Qt 科目一考试系统（有源码）

项目源码和资源：科目一考试系统: qt实现科目一考试系统

一.项目概述

该项目是一个基于Qt框架开发的在线考试系统，主要实现了考试题目的随机抽取、考试时间限制、成绩统计等功能。用户可以通过界面操作进行考试，并查看自己的考试成绩。

二.技术栈

Qt框架、C++语言、GUI设计、数据结构、算法等。

三.界面展示

1.登录界面

2.答题界面

3.提交界面

四.代码展示

1.核心要点

整体项目共分为两个部分，登录界面和答题界面，登录界面使用的qt设计器进行手动设计，登录界面核心的点在于使用正则表达式对已有账号进行分析，答题界面核心则是对文件中的试题进行处理。

2.登录界面代码

#ifndef LOGINDIALOG_H
#define LOGINDIALOG_H

#include <QDialog>

QT_BEGIN_NAMESPACE
namespace Ui { class LoginDialog; }
QT_END_NAMESPACE

class LoginDialog : public QDialog
{
    Q_OBJECT

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

private slots:
    void on_pushButtonOk_clicked();

    void on_pushButtonCancel_clicked();

private:
    Ui::LoginDialog *ui;

private:
    void InitUI();
};
#endif // LOGINDIALOG_H

#include "logindialog.h"
#include "ui_logindialog.h"
#include<QIcon>
#include<QMessageBox>
#include<QFile>
#include<QTextStream>

LoginDialog::LoginDialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::LoginDialog)
{
    ui->setupUi(this);
    InitUI();
}

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

void LoginDialog::InitUI()
{
    //设置窗口大小
    int wide=ui->labelimage->width();
    int height=ui->labelimage->height();
    this->setGeometry(600,300,wide,height);
    this->setWindowTitle("科目一考试系统");

    this->setWindowFlags(Qt::Dialog|Qt::WindowTitleHint);

}


void LoginDialog::on_pushButtonOk_clicked()
{
    
        QRegExp rx("^[a-zA-Z][\\w]{5,17}@([A-Za-z0-9\\-]+\\.)+[A-Za-z]{2,6}$");

        bool res = rx.exactMatch(ui->lineEditaccount->text());
        if(!res){//匹配不成功
            QMessageBox::information(this,"提示","非法的邮箱地址，请你重新输入！");
            ui->lineEditaccount->clear();
            ui->lineEditpassword->clear();
            ui->lineEditaccount->setFocus();//设置光标
            return;
        }
        else{

            //匹配成功了
            QString filename;   //账号密码数据文件
            QString strAccInput;//用户输入的账号
            QString strCode;    //用户输入的密码
            QString strLine;    //每次读取的一行数据
            QStringList strList;//保存分割读取的一行数据

            filename = "account.txt";//发布时要进行修改
            strAccInput = ui->lineEditaccount->text();//账号
            strCode = ui->lineEditpassword->text();//密码

            QFile file(filename);
            QTextStream stream(&file);
            if( file.open(QIODevice::ReadOnly | QIODevice::Text) )
            {
                while(!stream.atEnd()){
                strLine = stream.readLine();
                strList = strLine.split(",");
                if(strAccInput == strList.at(0))//账号匹配成功
                {
                    if(strCode == strList.at(1)){//密码匹配成功
                        QMessageBox::information(this,"提示","欢迎进入科目一考试系统！");
                        file.close();
                        done(Accepted);
                        return;
                    }else{
                        QMessageBox::information(this,"提示","您输入的密码有误，请重新输入！");
                        ui->lineEditpassword->clear();
                        ui->lineEditpassword->setFocus();
                        file.close();
                        return;
                    }
                }

                QMessageBox::information(this,"提示","您输入的账号有误，请重新输入！");
                ui->lineEditaccount->clear();
                ui->lineEditpassword->clear();
                ui->lineEditaccount->setFocus();
                file.close();
                return;
               }
            }else{
                QMessageBox::information(this,"提示","读取账号数据文件失败！");
                return;
            }
        }

}

void LoginDialog::on_pushButtonCancel_clicked()
{
    //关闭窗口
    this->close();
}

