（二） 用QWebSocket 实现服务端和客户端（详细代码直接使用）

目录

前言

一、服务器的代码：

1、服务器的思路

2、具体服务器的代码示例

二、客户端的代码：

1、客户端的思路（和服务器类似）

2、具体客户端的代码示例

前言

        要是想了解QWebSocket的详细知识，还得移步到上一篇文章：

WebSocket 详解，以及用QWebSocket 实现服务端和客户端（含代码例子）-CSDN博客

        本篇文章主要讲解如何利用QWebSocket 实现服务和客户之间的通讯

一、服务器的代码：

1、服务器的思路

（1）首先创建了一个服务器的基类，主要实现了服务类的基本接口：

1、创建服务器：new QWebSocketServer
2、监听：listen
m_pWebSocketServer->listen(QHostAddress::LocalHost, mPort);//端口号
3、有新的连接，收到这个信号：QWebSocketServer::newConnection
4、获得新的客户端：nextPendingConnection 
5、接收到信息时候，收到信号：QWebSocket::binaryMessageReceived 
6、断开连接，收到信号：QWebSocket::disconnected

注意：数据的接收和发送，有两种格式，二进制和文本的，具体按照实际需要的来选择；

（2）在服务器的基类上，封装一个具体使用的类，这个类，主要是添加了QThread，创建一个子线程来进行服务器的开启，监听和接收数据，不会影响主线程的事件。

2、具体服务器的代码示例

        接收和发送的数据，以二进制为例

（1）服务器基类：

服务器基类的头文件：

        1）开启一个端口号为“9000”的服务器

        2）监听的网路是：QHostAddress::Any

QHostAddress::Any表示服务端监听所有可用的网络接口。
它是一个特殊的IP地址，表示服务端可以接受来自任何IP地址的连接请求。
这通常用于在一个计算机上运行多个网络服务时，让服务端能够监听所有可用的网络接口，

以便接受来自不同网络接口的连接请求。

注意：也可以监听具体的IP地址：

例如：QHostAddress(strLocalHostIp)

#ifndef WEBSOCKETSERVERBASE_H
#define WEBSOCKETSERVERBASE_H

#include <QObject>
#include <QtWebSockets>

QT_FORWARD_DECLARE_CLASS(QWebSocketServer)
QT_FORWARD_DECLARE_CLASS(QWebSocket)
QT_FORWARD_DECLARE_CLASS(QString)

class WebsocketServerBase : public QObject
{
    Q_OBJECT
public:
    explicit WebsocketServerBase(QString serverName,  quint16 port, QObject *parent = 0);
    virtual ~WebsocketServerBase();

signals:
    //客户端发来的数据
    void sigProcessServerMessage(const QByteArray &data);

public slots:
    //发送数据给客户端
    void slotSendToAllClients(const QByteArray &data);

    //启动websocket服务器
    void slotStartServer();

private slots:
    //处理新接入的连接
    void slotNewConnection();

    //处理链接断开的事件
    void slotSocketDisconnected();

    //接收数据，并转发
    void slotProcessBinaryMessage(const QByteArray &message);

public:
    //检测是否存在客户端
    bool hadClients();

private:
    QWebSocketServer *m_pWebSocketServer = nullptr;
    QList<QWebSocket *> m_clients;

    unsigned short m_nPort = 9000;
    QString m_strServerName = "server";
};

#endif // WEBSOCKETSERVERBASE_H

服务器基类的源文件：

#include "websocketserverbase.h"

#include<QDebug>

static QString getIdentifier(QWebSocket *peer)
{
    return QStringLiteral("%1:%2").arg(peer->peerAddress().toString(),
                                       peer->origin());
}

WebsocketServerBase::WebsocketServerBase(QString serverName,  quint16 port, QObject *parent)
    : QObject(parent)
    ,m_nPort(port)
    ,m_strServerName(serverName)
{
}

