利用Qt实现FTP服务器并支持多客户端登录

#ifndef ftpserverwidget_h
#define ftpserverwidget_h

#include <qwidget>
#include <qgridlayout>
#include <qhboxlayout>
#include <qlabel>
#include <qlineedit>
#include <qpushbutton>
#include <qtoolbutton>
#include <qfiledialog>
#include <qregularexpression>
#include <qregularexpressionvalidator>
#include <qmessagebox>
#include <qfileinfo>
#include <qhostinfo>

#include "ftpserver/ftpserver.h"



class ftpserverwidget : public qwidget
{
    q_object
    q_property(qstring ip read get_ip write set_ip)
    q_property(qstring port read get_port write set_port)
    q_property(qstring username read get_user_name write set_user_name)
    q_property(qstring password read get_password write set_password)
    q_property(qstring path read get_path write set_path)
signals:
    void para_changed();
public:
    explicit ftpserverwidget(qwidget *parent = nullptr);
    ~ftpserverwidget();

    bool set_ftp_para(qstring ip,qstring port,qstring username,qstring password,qstring path);

    bool ftp_start_server();
    bool ftp_stop_server();

    qstring get_ip();
    void set_ip(qstring val);
    qstring get_port();
    void set_port(qstring val);
    qstring get_user_name();
    void set_user_name(qstring val);
    qstring get_password();
    void set_password(qstring val);
    qstring get_path();
    void set_path(qstring val);
protected:
    void showevent(qshowevent *event) override;
    void closeevent(qcloseevent *event) override;
private:
    void value_init();
    void control_init();
private slots:
  void btn_click_slot();
  void dir_select_slot(const qstring &directory);

private:
    qgridlayout *gridlayout;
    qhboxlayout *horizontallayout;
    qlabel *label;
    qlineedit *lineeditip;
    qhboxlayout *horizontallayout_2;
    qlabel *label_2;
    qlineedit *lineeditport;
    qhboxlayout *horizontallayout_3;
    qlabel *label_3;
    qlineedit *lineedituser;
    qhboxlayout *horizontallayout_4;
    qlabel *label_4;
    qlineedit *lineeditpassward;
    qhboxlayout *horizontallayout_6;
    qlabel *label_6;
    qlineedit *lineeditpath;
    qpushbutton *btnselectpath;
    qhboxlayout *horizontallayout_7;
    qpushbutton *btncancel;
    qpushbutton *btnconfirm;

    qfiledialog *dirselectdlg;
    qmessagebox *paramessagebox;


    qstring ftpip = nullptr;
    qstring ftpport = nullptr;
    qstring ftpusername = nullptr;
    qstring ftppassword = nullptr;
    qstring ftppath = nullptr;

    ftpserver *ftpserver = nullptr;

};

#endif // ftpserverwidget_h

#include "ftpserverwidget.h"


ftpserverwidget::ftpserverwidget(qwidget *parent)
    : qwidget{parent}
{
    this->value_init();
    this->control_init();
}

ftpserverwidget::~ftpserverwidget()
{
    this->ftp_stop_server();
}


void ftpserverwidget::value_init()
{
    this->ftpip = "127.0.0.1";
}

void ftpserverwidget::control_init()
{
    this->resize(450, 330);
    this->setminimumsize(qsize(450, 330));
    this->setmaximumsize(qsize(500, 380));
    this->setwindowtitle(tr("ftp服务器参数设置"));

    gridlayout = new qgridlayout();
    gridlayout->setobjectname(qstring::fromutf8("gridlayout"));

    horizontallayout = new qhboxlayout();
    horizontallayout->setobjectname(qstring::fromutf8("horizontallayout"));

    label = new qlabel();
    label->settext(tr("服务器ip:"));
    label->setobjectname(qstring::fromutf8("label"));
    label->setalignment(qt::aligncenter);

    horizontallayout->addwidget(label);

    lineeditip = new qlineedit();
    lineeditip->setobjectname(qstring::fromutf8("lineeditip"));

    horizontallayout->addwidget(lineeditip);

    horizontallayout->setstretch(0, 1);
    horizontallayout->setstretch(1, 4);

    gridlayout->addlayout(horizontallayout, 0, 0, 1, 1);

    horizontallayout_2 = new qhboxlayout();
    horizontallayout_2->setobjectname(qstring::fromutf8("horizontallayout_2"));

