服务器

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QLine>
#include <QTcpServer>
#include <QTcpSocket>
#include <QMessageBox>

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_startbtn_clicked();

    void newConnection_slot();
    void readyRead_slot();
private:
    Ui::Widget *ui;
    //服务器指针
    QTcpServer *server;
    //客户端容器
    QList<QTcpSocket *> clientlist;

};
#endif // WIDGET_H

主函数

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QLine>
#include <QTcpServer>
#include <QTcpSocket>
#include <QMessageBox>

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_startbtn_clicked();

    void newConnection_slot();
    void readyRead_slot();
private:
    Ui::Widget *ui;
    //服务器指针
    QTcpServer *server;
    //客户端容器
    QList<QTcpSocket *> clientlist;

};
#endif // WIDGET_H

客户端

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTcpSocket>
#include <QMessageBox>
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_connectBtn_clicked();

    void on_disconnectBtn_clicked();

    void disconnectBtn_slot();
    void connected_slot();
    void readyRead_slot();
private:
    Ui::Widget *ui;
    QTcpSocket *socket;
    QString name;
};
#endif // WIDGET_H

主函数

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //实例化一个客户端
    socket= new QTcpSocket(this);
    //连接
    connect(socket,&QTcpSocket::connected,this,&Widget::connected_slot);
    //读取
    connect(socket,&QTcpSocket::readyRead,this,&Widget::readyRead_slot);
    //断开
    connect(socket,&QTcpSocket::disconnected,this,&Widget::disconnectBtn_slot);
}

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


void Widget::on_sendBtn_clicked()
{
    //组合数据
    QString msg =name+":"+ui->lineEdit->text();
    //发送
    socket->write(msg.toLocal8Bit());
    //清空
    ui->lineEdit->clear();
}

void Widget::on_connectBtn_clicked()
{
    //用户名
    name=ui->userNameEdit->text();
    //主机地址
    QString ip=ui->ipEdit->text();
    //端口号
    quint16 port=ui->portEdit->text().toUInt();
    socket->connectToHost(ip,port);
}

void Widget::on_disconnectBtn_clicked()
{
    QString msg=name+":离开聊天室";

    socket->write(msg.toLocal8Bit());
    //发送断开信号
    socket->disconnectFromHost();
}


void Widget::disconnectBtn_slot()
{
    QMessageBox::information(this,"提示","推出成功");
}
void Widget::connected_slot()
{
    QMessageBox::information(this,"成功","您已经成功进入聊天室");

    QString msg=name+":进入聊天室";

    socket->write(msg.toLocal8Bit());
}
void Widget::readyRead_slot()
{
    QByteArray msg =socket->readAll();

    ui->msgWid->addItem(QString::fromLocal8Bit(msg));
}

现象