Qt: 基于QTcpSocket的聊天程序

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效果图：

原理：

用到的库：QTcpServer，QTcpServer，QHostAddress，QtNetwork。

源码：

服务器端：

//mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QtNetwork>#include <QTcpServer>#include <QTcpSocket>#include <QTimer>#include <QByteArray>namespace Ui{class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();public:    void init();private slots:    void sendMessage(); //发送消息    void onReciveData();  //接收数据    void newListen(); //建立tcp监听事件    void acceptConnection(); //接收客户端连接    void showError(QAbstractSocket::SocketError); //错误输出private:    Ui::MainWindow *ui;private:    QTcpSocket *tcpSocket;    QTcpServer *tcpServer;   // QTimer *timer;    QByteArray mChat;};#endif // MAINWINDOW_H

//mainwindow.cpp

#include <QObject>#include <QString>#include <QTextEdit>#include <QHostAddress>#include <QByteArray>#include "mainwindow.h"#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),ui(new Ui::MainWindow){    ui->setupUi(this);    init();    setWindowTitle(QString::fromLocal8Bit("服务器端"));    connect(ui->sendBtn,SIGNAL(clicked(bool)),SLOT(sendMessage()));}MainWindow::~MainWindow(){    delete ui;}void MainWindow::init(){   // timer = new QTimer;    tcpServer = new QTcpServer;    tcpSocket = new QTcpSocket;    newListen();    connect(tcpServer,SIGNAL(newConnection()),SLOT(acceptConnection()));    connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),SLOT(showError(QAbstractSocket::SocketError)));}void MainWindow::sendMessage()  //发送数据{    QString textEdit = ui->lineEdit->text();    QString strData =QString::fromLocal8Bit("Time: ") + QTime::currentTime().toString() + "\n" + textEdit.toLocal8Bit() + "\n";    QByteArray sendMessage = strData.toLocal8Bit();    mChat += ("Send " + sendMessage);    ui->textEdit->setText(mChat);    tcpSocket->write(sendMessage);}void MainWindow::onReciveData()  //读取数据{    QString data = tcpSocket->readAll();    qDebug()<<data;    mChat +=("Recv " + data);    ui->textEdit->setText(mChat);}void MainWindow::newListen(){    if(!tcpServer->listen(QHostAddress::Any,6666))    {        qDebug()<<tcpServer->errorString();        tcpServer->close();    }}void MainWindow::acceptConnection(){    tcpSocket = tcpServer->nextPendingConnection();    connect(tcpSocket,SIGNAL(readyRead()),SLOT(onReciveData()));}void MainWindow::showError(QAbstractSocket::SocketError){    qDebug()<<tcpSocket->errorString();    tcpSocket->close();}

客户端：

//mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QtNetwork>#include <QTcpServer>#include <QTcpSocket>#include <QTimer>#include <QAbstractSocket>namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();public:    void init();    void newTcpConnect();private slots:    void onReciveData();    void onSendMessage();    void onShowError(QAbstractSocket::SocketError);private:    QTcpSocket *tcpSocket;    QByteArray mChat;private:    Ui::MainWindow *ui;};#endif // MAINWINDOW_H

//mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include <QDebug>MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    setWindowTitle(QString::fromLocal8Bit("客户端"));    init();    connect(ui->sendBtn,SIGNAL(clicked(bool)),SLOT(onSendMessage()));}MainWindow::~MainWindow(){    delete ui;}void MainWindow::init(){    tcpSocket = new QTcpSocket;    newTcpConnect();    connect(tcpSocket,SIGNAL(readyRead()),SLOT(onReciveData()));}void MainWindow::newTcpConnect(){    tcpSocket->abort();    tcpSocket->connectToHost("127.0.0.1",6666);}void MainWindow::onReciveData(){    QString data = tcpSocket->readAll();    qDebug()<<data;    mChat += ("Recv " + data);    ui->textEdit->setText(mChat);}void MainWindow::onSendMessage(){    QString textEdit = ui->lineEdit->text();    QString strData =QString::fromLocal8Bit("Time: ") + QTime::currentTime().toString() + "\n" + textEdit.toLocal8Bit() +"\n";    QByteArray sendMessage = strData.toLocal8Bit();    mChat+= ("Send " + sendMessage);    ui->textEdit->setText(mChat);    tcpSocket->write(sendMessage);}void MainWindow::onShowError(QAbstractSocket::SocketError){    qDebug()<<tcpSocket->errorString();    tcpSocket->close();}

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