WebsocketServerBase::~WebsocketServerBase()
{   
    if(m_pWebSocketServer)
    {
        m_pWebSocketServer->close();
        //m_pWebSocketServer->abort();
        m_pWebSocketServer->deleteLater();
    }
}

//接收到外部发来的信息，转发给客户端
void WebsocketServerBase::slotSendToAllClients(const QByteArray &data)
{
    qDebug() << __FUNCTION__;

    for (QWebSocket *pClient : qAsConst(m_clients)) {
        qDebug() << "data: " << data;
         pClient->sendBinaryMessage(data);
    }
}

bool WebsocketServerBase::hadClients()
{
    return m_clients.size()>0;
}

void WebsocketServerBase::slotStartServer()
{
    if(m_pWebSocketServer)
        return;

    m_pWebSocketServer = new QWebSocketServer(m_strServerName, QWebSocketServer::NonSecureMode, this);

    if (m_pWebSocketServer->listen(QHostAddress::Any, m_nPort))
    {
        connect(m_pWebSocketServer, &QWebSocketServer::newConnection, this, &WebsocketServerBase::slotNewConnection);
        qDebug() << "WebSocket is start, port:" << m_nPort;
    }
}

void WebsocketServerBase::slotNewConnection()
{
    auto pSocket = m_pWebSocketServer->nextPendingConnection();
    QTextStream(stdout) << getIdentifier(pSocket) << " connected!\n";

    qDebug() << "client connected!";

    pSocket->setParent(this);

	//二进制数据的接收
    connect(pSocket, &QWebSocket::binaryMessageReceived, this, &WebsocketServerBase::slotProcessBinaryMessage);
    connect(pSocket, &QWebSocket::disconnected, this, &WebsocketServerBase::slotSocketDisconnected);

    m_clients << pSocket;
}

void WebsocketServerBase::slotSocketDisconnected()
{
	QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
	QTextStream(stdout) << getIdentifier(pClient) << " disconnected!\n";
	if (pClient)
	{
		m_clients.removeAll(pClient);
		pClient->deleteLater();
	}
}

//接收客户端发来的数据，并转发出去
void WebsocketServerBase::slotProcessBinaryMessage(const QByteArray &data)
{
    qDebug() << __FUNCTION__ << " data:" << data;
    emit sigProcessServerMessage(data);

    //test
    //slotSendToAllClients(data);
}

（2）将服务器基类封装，改造下：（外面可以直接使用这个类进行通讯）

改造后服务器的头文件：

        此处本例是使用回调函数将结果抛给上一层调用者，在qt里，完全可以用信号槽代替的。

#ifndef READERWEBSOCKETSERVER_H
#define READERWEBSOCKETSERVER_H

#include <QObject>
#include "Singleton.h"


// 回调函数，将websocket的结果抛给上层
typedef void(*recvMsgToSerial)(const QByteArray &byteArray);

class WebsocketServerBase;
class ReaderWebsocketServer : public QObject, public Singleton<ReaderWebsocketServer>
{
    Q_OBJECT
    friend class Singleton<ReaderWebsocketServer>;

public:
    explicit ReaderWebsocketServer(QObject *parent = 0);
    virtual ~ReaderWebsocketServer();

public:
    // 设置回调函数
    void setCallBack(recvMsgToSerial pFunc, void* pUser = NULL);

    // 接收串口发来数据，转发给客户端
    bool sendData(const QByteArray &byteArray);

signals:
	//转发数据给客户端
    void sigSendToAllClients(const QByteArray &data);

private slots:
    //处理客户端发来的数据，转发给需要的地方
    void slotProcessServerMessage(const QByteArray &data);

private:
    WebsocketServerBase* m_pWsServer = nullptr;
    QThread* m_thdWsServer = nullptr;

    void* m_pUser;							// 返回回调的对象
    recvMsgToSerial m_pRecvMsgToSerial;		// 回调
};

#endif // READERWEBSOCKETSERVER_H

改造后服务器的源文件：

#include "readerwebsocketserver.h"

