使用QTcpSocket在两台ubuntu之间实现通讯

重点提取：

1.保证服务端和客户端端口号一致

2.保证服务端和客户端在同一网段(可以通过网线连接)

3保证客户端界面输入的ip是服务段的ip

实现步骤：

首先，构造服务端界面和客户端界面如下

服务端界面

客户端界面

其次具体代码

在.pro文件的QT += core gui下面加入

QT       += network

服务段代码

my_server.h

#ifndef MY_SERVER_H
#define MY_SERVER_H#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>
#include <QString>
namespace Ui {
class My_server;
}class My_server : public QWidget
{Q_OBJECTpublic:explicit My_server(QWidget *parent = nullptr);~My_server();QTcpServer *tcpserver;QTcpSocket *tcpsocket;private slots:void on_connectbt_clicked();void newConnection_Slot();void readyRead_Slot();void on_disconnectbt_clicked();void on_sendbt_clicked();private:Ui::My_server *ui;
};#endif // MY_SERVER_H

my_server.cpp

#include "my_server.h"
#include "ui_my_server.h"My_server::My_server(QWidget *parent) :QWidget(parent),ui(new Ui::My_server)
{ui->setupUi(this);setWindowTitle("服务器");tcpserver=new QTcpServer(this);tcpsocket=new QTcpSocket(this);connect(tcpserver,SIGNAL(newConnection()),this,SLOT(newConnection_Slot()));
//    connect(ui->connect,SIGNAL(clicked(bool)),this,SLOT(on_connectbt_clicked()));
//    connect(ui->disconnect,SIGNAL(clicked(bool)),this,SLOT(on_disconnectbt_clicked()));
//    connect(ui->send,SIGNAL(clicked(bool)),this,SLOT(on_sendbt_clicked()));
}
void My_server::newConnection_Slot()
{//第三步:取出套接字tcpsocket=tcpserver->nextPendingConnection(); //获取已经连接的客户端的SOCKET套接字connect(tcpsocket,SIGNAL(readyRead()),this,SLOT(readyRead_Slot()));//若客户端有消息进来的话,会触发信号readyRead_Slot();//获取对方的IP和端口QString sIp = tcpsocket->peerAddress().toString();quint16 sPort = tcpsocket->peerPort();qDebug() << sIp << sPort;//connect(tcpsocket, SIGNAL(disconnected()), this, SLOT(slotServerDisConnection()));//断开连接的话会触发disconnected();
}
void My_server::readyRead_Slot()
{//第四步:读取套接字的内容//从socket中读出数据QString buf;buf=tcpsocket->readAll();ui->receivewd->appendPlainText(buf);/*或QByteArray baArray = tcpsocket->readAll();QString sMsg = baArray;ui->receivewd->appendPlainText(receivewd);*/
}void My_server::on_connectbt_clicked()//连接服务器
{//第二部步:listen------监听是否有新的连接进来tcpserver->listen(QHostAddress::Any,ui->portnum->text().toUInt());//监听端口号
}void My_server::on_disconnectbt_clicked()//关闭服务器
{tcpserver->close();
}void My_server::on_sendbt_clicked()//发送信息
{
//    toLatin1()
//    tcpsocket->write(ui->sendwd->text().toLatin1());
//    tcpsocket->write(ui->sendwd->text().toLocal8Bit(),ui->sendwd->text().length());tcpsocket->write(ui->sendwd->text().toLocal8Bit().data());
}My_server::~My_server()
{delete ui;
}

客户端代码

my_client.h

#ifndef MY_CLIENT_H
#define MY_CLIENT_H#include <QWidget>
#include <QTcpSocket>
namespace Ui {
class My_client;
}class My_client : public QWidget
{Q_OBJECTpublic:explicit My_client(QWidget *parent = nullptr);~My_client();QTcpSocket *tcpsocket;private slots:void on_openclient_clicked();void connected_SLOT();void readyRead_Slot();void on_closeclient_clicked();void on_sent_clicked();private:Ui::My_client *ui;
};#endif // MY_CLIENT_H

my_client.cpp

#include "my_client.h"
#include "ui_my_client.h"
#include "QString"
#include "stdio.h"
My_client::My_client(QWidget *parent) :QWidget(parent),ui(new Ui::My_client)
{ui->setupUi(this);setWindowTitle("客户端");tcpsocket=new QTcpSocket(this);
//    connect(ui->open,SIGNAL(clicked(bool)),this,SLOT(on_openclient_clicked()));
//    connect(ui->close,SIGNAL(clicked(bool)),this,SLOT(on_closeclient_clicked()));
//    connect(ui->send,SIGNAL(clicked(bool)),this,SLOT(on_sent_clicked()));}
void My_client::connected_SLOT()
{QObject::connect(tcpsocket, &QTcpSocket::readyRead, this, &My_client::readyRead_Slot);
//    connect(tcpsocket,SIGNAL(readyRead()),this,SLOT(readyRead_Slot()));//将信号连接到槽，书写比较明确
}
void My_client::readyRead_Slot()//定义接收信号的槽
{QString buf;buf=tcpsocket->readAll();ui->receivewd->appendPlainText(buf);//接收由tcp发送过来的信息
//    ui->receivewd->appendPlainText(buf.toUtf8());//接收由tcp发送过来的信息
}void My_client::on_openclient_clicked()
{//第一步:创建套接字,与服务端的IP地址和端口号连接.//注:这里的端口号和上面服务端绑定的那个端口号是一样的,别搞错了.//连接服务端tcpsocket->connectToHost(ui->ipnum->text(),ui->portnum->text().toInt());//转为无符号，连接服务器端口connect(tcpsocket,SIGNAL(connected()),this,SLOT(connected_SLOT()));printf("打开客户端 ");/*//成功连接返回true,错误返回falseif(m_tsTcpSocket->waitForConnected()){qDebug() << "connect success";}*/
}void My_client::on_closeclient_clicked()
{tcpsocket->close();printf("关闭客户端 ");
}void My_client::on_sent_clicked()
{tcpsocket->write(ui->sendwd->text().toLocal8Bit().data(),ui->sendwd->text().length());//丽丽//tcpsocket->write(ui->sendwd->text().toLocal8Bit().data());//网上//tcpsocket->write(ui->sendwd->toPlainText().toLatin1());//xie宏伟/*QString str;int iSize = tcpsocket->write(str.toUtf8().data());//返回字节的大小//等待write写完再写下一次的writeif(!tcpsocket->waitForBytesWritten(50000)){return;}if(iSize ==-1) //判断发送是否成功{qDebug() << "write error";return;}
}
My_client::~My_client()
{delete ui;
}