qt5服务器接收发送文件

要实现Qt5服务器接收和发送文件，可以使用Qt的网络模块以及文件输入输出模块。以下是一个简单的示例：

1. 接收文件

服务器端：

QTcpSocket* clientConnection; // 已连接的客户端套接字

void MyServer::readyRead() {
    QByteArray block = clientConnection->readAll(); // 读取客户端发送的数据
    QDataStream in(&block, QIODevice::ReadOnly);
    in.setVersion(QDataStream::Qt_5_9);

    if (block.size() == sizeof(quint64)) { // 如果是文件大小信息
        in >> totalBytes;
        bytesReceived = 0;
        qDebug() << "Total bytes: " << totalBytes;
        // 打开一个文件，准备写入数据
        localFile = new QFile(fileName);
        if (!localFile->open(QFile::WriteOnly)) {
            qDebug() << "Server: open file error!";
            return;
        }
    } else if (bytesReceived < totalBytes) { // 如果是文件数据
        bytesReceived += clientConnection->bytesAvailable();
        inBlock = clientConnection->readAll();
        localFile->write(inBlock);
        inBlock.resize(0);
        qDebug() << "Bytes received: " << bytesReceived;
    }
}

客户端：

QTcpSocket* tcpSocket; // 已连接的服务器套接字
QFile* localFile; // 要发送的文件指针
QByteArray outBlock; // 存储文件数据的字节数组
qint64 fileSize; // 文件大小

void MyClient::sendFile() {
    tcpSocket->connectToHost(ipAddr, portNum);
    if (!tcpSocket->waitForConnected()) {
        qDebug() << "Client: connect error!";
        return;
    }

    localFile = new QFile(filePath);
    if (!localFile->open(QFile::ReadOnly)) {
        qDebug() << "Client: open file error!";
        return;
    }

    fileSize = localFile->size();

    outBlock.resize(sizeof(qint64));
    QDataStream out(&outBlock, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_9);
    out << fileSize; // 先发送文件大小信息

    tcpSocket->write(outBlock); // 发送文件大小信息
    outBlock.resize(0);

    while (!localFile->atEnd()) { // 发送文件数据
        outBlock = localFile->read(qMin(bytesToWrite, fileSize - bytesWritten));
        bytesWritten += tcpSocket->write(outBlock);
        outBlock.resize(0);
        qDebug() << "Bytes written: " << bytesWritten;
    }

    localFile->close();
    tcpSocket->close();
}

2. 发送文件

服务器端：

QTcpSocket* clientConnection; // 已连接的客户端套接字
QFile* localFile; // 要发送的文件指针
QByteArray outBlock; // 存储文件数据的字节数组
qint64 fileSize; // 文件大小

void MyServer::sendFile() {
    clientConnection->connectToHost(ipAddr, portNum);
    if (!clientConnection->waitForConnected()) {
        qDebug() << "Server: connect error!";
        return;
    }

    localFile = new QFile(filePath);
    if (!localFile->open(QFile::ReadOnly)) {
        qDebug() << "Server: open file error!";
        return;
    }

    fileSize = localFile->size();

    outBlock.resize(sizeof(qint64));
    QDataStream out(&outBlock, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_9);
    out << fileSize; // 先发送文件大小信息

    clientConnection->write(outBlock); // 发送文件大小信息
    outBlock.resize(0);

    while (!localFile->atEnd()) { // 发送文件数据
        outBlock = localFile->read(qMin(bytesToWrite, fileSize - bytesWritten));
        bytesWritten += clientConnection->write(outBlock);
        outBlock.resize(0);
        qDebug() << "Bytes written: " << bytesWritten;
    }

    localFile->close();
    clientConnection->close();
}

客户端：

QTcpSocket* tcpSocket; // 已连接的服务器套接字

void MyClient::readyRead() {
    QByteArray block = tcpSocket->readAll(); // 读取服务器发送的数据
    QDataStream in(&block, QIODevice::ReadOnly);
    in.setVersion(QDataStream::Qt_5_9);

    if (block.size() == sizeof(quint64)) { // 如果是文件大小信息
        in >> totalBytes;
        bytesReceived = 0;
        qDebug() << "Total bytes: " << totalBytes;
        // 打开一个文件，准备写入数据
        localFile = new QFile(fileName);
        if (!localFile->open(QFile::WriteOnly)) {
            qDebug() << "Client: open file error!";
            return;
        }
    } else if (bytesReceived < totalBytes) { // 如果是文件数据
        bytesReceived += tcpSocket->bytesAvailable();
        inBlock = tcpSocket->readAll();
        localFile->write(inBlock);
        inBlock.resize(0);
        qDebug() << "Bytes received: " << bytesReceived;
    }
}

以上代码仅供参考，需要根据实际需求进行修改。