Qt工作笔记-多线程时间服务应用

当有客户请求到达时，服务器将启动一个新的进程为它返回当前时间，服务完毕后这个线程将自动退出。

运行截图如下：

服务端：

dialog.h

#ifndef DIALOG_H
#define DIALOG_H#include <QDialog>
#include <QLabel>
#include <QPushButton>
class TimeServer;
class Dialog : public QDialog
{Q_OBJECTpublic:Dialog(QWidget *parent = 0);~Dialog();
public slots:void slotShow();
private:QLabel *Label1;QLabel *Label2;QPushButton *quitBtn;TimeServer *timeServer;int count;
};#endif // DIALOG_H

timeserver.h

#ifndef TIMESERVER_H
#define TIMESERVER_H#include <QObject>
#include <QTcpServer>class Dialog;class TimeServer : public QTcpServer
{Q_OBJECT
public:TimeServer(QObject *parent=0);
protected:void incomingConnection(int socketDescriptor);
private:Dialog *dlg;
};#endif // TIMESERVER_H

timethread.h

#ifndef TIMETHREAD_H

#define TIMETHREAD_H

#include <QObject>

#include <QThread>

#include <QTcpSocket>

class TimeThread : public QThread

    Q_OBJECT

public:

    TimeThread(int socketDescriptor,QObject *parent=0);

    void run();

signals:

    void error(QTcpSocket::SocketError socketError);

private:

    int socketDescriptor;

};

#endif // TIMETHREAD_H

dialog.cpp

#include "dialog.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QMessageBox>
#include "timeserver.h"Dialog::Dialog(QWidget *parent): QDialog(parent)
{setWindowTitle(tr("多线程时间服务器"));Label1 =new QLabel(tr("服务器端口："));Label2 = new QLabel;quitBtn = new QPushButton(tr("退出"));QHBoxLayout *BtnLayout = new QHBoxLayout;BtnLayout->addStretch(1);BtnLayout->addWidget(quitBtn);BtnLayout->addStretch(1);QVBoxLayout *mainLayout = new QVBoxLayout(this);mainLayout->addWidget(Label1);mainLayout->addWidget(Label2);mainLayout->addLayout(BtnLayout);connect(quitBtn,SIGNAL(clicked()),this,SLOT(close()));count=0;timeServer = new TimeServer(this);if(!timeServer->listen()){QMessageBox::critical(this,tr("多线程时间服务器"),tr("无法启动服务器：%1.").arg(timeServer->errorString()));close();return;}Label1->setText(tr("服务器端口：%1.").arg(timeServer->serverPort()));
}Dialog::~Dialog()
{}void Dialog::slotShow()
{Label2->setText(tr("第%1次请求完毕。").arg(++count));
}

main.cpp

#include "dialog.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Dialog w;w.show();return a.exec();
}

timeserver.cpp

#include "timeserver.h"
#include "timethread.h"
#include "dialog.h"TimeServer::TimeServer(QObject *parent):QTcpServer(parent)
{dlg =(Dialog *)parent;
}void TimeServer::incomingConnection(int socketDescriptor)
{TimeThread *thread = new TimeThread(socketDescriptor,0);connect(thread,SIGNAL(finished()),dlg,SLOT(slotShow()));connect(thread,SIGNAL(finished()),thread,SLOT(deleteLater()),Qt::DirectConnection);thread->start();
}

timethread.cpp

#include "timethread.h"
#include <QDateTime>
#include <QByteArray>
#include <QDataStream>TimeThread::TimeThread(int socketDescriptor,QObject *parent):QThread(parent),socketDescriptor(socketDescriptor)
{
}void TimeThread::run()
{QTcpSocket tcpSocket;if(!tcpSocket.setSocketDescriptor(socketDescriptor)){emit error(tcpSocket.error());return;}QByteArray block;QDataStream out(&block,QIODevice::WriteOnly);out.setVersion(QDataStream::Qt_4_3);uint time2u = QDateTime::currentDateTime().toTime_t();out<<time2u;tcpSocket.write(block);tcpSocket.disconnectFromHost();tcpSocket.waitForDisconnected();
}

