qt实现同时传输多个文件的应用，要求串行和并行两种事项时

实现同时传输多个文件的应用，可以使用 Qt 的网络模块，通过 TCP 或 UDP 协议进行传输。在传输多个文件时，可以使用多线程技术实现并行传输，也可以使用阻塞式 IO 实现串行传输。

下面是实现串行和并行两种方式的示例代码：

串行传输示例代码：

// 文件传输客户端类
class FileTransferClient : public QObject {
    Q_OBJECT
public:
    FileTransferClient(QObject *parent = nullptr) : QObject(parent) {}

    // 串行传输
    void transmitFilesSerially(const QStringList &filePaths, const QUrl &url) {
        for (const auto &filePath : filePaths) {
            QFile file(filePath);
            if (!file.open(QIODevice::ReadOnly)) {
                qWarning() << "Cannot open file" << filePath << ":" << file.errorString();
                continue;
            }

            QByteArray data = file.readAll();
            file.close();

            QNetworkRequest request(url);
            request.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");

            QNetworkAccessManager manager;
            QNetworkReply *reply = manager.post(request, data);

            QEventLoop loop;
            connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
            loop.exec();

            if (reply->error() != QNetworkReply::NoError) {
                qWarning() << "Network error:" << reply->errorString();
            }

            reply->deleteLater();
        }
    }
};

// 使用示例
FileTransferClient client;
client.transmitFilesSerially(QStringList{"/path/to/file1", "/path/to/file2"}, QUrl("http://example.com/upload"));

并行传输示例代码：

// 文件传输客户端类
class FileTransferClient : public QObject {
    Q_OBJECT
public:
    FileTransferClient(QObject *parent = nullptr) : QObject(parent) {}

    // 并行传输
    void transmitFilesInParallel(const QStringList &filePaths, const QUrl &url) {
        QThreadPool *threadPool = QThreadPool::globalInstance();
        threadPool->setMaxThreadCount(filePaths.size());

        for (const auto &filePath : filePaths) {
            threadPool->start(new FileTransferTask(filePath, url));
        }

        threadPool->waitForDone();
    }

private:
    // 文件传输任务类
    class FileTransferTask : public QRunnable {
    public:
        FileTransferTask(const QString &filePath, const QUrl &url) : m_filePath(filePath), m_url(url) {}

        void run() override {
            QFile file(m_filePath);
            if (!file.open(QIODevice::ReadOnly)) {
                qWarning() << "Cannot open file" << m_filePath << ":" << file.errorString();
                return;
            }

            QByteArray data = file.readAll();
            file.close();

            QNetworkRequest request(m_url);
            request.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");

            QNetworkAccessManager manager;
            QNetworkReply *reply = manager.post(request, data);

            QEventLoop loop;
            connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
            loop.exec();

            if (reply->error() != QNetworkReply::NoError) {
                qWarning() << "Network error:" << reply->errorString();
            }

            reply->deleteLater();
        }

    private:
        QString m_filePath;
        QUrl m_url;
    };
};

// 使用示例
FileTransferClient client;
client.transmitFilesInParallel(QStringList{"/path/to/file1", "/path/to/file2"}, QUrl("http://example.com/upload"));