C++ Qt多线程 TcpSocket服务器实例

服务器:
incomming
incomming.pro
#-------------------------------------------------
#
# Project created by QtCreator 2016-04-08T09:25:22
#
#-------------------------------------------------

QT       += core gui
QT        +=network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = incomming
TEMPLATE = app

SOURCES += main.cpp\
mainwindow.cpp \
myserver.cpp \
socketthread.cpp \
mytcpsocket.cpp

HEADERS  += mainwindow.h \
myserver.h \
socketthread.h \
mytcpsocket.h

FORMS    += mainwindow.ui

mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
class QTcpSocket;
class myserver;
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
private:
myserver * server;
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

myserver.h
#ifndef MYSERVER
#define MYSERVER
#include<QObject>
#include<QTcpServer>
#include<QWidget>
class myserver :public QTcpServer{
Q_OBJECT
public:
myserver(QWidget * parent);
protected:
virtual void incomingConnection(qintptr socketDescriptor);

};
//|定义的结束 必须加;
#endif // MYSERVER

mytcpsocket.h
#ifndef MYTCPSOCKET
#define MYTCPSOCKET
#include<QTcpSocket>

class mytcpsocket :public QTcpSocket
{
Q_OBJECT
public:
mytcpsocket(QWidget * parent,qintptr p);
private slots:
void on_discon();

public:
void on_connected();

};
#endif // MYTCPSOCKET

socketthread.h

#ifndef SOCKETTHREAD
#define SOCKETTHREAD
#include<QThread>
#include<QTcpSocket>
#include<QWidget>
class mytcpsocket;
class socketThread :public QThread
{
private:
qintptr ptr;
mytcpsocket * socket;
public:
socketThread(QWidget * parent,qintptr p);
protected:
virtual void run();

};
#endif // SOCKETTHREAD

mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include"myserver.h"
#include<QHostAddress>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->server=new myserver(this);
this->server->listen(QHostAddress::LocalHost,520);
}

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

myserver.cpp
#include"myserver.h"
#include<QMessageBox>
#include"mytcpsocket.h"
#include"socketthread.h"
myserver::myserver(QWidget * parent):QTcpServer(parent){

}
void myserver::incomingConnection(qintptr socketDescriptor)
{
QMessageBox::about(0,"提示","有新连接");
socketThread * thread=new socketThread(0,socketDescriptor);
thread->start();

/*
mytcpsocket * socket=new mytcpsocket(0,socketDescriptor);
QThread * thread=new QThread();
socket->moveToThread(thread);
thread->start();
*/

}

mytcpsocket.cpp
#include"mytcpsocket.h"
#include<QByteArray>
#include<QDataStream>
#include<QString>
#include<QMessageBox>
#include<QDebug>
mytcpsocket::mytcpsocket(QWidget *parent,qintptr p):QTcpSocket(0)
{

//connect(this,SIGNAL(),this,SLOT(on_connected()));
this->setSocketDescriptor(p);
this->on_connected();
this->connect(this,SIGNAL(disconnected()),this,SLOT(on_discon()));

}
void mytcpsocket::on_connected()
{

QByteArray arr;
QDataStream dts(&arr,QIODevice::WriteOnly);
dts<<QString("这是数据");
this->write(arr);
//QMessageBox::about(0,"x","发送成功！");
qDebug()<<"发送成功";

}
void mytcpsocket::on_discon()
{
qDebug()<<"有一个客户端断开！";
}

socketthread.cpp
#include"socketthread.h"
#include<QString>
#include<QByteArray>
#include<QDataStream>
#include<QMessageBox>
#include<QDebug>
#include"mytcpsocket.h"
socketThread::socketThread(QWidget *parent,qintptr p):QThread(parent)
{

qDebug()<<"QThread构造
7fe0
函数依然在 旧线程";
this->ptr=p;
}

void socketThread::run(){

/*1.QObject->moveToThread(Thread *)会把一个Qt对象移动到一个新线程中运行 默认在run()中调用了 exec()这样 run()执行完后不会
* 直接关闭 线程 还会让它 进入消息循环 直到调用了 结束 槽
* 2.QtcpSocket 的write()函数是异步的 也就是 调用了 后不会立即 发送数据，它会直接往下执行 直到run()的尾部，如果run()没有
* 调用exec()进行消息循环等待，那么 这个线程 直接就结束了，不会再发送。（发送数据失败）
*3.如果在run()中调用了 exec()（发送成功）
*4.如果在 write(QByteArray);后面加一句 socket->waitForBytesWritten()；这里就会阻塞等待 直到数据开始发送，这样
* 不需要exec()在 线程结束之前直接就发送完了
*socket->waitForConnected()
* socket->waitForDisconnected()
* socket->waitForReadyRead()都是一个道理
*/
qDebug()<<"开始新线程";
/* QTcpSocket * socket=new QTcpSocket();
socket->setSocketDescriptor(this->ptr);

QByteArray arr;
QDataStream dts(&arr,QIODevice::WriteOnly);
dts<<QString("这是数据");
socket->write(arr);
*/
mytcpsocket * socket=new mytcpsocket(0,this->ptr);
socket->waitForBytesWritten();
// this->exec();
/*
1.  连接服务器
m_tcpSocket->connectToHost("127.0.0.1", 9877);
connected = m_tcpSocket->waitForConnected();
只有使用waitForConnected()后,QTcpSocket才真正尝试连接服务器，并返回是否连接的结果。

2. 写数据
m_tcpSocket->write(str.toStdString().c_str(), strlen(str.toStdString().c_str()));
m_tcpSocket->waitForBytesWritten();
当使用waitForBytesWritten()后，QTcpSocket才真正发送数据。
m_tcpSocket->write(str1.toStdString().c_str(), strlen(str1.toStdString().c_str()));
m_tcpSocket->write(str2.toStdString().c_str(), strlen(str2.toStdString().c_str()));
的结果是发送了str1str2

3. 断开与服务器的连接
m_tcpSocket->disconnectFromHost()
m_tcpSocket->waitForDisconnected()

4. 善于使用QTcpSocket的SIGNAL：connected(), disconnected(), error(QAbstractSocket::SocketError)
配合自定义私有开关变量bool connected， QTimer
可以实现自动重连接等逻辑。

*/
}

main.cpp
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();
}

/***********************/

客户端
useincomming
useincomming.pro
#-------------------------------------------------
#
# Project created by QtCreator 2016-04-08T09:36:28
#
#-------------------------------------------------

QT       += core gui
QT       +=network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = useincomming
TEMPLATE = app

SOURCES += main.cpp\
mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
class QTcpSocket;
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
QTcpSocket * socket;
private:
Ui::MainWindow *ui;
private slots:
void on_readyread();
void on_conn();
};

#endif // MAINWINDOW_H

mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QTcpSocket>
#include<QHostAddress>
#include<QString>
#include<QByteArray>
#include<QDataStream>
#include<QMessageBox>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->socket=new QTcpSocket(this);
this->socket->connectToHost(QHostAddress::LocalHost,520);
connect(this->socket,SIGNAL(connected()),this,SLOT(on_conn()));
connect(this->socket,SIGNAL(readyRead()),this,SLOT(on_readyread()));
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_readyread()
{
QMessageBox::about(this,"提示","开始接受");
QByteArray array=this->socket->readAll();
QDataStream dts(&array,QIODevice::ReadOnly);
QString data;
dts>>data;
QMessageBox::about(this,"提示",data);

}
void MainWindow::on_conn()
{
QMessageBox::about(this,"提示","连接成功");
}

main.cpp
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();
}