Fix quiz API URLs and verify exam flow

src/main/java/com/example/questionbank/repository/ExamAttemptRepository.java

@@ -2,6 +2,7 @@ package com.example.questionbank.repository;
 
 import com.example.questionbank.domain.ExamAttempt;
 import java.util.List;
+import java.util.List;
 import java.util.Optional;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -14,6 +15,8 @@ import org.springframework.stereotype.Repository;
  */
 @Repository
 public interface ExamAttemptRepository extends JpaRepository<ExamAttempt, Long> {
+    List<ExamAttempt> findAllByUserLogin(String login);
+
     @Query("select examAttempt from ExamAttempt examAttempt where examAttempt.user.login = ?#{authentication.name}")
     List<ExamAttempt> findByUserIsCurrentUser();
 

src/main/java/com/example/questionbank/repository/QuestionRepository.java

@@ -2,6 +2,7 @@ package com.example.questionbank.repository;
 
 import com.example.questionbank.domain.Question;
 import java.util.List;
+import java.util.List;
 import java.util.Optional;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -14,6 +15,8 @@ import org.springframework.stereotype.Repository;
  */
 @Repository
 public interface QuestionRepository extends JpaRepository<Question, Long> {
+    List<Question> findAllBySubjectIdAndActiveTrue(Long subjectId);
+
     default Optional<Question> findOneWithEagerRelationships(Long id) {
         return this.findOneWithToOneRelationships(id);
     }

src/main/java/com/example/questionbank/service/quiz/ExamScoringService.java

@@ -0,0 +1,15 @@
+package com.example.questionbank.service.quiz;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ExamScoringService {
+
+    public ScoringResult score(OptionKey correctOption, OptionKey selectedOption) {
+        boolean correct = selectedOption != null && selectedOption == correctOption;
+        return new ScoringResult(correct, correct ? 1 : 0);
+    }
+
+    public record ScoringResult(boolean correct, int awardedPoints) {}
+}

