帮我写一个在qt上运行的能够实现文件传输的TCP服务端，实现多客户端之间的文件传输

好的，以下是一个在Qt上运行的能够实现文件传输的TCP服务端，可以实现多客户端之间的文件传输的基本代码：

#include <QtNetwork>
#include <QObject>
#include <QTcpServer>
#include <QTcpSocket>
#include <QFile>

class Server : public QObject
{
    Q_OBJECT

public:
    explicit Server(QObject *parent = nullptr);
    void start();

private slots:
    void onNewConnection();
    void onReadyRead();
    void onDisconnected();

private:
    QTcpServer *m_tcpServer;
    QList<QTcpSocket*> m_clients;
};

Server::Server(QObject *parent) : QObject(parent)
{
    m_tcpServer = new QTcpServer(this);
    connect(m_tcpServer, &QTcpServer::newConnection, this, &Server::onNewConnection);
}

void Server::start()
{
    if (!m_tcpServer->listen(QHostAddress::Any, 5555)) {
        qDebug() << "Error: Could not start server.";
        return;
    }

    qDebug() << "Server started.";
}

void Server::onNewConnection()
{
    QTcpSocket *client = m_tcpServer->nextPendingConnection();
    m_clients.append(client);
    connect(client, &QTcpSocket::readyRead, this, &Server::onReadyRead);
    connect(client, &QTcpSocket::disconnected, this, &Server::onDisconnected);
    qDebug() << "New client connected.";
}

void Server::onReadyRead()
{
    QTcpSocket *client = qobject_cast<QTcpSocket*>(sender());
    QByteArray data = client->readAll();
    qDebug() << "Received: " << data;

    // Write file to disk
    QFile file("received_file.txt");
    if (file.open(QIODevice::WriteOnly)) {
        file.write(data);
        file.close();
        qDebug() << "File saved to disk.";
    }

    // Send file to all clients
    for (QTcpSocket *client : m_clients) {
        client->write("File received.");
        client->write(data);
    }
}

void Server::onDisconnected()
{
    QTcpSocket *client = qobject_cast<QTcpSocket*>(sender());
    m_clients.removeOne(client);
    qDebug() << "Client disconnected.";
    client->deleteLater();
}

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    Server server;
    server.start();

    return app.exec();
}

#include "main.moc"

这个服务端程序监听5555端口，当有客户端连接进来时，会将其加入客户端列表中。当某个客户端发送一个文件时，服务端会将该文件保存到磁盘上，并将该文件发送给所有已连接的客户端。你可以根据实际需求修改代码来实现更复杂的功能。