QT制作TCP服务器

 1，主界面

2，代码

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 

#include    
#include    

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

private:
    QLabel  *LabListen;//状态栏标签
    QLabel  *LabSocketState;//状态栏标签

    QTcpServer *tcpServer; //TCP服务器

    QTcpSocket *tcpSocket;//TCP通讯的Socket

    QString getLocalIP();//获取本机IP地址

protected:
    void    closeEvent(QCloseEvent *event);

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
//自定义槽函数
    void    onNewConnection();//QTcpServer的newConnection()信号

    void    onSocketStateChange(QAbstractSocket::SocketState socketState);
    void    onClientConnected(); //Client Socket connected
    void    onClientDisconnected();//Client Socket disconnected
    void    onSocketReadyRead();//读取socket传入的数据
//UI生成的
    void on_actStart_triggered();

    void on_actStop_triggered();

    void on_actClear_triggered();

    void on_btnSend_clicked();

    void on_actHostInfo_triggered();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

 

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include    


QString MainWindow::getLocalIP()
{//获取本机IPv4地址
    QString hostName=QHostInfo::localHostName();//本地主机名
    QHostInfo   hostInfo=QHostInfo::fromName(hostName);
    QString   localIP="";

    QList addList=hostInfo.addresses();//

    if (!addList.isEmpty())
    for (int i=0;iisListening())
        tcpServer->close();;//停止网络监听
    event->accept();
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    LabListen=new QLabel(u8"监听状态:");
    LabListen->setMinimumWidth(150);
    ui->statusBar->addWidget(LabListen);

    LabSocketState=new QLabel(u8"Socket状态：");//
    LabSocketState->setMinimumWidth(200);
    ui->statusBar->addWidget(LabSocketState);

    QString localIP=getLocalIP();//本机IP
    this->setWindowTitle(this->windowTitle()+u8"----本机IP："+localIP);
    ui->comboIP->addItem(localIP);

    tcpServer=new QTcpServer(this);
    connect(tcpServer,SIGNAL(newConnection()),this,SLOT(onNewConnection()));
}

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

void MainWindow::onNewConnection()
{
//    ui->plainTextEdit->appendPlainText("有新连接");
    tcpSocket = tcpServer->nextPendingConnection(); //创建socket

    connect(tcpSocket, SIGNAL(connected()),
            this, SLOT(onClientConnected()));
    onClientConnected();//

    connect(tcpSocket, SIGNAL(disconnected()),
            this, SLOT(onClientDisconnected()));

    connect(tcpSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),
            this,SLOT(onSocketStateChange(QAbstractSocket::SocketState)));
    onSocketStateChange(tcpSocket->state());

    connect(tcpSocket,SIGNAL(readyRead()),
            this,SLOT(onSocketReadyRead()));
}

void MainWindow::onSocketStateChange(QAbstractSocket::SocketState socketState)
{//socket状态变化时
    switch(socketState)
    {
    case QAbstractSocket::UnconnectedState:
        LabSocketState->setText(u8"scoket状态：UnconnectedState");
        break;
    case QAbstractSocket::HostLookupState:
        LabSocketState->setText(u8"scoket状态：HostLookupState");
        break;
    case QAbstractSocket::ConnectingState:
        LabSocketState->setText(u8"scoket状态：ConnectingState");
        break;

    case QAbstractSocket::ConnectedState:
        LabSocketState->setText(u8"scoket状态：ConnectedState");
        break;

    case QAbstractSocket::BoundState:
        LabSocketState->setText(u8"scoket状态：BoundState");
        break;

    case QAbstractSocket::ClosingState:
        LabSocketState->setText(u8"scoket状态：ClosingState");
        break;

    case QAbstractSocket::ListeningState:
        LabSocketState->setText(u8"scoket状态：ListeningState");
    }
}

void MainWindow::onClientConnected()
{//客户端接入时
    ui->plainTextEdit->appendPlainText(u8"**client socket connected");
    ui->plainTextEdit->appendPlainText(u8"**peer address:"+
                                   tcpSocket->peerAddress().toString());
    ui->plainTextEdit->appendPlainText(u8"**peer port:"+
                                   QString::number(tcpSocket->peerPort()));
}

void MainWindow::onClientDisconnected()
{//客户端断开连接时
    ui->plainTextEdit->appendPlainText(u8"**client socket disconnected");
    tcpSocket->deleteLater();
    //    deleteLater();//QObject::deleteLater();
}

void MainWindow::onSocketReadyRead()
{//读取缓冲区行文本
//    QStringList   lines;
    while(tcpSocket->canReadLine())
        ui->plainTextEdit->appendPlainText("[in] "+tcpSocket->readLine());
//        lines.append(clientConnection->readLine());
}

void MainWindow::on_actStart_triggered()
{//开始监听
    QString     IP=ui->comboIP->currentText();//IP地址
    quint16     port=ui->spinPort->value();//端口
    QHostAddress    addr(IP);
    tcpServer->listen(addr,port);//
//    tcpServer->listen(QHostAddress::LocalHost,port);// Equivalent to QHostAddress("127.0.0.1").
    ui->plainTextEdit->appendPlainText(u8"**开始监听...");
    ui->plainTextEdit->appendPlainText(u8"**服务器地址："
                       +tcpServer->serverAddress().toString());
    ui->plainTextEdit->appendPlainText(u8"**服务器端口："
                       +QString::number(tcpServer->serverPort()));

    ui->actStart->setEnabled(false);
    ui->actStop->setEnabled(true);

    LabListen->setText(u8"监听状态：正在监听");
}

void MainWindow::on_actStop_triggered()
{//停止监听
    if (tcpServer->isListening()) //tcpServer正在监听
    {
        tcpServer->close();//停止监听
        ui->actStart->setEnabled(true);
        ui->actStop->setEnabled(false);
        LabListen->setText(u8"监听状态：已停止监听");
    }
}

void MainWindow::on_actClear_triggered()
{
    ui->plainTextEdit->clear();
}

void MainWindow::on_btnSend_clicked()
{//发送一行字符串，以换行符结束
    QString  msg=ui->editMsg->text();
    ui->plainTextEdit->appendPlainText("[out] "+msg);
    ui->editMsg->clear();
    ui->editMsg->setFocus();

    QByteArray  str=msg.toUtf8();
    str.append('\n');//添加一个换行符
    tcpSocket->write(str);
}

void MainWindow::on_actHostInfo_triggered()
{//获取本机地址
    QString hostName=QHostInfo::localHostName();//本地主机名
    ui->plainTextEdit->appendPlainText(u8"本机主机名："+hostName+"\n");
    QHostInfo   hostInfo=QHostInfo::fromName(hostName);

    QList addList=hostInfo.addresses();//
    if (!addList.isEmpty())
    for (int i=0;iplainTextEdit->appendPlainText(u8"本机IP地址："+aHost.toString());
            if (ui->comboIP->findText(IP)<0)
                ui->comboIP->addItem(IP);
        }
    }

}