3.答题界面代码

#ifndef EXAMDIALOG_H
#define EXAMDIALOG_H
#include <QDialog>
#include <QTimer>
#include <QTextEdit>
#include <QLabel>
#include <QRadioButton>
#include <QCheckBox>
#include <QGridLayout>
#include <QButtonGroup>

class ExamDialog : public QDialog
{
    Q_OBJECT
public:
    ExamDialog(QWidget* parent = 0);
    void initTimer();   //初始化计时器
    void initLayout();  //初始化布局管理器
    bool initTextEdit();//初始化文本编辑器
    void initButtons(); //初始化按钮及标签
    bool hasNoSelect(); //判断题目是否有未完成的
private:
    QTimer *m_timer;    //计时器
    int m_timeGo;       //考试已用时

    QTextEdit *m_textEdit;  //考试题库显示
    QLabel *m_titleLabels[10];  //题目标签
    QButtonGroup *m_btnGroups[9];   //单项按钮分组
    QRadioButton *m_radioBtns[32];  //单选题按钮
    QCheckBox *m_checkBtns[4];      //多选题按钮
    QRadioButton *m_radioA;         //判断题A选项
    QRadioButton *m_radioB;         //判断题B选项
    QGridLayout *m_layout;          //布局管理器
    QStringList m_answerList;       //答案

private slots:
    void freshTime();   //刷新考试时间
    void getScore();    //获取考试成绩
};

#endif // EXAMDIALOG_H

#include "examdialog.h"
#include <QFile>
#include <QTextStream>
#include <QMessageBox>
#include <QApplication>
#include <QPushButton>

ExamDialog::ExamDialog(QWidget* parent):QDialog(parent)
{
    //设置字体大小
    QFont font;
    font.setPointSize(12);
    setFont(font);

    //设置窗体背景颜色
    setPalette(QPalette(QColor(209,215,255)));

    setWindowTitle("考试已用时：0分0秒");
    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);
    resize(800,900);

    initTimer();
    initLayout();
    if(!initTextEdit()){
        QMessageBox::information(this,"提示","初始化题库数据文件失败！");
        QTimer::singleShot(0,qApp,SLOT(quit()));
    }

    initButtons();
    show();
}

void ExamDialog::initTimer()
{
    m_timeGo = 0;
    m_timer = new QTimer(this);
    m_timer->setInterval(1000);
    m_timer->start();

    connect(m_timer,SIGNAL(timeout()),this,SLOT(freshTime()));
}

void ExamDialog::initLayout()
{
    m_layout = new QGridLayout(this);
    m_layout->setSpacing(10);   //设置控件间的间距
    m_layout->setMargin(10);    //设置窗体与控件间的间隙
}

bool ExamDialog::initTextEdit()
{
    QString strLine;        //保存文件中读取到的一行数据
    QStringList strList;    //保存读取到的答案行
    QString fileName("exam.txt");
    QFile file(fileName);
    QTextStream stream(&file);
    stream.setCodec("UTF-8");

    if( file.open(QIODevice::ReadOnly | QIODevice::Text) )
    {
        m_textEdit = new QTextEdit(this);
        m_textEdit->setReadOnly(true);

        QString strText;    //用于保存显示到文本编辑器的数据
        int nLines = 0;
        while(!stream.atEnd()){

            //过滤首行
            if(nLines == 0){
                stream.readLine();
                nLines++;
                continue;
            }

            //过滤答案行
            if( (nLines >= 6 && nLines <= 6 * 9 && (nLines % 6 == 0) )
               || (nLines == 6 * 9 + 4) ){
                strLine = stream.readLine();
                strList = strLine.split(" ");
                m_answerList.append(strList.at(1));
                strText += "\n";
                nLines++;
                continue;
            }

            strText += stream.readLine();
            strText += "\n";
            nLines++;
        }
        m_textEdit->setText(strText);
        m_layout->addWidget(m_textEdit,0,0,1,10);
        file.close();
        return true;
    }else{
        return false;
    }
}

void ExamDialog::initButtons()
{
    QStringList strList = {"A","B","C","D"};
    for(int i = 0; i <10; i++){

