利用Qt搭建简单聊天室

服务器：

.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 
#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_pushButton_clicked();
    void on_newConnection_slot();  //给信号声明槽函数
    void on_readyread_solt();
    void send(QString mes);//自定义广播函数
private:
    Ui::Widget *ui;
    QTcpServer * server;

    QListsocketlist;


};
#endif // WIDGET_H

.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //实例化服务器
    server = new QTcpServer(this);





}

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


void Widget::on_pushButton_clicked()
{
    quint16 port =quint16(ui->portEdit->text().toUInt());


    //将服务器设置为监听
    bool lis;
    if(server->listen(QHostAddress::Any,port))
    {
        //将相应的控件设置为不可用状态
        ui->pushButton->setEnabled(false);
        ui->portEdit->setEnabled(false);

        //新客户端连接时发送信号
        connect(server,&QTcpServer::newConnection,this,&Widget::on_newConnection_slot);

    }


}
//槽函数定义
void Widget::on_newConnection_slot()
{
    //获取新客户端连接的套接字
    QTcpSocket * socket = server->nextPendingConnection();
    //将新套接字放入套接字列表中
    socketlist.append(socket);
    //当服务器接收到传来的消息时接收到readyRead信号
    connect(socket, &QTcpSocket::readyRead , this, &Widget::on_readyread_solt);




}

void Widget::on_readyread_solt()
{
    for(qint16 i=0;istate()==false)
        {
            socketlist.removeAt(i);
        }
    }



    //遍历客户端列表找到那个客户端发送消息
    for(qint16 i=0;ibytesAvailable()!=0)
        {
            //获取客户端传输的代读数据
            QString mes = QString::fromLocal8Bit( socketlist.at(i)->readAll());
            ui->listWidget->addItem(mes);
            //并将该消息进行广播
            send(mes);

        }
    }



}
//广播函数
void Widget::send(QString mes)
{
    for(qint16 i=0;iwrite(mes.toLocal8Bit());
    }
}

客户端：

.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_sendbtn_clicked();

    void on_btn_clicked();

    void on_connection_slot();

    void on_disconnection_slot();

    void on_readyread_solt();

private:
    Ui::Widget *ui;
    QTcpSocket *socket; //客户端套接字
    QString uname;
    bool isok;

};
#endif // WIDGET_H

.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    socket = new QTcpSocket(this);
    isok = false;

    connect(socket,&QTcpSocket::connected,this,&Widget::on_connection_slot);

    connect(socket,&QTcpSocket::disconnected,this,&Widget::on_disconnection_slot);

    connect(socket, &QTcpSocket::readyRead , this, &Widget::on_readyread_solt);
}

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


void Widget::on_sendbtn_clicked()
{
    QString mes = uname + ":" + ui->textEdit->text();
    socket->write(mes.toLocal8Bit());
    mes.clear();

}

void Widget::on_btn_clicked()
{
    QString ip = ui->ipEdit->text();
    quint16 port = quint16(ui->portEdit->text().toInt());
    if(isok==false)
    {
        //连接
        socket->connectToHost(QHostAddress(ip),port);
        //按钮文本改完断开
        ui->btn->setText("断开");

        isok=true;
    }else
    {
        //断开服务器
        socket->disconnectFromHost();


        //更改按钮文本
        ui->btn->setText("连接");
        isok=false;
    }
}

void Widget::on_connection_slot()
{
    uname = ui->nameEdit->text();
    QString mes = uname + "加入群聊";
    ui->listWidget->addItem(mes);
    socket->write(mes.toLocal8Bit());
//    mes.clear();
    ui->portEdit->setEnabled(false);
    ui->ipEdit->setEnabled(false);
    ui->nameEdit->setEnabled(false);


}

void Widget::on_disconnection_slot()
{
    QString mes = uname + "离开群聊";
    ui->listWidget->addItem(mes);
    socket->write(mes.toLocal8Bit());
//    mes.clear();
    ui->portEdit->setEnabled(true);
    ui->ipEdit->setEnabled(true);
    ui->nameEdit->setEnabled(true);





}
void Widget::on_readyread_solt()
{
    QString mes = QString::fromLocal8Bit(socket->readAll());

    ui->listWidget->addItem(mes);

}