2024.05.10作业 - 技术栈

TCP服务器

头文件

cpp 复制代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>
#include <QList>
#include <QMessageBox>
#include <QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_staetbtn_clicked();
    void newConnection_slot();
    void readyRead_slot();

private:
    Ui::Widget *ui;
    QTcpServer *ser;
    QList<QTcpSocket *> cliList;
};
#endif // WIDGET_H

源文件

cpp 复制代码

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ser=new QTcpServer(this);
}

Widget::~Widget()
{
    delete ui;
}
//启动按钮的槽函数
void Widget::on_staetbtn_clicked()
{
    if(ui->staetbtn->text()=="启动")
    {
        //获取ui界面上的端口号
        quint16 port=ui->portedit->text().toInt();
        //启动服务器
        if(ser->listen(QHostAddress::Any,port)==true)
        {
            QMessageBox::information(this,"成功","服务器启动成功");
        }else
        {
            QMessageBox::information(this,"失败","服务器启动失败");
        }
        connect(ser,&QTcpServer::newConnection,this,&Widget::newConnection_slot);

        //按钮文本更改
        ui->staetbtn->setText("关闭");
    }else
    {
        //关闭服务器
        ser->close();
        //更改按钮文本内容
        ui->staetbtn->setText("启动");
    }
}
//处理newConnection信号的槽函数
void Widget::newConnection_slot()
{
    //获取最新连接的客户端套接字，并将
    QTcpSocket* socket=ser->nextPendingConnection();
    cliList.append(socket);
    connect(socket,&QTcpSocket::readyRead,this,&Widget::readyRead_slot);
}
void Widget::readyRead_slot()
{
    for(int i=0;i<cliList.length();i++)
    {
        if(cliList[i]->state()==QTcpSocket::UnconnectedState)
        {
            cliList.removeAt(i);
        }
    }
    for(int i=0;i<cliList.length();i++)
    {
        if(cliList[i]->bytesAvailable()!=0)
        {
            QByteArray msg= cliList[i]->readAll();
            //将该消息展示到ui界面
            ui->msgwidget->addItem(QString::fromLocal8Bit(msg));
            //将该消息转发给所有客户端
            for(int j=0;j<cliList.length();j++)
            {
                if(i!=j)    //不转发自己
                {
                    cliList[j]->write(msg);
                }
            }
        }
    }
}

客户端

头文件

cpp 复制代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTcpSocket>
#include <QMessageBox>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_connectbtn_clicked();
    void connected_slot();

    void on_sendbtn_clicked();
    void readyRead_slot();
    void disconnectes_slot();

private:
    Ui::Widget *ui;
    QTcpSocket *cli;
    QString user;

};
#endif // WIDGET_H

源文件

cpp 复制代码

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    cli=new QTcpSocket(this);
    //将客户端的connect信号连接到自定义的槽函数
    connect(cli,&QTcpSocket::connected,this,&Widget::connected_slot);
    //客户端收到服务器消息时会自动发射一个readyRead信号
    connect(cli,&QTcpSocket::readyRead,this,&Widget::readyRead_slot);
    //断开信号连接对应的槽函数
    connect(cli,&QTcpSocket::disconnected,this,&Widget::disconnectes_slot);
}
Widget::~Widget()
{
    delete ui;
}
//连接服务器按钮对应得到槽函数
void Widget::on_connectbtn_clicked()
{
    if(ui->connectbtn->text()=="连接服务器")
    {
        user=ui->userEdit->text();
        QString ip=ui->IPEdit->text();
        quint16 port=ui->portEdit->text().toUInt();
        cli->connectToHost(ip,port);
        ui->connectbtn->setText("断开服务器");
    }else
    {
        QString msg=user+"已下线";
        cli->write(msg.toLocal8Bit());
        cli->disconnectFromHost();
        ui->connectbtn->setText("连接服务器");
    }
}
//connected信号的槽函数的实现
void Widget::connected_slot()
{
    QMessageBox::information(this,"连接","连接成功");
}
//信息发送按钮对应的槽函数
void Widget::on_sendbtn_clicked()
{
    //将ui界面上的文本信息获取下来
    QString msg=user+":"+ ui->lineEdit->text();
    //将消息发送给服务器
    cli->write(msg.toLocal8Bit());
    //清空6行编辑器的内容
    ui->lineEdit->clear();
    //将消息放入ui界面中
    QListWidgetItem *item=new QListWidgetItem(msg);
    item->setTextAlignment(Qt::AlignRight);
    ui->msgwidget->addItem(item);
}
//处理readyRead信号对应的槽函数
void Widget::readyRead_slot()
{
    //将客户端套接字中的消息读取出来
    QByteArray msg=cli->readAll();
    //将消息展示到ui界面
    ui->msgwidget->addItem(QString::fromLocal8Bit(msg));
}
//disconnected信号对应的槽函数
void Widget::disconnectes_slot()
{
    QMessageBox::information(this,"断开","断开连接");
}

