一、需求：
1.简单的配置ftp参数界面
2.tcp 客户端端，接收服务器下发的参数信息
3.用户上传操作界面
在这里插入代码片
二、源码`#-------------------------------------------------

#-------------------------------------------------
#
# Project created by QtCreator 2021-06-24T15:49:34
#
#-------------------------------------------------

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = FtpFileShareTool
TEMPLATE = app


SOURCES += main.cpp\
        FtpFileTool.cpp \
    DialogFTPSetting.cpp

HEADERS  += FtpFileTool.h \
    DialogFTPSetting.h

FORMS    += FtpFileTool.ui \
    DialogFTPSetting.ui

// 主操作界面
#ifndef FTPFILETOOL_H
#define FTPFILETOOL_H

#include <QWidget>
#include <QString>
#include <QUrl>
#include <QFile>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include "DialogFTPSetting.h"

namespace Ui {
class FtpFileTool;
}

class FtpFileTool : public QWidget
{
    Q_OBJECT

public:
    explicit FtpFileTool(QWidget *parent = 0);
    ~FtpFileTool();

    // 上传文件
    void put(const QString &fileName, const QString &path);

private slots:
    void slot_put();
    void slot_applyNewConfig();
    void slot_uploadProgress(qint64 bytesSent, qint64 bytesTotal);   // 更新上传进度
    void slot_error(QNetworkReply::NetworkError code);
    void slot_replyFinished(QNetworkReply*);

private:
    Ui::FtpFileTool *ui;
    DialogFTPSetting m_dlgFtpSetting;

    QUrl m_pUrl;        // 远程 ftp url 地址
    QFile m_file;
    QNetworkAccessManager *m_manager;
    QNetworkReply *m_pReply;
    QFile *m_pFile;
};

#endif // FTPFILETOOL_H

#include "FtpFileTool.h"
#include "ui_FtpFileTool.h"
#include <QMessageBox>

FtpFileTool::FtpFileTool(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::FtpFileTool)
{
    ui->setupUi(this);
    connect(ui->pushButtonFTPSetting, &QPushButton::clicked, &m_dlgFtpSetting, &DialogFTPSetting::exec);

    m_pUrl.setScheme("ftp");

    m_manager = new QNetworkAccessManager(this);

    connect(&m_dlgFtpSetting, &DialogFTPSetting::sig_ftpConfigChanged, this, &FtpFileTool::slot_applyNewConfig);

    connect(ui->pushButtonPut, &QPushButton::clicked, this, &FtpFileTool::slot_put);

    connect(ui->lineEditRemotePath, &QLineEdit::textChanged, &m_dlgFtpSetting, &DialogFTPSetting::slot_setNewRemoteConfig);

    connect(m_manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(slot_replyFinished(QNetworkReply*)));
}

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

void FtpFileTool::slot_put()
{
    m_pFile = new QFile(ui->lineEditLocalPath->text());
    qDebug() <<"src file : "<< ui->lineEditLocalPath->text().toLatin1();
    if(false == m_pFile->open(QIODevice::ReadOnly))
    {
        QMessageBox messageBox(this);
        messageBox.setWindowTitle("erro");
        messageBox.setText("open file error");
        messageBox.exec();
    }
    else
    {
        QByteArray data = m_pFile->readAll();
        m_pUrl.setPath(ui->lineEditRemotePath->text());
        m_manager->setNetworkAccessible(QNetworkAccessManager::Accessible);
        m_pReply = m_manager->put(QNetworkRequest(m_pUrl), data);
        qDebug() << "文件内容:" << data;
        connect(m_pReply, &QNetworkReply::uploadProgress, this, &FtpFileTool::slot_uploadProgress);
        connect(m_pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(slot_error(QNetworkReply::NetworkError)));
        if (m_pReply->error() != QNetworkReply::NoError)
        {
            qDebug() << "Error: " << m_pReply->errorString();
        }
        m_pFile->close();
    }
}

void FtpFileTool::slot_applyNewConfig()
{    
    m_pUrl.setHost(m_dlgFtpSetting.getRemoteIP());
    m_pUrl.setPort(21);
    m_pUrl.setUserName(m_dlgFtpSetting.getUserName());
    m_pUrl.setPassword(m_dlgFtpSetting.getPassword());

    if (m_dlgFtpSetting.getRemotePathSetting()!= "" )
    {
        m_pUrl.setPath(m_dlgFtpSetting.getRemotePathSetting().toLatin1());
        qDebug() <<"ftp 文件设置 " <<m_dlgFtpSetting.getRemotePathSetting().toLatin1();
        ui->lineEditRemotePath->setText(m_dlgFtpSetting.getRemotePathSetting());
    }

    qDebug() <<  m_pUrl.host() << m_pUrl.port() << m_pUrl.userName() << m_pUrl.password();

    //检测URL地址是否合法
    if (!m_pUrl.isValid())
    {
        QMessageBox::critical(NULL, tr("Error"), "URL地址不合法！" );
    }
    else if (m_pUrl.scheme() != "ftp")
    {
        QMessageBox::critical(NULL, tr("Error"), "URL地址必须以ftp开头！");
    }
}

