qt实现http通讯服务端-QT开发中文网

在Qt中实现HTTP服务端通讯，可以使用Qt提供的QTcpServer类和相关类来完成。具体步骤如下：

创建一个QTcpServer对象，并监听指定端口。

QTcpServer *server = new QTcpServer(this);
if (!server->listen(QHostAddress::Any, 8080)) {
    qDebug() << "Error: " << server->errorString();
}
else {
    connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
}

当有新的客户端连接时，会触发newConnection信号，可以在该槽函数中获取对应的QTcpSocket对象进行处理。

void Server::newConnection()
{
    while (server->hasPendingConnections()) {
        QTcpSocket *socket = server->nextPendingConnection();
        connect(socket, SIGNAL(readyRead()), this, SLOT(readClient()));
        connect(socket, SIGNAL(disconnected()), socket, SLOT(deleteLater()));
    }
}

当收到客户端发送的请求数据时，会触发readyRead信号。在该槽函数中可以获取请求数据并进行处理。

void Server::readClient()
{
    QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
    if (!socket)
        return;

    QByteArray requestData = socket->readAll();
    // 对请求数据进行处理

    QByteArray responseData = "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n<html><body>Hello World!</body></html>";
    socket->write(responseData);
}

完整代码示例：

#include <QtNetwork>
#include <QDebug>

class Server : public QObject
{
    Q_OBJECT

public:
    Server(QObject *parent = nullptr) : QObject(parent)
    {
        server = new QTcpServer(this);
        if (!server->listen(QHostAddress::Any, 8080)) {
            qDebug() << "Error: " << server->errorString();
        }
        else {
            connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));
        }
    }

private slots:
    void newConnection()
    {
        while (server->hasPendingConnections()) {
            QTcpSocket *socket = server->nextPendingConnection();
            connect(socket, SIGNAL(readyRead()), this, SLOT(readClient()));
            connect(socket, SIGNAL(disconnected()), socket, SLOT(deleteLater()));
        }
    }

    void readClient()
    {
        QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
        if (!socket)
            return;

        QByteArray requestData = socket->readAll();
        // 对请求数据进行处理

        QByteArray responseData = "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n<html><body>Hello World!</body></html>";
        socket->write(responseData);
    }

private:
    QTcpServer *server;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    Server server;
    return app.exec();
}

#include "main.moc"