    label_2 = new qlabel();
    label_2->settext(tr("服务器端口:"));
    label_2->setobjectname(qstring::fromutf8("label_2"));
    label_2->setalignment(qt::aligncenter);

    horizontallayout_2->addwidget(label_2);

    lineeditport = new qlineedit();
    lineeditport->setobjectname(qstring::fromutf8("lineeditport"));

    horizontallayout_2->addwidget(lineeditport);

    horizontallayout_2->setstretch(0, 1);
    horizontallayout_2->setstretch(1, 4);

    gridlayout->addlayout(horizontallayout_2, 1, 0, 1, 1);

    horizontallayout_3 = new qhboxlayout();
    horizontallayout_3->setobjectname(qstring::fromutf8("horizontallayout_3"));

    label_3 = new qlabel();
    label_3->settext(tr("用户名:"));
    label_3->setobjectname(qstring::fromutf8("label_3"));
    label_3->setalignment(qt::aligncenter);

    horizontallayout_3->addwidget(label_3);

    lineedituser = new qlineedit();
    lineedituser->setobjectname(qstring::fromutf8("lineedituser"));

    horizontallayout_3->addwidget(lineedituser);

    horizontallayout_3->setstretch(0, 1);
    horizontallayout_3->setstretch(1, 4);

    gridlayout->addlayout(horizontallayout_3, 2, 0, 1, 1);

    horizontallayout_4 = new qhboxlayout();
    horizontallayout_4->setobjectname(qstring::fromutf8("horizontallayout_4"));

    label_4 = new qlabel();
    label_4->settext(tr("登录密码:"));
    label_4->setobjectname(qstring::fromutf8("label_4"));
    label_4->setalignment(qt::aligncenter);

    horizontallayout_4->addwidget(label_4);

    lineeditpassward = new qlineedit();
    lineeditpassward->setobjectname(qstring::fromutf8("lineeditpassward"));

    horizontallayout_4->addwidget(lineeditpassward);

    horizontallayout_4->setstretch(0, 1);
    horizontallayout_4->setstretch(1, 4);

    gridlayout->addlayout(horizontallayout_4, 3, 0, 1, 1);

    horizontallayout_6 = new qhboxlayout();
    horizontallayout_6->setobjectname(qstring::fromutf8("horizontallayout_6"));

    label_6 = new qlabel();
    label_6->settext(tr("文件路径:"));
    label_6->setobjectname(qstring::fromutf8("label_6"));
    label_6->setalignment(qt::aligncenter);

    horizontallayout_6->addwidget(label_6);

    lineeditpath = new qlineedit();
    lineeditpath->setobjectname(qstring::fromutf8("lineeditpath"));
    qsizepolicy sizepolicy(qsizepolicy::expanding, qsizepolicy::fixed);
    sizepolicy.sethorizontalstretch(0);
    sizepolicy.setverticalstretch(0);
    sizepolicy.setheightforwidth(lineeditpath->sizepolicy().hasheightforwidth());
    lineeditpath->setsizepolicy(sizepolicy);

    horizontallayout_6->addwidget(lineeditpath);

    btnselectpath = new qpushbutton();
    btnselectpath->settext(tr("..."));
    btnselectpath->setobjectname(qstring::fromutf8("toolbtnselectpath"));
    btnselectpath->setminimumsize(qsize(82, 0));

    horizontallayout_6->addwidget(btnselectpath);

    horizontallayout_6->setstretch(0, 1);
    horizontallayout_6->setstretch(1, 3);
    horizontallayout_6->setstretch(2, 1);

    gridlayout->addlayout(horizontallayout_6, 4, 0, 1, 1);

    horizontallayout_7 = new qhboxlayout();
    horizontallayout_7->setobjectname(qstring::fromutf8("horizontallayout_7"));

    btncancel = new qpushbutton();
    btncancel->settext(tr("取消"));
    btncancel->setobjectname(qstring::fromutf8("btncancel"));
    qsizepolicy sizepolicy1(qsizepolicy::minimum, qsizepolicy::fixed);
    sizepolicy1.sethorizontalstretch(0);
    sizepolicy1.setverticalstretch(0);
    sizepolicy1.setheightforwidth(btncancel->sizepolicy().hasheightforwidth());
    btncancel->setsizepolicy(sizepolicy1);
    btncancel->setminimumsize(qsize(0, 50));

    horizontallayout_7->addwidget(btncancel);

