Javaを使ってオンライン試験システムの問題用紙配布機能を構築する方法

public class ExamPaper {
    private int id;
    private String name;
    private String subject;
    private Date examTime;
    // 省略getter和setter方法
}

public interface ExamPaperService {
    void upload(ExamPaper paper); // 上传试卷
    List<ExamPaper> getAllPapers(); // 获取所有试卷
    ExamPaper getPaperById(int id); // 根据ID获取试卷
}

@Service
public class ExamPaperServiceImpl implements ExamPaperService {
    private List<ExamPaper> papers = new ArrayList<>();

    @Override
    public void upload(ExamPaper paper) {
        papers.add(paper);
    }

    @Override
    public List<ExamPaper> getAllPapers() {
        return papers;
    }

    @Override
    public ExamPaper getPaperById(int id) {
        for (ExamPaper paper : papers) {
            if (paper.getId() == id) {
                return paper;
            }
        }
        return null;
    }
}

public interface ExamPaperDistributionService {
    void distribute(int paperId, String[] receiverIds); // 分发试卷给指定的考生
}

@Service
public class ExamPaperDistributionServiceImpl implements ExamPaperDistributionService {
    @Autowired
    private ExamPaperService examPaperService;
    
    @Override
    public void distribute(int paperId, String[] receiverIds) {
        ExamPaper paper = examPaperService.getPaperById(paperId);
        if (paper == null) {
            throw new RuntimeException("试卷不存在");
        }
        
        for (String receiverId : receiverIds) {
            // TODO: 将试卷分发给指定的考生，可以使用消息队列、邮件通知等方式
            System.out.println("将试卷[" + paper.getName() + "]分发给考生[" + receiverId + "]");
        }
    }
}