src/main/java/com/example/questionbank/service/quiz/QuizAttemptService.java

@@ -0,0 +1,285 @@
+package com.example.questionbank.service.quiz;
+
+import com.example.questionbank.domain.Choice;
+import com.example.questionbank.domain.ExamAnswer;
+import com.example.questionbank.domain.ExamAttempt;
+import com.example.questionbank.domain.Question;
+import com.example.questionbank.domain.Subject;
+import com.example.questionbank.domain.User;
+import com.example.questionbank.domain.enumeration.AttemptStatus;
+import com.example.questionbank.domain.enumeration.OptionKey;
+import com.example.questionbank.repository.ExamAnswerRepository;
+import com.example.questionbank.repository.ExamAttemptRepository;
+import com.example.questionbank.repository.QuestionRepository;
+import com.example.questionbank.repository.SubjectRepository;
+import com.example.questionbank.repository.UserRepository;
+import com.example.questionbank.web.rest.dto.AnswerResult;
+import com.example.questionbank.web.rest.dto.ChoiceView;
+import com.example.questionbank.web.rest.dto.ExamAttemptStartResult;
+import com.example.questionbank.web.rest.dto.ExamAttemptSummary;
+import com.example.questionbank.web.rest.dto.ExamQuestionView;
+import com.example.questionbank.web.rest.dto.ExamResult;
+import com.example.questionbank.web.rest.dto.SubmitAnswerRequest;
+import com.example.questionbank.web.rest.dto.SubmitExamRequest;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.server.ResponseStatusException;
+
+@Service
+public class QuizAttemptService {
+
+    private final ExamAttemptRepository attemptRepository;
+    private final ExamAnswerRepository answerRepository;
+    private final SubjectRepository subjectRepository;
+    private final QuestionRepository questionRepository;
+    private final UserRepository userRepository;
+    private final ExamScoringService scoringService;
+
+    public QuizAttemptService(
+        ExamAttemptRepository attemptRepository,
+        ExamAnswerRepository answerRepository,
+        SubjectRepository subjectRepository,
+        QuestionRepository questionRepository,
+        UserRepository userRepository,
+        ExamScoringService scoringService
+    ) {
+        this.attemptRepository = attemptRepository;
+        this.answerRepository = answerRepository;
+        this.subjectRepository = subjectRepository;
+        this.questionRepository = questionRepository;
+        this.userRepository = userRepository;
+        this.scoringService = scoringService;
+    }
+
+    // 1. 시험 응시 시작
+    @Transactional
+    public ExamAttemptStartResult start(Long subjectId, String login) {
+        Subject subject = subjectRepository
+            .findById(subjectId)
+            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "과목을 찾을 수 없습니다."));
+
+        if (!Boolean.TRUE.equals(subject.getActive())) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "비활성 과목은 응시할 수 없습니다.");
+        }
+
+        List<Question> activeQuestions = questionRepository.findAllBySubjectIdAndActiveTrue(subjectId);
+
+        if (activeQuestions.isEmpty()) {
+            throw new ResponseStatusException(HttpStatus.CONFLICT, "출제된 활성 문항이 없는 과목입니다.");
+        }
+
+        User user = userRepository
+            .findOneByLogin(login)
+            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "사용자를 찾을 수 없습니다."));
+
+        ExamAttempt attempt = new ExamAttempt();
+        attempt.setSubject(subject);
+        attempt.setUser(user);
+        attempt.setStartedAt(Instant.now());
+        attempt.setStatus(AttemptStatus.IN_PROGRESS);
+        attempt.setScore(0);
+
+        ExamAttempt saved = attemptRepository.save(attempt);
+
+        return new ExamAttemptStartResult(saved.getId(), saved.getStartedAt());
+    }
+
+    // 2. 시험 문제 조회 (정답 숨김)
+    @Transactional(readOnly = true)
+    public List<ExamQuestionView> getQuestions(Long attemptId, String login) {
+        ExamAttempt attempt = getOwnedAttempt(attemptId, login);
+
+        if (attempt.getStatus() != AttemptStatus.IN_PROGRESS) {
+            throw new ResponseStatusException(HttpStatus.CONFLICT, "진행 중인 응시만 문제를 조회할 수 있습니다.");
+        }
+
+        return questionRepository
+            .findAllBySubjectIdAndActiveTrue(attempt.getSubject().getId())
+            .stream()
+            .sorted(Comparator.comparing(Question::getId))
+            .map(question ->
+                new ExamQuestionView(
+                    question.getId(),
+                    question.getPrompt(),
+                    question
+                        .getChoices()
+                        .stream()
+                        .sorted(Comparator.comparing(Choice::getDisplayOrder))
+                        .map(choice -> new ChoiceView(choice.getOptionKey(), choice.getContent(), choice.getDisplayOrder()))
+                        .toList()
+                )
+            )
+            .toList();
+    }
+
+    // 3. 답안 제출 및 자동 채점
+    @Transactional
+    public ExamResult submit(Long attemptId, String login, SubmitExamRequest request) {
+        ExamAttempt attempt = getOwnedAttempt(attemptId, login);
+
+        if (attempt.getStatus() != AttemptStatus.IN_PROGRESS) {
+            throw new ResponseStatusException(HttpStatus.CONFLICT, "이미 제출된 응시입니다.");
+        }
+
+        Set<Long> seenQuestionIds = new HashSet<>();
+
+        Set<Long> requiredQuestionIds = questionRepository
+            .findAllBySubjectIdAndActiveTrue(attempt.getSubject().getId())
+            .stream()
+            .map(Question::getId)
+            .collect(Collectors.toSet());
+
+        List<AnswerResult> results = new ArrayList<>();
+        int totalScore = 0;
+
+        for (SubmitAnswerRequest answerRequest : request.answers()) {
+            if (!seenQuestionIds.add(answerRequest.questionId())) {
