Qt 登录界面设计

程序简介：

创建一个用户注册界面，用户输入注册信息后，点击“注册”按钮，将用户信息写入文件，并弹出对话框显示“xxx用户，您好！恭喜您已经注册成功。”
写入文件的用户信息
用户名、姓名、邮箱、性别、出生日期、注册日期时间、个人爱好等
要求：注册用户名必须唯一，如有重复则注册不成功，程序应给出提示；邮箱检查合法性；性别要求选择；出生日期从下拉菜单或日历中选择；注册日期时间为系统时间；个人爱好从列表中多选
在此基础上，我实现了运行程序时弹出一个登陆框， 点击注册弹出一个注册框， 点击登陆显示当前用户信息的功能，使用了背景透明和无边框的设计，使用了Unix风格的配置文件格式，采用了Md5加密密码，用了国际正则表达式限制邮箱格式，并且对所有输入框都进行了一定的限制，保证了程序的稳定

效果图：

使用代码前注意：配置文件应该放在Debug文件下，名字为pw.txt，当然可以自己更改路径，重新命名

代码：

main.cpp:

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

mainwindow.h:

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include "dialog.h"class mainwindow : public QDialog{    Q_OBJECTpublic:    explicit mainwindow(QWidget *parent = 0);protected:    void paintEvent(QPaintEvent *event);private:    QLabel label1, label2;    QLineEdit lineedit1, lineedit2;    QPushButton button1, button2, button3;    QByteArray m_passwdhash;    QString m_usrname, m_passwd;private slots:    void on_Register_clicked();    void on_Login_clicked();    void on_Exit_clicked();};#endif // MAINWINDOW_H

mainwindow.cpp:

#include "mainwindow.h"mainwindow::mainwindow(QWidget *parent) : QDialog(parent) {    //设置窗口样式    setAttribute(Qt::WA_TranslucentBackground, true);    setWindowFlags(Qt::FramelessWindowHint);    setGeometry(QRect(750, 300, 400, 400));    //设置密码显示样式    lineedit2.setEchoMode(QLineEdit::Password);    label1.setText(tr("Username"));    label2.setText("Passwd     ");    button1.setText("regist");    button2.setText("login");    button3.setText("exit");    QPalette palette;    palette.setColor(QPalette::WindowText, Qt::blue);    label1.setPalette(palette);    label2.setPalette(palette);    QHBoxLayout *hboxlayout1 = new QHBoxLayout;    QHBoxLayout *hboxlayout2 = new QHBoxLayout;    QHBoxLayout *hboxlayout3 = new QHBoxLayout;    hboxlayout1->addWidget(&label1);    hboxlayout1->addWidget(&lineedit1);    hboxlayout2->addWidget(&label2);    hboxlayout2->addWidget(&lineedit2);    hboxlayout3->addWidget(&button1);    hboxlayout3->addWidget(&button2);    hboxlayout3->addWidget(&button3);    QVBoxLayout *vboxlayout = new QVBoxLayout;    vboxlayout->addLayout(hboxlayout1);    vboxlayout->addLayout(hboxlayout2);    vboxlayout->addLayout(hboxlayout3);    setLayout(vboxlayout);    connect(&button1, SIGNAL(clicked()), this, SLOT(on_Register_clicked()));    connect(&button2, SIGNAL(clicked()), this, SLOT(on_Login_clicked()));    connect(&button3, SIGNAL(clicked()), this, SLOT(on_Exit_clicked()));}void mainwindow::paintEvent(QPaintEvent *event) {    Q_UNUSED(event);    QPainter painter(this);    painter.fillRect(this->rect(), QColor(0, 0, 255, 80));}void mainwindow::on_Register_clicked(){    Dialog w;    w.show();    w.exec();}void mainwindow::on_Login_clicked(){    //检验用户名或密码是否为空    if (lineedit1.text().isEmpty() || lineedit2.text().isEmpty()) {        QMessageBox::warning(this, tr("warning"), tr("username or password is empty, you can`t login!")); return;    }    m_usrname = lineedit1.text();    m_passwdhash = QCryptographicHash::hash(lineedit2.text().toUtf8(), QCryptographicHash::Md5);    m_passwd = m_passwdhash.toHex();    QFile file("pw.txt");    QTextStream filestream(&file);    //读取文件进行校准    if (!file.open(QIODevice::ReadOnly)) {        QMessageBox::warning(this, tr("warning"), tr("open file fail!") + file.errorString()); return;    }    while (!filestream.atEnd()) {        QByteArray temp;        filestream >> temp;        temp.trimmed();        if (temp.isEmpty()) {            filestream.skipWhiteSpace(); continue;        }        if (temp.startsWith('#')) {            filestream.readLine();  continue;        }        QList<QByteArray> list = temp.split('=');        if (list.count() < 2) {            QMessageBox::warning(this, tr("warning"), tr("user file error!")); return;        }        QString str1 = QString::fromLocal8Bit(list[0].trimmed());        QString str2 = QString::fromLocal8Bit(list[1].trimmed());        if (str1 == "username" && str2 == m_usrname) {            QString strMsg;            strMsg += (str1 + ": " + str2 + "\n");            while (!filestream.atEnd()) {                QByteArray t;                filestream >> t;                t.trimmed();                if (t.isEmpty() || t.startsWith('#')) break;                QList<QByteArray> l = t.split('=');                if (l.count() < 2) {                    QMessageBox::warning(this, tr("warning"), tr("user file error!")); return;                }                QString s1 = QString::fromLocal8Bit(l[0].trimmed());                QString s2 = QString::fromLocal8Bit(l[1].trimmed());                if (s1 == "password" && s2 != m_passwd) {                    QMessageBox::warning(this, tr("user message"), tr("password false!")); return;                }                strMsg += (s1 + ": " + s2 + "\n");            }            QMessageBox::information(this, tr("user message"), strMsg);            return;        }    }    QMessageBox::warning(this, tr("warning"), tr("username error"));    file.close();}void mainwindow::on_Exit_clicked(){    this->close();}

