qt 服务器和客户端

先上效果图

1. 图中样式我采用了qss 总体设计, 然后对每个按钮进行单个设计

2. 使用 "控件提升", 为列表添加删除功能

2. 客户端可以监视多个客户端, 可以群发和单发

3. 输入框使用 "eventFilter" , 来使用 "回车" 发送消息

一、 服务器端

1. 在 .pro 文件中添加   QT += core gui   network

2. 定义:   

private:
    Ui::MainWindow *ui;
    QTcpSocket * tcpClientSocket;  // 客户端套接字
    QTcpServer * tcpServer;  // 服务器端对象
    QList<QTcpSocket *> clientList;  // 用户连接表
           

3 . new 出tcpServer . 添加信号和槽: connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnectClient())); 

tcpServer = new QTcpServer(this);
 ui->server_ip->setText(get_localmachine_ip());    // 获取本机的IP地址
 ui->port_lineEdit->setText(tr("666"));

 connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnectClient()));   // 新建连接
           

 4. newConnectClient函数用来保存新的连接,  并添加"读"和"断开" 的处理函数

void MainWindow::newConnectClient()
{
    tcpClientSocket = tcpServer->nextPendingConnection();  //获取网络套接字
    clientList.append(tcpClientSocket);  // 保存连接的Socket

    QString strIP =tr("%1 : %2").arg(tcpClientSocket->peerAddress().toString().split("::ffff:")[1]).arg(
                tcpClientSocket->peerPort());  // 拼接字符串
    ui->connect_listWidget->addItem(strIP);
    ui->IP_comboBox->addItem(strIP);

    connect(tcpClientSocket,SIGNAL(readyRead()),this,SLOT(readData()));     // 读取客户端发送的信息
    connect(tcpClientSocket,SIGNAL(error(QAbstractSocket::SocketError)),\
            this,SLOT(readError(QAbstractSocket::SocetError)));

    connect(tcpClientSocket,SIGNAL(disconnected()),this,SLOT(disconnectedSlot()));   // 断开连接

}
           

5. 点击监听按钮,开始监听客户端的请求:    

try {
             bool ok = tcpServer->listen(QHostAddress::Any,ui->port_lineEdit->text().toInt());
             if(ok)
             {
                 ui->statusBar->showMessage("开始监听");
                 ui->connect_Button->setText("断开");
                 ui->connect_Button->setStyleSheet("QPushButton{background-color: rgb(124, 200, 78);color:red;}"
                                                   "QPushButton:pressed{background-color:rgb(85, 170, 255); color:red;}");
             }

} catch(QAbstractSocket::SocketError e){
      readError(e);
}
           

6. 读取数据使用       

void MainWindow::readData()
{
    foreach(QTcpSocket *socket, clientList){
        QByteArray data = socket->readAll();
        if(!data.isEmpty())
        {           
             ui->show_textEdit->append(QString(data));
        }
    }
}
           

7. 发送数据 

// 发送
void MainWindow::on_send_button_clicked()
{
    QString data = ui->send_textEdit->toPlainText();
    if (!data.isEmpty())
    {
        if (!ui->IP_comboBox->currentText().isEmpty())
        {
//           qDebug() <<ui->IP_comboBox->currentText();
//           qDebug() << ui->IP_comboBox->itemText(0);
//           qDebug() << ui->IP_comboBox->currentIndex();
             QString clientIP = ui->IP_comboBox->currentText().split(":")[0].trimmed();
             int clientPort = ui->IP_comboBox->currentText().split(":")         
                              [1].trimmed().toInt();                                               
//               qDebug() << "ip " <<clientIP;
//               qDebug() << clientPort;
               foreach(QTcpSocket *socket,clientList)
               {
                   if(socket->isValid())
                   {
                       if (socket->peerAddress().toString().split("::ffff:")[1] == clientIP &&
                               socket->peerPort() == clientPort)
                       {
                           int sendRe = socket->write(data.toUtf8().data());
                           ui->send_textEdit->clear();
                       }
                   }
               }    
         }
     }
}
           

二、客户端:

1. 定义socket

private:
    Ui::MainWindow *ui;
    QTcpSocket *clientSocket;
           

2. 设置要连接的服务器IP和端口

this->setWindowTitle(tr("客户端"));
    this->setFixedSize(750,600);
    ui->statusBar->showMessage(tr("未连接服务器"));
    ui->server_ip->setText("192.168.1.3");
    ui->port_lineEdit->setText("666");
           

3. 连接服务器， 注意ip地址需要用 “QHostAddress” 进行转换， 直接用ip无法连接 ， 连接成功添加 “读” 和“删除” 信号

if (ui->connect_Button->text() == "连接")
    {
        this->clientSocket = new QTcpSocket(this);
        QString ip = ui->server_ip->text().trimmed();
        QHostAddress * addtress = new QHostAddress;
        addtress->setAddress(ip);
        short port = ui->port_lineEdit->text().toShort();
        this->clientSocket->connectToHost(*addtress,port);

        connect(clientSocket,SIGNAL(readyRead()),this,SLOT(readyReadSlot()));
        connect(clientSocket,SIGNAL(disconnected()),this,SLOT(disconnectedSlots()));
}
           

4. 读取和发送和服务器一样

 源码地址: https://download.csdn.net/download/chen1231985111/10872106