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Qt实现TCP客户端和服务器通讯程序

复习的心态过一遍之前基础的一些东西，Qt封装了QTcpServer和QTcpSocket两个类，其中QTcpServer继承自QObject，通过listen()函数监听传入的客户端连接，当Client连接上时，QTcpServer会发出newConnection的信号，在对应的槽函数中使用nextPendingConnection()拿到连接的客户端的句柄和信息。
而QTcpSocket则是读写数据的时候使用，过程很简单。
服务器流程：listen->newConnection->nextPendingConnection->readAll/write
客户端流程：connectToHost->waitForConnected->write/readAll
需要注意的是在使用网络相关的类前，需要在pro文件加上QT += network
通信时：
Qt实现TCP客户端和服务器通讯程序
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客户端掉线时：
Qt实现TCP客户端和服务器通讯程序
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QTcpServer服务器代码（包含.h和.cpp）:
.h

#ifndef WIDGET_H#define WIDGET_H #include #include #include QT_BEGIN_NAMESPACEnamespace Ui { class Widget; }QT_END_NAMESPACE class Widget : public QWidget{Q_OBJECT public:Widget(QWidget *parent = nullptr); ~Widget(); protected slots:void onSendBtnClicked(); void onNewClientConnected(); void onRecvData(); void onClientDisconnected(); private:void Init(); private:Ui::Widget *ui; private:QTcpServer *_tcpServer; QTcpSocket *_tcpSocket; }; #endif // WIDGET_H

.cpp
#include "widget.h"#include "ui_widget.h"#include #include #define MyTcpPort 8886 Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget),_tcpServer(nullptr),_tcpSocket(nullptr){ui->setupUi(this); connect(this->ui->btn_send,&QPushButton::clicked,this,&Widget::onSendBtnClicked); Init(); setWindowTitle("服务端"); } Widget::~Widget(){delete ui; if(_tcpSocket){_tcpSocket->disconnect(); _tcpSocket->abort(); _tcpSocket->close(); _tcpSocket->deleteLater(); }if(_tcpServer){_tcpServer->close(); delete _tcpServer; }} void Widget::Init(){_tcpSocket = new QTcpSocket; _tcpServer = new QTcpServer; int ret = _tcpServer->listen(QHostAddress::AnyIPv4,MyTcpPort); if(ret==0){qDebug()<<"_tcpServer->listen is failied"; return; }connect(_tcpServer,&QTcpServer::newConnection,this,&Widget::onNewClientConnected); } void Widget::onSendBtnClicked(){if(!_tcpSocket) return; QString inputText = ui->inputEdit->text(); if(inputText.isEmpty())return; //发送数据int ret = _tcpSocket->write(inputText.toStdString().c_str()); if(ret<0){qDebug()<<"write to client is failed!"; }} void Widget::onNewClientConnected(){if(_tcpServer->hasPendingConnections()){_tcpSocket = _tcpServer->nextPendingConnection(); if(!_tcpSocket->isValid()) return; connect(_tcpSocket,&QTcpSocket::readyRead,this,&Widget::onRecvData); connect(_tcpSocket,&QTcpSocket::disconnected,this,&Widget::onClientDisconnected); }} void Widget::onRecvData(){if(!_tcpSocket) return; QString recvData=https://www.it610.com/article/_tcpSocket->readAll(); qDebug()<<"recvData:"<ui->recvEdit->append(recvData); } void Widget::onClientDisconnected(){QString clientIp = _tcpSocket->peerAddress().toString(); this->ui->recvEdit->append(clientIp+" is Drop line!"); }

QTcpClient客户端代码（包含.h和.cpp）:
/.h
#ifndef WIDGET_H#define WIDGET_H #include #include QT_BEGIN_NAMESPACEnamespace Ui { class Widget; }QT_END_NAMESPACE class Widget : public QWidget{Q_OBJECT public:Widget(QWidget *parent = nullptr); ~Widget(); private:void Init(); protected slots:void onSendBtnClicked(); void onRecvData(); private:Ui::Widget *ui; private:QTcpSocket *_tcpClient; }; #endif // WIDGET_H /.cpp#include "widget.h"#include "ui_widget.h" #define MyTcpPort 8886 Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget),_tcpClient(nullptr){ui->setupUi(this); connect(this->ui->btn_send,&QPushButton::clicked,this,&Widget::onSendBtnClicked); Init(); setWindowTitle("客户端"); } Widget::~Widget(){delete ui; if(_tcpClient){_tcpClient->close(); _tcpClient->deleteLater(); }} void Widget::Init(){_tcpClient=new QTcpSocket; _tcpClient->abort(); _tcpClient->connectToHost("127.0.0.1",MyTcpPort); if(!_tcpClient->waitForConnected(2000)){qDebug()<<"connect is failed!"; return; }qDebug()<<"connect is successful"; connect(_tcpClient,&QTcpSocket::readyRead,this,&Widget::onRecvData); } void Widget::onSendBtnClicked(){if(!_tcpClient) return; QString wStr=ui->inputEdit->text(); int ret = _tcpClient->write(wStr.toStdString().c_str()); if(ret<0){qDebug()<<"send data is failed"; }qDebug()<<"send data is successful!"; } void Widget::onRecvData(){if(!_tcpClient) return; QString recvData= https://www.it610.com/article/_tcpClient->readAll(); ui->recvEdit->append(recvData); qDebug()<<"recvData:"<
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