QNetwork

QNetworkAccessManager* mNetworkAccessManager = new QNetworkAccessManager(this);

QUrl url = QUrl("http://");
mNetworkAccessManager->get(QNetworkRequest(url));

connect(mNetworkAccessManager, &QNetworkAccessManager::finished, this, &MainWindow::onReplied);

void MainWindow::onReplied(QNetworkReply *reply)
{
    //状态码
    int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
    //判断是否请求成功
    if (reply->error() != QNetworkReply::NoError || statusCode != 200) {
        QMessageBox::warning(this, "错误", reply->errorString(), QMessageBox::Ok);
    }
    else
    {
        //解析数据
        QByteArray requestData = reply->readAll();
        qDebug() << requestData.data();
    }
    //释放内存
    reply->deleteLater();
}