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();
}