QT实现TCP服务器客户端搭建的代码，现象

1.效果

2.服务器：

   2.1：ui界面

2.2：头文件

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#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 newConnection_slot();

    void readyRead_slot();

private:
    Ui::Widget *ui;
    QTcpServer *server;
    QList clientList;
};
#endif // WIDGET_H

2.3：cpp文件

main:

#include "widget.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

函数封装：

#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::newConnection_slot);
}

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


void Widget::on_pushButton_clicked()
{
    if(ui->pushButton->text()=="启动")
    {
        ui->pushButton->setText("关闭");
        quint16 port=ui->lineEdit->text().toUInt();
        if(!server->listen(QHostAddress::Any,port))
        {
            QMessageBox::information(this,"失败","监听失败");
        }else
        {
            QMessageBox::information(this,"成功","服务器启动成功");
        }
    }else{
        for(int i=0;iclose();
        ui->pushButton->setText("启动");
    }
}

void Widget::newConnection_slot()
{
    qDebug()<<"您有新的客户端发来了连接请求了";
    QTcpSocket *s=server->nextPendingConnection();
    clientList.push_back(s);
    connect(s,&QTcpSocket::readyRead,this,&Widget::readyRead_slot);

}

void Widget::readyRead_slot()
{
   qDebug()<<"有新的客户端信息发来了";
   for(int i=0;istate()==0)
      {
          clientList.removeAt(i);
      }
   }

   for(int i=0;ibytesAvailable()!=0)
       {
           QByteArray msg=clientList[i]->readAll();
           ui->msgWidget->addItem(QString::fromLocal8Bit(msg));
           for(int j=0;jwrite(msg);
           }
       }
   }
}

2.4：pro文件

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

3.客户端：

   3.1：ui界面

3.2：头文件

#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_pushButton_2_clicked();
    void connect_slot();
    void readyRead_slot();

    void on_pushButton_1_clicked();

    void on_pushButton_3_clicked();
    void disconnected_slot();

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

3.3：cpp文件

main:

#include "widget.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

函数封装：

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

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

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

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

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


void Widget::on_pushButton_2_clicked()
{
    userName=ui->lineEdit_2->text();
    QString ip=ui->lineEdit_3->text();
    quint16 port=ui->lineEdit_4->text().toUInt();
    socket->connectToHost(ip,port);
}

void Widget::connect_slot()
{
    QMessageBox::information(this,"成功","您已经成功进入聊天室");

    QString msg=userName +":进入聊天室";
    socket->write(msg.toLocal8Bit());
}

void Widget::readyRead_slot()
{
    QByteArray msg=socket->readAll();
    ui->listWidget->addItem(QString::fromLocal8Bit(msg));
}

void Widget::on_pushButton_1_clicked()
{
    QString msg =userName+":"+ui->lineEdit->text();
    socket->write(msg.toLocal8Bit());
    ui->lineEdit->clear();
}

void Widget::on_pushButton_3_clicked()
{
    QString msg=userName+":离开聊天室";
    socket->write(msg.toLocal8Bit());
    socket->disconnectFromHost();
}

void Widget::disconnected_slot()
{
    QMessageBox::information(this,"提示","退出成功");
}

3.4：pro文件

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target