    btnconfirm = new qpushbutton();
    btnconfirm->settext(tr("确定"));
    btnconfirm->setobjectname(qstring::fromutf8("btnconfirm"));
    sizepolicy1.setheightforwidth(btnconfirm->sizepolicy().hasheightforwidth());
    btnconfirm->setsizepolicy(sizepolicy1);
    btnconfirm->setminimumsize(qsize(0, 50));

    horizontallayout_7->addwidget(btnconfirm);


    gridlayout->addlayout(horizontallayout_7, 5, 0, 1, 1);

    this->setlayout(gridlayout);
    //限制lineedit格式输入
    qregularexpression regipstr("(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])\\.(\\d{1,2}|1\\d\\d|2[0-4]\\d|25[0-5])");
    qvalidator * validator = new qregularexpressionvalidator(regipstr, this->lineeditip);
    this->lineeditip->setvalidator(validator);

    this->lineeditport->setvalidator(new qintvalidator(0,65535,this->lineeditport));


    qregularexpression reguserstr("[a-za-z0-9]+$");
    validator = new qregularexpressionvalidator(reguserstr, this->lineedituser);
    this->lineedituser->setvalidator(validator);
    this->lineeditpassward->setvalidator(validator);
    this->lineedituser->setmaxlength(8);
    this->lineeditpassward->setmaxlength(8);

    this->lineeditip->setplaceholdertext(tr("请输入服务器ip地址！"));
    this->lineeditport->setplaceholdertext(tr("请输入服务器端口！"));
    this->lineedituser->setplaceholdertext(tr("请输入登录用户名！"));
    this->lineeditpassward->setplaceholdertext(tr("请输入登录密码！"));
    this->lineeditpath->setplaceholdertext(tr("请输入文件路径！"));

    this->lineeditip->setstylesheet("border:2px groove gray;border-radius:8px;padding:2px 4px;border-style: outset;");
    this->lineeditport->setstylesheet("border:2px groove gray;border-radius:8px;padding:2px 4px;border-style: outset;");
    this->lineedituser->setstylesheet("border:2px groove gray;border-radius:8px;padding:2px 4px;border-style: outset;");
    this->lineeditpassward->setstylesheet("border:2px groove gray;border-radius:8px;padding:2px 4px;border-style: outset;");
    this->lineeditpath->setstylesheet("border:2px groove gray;border-radius:8px;padding:2px 4px;border-style: outset;");

    this->lineeditip->setreadonly(true);


    //路径选择dialog初始化
    this->dirselectdlg = new qfiledialog(this);
    this->dirselectdlg->setfilemode(qfiledialog::directory);
    this->dirselectdlg->setwindowtitle(tr("请选择一个文件夹！"));
    this->dirselectdlg->setmodal(false);
    this->dirselectdlg->close();
    connect(this->dirselectdlg,&qfiledialog::fileselected,this,&ftpserverwidget::dir_select_slot);
    //错误提示messagebox初始化
    this->paramessagebox = new qmessagebox(this);
    this->paramessagebox->setmodal(false);
    this->paramessagebox->setwindowtitle(tr("参数错误！"));
    this->paramessagebox->seticon(qmessagebox::warning);
    this->paramessagebox->setminimumsize(500,100);
    this->paramessagebox->close();


    connect(this->btnconfirm,&qpushbutton::clicked,this,&ftpserverwidget::btn_click_slot);
    connect(this->btncancel,&qpushbutton::clicked,this,&ftpserverwidget::btn_click_slot);
    connect(this->btnselectpath,&qpushbutton::clicked,this,&ftpserverwidget::btn_click_slot);

}
bool ftpserverwidget::set_ftp_para(qstring ip, qstring port, qstring username, qstring password, qstring path)
{

    qdebug()<<"ip:"<<ip<<"  port:"<<port<<"  username:"<<username<<"  password:"<<password<<"  path:"<<path;
    if(ip == nullptr)
    {
        this->paramessagebox->settext(tr("ip不能为空！"));
        this->paramessagebox->show();
        return false;
    }
    if(port == nullptr)
    {
        this->paramessagebox->settext(tr("端口设置不能为空！"));
        this->paramessagebox->show();
        return false;
    }
    if(port.touint() >65535)
    {
        this->paramessagebox->settext(tr("端口值设置错误！"));
        this->paramessagebox->show();
        return false;
    }
    if(username == nullptr)
    {
        this->paramessagebox->settext(tr("用户名不能为空！"));
        this->paramessagebox->show();
        return false;
    }
    if(password == nullptr)
    {
        this->paramessagebox->settext(tr("用户密码不能为空！"));
        this->paramessagebox->show();
        return false;
    }
    if(path == nullptr)
    {
        this->paramessagebox->settext(tr("路径不能为空！"));
        this->paramessagebox->show();
        return false;
    }
    qfileinfo info(path);
    if(!info.exists())
    {
        this->paramessagebox->settext(tr("路径不存在！"));
        this->paramessagebox->show();
        return false;
    }


