Java在线考试系统开发教程

public class User {
    private Long id;
    private String username;
    private String password;
    private String role; // STUDENT, TEACHER, ADMIN
    // getter 和 setter
}

@Configuration
@EnableWebSecurity
public class SecurityConfig {
    
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authz -> authz
                .requestMatchers("/admin/**").hasRole("ADMIN")
                .requestMatchers("/teacher/**").hasRole("TEACHER")
                .requestMatchers("/student/**").hasRole("STUDENT")
                .anyRequest().permitAll()
            )
            .formLogin();
        return http.build();
    }
}

public class Question {
    private Long id;
    private String content;
    private String options; // JSON格式存储选项
    private String answer;
    private String type; // SINGLE_CHOICE, MULTI_CHOICE, JUDGE
    private Integer score;
}

@RestController
@RequestMapping("/teacher")
public class TeacherController {

    @Autowired
    private QuestionService questionService;

    @PostMapping("/questions")
    public ResponseEntity addQuestion(@RequestBody Question question) {
        questionService.save(question);
        return ResponseEntity.ok("题目添加成功");
    }

    @PostMapping("/exams")
    public ResponseEntity createExam(@RequestBody Exam exam) {
        // 随机组题或手动指定
        List questions = questionService.randomSelect(20);
        exam.setQuestions(questions);
        examService.save(exam);
        return ResponseEntity.ok(exam);
    }
}

@Service
public class ExamService {

    @Autowired
    private RedisTemplate redisTemplate;

    public void startExam(Long studentId, Long examId) {
        String key = "exam:" + studentId + ":" + examId;
        redisTemplate.opsForValue().set(key, "started", Duration.ofHours(2));
    }

    public boolean isExamExpired(Long studentId, Long examId) {
        String key = "exam:" + studentId + ":" + examId;
        return redisTemplate.hasKey(key);
    }
}

public int autoGrade(Exam exam, Map studentAnswers) {
    int totalScore = 0;
    for (Question q : exam.getQuestions()) {
        if (q.getAnswer().equals(studentAnswers.get(q.getId()))) {
            totalScore += q.getScore();
        }
    }
    return totalScore;
}

@Entity
public class Score {
    @Id
    @GeneratedValue
    private Long id;
    private Long studentId;
    private Long examId;
    private Integer score;
    private Date submitTime;
}