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "중복 제출된 문항이 있습니다.");
+            }
+
+            Question question = questionRepository
+                .findById(answerRequest.questionId())
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "문항을 찾을 수 없습니다."));
+
+            if (!Boolean.TRUE.equals(question.getActive()) || !question.getSubject().getId().equals(attempt.getSubject().getId())) {
+                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "응시할 수 없는 문항입니다.");
+            }
+
+            List<Choice> choices = new ArrayList<>(question.getChoices());
+
+            List<Choice> correctChoices = choices
+                .stream()
+                .filter(choice -> Boolean.TRUE.equals(choice.getCorrect()))
+                .toList();
+
+            Set<OptionKey> optionKeys = choices.stream().map(Choice::getOptionKey).collect(Collectors.toSet());
+
+            if (choices.size() != 4 || optionKeys.size() != 4 || correctChoices.size() != 1) {
+                throw new ResponseStatusException(HttpStatus.CONFLICT, "문항의 선택지 구성이 올바르지 않습니다.");
+            }
+
+            OptionKey selectedOption = answerRequest.selectedOption();
+
+            Choice selectedChoice =
+                selectedOption == null
+                    ? null
+                    : choices
+                          .stream()
+                          .filter(choice -> choice.getOptionKey() == selectedOption)
+                          .findFirst()
+                          .orElseThrow(() ->
+                              new ResponseStatusException(HttpStatus.BAD_REQUEST, "해당 문항에 존재하지 않는 선택지입니다.")
+                          );
+
+            ExamScoringService.ScoringResult score = scoringService.score(correctChoices.getFirst().getOptionKey(), selectedOption);
+
+            ExamAnswer answer = new ExamAnswer();
+            answer.setAttempt(attempt);
+            answer.setQuestion(question);
+            answer.setQuestionTextSnapshot(question.getPrompt());
+            answer.setExplanationSnapshot(question.getExplanation());
+            answer.setSelectedOption(selectedOption);
+            answer.setSelectedContentSnapshot(selectedChoice == null ? null : selectedChoice.getContent());
+            answer.setCorrect(score.correct());
+            answer.setAwardedPoints(score.awardedPoints());
+
+            answerRepository.save(answer);
+
+            totalScore += score.awardedPoints();
+
+            results.add(
+                new AnswerResult(
+                    question.getId(),
+                    question.getPrompt(),
+                    selectedOption,
+                    selectedChoice == null ? null : selectedChoice.getContent(),
+                    score.correct(),
+                    score.awardedPoints(),
+                    question.getExplanation()
+                )
+            );
+        }
+
+        if (!seenQuestionIds.equals(requiredQuestionIds)) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "과목의 모든 활성 문항을 빠짐없이 제출해야 합니다.");
+        }
+
+        Instant submittedAt = Instant.now();
+        attempt.setScore(totalScore);
+        attempt.setSubmittedAt(submittedAt);
+        attempt.setStatus(AttemptStatus.SUBMITTED);
+
+        return new ExamResult(attempt.getId(), totalScore, submittedAt, results);
+    }
+
+    // 4. 제출 완료된 시험 결과 조회
+    @Transactional(readOnly = true)
+    public ExamResult getResult(Long attemptId, String login) {
+        ExamAttempt attempt = getOwnedAttempt(attemptId, login);
+
+        if (attempt.getStatus() != AttemptStatus.SUBMITTED) {
+            throw new ResponseStatusException(HttpStatus.CONFLICT, "아직 제출되지 않은 응시입니다.");
+        }
+
+        List<AnswerResult> results = attempt
+            .getAnswers()
+            .stream()
+            .sorted(Comparator.comparing(a -> a.getQuestion().getId()))
+            .map(answer ->
+                new AnswerResult(
+                    answer.getQuestion().getId(),
+                    answer.getQuestionTextSnapshot(),
+                    answer.getSelectedOption(),
+                    answer.getSelectedContentSnapshot(),
+                    Boolean.TRUE.equals(answer.getCorrect()),
+                    answer.getAwardedPoints() == null ? 0 : answer.getAwardedPoints(),
+                    answer.getExplanationSnapshot()
+                )
+            )
+            .toList();
+
+        return new ExamResult(attempt.getId(), attempt.getScore() == null ? 0 : attempt.getScore(), attempt.getSubmittedAt(), results);
+    }
+
+    // 5. 로그인한 사용자의 응시 이력 조회
+    @Transactional(readOnly = true)
+    public List<ExamAttemptSummary> getMyAttempts(String login) {
+        return attemptRepository
+            .findAllByUserLogin(login)
+            .stream()
+            .sorted(Comparator.comparing(ExamAttempt::getStartedAt, Comparator.nullsLast(Comparator.reverseOrder())))
+            .map(attempt ->
+                new ExamAttemptSummary(
+                    attempt.getId(),
+                    attempt.getSubject().getId(),
+                    attempt.getSubject().getName(),
+                    attempt.getStartedAt(),
+                    attempt.getSubmittedAt(),
+                    attempt.getStatus(),
+                    attempt.getScore()
+                )
+            )
+            .toList();
+    }
+
+    // 6. 응시 기록 소유자 확인
+    private ExamAttempt getOwnedAttempt(Long attemptId, String login) {
+        ExamAttempt attempt = attemptRepository
+            .findById(attemptId)
+            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "응시를 찾을 수 없습니다."));
+
+        if (!attempt.getUser().getLogin().equals(login)) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "응시를 찾을 수 없습니다.");
+        }
+
+        return attempt;
+    }
+}