数据库

头文件

cpp 复制代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlRecord>
#include <QMessageBox>
#include <QSqlQuery>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_addbtn_clicked();

    void on_searchbtn_clicked();

    void on_deletebtn_clicked();

    void on_updataButton_clicked();

private:
    Ui::Widget *ui;
    QSqlDatabase db;
};
#endif // WIDGET_H

源文件

cpp 复制代码

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    if(!db.contains("mydb.db"))
    {
        db=QSqlDatabase::addDatabase("QSQLITE");
        db.setDatabaseName("mydb.db");
    }
    if(!db.open())
    {
        QMessageBox::information(this,"失败","打开失败");
        return;
    }
    QString sql="create table if not exists Stu(numb int,name char,sex char,score double);";
    QSqlQuery query;
    if(!query.exec(sql))
    {
        QMessageBox::information(this,"提示","创建失败");
        return;
    }
}

Widget::~Widget()
{
    delete ui;
}
//添加槽函数
void Widget::on_addbtn_clicked()
{
    int ui_numb=ui->numEdit->text().toUInt();
    QString ui_name=ui->nameedit->text();
    QString ui_sex=ui->sexEdit->text();
    double ui_score=ui->scoreedit->text().toUInt();

    if(ui_sex==NULL||ui_numb==0||ui_name==NULL||ui_score==0)
    {
        QMessageBox::information(this,"提示","请将信息填写完整");
        return;
    }
    QString sql=QString("insert into Stu values(%1,'%2','%3',%4)").arg(ui_numb).arg(ui_name).arg(ui_sex).arg(ui_score);
    QSqlQuery query;
    if(!query.exec(sql))
    {
        QMessageBox::information(this,"提示","添加失败");
        return;
    }else
    {
        QMessageBox::information(this,"提示","添加成功");
         //清空所有行编辑框
        ui->numEdit->clear();
        ui->nameedit->clear();
        ui->sexEdit->clear();
        ui->scoreedit->clear();
        return;
    }

}

//查找槽函数
void Widget::on_searchbtn_clicked()
{
    ui->tableWidget->clearContents();
    QString sql;
    if(ui->nameedit->text()==NULL)
    {
        sql="select *from Stu";
    }else
    {
        sql=QString("select * from Stu where name='%1'").arg(ui->nameedit->text());
    }
     QSqlQuery query;
    if(!query.exec(sql))
    {
        QMessageBox::information(this,"提示","查找失败");
        return;
    }
     //清空所有行编辑框
    ui->numEdit->clear();
    ui->nameedit->clear();
    ui->sexEdit->clear();
    ui->scoreedit->clear();
    int i=0;
    while(query.next())
    {
        for(int j=0;j<query.record().count();j++)
        {
            QTableWidgetItem *item=new QTableWidgetItem(query.record().value(j).toString());
            item->setTextAlignment(Qt::AlignCenter);
            ui->tableWidget->setItem(i,j,item);
        }
        i++;
    }
}
//删除槽函数
void Widget::on_deletebtn_clicked()
{
    QString sql;
    if(ui->nameedit->text()==NULL)
    {
        sql="delete from Stu";
    }else
    {
        sql=QString("delete from Stu where name='%1'").arg(ui->nameedit->text());
    }
     QSqlQuery query;
    if(!query.exec(sql))
    {
        QMessageBox::information(this,"提示","删除失败");
        return;
    }else
    {
        QMessageBox::information(this,"提示","删除成功");
         //清空所有行编辑框
        ui->numEdit->clear();
        ui->nameedit->clear();
        ui->sexEdit->clear();
        ui->scoreedit->clear();
    }
}
//修改槽函数
void Widget::on_updataButton_clicked()
{
     QString sql;
      sql=QString("update Stu set score=%1 where name='%2'").arg(ui->scoreedit->text()).arg(ui->nameedit->text());
      QSqlQuery query;
     if(!query.exec(sql))
     {
         QMessageBox::information(this,"提示","修改失败");
         return;
     }else
     {
         QMessageBox::information(this,"提示","修改成功");
         //清空所有行编辑框
         ui->numEdit->clear();
         ui->nameedit->clear();
         ui->sexEdit->clear();
         ui->scoreedit->clear();
     }
}