// 更新上传进度
void FtpFileTool::slot_uploadProgress(qint64 bytesSent, qint64 bytesTotal)
{
    ui->progressBarUpload->setMaximum(bytesTotal);
    ui->progressBarUpload->setValue(bytesSent);
}

void FtpFileTool::slot_error(QNetworkReply::NetworkError code)
{
    QMessageBox messageBox(this);
    messageBox.setWindowTitle("erro");
    messageBox.setText("upload error, "+QString::number(code).toLatin1());
    messageBox.exec();
}

// 删除指针，更新和关闭文件
void FtpFileTool::slot_replyFinished(QNetworkReply*)
{
    if (m_pReply->error() == QNetworkReply::NoError)
    {
        m_pReply->deleteLater();
        m_pFile->flush();
        m_pFile->close();
    }
    else
    {
        QMessageBox::critical(NULL, tr("Error"), "错误!!!");
    }
}

// 参数配置界面和参数接收
#ifndef DIALOGFTPSETTING_H
#define DIALOGFTPSETTING_H

#include <QDialog>
#include <QTcpSocket>

namespace Ui {
class DialogFTPSetting;
}

class DialogFTPSetting : public QDialog
{
    Q_OBJECT

public:
    explicit DialogFTPSetting(QWidget *parent = 0);
    ~DialogFTPSetting();

    QString getRemotePathSetting();
    QString getRemoteIP();
    QString getRemotePort();
    QString getUserName();
    QString getPassword();

public slots:
    void slot_setNewRemoteConfig(const QString strPath);

signals:
    void sig_ftpConfigChanged();    // 参数配置改变的时候发出信号

private slots:
    void slot_getRemoteConfig();    // 接受远程参数配置数据

    void slot_connectOrDisconnect();   // 确认参数，并建立链接， 接受远程参数设置

    void slot_updateAsDisconnected();   // 被动断开界面刷新

    void slot_sureConfig();

private:
    Ui::DialogFTPSetting *ui;
    QTcpSocket m_clientSocket;
};

#endif // DIALOGFTPSETTING_H

```cpp
#include "DialogFTPSetting.h"
#include "ui_DialogFTPSetting.h"
#include <QHostAddress>
DialogFTPSetting::DialogFTPSetting(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DialogFTPSetting)
{
    ui->setupUi(this);
    connect(ui->pushButtonConnect, &QPushButton::clicked, this, &DialogFTPSetting::slot_connectOrDisconnect);
    connect(&m_clientSocket, &QTcpSocket::disconnected, this, &DialogFTPSetting::slot_updateAsDisconnected);
    connect(ui->buttonBox, &QDialogButtonBox::accepted, this, &DialogFTPSetting::slot_sureConfig);
}

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

QString DialogFTPSetting::getRemotePathSetting()
{
    return ui->lineEdit_RecvMsg->text().toLatin1();
}

QString DialogFTPSetting::getRemoteIP()
{
    return ui->lineEditIP->text();
}

QString DialogFTPSetting::getRemotePort()
{
    return ui->lineEditPort->text();
}

QString DialogFTPSetting::getUserName()
{
    return ui->lineEditUserName->text();
}

QString DialogFTPSetting::getPassword()
{
    return ui->lineEditPassword->text();
}

void DialogFTPSetting::slot_getRemoteConfig()
{
    QByteArray recvByts = m_clientSocket.readAll();
    QString strRecv = QString(recvByts);
    ui->lineEdit_RecvMsg->setText(strRecv.toLatin1());
    //    m_remoteConfig = strRecv.toLatin1();
}

void DialogFTPSetting::slot_setNewRemoteConfig(const QString strPath)
{
    ui->lineEdit_RecvMsg->setText(strPath);
}

void DialogFTPSetting::slot_connectOrDisconnect()
{
    if(ui->pushButtonConnect->text() == tr("断开"))
    {
        m_clientSocket.disconnectFromHost();
        ui->lineEditIP->setEnabled(true);
        ui->lineEditPassword->setEnabled(true);
        ui->lineEditPort->setEnabled(true);
        ui->lineEditUserName->setEnabled(true);
        ui->pushButtonConnect->setText("连接");
    }
    else
    {
        quint16 port = ui->lineEditPort->text().toUInt();
        QHostAddress ip(ui->lineEditIP->text());
        m_clientSocket.connectToHost(ip, port);
        // 监听接受配置
        connect(&m_clientSocket, &QIODevice::readyRead, this, &DialogFTPSetting::slot_getRemoteConfig);
        if(m_clientSocket.isOpen())
        {
            ui->lineEditIP->setEnabled(false);
            ui->lineEditPassword->setEnabled(false);
            ui->lineEditPort->setEnabled(false);
            ui->lineEditUserName->setEnabled(false);
            ui->pushButtonConnect->setText("断开");
        }
    }
}

void DialogFTPSetting::slot_updateAsDisconnected()
{
    ui->lineEditIP->setEnabled(true);
    ui->lineEditPassword->setEnabled(true);
    ui->lineEditPort->setEnabled(true);
    ui->lineEditUserName->setEnabled(true);
    ui->pushButtonConnect->setText("连接");
}

void DialogFTPSetting::slot_sureConfig()
{
    emit sig_ftpConfigChanged();
}

三、坑
1.远程路径， 使用QUrl 的setPath（） 函数来设定远程文件时候，文件路径不包含ftp://ip// , 这个部分应该是在 设置ftp ip 时候已经默认了，用户在setpath 只要告诉 下图 path 这部分，否则会有 网络错误码201