服务器

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);server=new QTcpServer(this);
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{quint16 port=ui->lineEdit->text().toUInt();if(!server->listen(QHostAddress::Any,port)){QMessageBox::critical(this,"错误","服务器启动失败");return;}else{QMessageBox::information(this,"成功","服务器启动成功");}connect(server,&QTcpServer::newConnection,this,&Widget::newConnection_slot);
}void Widget::newConnection_slot()
{QTcpSocket *s;s=server->nextPendingConnection();list.push_back(s);connect(s,&QTcpSocket::readyRead,this,&Widget::readyRead_sloat);
}void Widget::readyRead_sloat()
{for(int i=0;i<list.count();i++){if(!list[i]->state()){list.removeAt(i);}}for(int i=0;i<list.count();i++){if(list[i]->bytesAvailable()){QByteArray msg=list[i]->readAll();ui->listWidget->addItem(QString::fromLocal8Bit(msg));for(int j=0;j<list.count();j++){list[j]->write(msg);}}}
}

客户端

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);connect(socket,&QTcpSocket::connected,this,&Widget::connected_slot);connect(socket,&QTcpSocket::readyRead,this,&Widget::readtRead_slot);}Widget::~Widget()
{delete ui;
}void Widget::on_lj_btn_clicked()
{username=ui->name_edit->text();quint16 port=ui->port_edit->text().toUInt();QString ipname=ui->ip_edit->text();socket->connectToHost(ipname,port);
}void Widget::connected_slot()
{QString s=username+"上线";socket->write(s.toLocal8Bit());QMessageBox::information(this,"成功","连接成功");}void Widget::readtRead_slot()
{QByteArray s=socket->readAll();ui->listWidget->addItem(QString::fromLocal8Bit(s));
}void Widget::on_fs_btn_clicked()
{QString s=username+":"+ui->xx_edit->text();socket->write(s.toLocal8Bit());ui->xx_edit->clear();
}void Widget::on_dk_btn_clicked()
{QString s=username+"退出聊天室";socket->write(s.toLocal8Bit());socket->disconnectFromHost();QMessageBox::information(this,"退出","成功断开");
}