dialog.h:

#ifndef DIALOG_H#define DIALOG_H#include <QtWidgets>#include <QDialog>namespace Ui {class Dialog;}class Dialog : public QDialog{    Q_OBJECTpublic:    explicit Dialog(QWidget *parent = 0);    ~Dialog();private:    Ui::Dialog *ui;    QByteArray m_passwdhash;    QString m_usrname, m_passwd;protected:    void paintEvent(QPaintEvent *event);private slots:    void on_Register_clicked();    void on_Exit_clicked();};#endif // DIALOG_H

dialog.cpp:

#include "dialog.h"#include "ui_dialog.h"Dialog::Dialog(QWidget *parent) :    QDialog(parent),    ui(new Ui::Dialog){    ui->setupUi(this);    //设置窗口样式    setAttribute(Qt::WA_TranslucentBackground, true);    setWindowFlags(Qt::FramelessWindowHint);    setGeometry(QRect(650, 200, 500, 500));    //设置密码显示样式    ui->Passwd->setEchoMode(QLineEdit::PasswordEchoOnEdit);    ui->Passwd_r->setEchoMode(QLineEdit::Password);    //设置邮箱正则表达式    QRegExp re("^[a-z0-9]+([._\\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$");    QRegExpValidator *reVali = new QRegExpValidator(re);    ui->Email->setValidator(reVali);    //设置lineedit的最大输入长度    ui->Usrname->setMaxLength(10);    ui->Passwd->setMaxLength(16);    ui->Passwd_r->setMaxLength(16);    ui->Email->setMaxLength(30);    ui->Name->setMaxLength(20);    //弹出日历    ui->Age->setCalendarPopup(true);}Dialog::~Dialog(){    delete ui;}void Dialog::paintEvent(QPaintEvent *event) {    Q_UNUSED(event);    QPainter painter(this);    painter.fillRect(this->rect(), QColor(0, 0, 255, 80));}void Dialog::on_Register_clicked(){    //检查信息是否完善    if (ui->Usrname->text().isEmpty() || ui->Passwd->text().isEmpty() || ui->Passwd_r->text().isEmpty()            || ui->Name->text().isEmpty() || (!ui->Boy->isChecked() && !ui->Girl->isChecked()) || (!ui->C->isChecked() && !ui->Java->isChecked() && !ui->Python->isChecked())) {        QMessageBox::warning(this, tr("warning"), tr("you must improve your information!")); return;    }    //检查两次密码是否一致    if (ui->Passwd->text() != ui->Passwd_r->text()) {        QMessageBox::warning(this, tr("warning"), tr("two passwds are different!")); return;    }    m_usrname = ui->Usrname->text();    m_passwdhash = QCryptographicHash::hash(ui->Passwd->text().toUtf8(), QCryptographicHash::Md5);    m_passwd = m_passwdhash.toHex();    QString m_email = ui->Email->text();    QString m_name = ui->Name->text().toUtf8();    QString m_sex;    if (ui->Boy->isChecked()) m_sex = "boy";    else m_sex = "girl";    QDate data = ui->Age->date();    QString m_age = data.toString("yyyy-MM-dd");    QString m_hobby;    if (ui->C->isChecked()) m_hobby += "CorC++";    if (ui->Java->isChecked()) {        if (!m_hobby.isEmpty()) m_hobby += "&";        m_hobby += "Java";    }    if (ui->Python->isChecked()) {        if (!m_hobby.isEmpty()) m_hobby += "&";        m_hobby += "Python";    }    QDateTime time = QDateTime::currentDateTime();    