1、直接建立连接，向网站发送http请求

QNetworkAccessManager *accessManager = new QNetworkAccessManager(this);
connect(accessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
accessManager->get(QNetworkRequest(QUrl("http:xxxxx")));

2、在槽函数中打印【注意：如果返回字节数过大,qDebug是打印不出来的,可通过size查看返回字节数】

void MainWindow::replyFinished(QNetworkReply *reply)
{
if (reply->error() == QNetworkReply::NoError)
{
QByteArray bytes = reply->readAll();
qDebug() << bytes; } else { qDebug() << "finishedSlot errors here"; qDebug( "found error …. code: %d\n", (int)reply->error());
qDebug(qPrintable(reply->errorString()));
}
}