#include <QThread>
#include <cstring>
#include "websocketserverbase.h"

ReaderWebsocketServer::ReaderWebsocketServer(QObject *parent)
    : QObject(parent)
{
    m_thdWsServer = new QThread();
    m_pWsServer = new WebsocketServerBase("reader", 9000);
    m_pWsServer->moveToThread(m_thdWsServer);

    connect(m_pWsServer, &WebsocketServerBase::sigProcessServerMessage, this, &ReaderWebsocketServer::slotProcessServerMessage);
    connect(this, &ReaderWebsocketServer::sigSendToAllClients, m_pWsServer, &WebsocketServerBase::slotSendToAllClients);

    connect(m_thdWsServer, &QThread::started, m_pWsServer, &WebsocketServerBase::slotStartServer);
    connect(m_thdWsServer, &QThread::finished, m_pWsServer, &WebsocketServerBase::deleteLater);
    connect(m_thdWsServer, &QThread::finished, m_thdWsServer, &WebsocketServerBase::deleteLater);
    m_thdWsServer->start();
}

ReaderWebsocketServer::~ReaderWebsocketServer()
{
    if(m_thdWsServer)
    {
        m_thdWsServer->quit();
        m_thdWsServer->wait();
    }

    if(m_pWsServer)
    {
        m_pWsServer->deleteLater();
    }
}

void ReaderWebsocketServer::setCallBack(recvMsgToSerial pFunc, void *pUser)
{
    if (nullptr != pFunc)
        m_pRecvMsgToSerial = pFunc;

    if (nullptr != pUser)
        m_pUser = pUser;
}

//接收串口发来数据，转发给客户端
bool ReaderWebsocketServer::sendData(const QByteArray &byteArray)
{
    bool hadBnode = m_pWsServer->hadClients();
    if (hadBnode)
    {
        emit sigSendToAllClients(byteArray);
    }
}

//处理客户端发来的数据，转发给需要的地方
void ReaderWebsocketServer::slotProcessServerMessage(const QByteArray &byteArray)
{
    qDebug() << __FUNCTION__ ;
    m_pRecvMsgToSerial(byteArray);
}

二、客户端的代码：

1、客户端的思路（和服务器类似）

（1）首先创建了一个客户端的基类，主要实现了客户端的基本接口：

（2）在客户端基类上，封装一个具体使用的类：（外面可以直接使用这个类进行通讯）

        这个类，主要是添加了QThread 和QTimer，QThread 创建一个子线程来进行服务器的开启，监听和接收数据，不会影响主线程的事件；QTimer主要是发心跳包，实现断开重连机制；

2、具体客户端的代码示例

        接收和发送的数据，以二进制为例

（1）客户端基类：

客户端基类的头文件：

/*
 * @Description: websocket客户端，用于与中间件通信
 */

#pragma once
#include <QObject>
#include <QByteArray>

class QTimer;
class QWebSocket;
class WebSocketBase : public QObject
{
    Q_OBJECT
public:
    WebSocketBase(QObject *parent = nullptr);
    ~WebSocketBase();

    void setWebSocketUrl(QString strUrl="");
    bool getConnectStatus();
    int RecvFrom(QByteArray& byteArray);

signals:
    void sigClientBinaryMessageReceived(const QByteArray &byteArray); //借用websocket的信号函数

public slots:
    void slotCreateDataRecWS();//创建websocket连接
    void slotSendBinaryMessageMessage(const QByteArray &byteArray);
    void slotReconnect();           /*-<周期重连函数 */
    void slotActiveReconnect();

private slots:
    void slotOnConnected();                 /*-<socket建立成功后，触发该函数 */
    void slotOnBinaryMessageReceived(const QByteArray &byteArray);   /*-<收到Sev端的数据时，触发该函数 */
    void slotOnDisConnected();              /*-<socket连接断开后，触发该函数 */

private:
    QWebSocket *m_pDataRecvWS;     /*-<websocket类 */
    QTimer *m_pTimer;            /*-<周期重连Timer */
    QString m_strURL;              /*连接URL*/
    bool m_bConnectStatus;         /*-<websocket连接状态，连接成功：true；断开：false */
    QByteArray m_byteArray;
};