src/main/java/com/example/questionbank/web/rest/ExamAttemptResource.java

@@ -3,6 +3,13 @@ package com.example.questionbank.web.rest;
 import com.example.questionbank.repository.ExamAttemptRepository;
 import com.example.questionbank.service.ExamAttemptService;
 import com.example.questionbank.service.dto.ExamAttemptDTO;
+import com.example.questionbank.service.quiz.QuizAttemptService;
+import com.example.questionbank.web.rest.dto.ExamAttemptStartResult;
+import com.example.questionbank.web.rest.dto.ExamAttemptSummary;
+import com.example.questionbank.web.rest.dto.ExamQuestionView;
+import com.example.questionbank.web.rest.dto.ExamResult;
+import com.example.questionbank.web.rest.dto.StartExamRequest;
+import com.example.questionbank.web.rest.dto.SubmitExamRequest;
 import com.example.questionbank.web.rest.errors.BadRequestAlertException;
 import jakarta.validation.Valid;
 import jakarta.validation.constraints.NotNull;
@@ -17,7 +24,9 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 import tech.jhipster.web.util.HeaderUtil;
@@ -31,6 +40,8 @@ import tech.jhipster.web.util.ResponseUtil;
 @RequestMapping("/api/exam-attempts")
 public class ExamAttemptResource {
 
+    private final QuizAttemptService quizAttemptService;
+
     private static final Logger LOG = LoggerFactory.getLogger(ExamAttemptResource.class);
 
     private static final String ENTITY_NAME = "examAttempt";
@@ -42,9 +53,14 @@ public class ExamAttemptResource {
 
     private final ExamAttemptRepository examAttemptRepository;
 
-    public ExamAttemptResource(ExamAttemptService examAttemptService, ExamAttemptRepository examAttemptRepository) {
+    public ExamAttemptResource(
+        ExamAttemptService examAttemptService,
+        ExamAttemptRepository examAttemptRepository,
+        QuizAttemptService quizAttemptService
+    ) {
         this.examAttemptService = examAttemptService;
         this.examAttemptRepository = examAttemptRepository;
+        this.quizAttemptService = quizAttemptService;
     }
 
     /**
@@ -185,4 +201,43 @@ public class ExamAttemptResource {
             .headers(HeaderUtil.createEntityDeletionAlert(applicationName, true, ENTITY_NAME, id.toString()))
             .build();
     }
+
+    // 1. 시험 응시 시작
+    @PostMapping("/start")
+    public ResponseEntity<ExamAttemptStartResult> startExam(@Valid @RequestBody StartExamRequest request, Authentication authentication) {
+        ExamAttemptStartResult result = quizAttemptService.start(request.subjectId(), authentication.getName());
+
+        return ResponseEntity.status(HttpStatus.CREATED).body(result);
+    }
+
+    // 2. 시험 문제 조회
+    @GetMapping("/{attemptId}/questions")
+    public ResponseEntity<List<ExamQuestionView>> getExamQuestions(
+        @PathVariable("attemptId") Long attemptId,
+        Authentication authentication
+    ) {
+        return ResponseEntity.ok(quizAttemptService.getQuestions(attemptId, authentication.getName()));
+    }
+
+    // 3. 답안 제출 및 자동 채점
+    @PostMapping("/{attemptId}/submit")
+    public ResponseEntity<ExamResult> submitExam(
+        @PathVariable("attemptId") Long attemptId,
+        @Valid @RequestBody SubmitExamRequest request,
+        Authentication authentication
+    ) {
+        return ResponseEntity.ok(quizAttemptService.submit(attemptId, authentication.getName(), request));
+    }
+
+    // 4. 제출된 시험 결과 조회
+    @GetMapping("/{attemptId}/result")
+    public ResponseEntity<ExamResult> getExamResult(@PathVariable("attemptId") Long attemptId, Authentication authentication) {
+        return ResponseEntity.ok(quizAttemptService.getResult(attemptId, authentication.getName()));
+    }
+
+    // 5. 내 응시 이력 조회
+    @GetMapping("/my")
+    public ResponseEntity<List<ExamAttemptSummary>> getMyExamAttempts(Authentication authentication) {
+        return ResponseEntity.ok(quizAttemptService.getMyAttempts(authentication.getName()));
+    }
 }