    this->ftpip = ip;
    this->ftpport = port;
    this->ftpusername = username;
    this->ftppassword = password;
    this->ftppath = path;
    return true;
}

bool ftpserverwidget::ftp_start_server()
{
    if(this->ftpip == nullptr)
    {
        return false;
    }
    if(this->ftpport == nullptr)
    {
        return false;
    }
    if(this->ftpport.touint() >65535)
    {
        return false;
    }
    if(this->ftpusername == nullptr)
    {
        return false;
    }
    if(this->ftppassword == nullptr)
    {
        return false;
    }
    if(this->ftppath == nullptr)
    {
        return false;
    }
    qfileinfo info(this->ftppath);
    if(!info.exists())
    {
        return false;
    }

    if (this->ftpserver !=nullptr)
    {
        qdebug() << "服务器已经启动";
        return true;
    }
    this->ftpserver = new ftpserver(this, this->ftppath, this->ftpport.toint(), this->ftpusername, this->ftppassword);
    //connect(m_server, signal(newpeerip(qstring)), this, slot(onnewpeerip(qstring)));

    qdebug() << "服务器已启动";
    return true;
}
bool ftpserverwidget::ftp_stop_server()
{
    if(this->ftpserver != nullptr)
    {
        delete this->ftpserver;
        this->ftpserver = null;
    }
    qdebug() << "服务器已关闭";
    return true;
}

qstring ftpserverwidget::get_ip()
{
    return this->ftpip;
}

void ftpserverwidget::set_ip(qstring val)
{
    this->ftpip = val;
    emit para_changed();
}

qstring ftpserverwidget::get_port()
{
     return this->ftpport;
}

void ftpserverwidget::set_port(qstring val)
{
    this->ftpport = val;
    emit para_changed();

}

qstring ftpserverwidget::get_user_name()
{
    return this->ftpusername;
}

void ftpserverwidget::set_user_name(qstring val)
{
    this->ftpusername = val;
    emit para_changed();
}

qstring ftpserverwidget::get_password()
{
    return this->ftppassword;
}

void ftpserverwidget::set_password(qstring val)
{
    this->ftppassword = val;
    emit para_changed();
}

qstring ftpserverwidget::get_path()
{
    return this->ftppath;
}

void ftpserverwidget::set_path(qstring val)
{
    this->ftppath = val;
    emit para_changed();
}



void ftpserverwidget::btn_click_slot()
{
    qpushbutton *btn = qobject_cast<qpushbutton *>(sender());
    if(btn == this->btnconfirm) //确定
    {
        qstring ipstr = this->lineeditip->text();
        qstring portstr = this->lineeditport->text();
        qstring userstr = this->lineedituser->text();
        qstring passwordstr = this->lineeditpassward->text();
        qstring pathstr = this->lineeditpath->text();


        this->set_ftp_para(ipstr,portstr,userstr,passwordstr,pathstr);
        this->ftp_start_server();
    }
    else if(btn == this->btncancel) //取消
    {
        this->close();
    }
    else if(btn == this->btnselectpath) //选择路径
    {
        this->dirselectdlg->show();
    }
}

void ftpserverwidget::dir_select_slot(const qstring &directory)
{
    this->lineeditpath->settext(directory);
}
void ftpserverwidget::showevent(qshowevent *event)
{
    q_unused(event);
    if(this->ftpip != nullptr)
    {
        this->lineeditip->settext(this->ftpip);
    }
    if(this->ftpport != nullptr)
    {
        this->lineeditport->settext(this->ftpport);
    }
    if(this->ftpusername !=nullptr)
    {
        this->lineedituser->settext(this->ftpusername);
    }
    if(this->ftppassword != nullptr)
    {
        this->lineeditpassward->settext(this->ftppassword);
    }
    if(this->ftppath != nullptr)
    {
        this->lineeditpath->settext(this->ftppath);
    }

}
void ftpserverwidget::closeevent(qcloseevent *event)
{
    q_unused(event);
    this->dirselectdlg->close();
    this->paramessagebox->close();
}