends JpaRepository<Lesson, String> {
+    
+}

src/main/java/com/study/course_registration/repository/ProfessorRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Professor;
+
+public interface ProfessorRepository extends JpaRepository<Professor, String> {
+    
+}

src/main/java/com/study/course_registration/repository/SubjectRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Subject;
+
+public interface SubjectRepository extends JpaRepository<Subject, String> {
+    
+}

src/main/java/com/study/course_registration/repository/UserLessonRepository.java

@@ -0,0 +1,10 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.UserLesson;
+import com.study.course_registration.entity.UserLessonId;
+
+public interface UserLessonRepository extends JpaRepository<UserLesson, UserLessonId> {
+    
+}

src/main/java/com/study/course_registration/repository/UserRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.User;
+
+public interface UserRepository extends JpaRepository<User, String> {
+    
+}

src/main/java/com/study/course_registration/seeder/DataSeeder.java

@@ -0,0 +1,91 @@
+package com.study.course_registration.seeder;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.study.course_registration.entity.Lesson;
+import com.study.course_registration.entity.Professor;
+import com.study.course_registration.entity.Subject;
+import com.study.course_registration.entity.User;
+import com.study.course_registration.entity.UserLesson;
+import com.study.course_registration.enums.UserRole;
+import com.study.course_registration.repository.LessonRepository;
+import com.study.course_registration.repository.UserRepository;
+import com.study.course_registration.repository.SubjectRepository;
+import com.study.course_registration.repository.ProfessorRepository;
+import com.study.course_registration.repository.UserLessonRepository;
+
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+
+import org.springframework.boot.CommandLineRunner;
+
+@Component
+@Profile ("local")
+public class DataSeeder implements CommandLineRunner {
+
+    private static final ZoneId KST = ZoneId.of("Asia/Seoul");
+
+    private final UserRepository userRepository;
+    private final LessonRepository lessonRepository;
+    private final SubjectRepository subjectRepository;
+    private final ProfessorRepository professorRepository;
+    private final UserLessonRepository userLessonRepository;
+
+    public DataSeeder(UserRepository userRepository, LessonRepository lessonRepository, SubjectRepository subjectRepository, ProfessorRepository professorRepository, UserLessonRepository userLessonRepository) {
+        this.userRepository = userRepository;
+        this.lessonRepository = lessonRepository;
+        this.subjectRepository = subjectRepository;
+        this.professorRepository = professorRepository;
+        this.userLessonRepository = userLessonRepository;
+    }
+
+    @Override
+    @Transactional
+    public void run(String... args) throws Exception {
+        if(userRepository.count() > 0) {
+            return;
+        }
+
+        List<Professor> professors = professorRepository.saveAll(List.of(
+            new Professor("김영한"),
+            new Professor("최태영"),
+            new Professor("조재한")
+        ));
+
+        List<Subject> subjects = subjectRepository.saveAll(List.of(
+            new Subject("자바 프로그래밍", "CS201", "자바 프로그래밍 기초"),
+            new Subject("자료구조", "CS202", "자료구조 및 알고리즘"),
+            new Subject("데이터베이스", "CS203", "데이터베이스 시스템")
+        ));
+
+        Instant base = Instant.now().truncatedTo(ChronoUnit.HOURS);
+        List<Lesson> lessons = lessonRepository.saveAll(List.of(
+            new Lesson("자바 프로그래밍", subjects.get(0), professors.get(0), kst(3, 2, 9), kst(3, 2, 11)),
+            new Lesson("자료구조", subjects.get(1), professors.get(1), kst(3, 2, 13), kst(3, 2, 17)),
+            new Lesson("데이터베이스", subjects.get(2), professors.get(2), kst(3, 3, 10), kst(3, 3, 14))
+        ));
+
+        List<User> users = userRepository.saveAll(List.of(
+            new User("학생1", 1L, UserRole.STUDENT),
+            new User("학생2", 2L, UserRole.STUDENT),
+            new User("대학원생", 3L, UserRole.POSTGRADUATE)
+        ));
+
+        List<UserLesson> userLessons = userLessonRepository.saveAll(List.of(
+            new UserLesson(users.get(0), lessons.get(0)),
+            new UserLesson(users.get(0), lessons.get(1)),
+            new UserLesson(users.get(1), lessons.get(1)),
+            new UserLesson(users.get(2), lessons.get(2))
+        ));
+    }
+
+    private Instant kst(int month, int day, int hour) {
+        return ZonedDateTime.of(2026, month, day, hour, 0, 0, 0, KST).toInstant();
+    }
+    
+}

src/main/java/com/study/course_registration/service/CourseRegistrationService.java

@@ -0,0 +1,36 @@
+package com.study.course_registration.service;
+
+import org.springframework.stereotype.Service;
+
+import com.study.course_registration.dto.RequestDto;
+import com.study.course_registration.dto.ResponseDto;
+import com.study.course_registration.repository.LessonRepository;
+import com.study.course_registration.repository.UserLessonRepository;
+import com.study.course_registration.repository.UserRepository;
+import com.study.course_registration.repository.SubjectRepository;
+import com.study.course_registration.repository.ProfessorRepository;
+
+@Service
+public class CourseRegistrationService {
+    private final UserRepository userRepository;
+    private final LessonRepository lessonRepository;
+    private final SubjectRepository subjectRepository;
+    private final ProfessorRepository professorRepository;
+    private final UserLessonRepository userLessonRepository;
+
+    public CourseRegistrationService(UserRepository userRepository, LessonRepository lessonRepository, SubjectRepository subjectRepository, ProfessorRepository professorRepository, UserLessonRepository userLessonRepository) {
+        this.userRepository = userRepository;
+        this.lessonRepository = lessonRepository;
+        this.subjectRepository = subjectRepository;
+        this.professorRepository = professorRepository;
+        this.userLessonRepository = userLessonRepository;
+    }
+
+    public ResponseDto registerCourse(RequestDto requestDto) {
+        
+        return new ResponseDto();
+    }
+}
+// 저장 전 log
+// 검증 로직
+//