QString m_registtime = time.toString("yyyy-MM-dd hh:mm:ss ddd");    QFile file("pw.txt");    QTextStream filestream(&file);    QFile filex("pw.txt");    QTextStream filestreamx(&filex);    //邮箱检验    int flag = 0;    for (int i = 0; i <m_email.size(); i++) {        if (m_email[i] == '@' || m_email[i] == '.') flag++;    }    if (flag < 2 || m_email[m_email.size() - 1] == '.') {        QMessageBox::warning(this, tr("warning"), tr("email adress error!")); return;    }    //检验用户名格式    for (int i = 0; i < m_usrname.size(); i++) {        if (m_usrname[i] == ' ' || m_usrname[i] == '\r' || m_usrname[i] == '\n') {            QMessageBox::warning(this, tr("warning"), tr("username format error!")); return;        }    }    //检验密码格式    for (int i = 0; i < m_passwd.size(); i++) {        if (m_passwd[i] == ' ' || m_passwd[i] == '\r' || m_passwd[i] == '\n') {            QMessageBox::warning(this, tr("warning"), tr("password format error!")); return;        }    }    //检验名字格式    for (int i = 0; i < m_name.size(); i++) {        if (m_name[i] == ' ' || m_name[i] == '\r' || m_name[i] == '\n') {            QMessageBox::warning(this, tr("warning"), tr("name format error!")); return;        }    }    //从用户文档里读取用户信息进行核对    if (!file.open(QIODevice::ReadOnly)) {        QMessageBox::warning(this, tr("warning"), tr("open file fail!") + file.errorString()); return;    }    while (!filestream.atEnd()) {        QByteArray temp;        filestream >> temp;        temp.trimmed();        if (temp.isEmpty()) {            filestream.skipWhiteSpace(); continue;        }        if (temp.startsWith('#')) {            filestream.readLine();  continue;        }        QList<QByteArray> list = temp.split('=');        if (list.count() < 2) {            QMessageBox::warning(this, tr("warning"), tr("user file error!")); return;        }        QString str1 = QString::fromLocal8Bit(list[0].trimmed());        QString str2 = QString::fromLocal8Bit(list[1].trimmed());        if (str1 == "username" && str2 == m_usrname) {            QMessageBox::warning(this, tr("warning"), tr("username has been existed!")); return;        }    }    file.close();    //写入用户文档    if (!filex.open(QIODevice::WriteOnly | QIODevice::Append)) {        QMessageBox::warning(this, tr("warning"), tr("open file fail!") + filex.errorString()); return;    }    QMessageBox::information(this, tr("user message"), tr("regist success!"));    filestreamx << "#" + m_registtime << endl;    filestreamx << "username="  + m_usrname << endl;    filestreamx << "password=" + m_passwd << endl;    filestreamx << "email="  + m_email << endl;    filestreamx << "name=" + m_name << endl;    filestreamx << "sex=" + m_sex << endl;    filestreamx << "age=" + m_age << endl;    filestreamx << "hobby=" + m_hobby << endl;    file.close();    this->close();}void Dialog::on_Exit_clicked(){    this->close();}