客户端基类的源文件：

#include "WebSocketBase.h"
#include <QWebSocket>
#include <QTimer>
#include <QByteArray>
#include <cstring>

WebSocketBase::WebSocketBase(QObject *parent) : QObject(parent)
  ,m_pDataRecvWS(nullptr)
  ,m_pTimer(nullptr)
  ,m_strURL("")
  ,m_bConnectStatus(false)
  ,m_byteArray("")
{

}

WebSocketBase::~WebSocketBase()
{
    m_pTimer->stop();
    m_pTimer->deleteLater();
    m_pDataRecvWS->abort();
    m_pDataRecvWS->deleteLater();
}

void WebSocketBase::setWebSocketUrl(QString strUrl)
{
    m_strURL = strUrl;
    if(m_strURL.isEmpty())
    {
        m_strURL = "127.0.0.1";
    }
}

bool WebSocketBase::getConnectStatus()
{
    return m_bConnectStatus;
}

int WebSocketBase::RecvFrom(QByteArray &byteArray)
{
    byteArray = m_byteArray;
    m_byteArray.clear();
    return byteArray.size();
}

void WebSocketBase::slotCreateDataRecWS()
{
    if(nullptr == m_pTimer)
    {
        m_pTimer = new QTimer();
    }

    qDebug() << "Server Address" << m_strURL;

    if(m_pDataRecvWS == nullptr)
    {
        m_pDataRecvWS = new QWebSocket();
        connect(m_pDataRecvWS, &QWebSocket::disconnected, this, &WebSocketBase::slotOnDisConnected);
        connect(m_pDataRecvWS, &QWebSocket::binaryMessageReceived, this, &WebSocketBase::slotOnBinaryMessageReceived);
        connect(m_pDataRecvWS, &QWebSocket::connected, this, &WebSocketBase::slotOnConnected);
        connect(m_pTimer, &QTimer::timeout, this, &WebSocketBase::slotReconnect);
        m_pDataRecvWS->open(QUrl(m_strURL));
    }
}

void WebSocketBase::slotSendBinaryMessageMessage(const QByteArray &message)
{
    if (m_pDataRecvWS)
        m_pDataRecvWS->sendBinaryMessage(message);
}

void WebSocketBase::slotActiveReconnect()
{
    qDebug("try to Active Reconnect!!!");
    if(m_pDataRecvWS != nullptr)
    {
        m_bConnectStatus = false;
        m_pDataRecvWS->abort();
        qDebug("Exec Active Reconnect!");
        m_pDataRecvWS->open(QUrl(m_strURL));
    }

    return;
}

void WebSocketBase::slotReconnect()
{
    qDebug() << "try to reconnect:" << m_strURL;

    m_pDataRecvWS->abort();
    m_pDataRecvWS->open(QUrl(m_strURL));
}

void WebSocketBase::slotOnConnected()
{
    qDebug("WebSocketBase websocket is already connect!");

    m_bConnectStatus = true;
    m_pTimer->stop();
    qDebug() << "Address:" << m_strURL;
}

void WebSocketBase::slotOnDisConnected()
{
    qDebug() << "Address is disconnected:" << m_strURL;

    m_bConnectStatus = false;
    m_pTimer->start(3000);/*-<当连接失败时，触发重连计时器，设置计数周期为3秒 */
}

void WebSocketBase::slotOnBinaryMessageReceived(const QByteArray& byteArray)
{
    m_byteArray = byteArray;
}

