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();
}