websocket 是基于 TCP socket 之上的应用层， 解决 HTML 轮询连接的问题，实现客户端与服务端长连接， 实现消息互相发送，全双工。
- 服务端， 使用 QT 教程demo
chatserver.h
#ifndef CHATSERVER_H
#define CHATSERVER_H
#include <QtCore/QObject>
#include <QtCore/QList>
QT_FORWARD_DECLARE_CLASS(QWebSocketServer)
QT_FORWARD_DECLARE_CLASS(QWebSocket)
QT_FORWARD_DECLARE_CLASS(QString)
class ChatServer : public QObject
{
Q_OBJECT
public:
explicit ChatServer(quint16 port, QObject *parent = nullptr);
~ChatServer() override;
private slots:
void onNewConnection();
void processMessage(const QString &message);
void socketDisconnected();
private:
QWebSocketServer *m_pWebSocketServer;
QList<QWebSocket *> m_clients;
};
#endif //CHATSERVER_H
- chatserver.cpp
/****************************************************************************
**
** Copyright (C) 2016 Kurt Pattyn <pattyn.kurt@gmail.com>.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebSockets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "chatserver.h"
#include <QtWebSockets>
#include <QtCore>
#include <cstdio>
using namespace std;
QT_USE_NAMESPACE
static QString getIdentifier(QWebSocket *peer)
{
return QStringLiteral("%1:%2").arg(peer->peerAddress().toString(),
QString::number(peer->peerPort()));
}
//! [constructor]
ChatServer::ChatServer(quint16 port, QObject *parent) :
QObject(parent),
m_pWebSocketServer(new QWebSocketServer(QStringLiteral("Chat Server"),
QWebSocketServer::NonSecureMode,
this))
{
if (m_pWebSocketServer->listen(QHostAddress::Any, port))
{
QTextStream(stdout) << "Chat Server listening on port " << port << '\n';
connect(m_pWebSocketServer, &QWebSocketServer::newConnection,
this, &ChatServer::onNewConnection);
}
}
ChatServer::~ChatServer()
{
m_pWebSocketServer->close();
}
//! [constructor]
//! [onNewConnection]
void ChatServer::onNewConnection()
{
auto pSocket = m_pWebSocketServer->nextPendingConnection();
QTextStream(stdout) << getIdentifier(pSocket) << " connected!\n";
pSocket->setParent(this);
// 对连接进来的每一个进行信号槽连接绑定
connect(pSocket, &QWebSocket::textMessageReceived,
this, &ChatServer::processMessage);
connect(pSocket, &QWebSocket::disconnected,
this, &ChatServer::socketDisconnected);
// 使用 list 进行管理，方便断开
m_clients << pSocket;
}
//! [onNewConnection]
//! [processMessage]
void ChatServer::processMessage(const QString &message)
{
QWebSocket *pSender = qobject_cast<QWebSocket *>(sender());
for (QWebSocket *pClient : qAsConst(m_clients)) {
if (pClient == pSender) //don't echo message back to sender
{
pClient->sendTextMessage(message + " @ host echo ");
qDebug() << "peer address = " << pClient->peerAddress();
}
}
QTextStream(stdout) << "received msg: " << message << std::endl;
}
//! [processMessage]
//! [socketDisconnected]
void ChatServer::socketDisconnected()
{
QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
QTextStream(stdout) << getIdentifier(pClient) << " disconnected!\n";
if (pClient)
{
m_clients.removeAll(pClient);
pClient->deleteLater();
}
}
//! [socketDisconnected]
main.cpp
#include <QtCore/QCoreApplication>
#include "chatserver.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
ChatServer server(1234);
return a.exec();
}
- 客户端
clientwidget.h
#ifndef CLIENTWIDGET_H
#define CLIENTWIDGET_H
#include <QWidget>
#include "WebsocketClient.h"
QT_FORWARD_DECLARE_CLASS(QWebSocketClient)
QT_FORWARD_DECLARE_CLASS(QWebSocket)
namespace Ui {
class ClientWidget;
}
class ClientWidget : public QWidget
{
Q_OBJECT
public:
explicit ClientWidget(QWidget *parent = 0);
~ClientWidget();
private slots:
void on_pushButton_clicked();
void on_pushButton_2_clicked();
void slot_recvMsg(QString msg);
private:
Ui::ClientWidget *ui;
WebsocketClient m_client;
};
#endif // CLIENTWIDGET_H
clientwidget.cpp
#include "ClientWidget.h"
#include "ui_ClientWidgetwidget.h"
ClientWidget::ClientWidget(QWidget *parent) :
QWidget(parent),
ui(new Ui::ClientWidget)
{
ui->setupUi(this);
}
ClientWidget::~ClientWidget()
{
delete ui;
}
void ClientWidget::on_pushButton_clicked()
{
m_client.connectToServer();
connect(&m_client, &WebsocketClient::sig_newMsg, this, &ClientWidget::slot_recvMsg);
}
void ClientWidget::on_pushButton_2_clicked()
{
m_client.sendMsg(ui->lineEditSendTxt->text());
}
void ClientWidget::slot_recvMsg(QString msg)
{
ui->textBrowserRecv->append(msg);
}
websocketclient.h文章来源：https://www.toymoban.com/news/detail-613652.html
#ifndef WEBSOCKETCLIENT_H
#define WEBSOCKETCLIENT_H
#include <QDebug>
#include <QWebSocket>
QT_FORWARD_DECLARE_CLASS(QWebSocketClient)
QT_FORWARD_DECLARE_CLASS(QWebSocket)
class WebsocketClient:public QObject
{
Q_OBJECT
public:
WebsocketClient();
//connect to server
void connectToServer();
bool sendMsg(QString msg);
void disConnect();
public slots:
void slot_recvMsg(QString msg);
signals:
void sig_newMsg(QString msg);
private:
QWebSocket m_clientSocket;
};
#endif // WEBSOCKETCLIENT_H
websocketclient.cpp文章来源地址https://www.toymoban.com/news/detail-613652.html
#include "WebsocketClient.h"
WebsocketClient::WebsocketClient()
{
}
void WebsocketClient::connectToServer()
{
QString urlStr = "ws://127.0.0.1:1234";
m_clientSocket.open(QUrl(urlStr));
connect(&m_clientSocket, &QWebSocket::textMessageReceived, this, &WebsocketClient::slot_recvMsg);
}
bool WebsocketClient::sendMsg(QString msg)
{
if (m_clientSocket.sendTextMessage(msg)) {
return true;
}
else {
return false;
}
}
void WebsocketClient::disConnect()
{
m_clientSocket.close();
}
void WebsocketClient::slot_recvMsg(QString msg)
{
qDebug() << "client received from host: " << msg;
emit sig_newMsg(msg);
}
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