Qt開源作品37-網絡中轉服務器

一、前言

用Qt做開發10年了，其中做過好多項目，基於現在web和移動互聯網發展如此迅猛，大量的應用場景需要一個網絡中轉服務器，可以實現手機app或者其他客戶端遠程回控設備，現在物聯網發展非常迅猛，這個將來也是大勢所趨，所以有這個想法很久了，打算用Qt也來做個簡單的網絡中轉服務器。

需求場景：

1. 手機端或者其他端可以對設備進行回控，並查看設備各種運行狀態，接收報警推送等。
2. 同時支持在局域網、廣域網、互聯網訪問，尤其是互聯網訪問。
3. 權限控制，給定賬號控制授權的設備，並自動拉取設備信息。
4. 設備不在線要給出反饋信息提示以便分析。
5. 每個連接都有自己的唯一編號作為標識符。
6. 可以方便的拓展為微信接入+小程序接入+web接入。

二、代碼思路

#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;
    }

    //取出唯一標識符,並過濾,可自行更改過濾條件
    QByteArray cmd = data.mid(App::CmdStart1, App::CmdLen1);
    QString id = QString(cmd);
    if (id.startsWith("S") && deviceID != id) {
        deviceID = id;
        //發送信號更新標識符
        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)
#else
void 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, "客戶端上線");

    //追加到鏈表中
    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, "客戶端下線");

    //斷開連接后從鏈表中移除
    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、效果圖

四、開源主頁

以上作品完整源碼下載都在開源主頁，會持續不斷更新作品數量和質量，歡迎各位關注。

1. 國內站點：https://gitee.com/feiyangqingyun/QWidgetDemo
2. 國際站點：https://github.com/feiyangqingyun/QWidgetDemo
3. 個人主頁：https://blog.csdn.net/feiyangqingyun
4. 知乎主頁：https://www.zhihu.com/people/feiyangqingyun/