我们需要实现客户端发消息，服务端接收消息

服务端界面新增接收消息

实现客户端发送和清空

发送数据需要将发送栏的信息转化为QByteArray,然后使用socket的write发送过去

实现服务端的接收

效果演示

代码展示

server
Widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTcpSocket>
#include<QTcpServer>
#define PORT 8080
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 deal();
    void serverrecv();
private:
    Ui::Widget *ui;
    QTcpServer *server;
};
#endif // WIDGET_H

Widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    server=new QTcpServer;
    server->listen(QHostAddress::AnyIPv4,PORT);
    connect(server,&QTcpServer::newConnection,this,&Widget::deal);
}

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

    QTcpSocket* socket=server->nextPendingConnection();
    ui->clientip->setText(socket->peerAddress().toString());
    ui->clientport->setText(QString::number(socket->peerPort()));

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


}
void Widget::serverrecv()
{

    QTcpSocket* socket=(QTcpSocket*)sender();
   // socket->readAll();//QBytearray
    ui->recvinfo->setText(QString(socket->readAll()));

}

client
chat.h

#ifndef CHAT_H
#define CHAT_H

#include <QWidget>
#include<QTcpSocket>
namespace Ui {
class chat;
}

class chat : public QWidget
{
    Q_OBJECT

public:
    explicit chat(QTcpSocket*s,QWidget *parent = nullptr);
    ~chat();

private slots:
    void on_clearbutton_clicked();

    void on_sendbutton_clicked();

private:
    Ui::chat *ui;
    QTcpSocket*socket;
};

#endif // CHAT_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTcpSocket>
#include<QString>
#include <QHostAddress>
#include<QMessageBox>
#include<chat.h>
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_closebutton_clicked();

    void on_connectbutton_clicked();

private:
    Ui::Widget *ui;
    QTcpSocket* socket;
};
#endif // WIDGET_H

chat.cpp

#include "chat.h"
#include "ui_chat.h"

chat::chat(QTcpSocket *s, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::chat)
{
    ui->setupUi(this);
    socket=s;

}

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

void chat::on_clearbutton_clicked()
{
    ui->sendline->clear();
}


void chat::on_sendbutton_clicked()
{
    QByteArray sa;
    sa.append(ui->sendline->text());
    socket->write(sa);

}

widget.cpp

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

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

}

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


void Widget::on_closebutton_clicked()
{
    this->close();
}

void Widget::on_connectbutton_clicked()
{

    QString ip=ui->iplabel->text();
    QString port=ui->portlabel->text();


    socket->connectToHost(QHostAddress(ip),port.toShort());
    connect(socket,&QTcpSocket::connected,[this]()
    {
       QMessageBox::information(this,"连接提示","连接成功");
       this->hide();
       chat *newui=new chat(socket);
       newui->show();

    });


    connect(socket,&QTcpSocket::disconnected,[this]()
    {

         QMessageBox::warning(this,"连接提示","连接异常");



    });









}