Qt基於TCP實現客戶端與服務端的連接

#ifndef CLIENTWIDGET_H
#define CLIENTWIDGET_H

#include <QWidget>
#include "ui_ClientWidget.h"
#include <QTcpSocket>
#include <QHostAddress>
#include <QTextCodec>

class ClientWidget : public QWidget, public Ui::ClientWidget
{
    Q_OBJECT

public:
    ClientWidget(QWidget *parent = 0);
    ~ClientWidget();

private slots:
    //連接按鈕
    void onConnectButtonClicked();
    //
    void onTextEditRead();
    //發送按鈕
    void onButtonSendClicked();

    //獲取對方發送的內容
    void onRecesiveDataFromServer();

    //斷開連接
    void onDisConnect();
private:
    //Ui::ClientWidget ui;
    QTcpSocket *tcpSocket;
};

#endif // CLIENTWIDGET_H

#include "stdafx.h"
#include "ClientWidget.h"
#include <QPushButton>


ClientWidget::ClientWidget(QWidget *parent)
    : QWidget(parent)
{
    setupUi(this);
    setWindowTitle(QString::fromWCharArray(L"客戶端"));

    tcpSocket = NULL;

    //分配空間，指定父對象
    tcpSocket = new QTcpSocket(this);

    ButtonDisconnect->setEnabled(false);
    //tcpSocket->abort();

    //發送與服務器連接信號
    connect(connectBtn, SIGNAL(clicked()), this, SLOT(onConnectButtonClicked()));
    
    //連接成功後接收到connected信號
    connect(tcpSocket, SIGNAL(connected()), this, SLOT(onTextEditRead()));
    //給服務器發送內容
    connect(ButtonSend, SIGNAL(clicked()), this, SLOT(onButtonSendClicked()));
    //接收來自服務器的內容，信號readReady
    connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(onRecesiveDataFromServer()));

    connect(ButtonDisconnect, SIGNAL(clicked()), this, SLOT(onDisConnect()));
    
}

ClientWidget::~ClientWidget()
{

}

void ClientWidget::onConnectButtonClicked()
{
    //獲取服務器IP和端口
    QString ipStr = LineEditIPName->text();
    qint16 portName = LineEditPortName->text().toInt();
    QHostAddress ip = QHostAddress(ipStr);
    //主動和服務器建立連接
    tcpSocket->connectToHost(ip, portName);
}

void ClientWidget::onTextEditRead()
{
    TextEditRead->setText(QString::fromLocal8Bit("成功和服務器建立好連接！！！"));

    connectBtn->setEnabled(false);
    ButtonDisconnect->setEnabled(true);

}

void ClientWidget::onButtonSendClicked()
{
    if (tcpSocket == NULL)
    {
        return;
    }
    //獲取編輯框內容
    QString str = TextEditWrite->toPlainText();

    //發送文本內容
    tcpSocket->write(str.toUtf8().data());

    TextEditWrite->clear();
}

void ClientWidget::onRecesiveDataFromServer()
{
    QByteArray arrayAll = tcpSocket->readAll();

    QTextCodec *tc = QTextCodec::codecForName("UTF-8");
    QString str = tc->toUnicode(arrayAll);

    //追加到讀取編輯區中
    TextEditRead->append(str);
}

void ClientWidget::onDisConnect()
{
    if (tcpSocket == NULL)
    {
        return;
    }

    tcpSocket->disconnectFromHost();

    tcpSocket->close();
    connectBtn->setEnabled(true);

    ButtonDisconnect->setEnabled(false);
    
    TextEditRead->setText(QString::fromLocal8Bit("連接已斷開！！！"));
}

#ifndef SERVERWIDGET_H
#define SERVERWIDGET_H

#include <QtGui/QWidget>
#include "ui_ServerWidget.h"
#include <QTcpServer>
#include <QTcpSocket>
#include <QString>
#include <QTextCodec>
class ServerWidget : public QWidget
{
    Q_OBJECT    

public:
    ServerWidget(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~ServerWidget();
    QTcpServer *tcpServer;
    QTcpSocket *tcpSocket;

private slots:
    void OnConnectTcpServer(); 

    void OnSendButtonClicked();

    void OnCloseButtonClicked();

    void OnSeResiveData();

    void OnDisconnected();

private:
    Ui::ServerWidgetClass ui;
};

#endif // SERVERWIDGET_H

#include "stdafx.h"
#include "ServerWidget.h"

ServerWidget::ServerWidget(QWidget *parent, Qt::WFlags flags)
    : QWidget(parent, flags)
{
    ui.setupUi(this);
    tcpServer = NULL;
    tcpSocket = NULL;
    setWindowTitle(QString::fromWCharArray(L"服務器(端口：8888)"));
    //箭筒套接字，指定父對象，讓其自動回收空間
    tcpServer = new QTcpServer(this);
    //監聽並綁定端口
    tcpServer->listen(QHostAddress::Any, 8888);
    
    connect(tcpServer, SIGNAL(newConnection()), this, SLOT(OnConnectTcpServer()));

    connect(ui.sendButton, SIGNAL(clicked()), this, SLOT(OnSendButtonClicked()));

    connect(ui.closeButton, SIGNAL(clicked()), this, SLOT(OnCloseButtonClicked()));

    connect(tcpServer, SIGNAL(disconnected()), this, SLOT(OnDisconnected()));

}

ServerWidget::~ServerWidget()
{
    
}
#include <QDebug>

void ServerWidget::OnConnectTcpServer()
{
    //取出建立好的套接字
    tcpSocket = tcpServer->nextPendingConnection();
    //獲取對方的IP和端口號 
    QString ipStr = tcpSocket->peerAddress().toString();

    qint16 portName = tcpSocket->peerPort();

    QString connectStr = QString::fromLocal8Bit("成功連接");
    
    QString tempStr = QString("[%1 : %2]:" + connectStr).arg(ipStr).arg(portName);

    ui.textRead->setText(tempStr);
     
    connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(OnSeResiveData()));


}

void ServerWidget::OnSendButtonClicked()
{
    if (tcpSocket == NULL)
    {
        return;
    }
    //獲取編輯區的內容
    QString str = ui.textWrite->toPlainText();
    //給對方發送數據。使用套接字是tcpSocket
    tcpSocket->write(str.toUtf8().data());

    ui.textWrite->clear();
}
 
void ServerWidget::OnCloseButtonClicked()
{
    if (tcpSocket == NULL)
    {
        return;
    }

    //主動和客戶端斷開連接
    tcpSocket->disconnectFromHost();
    
    ui.textRead->setText(QString::fromLocal8Bit("連接已斷開！！！"));

    tcpSocket = NULL;

}

void ServerWidget::OnSeResiveData()
{
    //從通信套接字中取出內容
    QByteArray dataAll =  tcpSocket->readAll();

    QTextCodec *tc = QTextCodec::codecForName("UTF-8");

    QString str = tc->toUnicode(dataAll);

    ui.textRead->append(str);


}

void ServerWidget::OnDisconnected()
{
    ui.textRead->setText(QString::fromLocal8Bit("連接已斷開！！！"));

}