QT之TCP通信程序

使用网络编程，要在项目文件中添加 QT+=network；

一、服务器程序

#include "serverwidget.h"
#include "ui_serverwidget.h"


ServerWidget::ServerWidget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::ServerWidget)
{
    ui->setupUi(this);
    tcpsocket=nullptr;
    tcpserver=nullptr;
    setWindowTitle("服务器");
    tcpserver = new QTcpServer(this);//分配空间，指定父对象，自动回收空间
    tcpserver->listen(QHostAddress::Any,8888);//监听所有地址的8888端口
    connect(tcpserver,&QTcpServer::newConnection,            //新连接信号
            [=]
            {
                tcpsocket = tcpserver->nextPendingConnection();//取出tcpserver套接字的下一个链接套接字，也就是tcpsocket

                QString ip = tcpsocket->peerAddress().toString();  //获取客户端IP
                quint16 port = tcpsocket->peerPort();             //获取客户端端口
                QString ipAndPortMessage = QString("[%1:%2]--成功链接").arg(ip).arg(port);
                ui->messageEdit->setText(ipAndPortMessage);    //在UI上显示成功链接


                connect(tcpsocket,&QTcpSocket::readyRead,          //连接准备读信号
                        [=]
                        {
                            QByteArray array = tcpsocket->readAll();//读所有信息，保存在数组中
                            ui->messageEdit->append(array);          //接收到的信息显示在UI上
                        }

                        );
                connect(tcpsocket,&QTcpSocket::disconnected,      //连接断开信号
                        [=]
                        {
                            ui->messageEdit->setText("客户端"+ip+":"+QString::number(port,10)+"断开");//UI上显示已断开
                        }

                        );
            }
            );


}


ServerWidget::~ServerWidget()
{
    delete ui;
}



void ServerWidget::on_sendButton_clicked()//发送按钮
{
    if(tcpsocket==nullptr)
    {
        return;
    }
    QString senMessage;
    senMessage = ui->sendEdit->toPlainText();


    tcpsocket->write(senMessage.toUtf8().data());//发送数据
}


void ServerWidget::on_closeButton_clicked()//断开连接按钮
{
    if(tcpsocket==nullptr)
    {
        return;
    }
    tcpsocket->disconnectFromHost();//断开链接
    tcpsocket->close();
    tcpsocket=nullptr;
}

二、客户端程序

#include "clianwidget.h"
#include "ui_clianwidget.h"
#include <QHostAddress>
ClianWidget::ClianWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ClianWidget)
{
    ui->setupUi(this);
    setWindowTitle("客户端");
    tcpSocket = new QTcpSocket(this);

    connect(tcpSocket,&QTcpSocket::connected,
            [=]
            {
                ui->messageBrowser->setText("已连接");
            }


            );
    connect(tcpSocket,&QTcpSocket::readyRead,
            [=]
            {
                QByteArray array = tcpSocket->readAll();
                ui->messageBrowser->append(array);
            }


            );
    connect(tcpSocket,&QTcpSocket::disconnected,
            [=]
            {
                ui->messageBrowser->setText("与服务器断开");
            }

            );
}


ClianWidget::~ClianWidget()
{
    delete ui;
}


void ClianWidget::on_connectButton_clicked()//连接服务器按钮
{
    QString ip = ui->ipEdit->text();
    quint16 port = static_cast<quint16>( ui->portEdit->text().toUInt());
    tcpSocket->connectToHost(QHostAddress(ip),port);//连接服务器
}


void ClianWidget::on_sendButton_clicked()//发送按钮
{
    if(tcpSocket==nullptr)
    {
        return;
    }
    QString senMessage;
    senMessage = ui->sendBrowser->toPlainText();


    tcpSocket->write(senMessage.toUtf8().data());//发送数据
}


void ClianWidget::on_closeButton_clicked()//断开连接按钮
{
    if(tcpSocket==nullptr)
    {
        return;
    }
    tcpSocket->disconnectFromHost();//断开链接
    tcpSocket->close();
   // tcpSocket=nullptr;
}