MoonL

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QTcpSocket *socket = new QTcpSocket(this);
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connect(socket, &QTcpSocket::connected, this, &Client::onConnected);
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connect(socket, &QTcpSocket::readyRead, this, &Client::onReadyRead);
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connect(socket, &QTcpSocket::errorOccurred, this, &Client::onError);
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socket->connectToHost("example.com", 80);
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// 连接成功后
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socket->write("GET / HTTP/1.0\r\n\r\n");

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void Client::onReadyRead()
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{
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    QByteArray data = socket->readAll();
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    // 处理数据；注意 TCP 流式，需自行组包或定长协议
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}

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QTcpServer *server = new QTcpServer(this);
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connect(server, &QTcpServer::newConnection, this, &Server::onNewConnection);
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server->listen(QHostAddress::Any, 8080);
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void Server::onNewConnection()
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{
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    QTcpSocket *client = server->nextPendingConnection();
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    connect(client, &QTcpSocket::readyRead, this, [client]() {
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        qDebug() << client->readAll();
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    });
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}

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QUdpSocket *udp = new QUdpSocket(this);
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udp->bind(QHostAddress::Any, 45454);
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connect(udp, &QUdpSocket::readyRead, this, [udp]() {
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    while (udp->hasPendingDatagrams()) {
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        QByteArray buf;
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        buf.resize(udp->pendingDatagramSize());
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        QHostAddress sender;
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        quint16 port;
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        udp->readDatagram(buf.data(), buf.size(), &sender, &port);
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    }
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});
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udp->writeDatagram("hello", QHostAddress("192.168.1.1"), 45454);

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QNetworkAccessManager *mgr = new QNetworkAccessManager(this);
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connect(mgr, &QNetworkAccessManager::finished,
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        this, &MainWindow::onReplyFinished);
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QNetworkRequest req(QUrl("https://api.example.com/data"));
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req.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
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mgr->get(req);
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// POST
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// mgr->post(req, QByteArray("{\"key\":\"value\"}"));

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void MainWindow::onReplyFinished(QNetworkReply *reply)
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{
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  if (reply->error() != QNetworkReply::NoError) {
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    qWarning() << reply->errorString();
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  } else {
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    QByteArray body = reply->readAll();
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  }
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  reply->deleteLater();
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}

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QSslSocket *ssl = new QSslSocket(this);
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connect(ssl, &QSslSocket::encrypted, this, &Client::onEncrypted);
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ssl->connectToHostEncrypted("example.com", 443);