Socket之TCP-IP

• 通常的TCP/IP流程如下：

　　TCP/IP的通讯更像是打电话，连接上通了确认是自己拨叫的用户之后才能进行正常通话，更加安全合理。

 

• Qt中的TCP/IP流程如下：

　　Qt中流程和普通的思路一样，只是封装成了自己的函数，使用更加方便

 

• 实现的效果如下

 

• 参考代码如下：

　　服务器.h文件：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>
#include <QString>
namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

private slots:
    void on_send_clicked();
    void communication();
    void on_disconnect_clicked();
    void showtext();
private:
    Ui::Widget *ui;
    QTcpServer *TcpServer;
    QTcpSocket *TcpSocket;
};

#endif // WIDGET_H

　　服务器.cpp文件：

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

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    TcpServer = new QTcpServer(this);
    TcpSocket = NULL;
    setWindowTitle("服务器：6666");
    TcpServer->listen(QHostAddress::Any,6666);
     connect(TcpServer,&QTcpServer::newConnection,this,&Widget::communication);


}
void Widget::communication()
{
    TcpSocket=TcpServer->nextPendingConnection();
    QString ip = TcpSocket->peerAddress().toString();
    ui->textEdit->setText(ip);
    connect(TcpSocket,&QTcpSocket::readyRead,this,&Widget::showtext);

}
void Widget::showtext()
{
    QByteArray array = TcpSocket->readAll();
    ui->textEdit->append(array);
}
Widget::~Widget()
{
    delete ui;
}

void Widget::on_send_clicked()
{
    if(TcpSocket == NULL)
       {
        return;
    }
    QString text = ui->textEdit_2->toPlainText();
    TcpSocket->write(text.toUtf8().data());

}

void Widget::on_disconnect_clicked()
{
    if(TcpSocket == NULL)
       {
        return;
    }
    TcpSocket->disconnectFromHost();
    TcpSocket->close();
    TcpSocket = NULL;

}

　　客户端.h文件：

#ifndef SOCKETWIDGET_H
#define SOCKETWIDGET_H

#include <QWidget>
#include <QTcpSocket>
#include <Qstring>
#include <QHostAddress>
namespace Ui {
class SocketWidget;
}

class SocketWidget : public QWidget
{
    Q_OBJECT

public:
    explicit SocketWidget(QWidget *parent = 0);
    ~SocketWidget();
public slots:
    void dealdata();
    void dealread();
private slots:
    void on_send_clicked();

    void on_disconnect_clicked();

    void on_connect_clicked();

private:
    Ui::SocketWidget *ui;
    QTcpSocket *TcpSocket;
};

#endif // SOCKETWIDGET_H

　　客户端.cpp文件：

#include "socketwidget.h"
#include "ui_socketwidget.h"

SocketWidget::SocketWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::SocketWidget)
{
    ui->setupUi(this);
    TcpSocket = new QTcpSocket(this);
    setWindowTitle("客户端");
    connect(TcpSocket,&QTcpSocket::connected,this,&SocketWidget::dealdata);
    connect(TcpSocket,&QTcpSocket::readyRead,this,&SocketWidget::dealread);
}
void SocketWidget::dealdata()
{
    QString str= "已连接服务器";
    ui->read->setText(str);
}
SocketWidget::~SocketWidget()
{
    delete ui;
}
void SocketWidget::dealread()
{
    QByteArray array = TcpSocket->readAll();
    ui->read->append(array);
}
void SocketWidget::on_send_clicked()
{
    QString sendtext = ui->write->toPlainText();
    TcpSocket->write(sendtext.toUtf8().data());
//发送数据
}

void SocketWidget::on_disconnect_clicked()
{
    TcpSocket->disconnectFromHost();
    TcpSocket->close();
}

void SocketWidget::on_connect_clicked()
{
    quint16  port = ui->port->toPlainText().toInt();
    QString ip =  ui->ip->toPlainText();
    TcpSocket->connectToHost(QHostAddress(ip),port);
//建立主动连接
}