src/main/java/com/example/questionbank/web/rest/dto/AnswerResult.java

@@ -0,0 +1,13 @@
+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+
+public record AnswerResult(
+    Long questionId,
+    String questionText,
+    OptionKey selectedOption,
+    String selectedContent,
+    boolean correct,
+    int awardedPoints,
+    String explanation
+) {}

src/main/java/com/example/questionbank/web/rest/dto/ChoiceView.java

@@ -0,0 +1,5 @@
+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+
+public record ChoiceView(OptionKey optionKey, String content, Integer displayOrder) {}

src/main/java/com/example/questionbank/web/rest/dto/ExamAttemptStartResult.java

@@ -0,0 +1,5 @@
+package com.example.questionbank.web.rest.dto;
+
+import java.time.Instant;
+
+public record ExamAttemptStartResult(Long attemptId, Instant startedAt) {}

src/main/java/com/example/questionbank/web/rest/dto/ExamAttemptSummary.java

@@ -0,0 +1,14 @@
+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.AttemptStatus;
+import java.time.Instant;
+
+public record ExamAttemptSummary(
+    Long attemptId,
+    Long subjectId,
+    String subjectName,
+    Instant startedAt,
+    Instant submittedAt,
+    AttemptStatus status,
+    Integer score
+) {}

src/main/java/com/example/questionbank/web/rest/dto/ExamQuestionView.java

@@ -0,0 +1,5 @@
+package com.example.questionbank.web.rest.dto;
+
+import java.util.List;
+
+public record ExamQuestionView(Long questionId, String prompt, List<ChoiceView> choices) {}

src/main/java/com/example/questionbank/web/rest/dto/ExamResult.java

@@ -0,0 +1,6 @@
+package com.example.questionbank.web.rest.dto;
+
+import java.time.Instant;
+import java.util.List;
+
+public record ExamResult(Long attemptId, int totalScore, Instant submittedAt, List<AnswerResult> answers) {}

src/main/java/com/example/questionbank/web/rest/dto/StartExamRequest.java

@@ -0,0 +1,5 @@
+package com.example.questionbank.web.rest.dto;
+
+import jakarta.validation.constraints.NotNull;
+
+public record StartExamRequest(@NotNull Long subjectId) {}

src/main/java/com/example/questionbank/web/rest/dto/SubmitAnswerRequest.java

@@ -0,0 +1,6 @@
+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+import jakarta.validation.constraints.NotNull;
+
+public record SubmitAnswerRequest(@NotNull Long questionId, OptionKey selectedOption) {}

src/main/java/com/example/questionbank/web/rest/dto/SubmitExamRequest.java

@@ -0,0 +1,7 @@
+package com.example.questionbank.web.rest.dto;
+
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotEmpty;
+import java.util.List;
+
+public record SubmitExamRequest(@NotEmpty List<@Valid SubmitAnswerRequest> answers) {}

src/main/webapp/app/entities/choice/choice-update.component.ts

@@ -48,7 +48,7 @@ export default defineComponent({
 
     const initRelationships = () => {
       questionService()
-        .retrieve()
+        .retrieve({ page: 0, size: 100 })
         .then(res => {
           questions.value = res.data;
         });

