qt实现http文件上传下载

你可以使用Qt网络模块来实现HTTP文件的上传和下载。下面是一个简单的示例代码，演示了如何使用Qt实现文件的上传和下载：

文件上传：

QFile file("path/to/file");  // 替换为要上传的文件的路径
if (!file.open(QIODevice::ReadOnly)) {
    qDebug() << "Failed to open file for reading";
    return;
}

QNetworkAccessManager manager;
QNetworkRequest request(QUrl("http://example.com/upload"));  // 替换为服务器的上传接口URL
QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

QHttpPart filePart;
filePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"file\"; filename=\"" + file.fileName() + "\""));
filePart.setBodyDevice(&file);
file.setParent(multiPart);
multiPart->append(filePart);

QNetworkReply *reply = manager.post(request, multiPart);
multiPart->setParent(reply);

QObject::connect(reply, &QNetworkReply::finished, [&]() {
    if (reply->error() == QNetworkReply::NoError) {
        qDebug() << "File uploaded successfully";
    } else {
        qDebug() << "Failed to upload file:" << reply->errorString();
    }
    reply->deleteLater();
});

文件下载：

QNetworkAccessManager manager;
QNetworkRequest request(QUrl("http://example.com/download"));  // 替换为服务器的下载接口URL

QNetworkReply *reply = manager.get(request);
QObject::connect(reply, &QNetworkReply::finished, [&]() {
    if (reply->error() == QNetworkReply::NoError) {
        QFile file("path/to/save/file");  // 替换为要保存的文件的路径
        if (!file.open(QIODevice::WriteOnly)) {
            qDebug() << "Failed to open file for writing";
            reply->deleteLater();
            return;
        }
        file.write(reply->readAll());
        file.close();
        qDebug() << "File downloaded successfully";
    } else {
        qDebug() << "Failed to download file:" << reply->errorString();
    }
    reply->deleteLater();
});

请注意，以上代码仅为示例，你需要根据实际情况修改URL和文件路径。此外，为了便于处理文件上传，我们使用了`QHttpMultiPart`类。