Qt 实现ftp工具类，Qt C++代码

以下是一个简单的Qt实现FTP工具类的代码示例：

FTPManager.h 文件：

#ifndef FTPMANAGER_H
#define FTPMANAGER_H

#include <QObject>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkReply>
#include <QUrl>
#include <QFile>
#include <QFileInfo>

class FTPManager : public QObject
{
    Q_OBJECT
public:
    explicit FTPManager(QObject *parent = nullptr);

    void uploadFile(const QString &filePath, const QUrl &url, const QString &userName, const QString &password);
    void downloadFile(const QUrl &url, const QString &userName, const QString &password);

private slots:
    void uploadProgress(qint64 bytesSent, qint64 bytesTotal);
    void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
    void finished(QNetworkReply *reply);

private:
    QNetworkAccessManager *m_manager;
    QFile *m_file;
};

#endif // FTPMANAGER_H

FTPManager.cpp 文件：

#include "FTPManager.h"

FTPManager::FTPManager(QObject *parent) : QObject(parent)
{
    m_manager = new QNetworkAccessManager(this);
}

void FTPManager::uploadFile(const QString &filePath, const QUrl &url, const QString &userName, const QString &password)
{
    m_file = new QFile(filePath);
    if (!m_file->exists()) {
        qDebug() << "File not found!";
        return;
    }

    m_file->open(QIODevice::ReadOnly);

    QNetworkRequest request(url);
    request.setUserName(userName);
    request.setPassword(password);

    QNetworkReply *reply = m_manager->put(request, m_file);

    connect(reply, SIGNAL(uploadProgress(qint64,qint64)), this, SLOT(uploadProgress(qint64,qint64)));
    connect(reply, SIGNAL(finished()), this, SLOT(finished()));
}

void FTPManager::downloadFile(const QUrl &url, const QString &userName, const QString &password)
{
    QNetworkRequest request(url);
    request.setUserName(userName);
    request.setPassword(password);

    QNetworkReply *reply = m_manager->get(request);

    connect(reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(downloadProgress(qint64,qint64)));
    connect(reply, SIGNAL(finished()), this, SLOT(finished()));
}

void FTPManager::uploadProgress(qint64 bytesSent, qint64 bytesTotal)
{
    qDebug() << "Uploading file" << m_file->fileName() << "Progress:" << bytesSent << "/" << bytesTotal;
}

void FTPManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
    qDebug() << "Downloading file Progress:" << bytesReceived << "/" << bytesTotal;
}

void FTPManager::finished(QNetworkReply *reply)
{
    if (reply->error()) {
        qDebug() << "Error:" << reply->errorString();
    }
    else {
        qDebug() << "Finished!";
    }

    reply->deleteLater();
    m_file->close();
}

使用示例：

FTPManager ftpManager;
QUrl url("ftp://example.com/upload/file.txt");
QString userName = "username";
QString password = "password";
QString filePath = "/path/to/local/file.txt";

ftpManager.uploadFile(filePath, url, userName, password);

// 或者下载文件
// ftpManager.downloadFile(url, userName, password);

这个示例实现了FTP文件上传和下载功能，并且可以在控制台中输出上传和下载的进度。您可以根据需要进行更改和完善。