src/main/webapp/app/entities/question/question-update.component.ts

@@ -46,7 +46,7 @@ export default defineComponent({
 
     const initRelationships = () => {
       subjectService()
-        .retrieve()
+        .retrieve({ page: 0, size: 100 })
         .then(res => {
           subjects.value = res.data;
         });

src/main/webapp/app/entities/subject/subject-update.component.ts

@@ -70,7 +70,14 @@ export default defineComponent({
   created(): void {},
   methods: {
     save(): void {
+      const message = this.subject.id ? '이 과목의 수정 내용을 저장하시겠습니까?' : '새 과목을 등록하시겠습니까?';
+
+      if (!window.confirm(message)) {
+        return;
+      }
+
       this.isSaving = true;
+
       if (this.subject.id) {
         this.subjectService()
           .update(this.subject)

src/main/webapp/app/entities/subject/subject.component.ts

@@ -13,7 +13,7 @@ export default defineComponent({
     const subjectService = inject('subjectService', () => new SubjectService());
     const alertService = inject('alertService', () => useAlertService(), true);
 
-    const itemsPerPage = ref(20);
+    const itemsPerPage = ref(10);
     const queryCount: Ref<number> = ref(null);
     const page: Ref<number> = ref(1);
     const propOrder = ref('id');

src/main/webapp/app/entities/subject/subject.vue

@@ -52,7 +52,7 @@
             <td>
               <router-link :to="{ name: 'SubjectView', params: { subjectId: subject.id } }">{{ subject.id }}</router-link>
             </td>
-            <td>{{ subject.name }}</td>
+            <td>📘{{ subject.name }}</td>
             <td>{{ subject.description }}</td>
             <td>{{ subject.active }}</td>
             <td class="text-end">
@@ -106,7 +106,11 @@
         <jhi-item-count :page="page" :total="queryCount" :items-per-page="itemsPerPage"></jhi-item-count>
       </div>
       <div class="d-flex justify-content-center">
-        <b-pagination size="md" :total-rows="totalItems" v-model="page" :per-page="itemsPerPage"></b-pagination>
+        <p>전체 과목 수: {{ totalItems }}개</p>
+      </div>
+
+      <div class="d-flex justify-content-center">
+        <b-pagination :total-rows="totalItems" v-model="page" :per-page="itemsPerPage"></b-pagination>
       </div>
     </div>
   </div>

src/main/webapp/app/quiz/quiz.component.ts

@@ -0,0 +1,100 @@
+import { defineComponent, onMounted, ref } from 'vue';
+import {
+  type ExamQuestionView,
+  type ExamResult,
+  type OptionKey,
+  type SubjectItem,
+  fetchActiveSubjects,
+  loadQuestions,
+  startExam,
+  submitExam,
+} from './quiz.service';
+
+export default defineComponent({
+  name: 'QuizView',
+  setup() {
+    const subjects = ref<SubjectItem[]>([]);
+    const selectedSubjectId = ref<number | null>(null);
+    const attemptId = ref<number | null>(null);
+    const questions = ref<ExamQuestionView[]>([]);
+    const selectedAnswers = ref<Record<number, OptionKey | null>>({});
+    const result = ref<ExamResult | null>(null);
+    const errorMessage = ref<string | null>(null);
+    const loading = ref(false);
+
+    onMounted(async () => {
+      try {
+        subjects.value = await fetchActiveSubjects();
+      } catch {
+        errorMessage.value = '과목 목록을 불러오지 못했습니다.';
+      }
+    });
+
+    const handleStartExam = async () => {
+      if (!selectedSubjectId.value) return;
+
+      errorMessage.value = null;
+      loading.value = true;
+
+      try {
+        const started = await startExam(selectedSubjectId.value);
+        attemptId.value = started.attemptId;
+
+        const loadedQuestions = await loadQuestions(started.attemptId);
+        questions.value = loadedQuestions;
+        selectedAnswers.value = {};
+
+        loadedQuestions.forEach(q => {
+          selectedAnswers.value[q.questionId] = null;
+        });
+      } catch (err: any) {
+        errorMessage.value = err?.response?.data?.detail || '응시를 시작할 수 없습니다.';
+        attemptId.value = null;
+      } finally {
+        loading.value = false;
+      }
+    };
+
+    const handleSubmitExam = async () => {
+      if (!attemptId.value) return;
+
+      errorMessage.value = null;
+      loading.value = true;
+
+      try {
+        const payload = questions.value.map(q => ({
+          questionId: q.questionId,
+          selectedOption: selectedAnswers.value[q.questionId] ?? null,
+        }));
+
+        result.value = await submitExam(attemptId.value, payload);
+      } catch (err: any) {
+        errorMessage.value = err?.response?.data?.detail || '답안 제출 중 오류가 발생했습니다.';
+      } finally {
+        loading.value = false;
+      }
+    };
+
+    const resetQuiz = () => {
+      attemptId.value = null;
+      questions.value = [];
+      selectedAnswers.value = {};
+      result.value = null;
+      errorMessage.value = null;
+    };
+
+    return {
+      subjects,
+      selectedSubjectId,
+      attemptId,
+      questions,
+      selectedAnswers,
+      result,
+      errorMessage,
+      loading,
+      handleStartExam,
+      handleSubmitExam,
+      resetQuiz,
+    };
+  },
+});