（2）将客户端基类封装，改造下：（外面可以直接使用这个类进行通讯）

改造后客户端头文件：

/*
 * @Description: websocket客户端，用于与中间件通信
 */
#pragma once

#include <QObject>
#include <QCoreApplication>

#include "Singleton.h"

class WebSocketBase;
class QTimer;

class WsReaderClient : public QObject, public Singleton<WsReaderClient>
{
    Q_OBJECT
    friend class Singleton<WsReaderClient>;

public:
    WsReaderClient(QObject *parent = nullptr);
    ~WsReaderClient();

public:
    void SendTo(const QByteArray &byteArray);
    int RecvFrom(QByteArray& byteArray);

    bool getConnectStatus();

signals:
    //转发数据给server
    void sigSendToServer(const QByteArray &byteArray);

public slots:
    //接收服务器数据
    void slotRecvServerData(const QByteArray &byteArray);

    //发送服务器心跳包
    void slotHeartBeatToServer();

private:
    void readConfig();

private:
    WebSocketBase* m_wsReaderClient;
    QThread* m_thdReaderClient;
    QTimer *m_pTimerReader;
    int m_nHeartBeatTimeOutReader;
    QString m_URL = "";
};

改造后客户端源文件：文章来源地址https://www.toymoban.com/news/detail-807807.html

#include "WsReaderClient.h"

#include <QWebSocket>
#include <QTimer>
#include <QThread>
#include <QByteArray>
#include <cstring>
#include <QSettings>

#include "WebSocketBase.h"

WsReaderClient::WsReaderClient(QObject *parent)
    : QObject(parent)
{
    readConfig();

    m_thdReaderClient = new QThread();
    m_wsReaderClient = new WebSocketBase();
    m_wsReaderClient->setWebSocketUrl(m_URL);

    m_wsReaderClient->moveToThread(m_thdReaderClient);
    connect(m_thdReaderClient, &QThread::started, m_wsReaderClient, &WebSocketBase::slotCreateDataRecWS);
    connect(this, &WsReaderClient::sigSendToServer, m_wsReaderClient, &WebSocketBase::slotSendBinaryMessageMessage);
    //connect(this, &WsReaderClient::sigReconnectServer, m_wsReaderClient, &WebSocketBase::slotActiveReconnect);

    connect(m_thdReaderClient, &QThread::finished, m_wsReaderClient, &WebSocketBase::deleteLater);
    connect(m_thdReaderClient, &QThread::finished, m_thdReaderClient, &QThread::deleteLater);
    m_thdReaderClient->start();

    m_pTimerReader = new QTimer(this);
    connect(m_pTimerReader, &QTimer::timeout, this, &WsReaderClient::slotHeartBeatToServer);
    //m_nHeartBeatTimeOutKeyBoard = 0;
    m_pTimerReader->start(10*1000);
}

WsReaderClient::~WsReaderClient()
{
    m_pTimerReader->stop();
    m_pTimerReader->deleteLater();

    if(m_wsReaderClient)
    {
       delete m_wsReaderClient;
        m_wsReaderClient = nullptr;
    }

    if(m_pTimerReader)
    {
        delete m_pTimerReader;
        m_pTimerReader = nullptr;
    }
}

void WsReaderClient::slotHeartBeatToServer()
{
    //todo
}

void WsReaderClient::readConfig()
{
    // "/mnt/hgfs/SharedFiles/shanxi/Reader/linux_readerTest/bin/libReaderApi.so";
    QString appPath = QCoreApplication::applicationDirPath();
    qDebug() << "appPath=" << appPath;

    QString path = appPath + "/ReaderConfig.ini";
    QSettings settings(path, QSettings::IniFormat);
    m_URL = settings.value("Communication/ipAddr").toString();
    qDebug() << "m_URL=" << m_URL;
}

void WsReaderClient::SendTo(const QByteArray &data)
{
    emit sigSendToServer(data);
}

int WsReaderClient::RecvFrom(QByteArray &byteArray)
{
    return m_wsReaderClient->RecvFrom(byteArray);
}

bool WsReaderClient::getConnectStatus()
{
    return m_wsReaderClient->getConnectStatus();
}

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