今日任务：QT实现TCP服务器客户端搭建的代码，现象

 ser：

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    server = new QTcpServer(this);
    connect(server,&QTcpServer::newConnection,this,&Widget::newConnectionSlot);

}

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


void Widget::on_startButton_clicked()
{
    quint16 port = ui->portEdit->text().toUInt();
    //监听客户端的连接请求
    if(!server->listen(QHostAddress::Any,port)){
        QMessageBox::information(this,"失败","监听失败");
        return;
    }else{
        QMessageBox::information(this,"成功","服务器启动成功");
    }
}

void Widget::newConnectionSlot()
{
    //qDebug()<<"您有新的客户端发来请求";

    QTcpSocket *s = server->nextPendingConnection();
    clientList.push_back(s);
    connect(s,&QTcpSocket::readyRead,this,&Widget::readyReadSlot);
}

void Widget::readyReadSlot()
{
    for(int i = 0;i < clientList.size();i++){
        //判断当前套接字是否有效连接
        if(!clientList[i]->state()){
            //将该套接字移除客户端容易
            clientList.removeAt(i);
        }
    }
    for(int i = 0;i < clientList.size();i++){
        if(clientList[i]->bytesAvailable()){
            //将该套接字的数据读取出来
            QByteArray msg = clientList[i]->readAll();
            ui->msgWidget->addItem(QString::fromLocal8Bit(msg));

            for(int j = 0;j < clientList.size();j++){
                clientList[j]->write(msg);
            }
        }
    }
}

cli：

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    server = new QTcpServer(this);
    connect(server,&QTcpServer::newConnection,this,&Widget::newConnectionSlot);

}

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


void Widget::on_startButton_clicked()
{
    quint16 port = ui->portEdit->text().toUInt();
    //监听客户端的连接请求
    if(!server->listen(QHostAddress::Any,port)){
        QMessageBox::information(this,"失败","监听失败");
        return;
    }else{
        QMessageBox::information(this,"成功","服务器启动成功");
    }
}

void Widget::newConnectionSlot()
{
    //qDebug()<<"您有新的客户端发来请求";

    QTcpSocket *s = server->nextPendingConnection();
    clientList.push_back(s);
    connect(s,&QTcpSocket::readyRead,this,&Widget::readyReadSlot);
}

void Widget::readyReadSlot()
{
    for(int i = 0;i < clientList.size();i++){
        //判断当前套接字是否有效连接
        if(!clientList[i]->state()){
            //将该套接字移除客户端容易
            clientList.removeAt(i);
        }
    }
    for(int i = 0;i < clientList.size();i++){
        if(clientList[i]->bytesAvailable()){
            //将该套接字的数据读取出来
            QByteArray msg = clientList[i]->readAll();
            ui->msgWidget->addItem(QString::fromLocal8Bit(msg));

            for(int j = 0;j < clientList.size();j++){
                clientList[j]->write(msg);
            }
        }
    }
}

效果图：