src/main/webapp/app/quiz/quiz.service.ts

@@ -0,0 +1,64 @@
+import axios from 'axios';
+
+export type OptionKey = 'A' | 'B' | 'C' | 'D';
+
+export interface SubjectItem {
+  id: number;
+  name: string;
+  description?: string;
+  active: boolean;
+}
+
+export interface ChoiceView {
+  optionKey: OptionKey;
+  content: string;
+  displayOrder: number;
+}
+
+export interface ExamQuestionView {
+  questionId: number;
+  prompt: string;
+  choices: ChoiceView[];
+}
+
+export interface SubmitAnswer {
+  questionId: number;
+  selectedOption: OptionKey | null;
+}
+
+export interface AnswerResult {
+  questionId: number;
+  questionText: string;
+  selectedOption: OptionKey | null;
+  selectedContent: string | null;
+  correct: boolean;
+  awardedPoints: number;
+  explanation?: string;
+}
+
+export interface ExamResult {
+  attemptId: number;
+  totalScore: number;
+  submittedAt: string;
+  answers: AnswerResult[];
+}
+
+export async function fetchActiveSubjects(): Promise<SubjectItem[]> {
+  const response = await axios.get<SubjectItem[]>('api/subjects?page=0&size=100');
+  return response.data.filter(s => s.active);
+}
+
+export async function startExam(subjectId: number): Promise<{ attemptId: number; startedAt: string }> {
+  const response = await axios.post('api/exam-attempts/start', { subjectId });
+  return response.data;
+}
+
+export async function loadQuestions(attemptId: number): Promise<ExamQuestionView[]> {
+  const response = await axios.get<ExamQuestionView[]>(`api/exam-attempts/${attemptId}/questions`);
+  return response.data;
+}
+
+export async function submitExam(attemptId: number, answers: SubmitAnswer[]): Promise<ExamResult> {
+  const response = await axios.post<ExamResult>(`api/exam-attempts/${attemptId}/submit`, { answers });
+  return response.data;
+}