        //题目标签
        m_titleLabels[i] = new QLabel(this);
        m_titleLabels[i]->setText("第" + QString::number(i+1) + "题");
        m_layout->addWidget(m_titleLabels[i],1,i);

        //判断题
        if(i == 9){
            m_radioA = new QRadioButton(this);
            m_radioB = new QRadioButton(this);

            m_radioA->setText("正确");
            m_radioB->setText("错误");

            m_layout->addWidget(m_radioA,2,9);
            m_layout->addWidget(m_radioB,3,9);

            m_btnGroups[8] = new QButtonGroup(this);
            m_btnGroups[8]->addButton(m_radioA);
            m_btnGroups[8]->addButton(m_radioB);
            break;
        }

        if(i < 8) m_btnGroups[i] = new QButtonGroup(this);

        //选择题
        for(int j = 0; j < 4; j++)
        {
            if( i == 8){//多项多选题
                m_checkBtns[j] = new QCheckBox(this);
                m_checkBtns[j]->setText(strList.at(j));
                m_layout->addWidget(m_checkBtns[j],2+j,8);
            }else{//单项选择题
                m_radioBtns[4 * i + j] = new QRadioButton(this);
                m_radioBtns[4 * i + j]->setText(strList.at(j));
                m_layout->addWidget(m_radioBtns[4 * i + j],2+j,i);

                m_btnGroups[i]->addButton(m_radioBtns[4 * i + j]);
            }
        }
    }

    QPushButton *submitBtn = new QPushButton(this);
    submitBtn->setText("提交");
    submitBtn->setFixedSize(100,35);
    connect(submitBtn,SIGNAL(clicked(bool)),this,SLOT(getScore()));
    m_layout->addWidget(submitBtn,6,9);
}

bool ExamDialog::hasNoSelect()
{
    int radioSelects = 0;
    for(int i = 0; i < 8; i++)
    {
        if( m_btnGroups[i]->checkedButton() )
            radioSelects++;
    }

    if(radioSelects != 8)
        return true;

    int checkSelects = 0;
    for(int i = 0; i < 4; i++)
    {
        if(m_checkBtns[i]->isChecked())
            checkSelects++;
    }

    if(checkSelects == 0 || checkSelects == 1)
        return true;

    if(!m_radioA->isChecked() && !m_radioB->isChecked())
        return true;

    return false;
}

void ExamDialog::freshTime()
{
    m_timeGo++;
    QString min = QString::number(m_timeGo / 60);
    QString sec = QString::number(m_timeGo % 60);
    setWindowTitle("考试已用时：" + min + "分" + sec + "秒");
}

void ExamDialog::getScore()
{
    if(hasNoSelect()){
        QMessageBox::information(this,"提示","您有未完成的题目，请完成考试！","是");
        return;
    }

    int scores = 0;
    for(int i = 0; i < 10; i++)
    {
        //单选题计分
        if( i < 8)
            if(m_btnGroups[i]->checkedButton()->text() == m_answerList.at(i))
                scores += 10;

        //多项选择题计分
        if(i == 8){
            QString answer = m_answerList.at(i);
            bool hasA = false;
            bool hasB = false;
            bool hasC = false;
            bool hasD = false;

            if( answer.contains("A") ) hasA = true;
            if( answer.contains("B") ) hasB = true;
            if( answer.contains("C") ) hasC = true;
            if( answer.contains("D") ) hasD = true;

            bool checkA = m_checkBtns[0]->checkState();
            bool checkB = m_checkBtns[1]->checkState();
            bool checkC = m_checkBtns[2]->checkState();
            bool checkD = m_checkBtns[3]->checkState();

            if( hasA != checkA) continue;
            if( hasB != checkB) continue;
            if( hasC != checkC) continue;
            if( hasD != checkD) continue;

            scores += 10;
        }

        //判断题计分
        if(i == 9){
            if(m_btnGroups[8]->checkedButton()->text() == m_answerList.at(i))
                scores += 10;
        }
    }

    QString str = "您的分数是：" + QString::number(scores) + "分，是否重新考试？";
    int res = QMessageBox::information(this,"提示",str,QMessageBox::Yes | QMessageBox::No);
    if(res == QMessageBox::Yes)
        return;
    else
        close();
}