客户端：

timeclient.h

#ifndef TIMECLIENT_H
#define TIMECLIENT_H#include <QDialog>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QDateTimeEdit>
#include <QTcpSocket>
#include <QAbstractSocket>
#include <QTimerEvent>class TimeClient : public QDialog
{Q_OBJECTpublic:TimeClient(QWidget *parent = 0);~TimeClient();virtual void timerEvent(QTimerEvent *event);public slots:void enableGetBtn();void getTime();void readTime();void showError(QAbstractSocket::SocketError socketError);private:QLabel *serverNameLabel;QLineEdit *serverNameLineEdit;QLabel *portLabel;QLineEdit *portLineEdit;QDateTimeEdit *dateTimeEdit;QLabel *stateLabel;QPushButton *getBtn;QPushButton *quitBtn;uint time2u;QTcpSocket *tcpSocket;int m_timerId;bool startRun;
};#endif // TIMECLIENT_H

main.cpp

#include "timeclient.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);TimeClient w;w.show();return a.exec();
}

timeclient.cpp

#include "timeclient.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGridLayout>
#include <QDataStream>
#include <QMessageBox>TimeClient::TimeClient(QWidget *parent): QDialog(parent)
{setWindowTitle(tr("多线程时间服务客户端"));serverNameLabel =new QLabel(tr("服务器名："));serverNameLineEdit = new QLineEdit("Localhost");portLabel =new QLabel(tr("端口："));portLineEdit = new QLineEdit;QGridLayout *layout = new QGridLayout;layout->addWidget(serverNameLabel,0,0);layout->addWidget(serverNameLineEdit,0,1);layout->addWidget(portLabel,1,0);layout->addWidget(portLineEdit,1,1);dateTimeEdit = new QDateTimeEdit(this);QHBoxLayout *layout1 = new QHBoxLayout;layout1->addWidget(dateTimeEdit);stateLabel =new QLabel(tr("请首先运行时间服务器！"));QHBoxLayout *layout2 = new QHBoxLayout;layout2->addWidget(stateLabel);getBtn = new QPushButton(tr("获取时间"));getBtn->setDefault(true);getBtn->setEnabled(false);quitBtn = new QPushButton(tr("退出"));QHBoxLayout *layout3 = new QHBoxLayout;layout3->addStretch();layout3->addWidget(getBtn);layout3->addWidget(quitBtn);QVBoxLayout *mainLayout = new QVBoxLayout(this);mainLayout->addLayout(layout);mainLayout->addLayout(layout1);mainLayout->addLayout(layout2);mainLayout->addLayout(layout3);connect(serverNameLineEdit,SIGNAL(textChanged(QString)),this,SLOT(enableGetBtn()));connect(portLineEdit,SIGNAL(textChanged(QString)),this,SLOT(enableGetBtn()));connect(getBtn,SIGNAL(clicked()),this,SLOT(getTime()));connect(quitBtn,SIGNAL(clicked()),this,SLOT(close()));tcpSocket = new QTcpSocket(this);connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readTime()));connect(tcpSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(showError(QAbstractSocket::SocketError)));portLineEdit->setFocus();m_timerId=startTimer(1000);startRun=false;
}void TimeClient::timerEvent(QTimerEvent *event){if(event->timerId()==m_timerId && startRun){getTime();}
}TimeClient::~TimeClient()
{}void TimeClient::enableGetBtn()
{getBtn->setEnabled(!serverNameLineEdit->text().isEmpty()&&!portLineEdit->text().isEmpty());
}void TimeClient::getTime()
{getBtn->setEnabled(false);startRun=true;time2u =0;tcpSocket->abort();tcpSocket->connectToHost(serverNameLineEdit->text(),portLineEdit->text().toInt());
}void TimeClient::readTime()
{QDataStream in(tcpSocket);in.setVersion(QDataStream::Qt_4_3);if(time2u==0){if(tcpSocket->bytesAvailable()<(int)sizeof(uint))return;in>>time2u;}dateTimeEdit->setDateTime(QDateTime::fromTime_t(time2u));getBtn->setEnabled(true);
}void TimeClient::showError(QAbstractSocket::SocketError socketError)
{switch (socketError){case QAbstractSocket::RemoteHostClosedError:break;case QAbstractSocket::HostNotFoundError:QMessageBox::information(this, tr("时间服务客户端"),tr("主机不可达！"));break;case QAbstractSocket::ConnectionRefusedError:QMessageBox::information(this, tr("时间服务客户端"),tr("连接被拒绝！"));break;default:QMessageBox::information(this, tr("时间服务客户端"),tr("产生如下错误: %1.").arg(tcpSocket->errorString()));}getBtn->setEnabled(true);
}

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