src/main/webapp/app/quiz/quiz.vue

@@ -0,0 +1,78 @@
+<template>
+  <div class="container mt-4">
+    <h2>온라인 문제 풀이</h2>
+
+    <div v-if="errorMessage" class="alert alert-danger mt-3">
+      {{ errorMessage }}
+    </div>
+
+    <!-- 1단계: 과목 선택 -->
+    <div v-if="!attemptId" class="card p-4 mt-3">
+      <h4>응시할 과목을 선택하세요</h4>
+
+      <div class="form-group mt-2">
+        <select v-model="selectedSubjectId" class="form-control">
+          <option :value="null" disabled>-- 과목 선택 --</option>
+          <option v-for="subject in subjects" :key="subject.id" :value="subject.id">
+            {{ subject.name }}
+          </option>
+        </select>
+      </div>
+
+      <button class="btn btn-primary mt-3" :disabled="!selectedSubjectId || loading" @click="handleStartExam">응시 시작</button>
+    </div>
+
+    <!-- 2단계: 문제 풀이 -->
+    <div v-if="attemptId && !result" class="mt-3">
+      <div v-for="(q, index) in questions" :key="q.questionId" class="card p-3 mb-3">
+        <h5>문제 {{ index + 1 }}. {{ q.prompt }}</h5>
+
+        <div v-for="choice in q.choices" :key="choice.optionKey" class="form-check mt-2">
+          <input
+            :id="'q-' + q.questionId + '-' + choice.optionKey"
+            v-model="selectedAnswers[q.questionId]"
+            class="form-check-input"
+            type="radio"
+            :name="'question-' + q.questionId"
+            :value="choice.optionKey"
+          />
+
+          <label class="form-check-label" :for="'q-' + q.questionId + '-' + choice.optionKey">
+            <strong>{{ choice.optionKey }}.</strong>
+            {{ choice.content }}
+          </label>
+        </div>
+      </div>
+
+      <button class="btn btn-success" :disabled="loading" @click="handleSubmitExam">답안 제출 및 채점</button>
+    </div>
+
+    <!-- 3단계: 채점 결과 -->
+    <div v-if="result" class="card p-4 mt-3">
+      <h3>채점 결과: 총점 {{ result.totalScore }} / {{ result.answers.length }}점</h3>
+
+      <p class="text-muted">제출 시각: {{ result.submittedAt }}</p>
+
+      <div v-for="(ans, idx) in result.answers" :key="ans.questionId" class="border-top pt-3 mt-3">
+        <h5>
+          문제 {{ idx + 1 }}. {{ ans.questionText }}
+
+          <span :class="ans.correct ? 'badge bg-success' : 'badge bg-danger'">
+            {{ ans.correct ? '정답 (+1점)' : '오답 (0점)' }}
+          </span>
+        </h5>
+
+        <p class="mb-1">
+          내 선택:
+          {{ ans.selectedOption ? `${ans.selectedOption} (${ans.selectedContent})` : '무응답' }}
+        </p>
+
+        <p v-if="ans.explanation" class="text-info mb-0"><strong>해설:</strong> {{ ans.explanation }}</p>
+      </div>
+
+      <button class="btn btn-secondary mt-4" @click="resetQuiz">다른 과목 응시하기</button>
+    </div>
+  </div>
+</template>
+
+<script lang="ts" src="./quiz.component.ts"></script>

src/main/webapp/app/router/index.ts

@@ -7,6 +7,8 @@ import admin from '@/router/admin';
 import entities from '@/router/entities';
 import pages from '@/router/pages';
 
+const QuizView = () => import('@/quiz/quiz.vue');
+
 export const createRouter = () =>
   createVueRouter({
     history: createWebHistory(),
@@ -28,6 +30,12 @@ export const createRouter = () =>
         component: Error,
         meta: { error404: true },
       },
+      {
+        path: '/quiz',
+        name: 'QuizView',
+        component: QuizView,
+        meta: { authorities: ['ROLE_USER'] },
+      },
       ...account,
       ...admin,
       entities,

src/test/java/com/example/questionbank/service/quiz/ExamScoringServiceTest.java

@@ -0,0 +1,37 @@
+package com.example.questionbank.service.quiz;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+import org.junit.jupiter.api.Test;
+
+class ExamScoringServiceTest {
+
+    private final ExamScoringService service = new ExamScoringService();
+
+    @Test
+    void correctAnswerGetsOnePoint() {
+        var result = service.score(OptionKey.A, OptionKey.A);
+
+        assertTrue(result.correct());
+        assertEquals(1, result.awardedPoints());
+    }
+
+    @Test
+    void wrongAnswerGetsZeroPoints() {
+        var result = service.score(OptionKey.A, OptionKey.D);
+
+        assertFalse(result.correct());
+        assertEquals(0, result.awardedPoints());
+    }
+
+    @Test
+    void unansweredQuestionGetsZeroPoints() {
+        var result = service.score(OptionKey.A, null);
+
+        assertFalse(result.correct());
+        assertEquals(0, result.awardedPoints());
+    }
+}