Qt网络中转服务器怎么实现

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一、前言

需求场景：

1. 手机端或者其他端可以对设备进行回控，并查看设备各种运行状态，接收报警推送等。

2. 同时支持在局域网、广域网、互联网访问，尤其是互联网访问。

3. 权限控制，给定账号控制授权的设备，并自动拉取设备信息。

4. 设备不在线要给出反馈信息提示以便分析。

5. 每个连接都有自己的唯一编号作为标识符。

6. 可以方便的拓展为微信接入+小程序接入+web接入。

二、代码思路

#include "tcpserver1.h"#include "quiwidget.h"TcpClient1::TcpClient1(QObject *parent) :  QTcpSocket(parent){    ip = "127.0.0.1";    port = 6907;    deviceID = "SSJC00000001";    connect(this, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(deleteLater()));    connect(this, SIGNAL(disconnected()), this, SLOT(deleteLater()));    connect(this, SIGNAL(readyRead()), this, SLOT(readData()));}void TcpClient1::setIP(const QString &ip){    this->ip = ip;}QString TcpClient1::getIP() const{    return this->ip;}void TcpClient1::setPort(int port){    this->port = port;}int TcpClient1::getPort() const{    return this->port;}QString TcpClient1::getDeviceID(){    return this->deviceID;}void TcpClient1::readData(){    QByteArray data = this->readAll();    if (data.length() <= 0) {        return;    }    //取出唯一标识符,并过滤,可自行更改过滤条件    QByteArray cmd = data.mid(App::CmdStart1, App::CmdLen1);    QString id = QString(cmd);    if (id.startsWith("S") && deviceID != id) {        deviceID = id;        //发送信号更新标识符        emit receiveDeviceID(ip, port, deviceID);    }    QString buffer;    if (App::HexData1) {        buffer = QUIHelper::byteArrayToHexStr(data);    } else {        buffer = QString(data);    }    emit receiveData(ip, port, deviceID, buffer);}void TcpClient1::sendData(const QString &data){    QByteArray buffer;    if (App::HexData1) {        buffer = QUIHelper::hexStrToByteArray(data);    } else {        buffer = data.toLatin1();    }    this->write(buffer);    emit sendData(ip, port, deviceID, data);}TcpServer1::TcpServer1(QObject *parent) : QTcpServer(parent){}#if (QT_VERSION > QT_VERSION_CHECK(5,0,0))void TcpServer1::incomingConnection(qintptr handle)#elsevoid TcpServer1::incomingConnection(int handle)#endif{    TcpClient1 *client = new TcpClient1(this);    client->setSocketDescriptor(handle);    connect(client, SIGNAL(disconnected()), this, SLOT(disconnected()));    connect(client, SIGNAL(sendData(QString, int, QString, QString)), this, SIGNAL(sendData(QString, int, QString, QString)));    connect(client, SIGNAL(receiveData(QString, int, QString, QString)), this, SIGNAL(receiveData(QString, int, QString, QString)));    connect(client, SIGNAL(receiveDeviceID(QString, int, QString)), this, SIGNAL(receiveDeviceID(QString, int, QString)));    QString ip = client->peerAddress().toString();    int port = client->peerPort();    QString deviceID = client->getDeviceID();    client->setIP(ip);    client->setPort(port);    emit clientConnected(ip, port, deviceID);    emit sendData(ip, port, deviceID, "客户端上线");    //追加到链表中    clients.append(client);}void TcpServer1::disconnected(){    TcpClient1 *client = (TcpClient1 *)sender();    QString ip = client->getIP();    int port = client->getPort();    QString deviceID = client->getDeviceID();    emit clientDisconnected(ip, port, deviceID);    emit sendData(ip, port, deviceID, "客户端下线");    //断开连接后从链表中移除    clients.removeOne(client);}bool TcpServer1::start(){#if (QT_VERSION > QT_VERSION_CHECK(5,0,0))    bool ok = listen(QHostAddress::AnyIPv4, App::ListenPort1);#else    bool ok = listen(QHostAddress::Any, App::ListenPort1);#endif    return ok;}void TcpServer1::stop(){    foreach (TcpClient1 *client, clients) {        client->disconnectFromHost();    }    this->close();}bool TcpServer1::writeData(const QString &deviceID, const QString &data){    bool ok = false;    foreach (TcpClient1 *client, clients) {        if (client->getDeviceID() == deviceID) {            client->sendData(data);                        ok = true;                    }    }       return ok;}

三、效果图

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