基于QT实现文件上传和下载功能

本文实例为大家分享了基于QT实现文件上传和下载的具体代码，供大家参考，具体内容如下

功能

支持文件上传功能支持文件下载功能支持断点续传功能支持连续多个文件的上传下载

文件上传下载流程

在确认断点的时候会利用md5进行数据校验，防止数据发生更改。





服务端

采用多线程的Reactor模式。即一个线程对应多个filesocket进行文件上传下载。线程个数可设置，默认为1.FileServer>FileSocket采用Qt本身的事件循环和信号槽机制进行数据传输。通过设置两者的交互机制，避免了tcp的粘包问题以及QTcpSocket的readyRead信号触发问题。

服务端代码：

//fileserver.h
#ifndef FILESERVER_H
#define FILESERVER_H

#include <QObject>
#include <QTcpServer>
#include <QAbstractSocket>
#include <QTcpSocket>
#include <QMap>
#include <QString>
#include <QThread>

class FileServer : public QTcpServer
{
    Q_OBJECT
public:
    explicit FileServer(QString param_server_name,quint8 param_thread_count=1,QObject *parent = nullptr);
    ~FileServer();

    QString getServername() {return m_server_name;}
    quint8 getThreadCount() {return m_thread_count;}
    //获取当前每个线程的活跃socket数量
    void threadMonitor(QMap<qint32,quint32>& param_info);

signals:

public slots:
    //开始监听
    bool run(quint16 port);
    void socketClose(qint32 id);

protected:
    void incomingConnection(qintptr socketDescriptor);

    struct ThreadInfo //线程信息，包括标志线程的ID和活跃socket的数量
    {
        qint32 id;
        QThread msg_thread;
        quint32 active_count;
    };
    //获取活跃socket数量最小的线程id
    qint32 getMinActiveThread();

private:
    QString m_server_name;
    quint8 m_thread_count;
    ThreadInfo* m_socket_thread;

};


//fileserver.cpp
#include "fileserver.h"
#include "filesocket.h"

#include <QTcpSocket>
#include <QHostAddress>

FileServer::FileServer(QString param_server_name,quint8 param_thread_count,QObject *parent) :
    QTcpServer(parent),
    m_server_name(param_server_name),
    m_thread_count(param_thread_count)
{
    //根据用户给定的线程个数进行线程信息数组的申请，并进行初始化
    this->m_socket_thread=new ThreadInfo[this->m_thread_count];
    for(qint32 index=0;index<this->m_thread_count;index++)
    {
        this->m_socket_thread[index].id=index;
        this->m_socket_thread[index].active_count=0;
        //启动线程
        this->m_socket_thread[index].msg_thread.start();
    }
}

FileServer::~FileServer()
{
    if(this->isListening())
    {
        this->close();
    }
    
    //释放申请的线程信息数组
    delete [] this->m_socket_thread;
    this->m_socket_thread=nullptr;
}

void FileServer::threadMonitor(QMap<qint32, quint32>& param_info)
{
    for(qint32 index=0;index<this->m_thread_count;index++)
    {
        param_info[index]=this->m_socket_thread[index].active_count;
    }
}

bool FileServer::run(quint16 port)
{
    if(this->isListening())
    {
        qDebug()<<"port("<<port<<")already listen,please close first."<<endl;
        return true;
    }

    if(this->listen(QHostAddress::Any,port))
    {
        qDebug()<<"listen "<<this->m_server_name<<"port("<<port<<") successful."<<endl;
        return true;
    }
    else
    {
        qDebug()<<"listen "<<"port("<<port<<") failed,please check the network port."<<endl;
        return false;
    }
}

void FileServer::socketClose(qint32 id)
{
    //槽函数，socket关闭的时候，将对应的线程的活跃socket数量减一
    this->m_socket_thread[id].active_count--;
}

void FileServer::incomingConnection(qintptr socketDescriptor)
{
    qDebug()<<"new client connection:"<<socketDescriptor<<endl;
    qint32 thread_id=this->getMinActiveThread();
    //建立新的socket
    FileSocket* new_socket=new FileSocket(this->m_socket_thread[thread_id].id,socketDescriptor);
    connect(new_socket,SIGNAL(socketClose(qint32)),this,SLOT(socketClose(qint32)));
    //移入到线程中运行
    new_socket->moveToThread(&(this->m_socket_thread[thread_id].msg_thread));
    this->m_socket_thread[thread_id].active_count++;
}

qint32 FileServer::getMinActiveThread()
{
    qint32 min_id=0;
    for(qint32 index=1;index<this->m_thread_count;index++)
    {
        if(this->m_socket_thread[min_id].active_count>this->m_socket_thread[index].active_count)
        {
            min_id=index;
        }
    }

    return min_id;
}

#endif // FILESERVER_H

filesocket

//filesocket.h
#ifndef FILESOCKET_H
#define FILESOCKET_H

#include <QObject>
#include <QAbstractSocket>
#include <QTcpSocket>
#include <QByteArray>
#include <QFile>

//文件上传下载的字段定义
#define FILE_UPLOAD_HEADER             100
#define FILE_UPLOAD_POS                101
#define FILE_UPLOAD_TAIL               103
#define FILE_DOWNLOAD_HEADER           200
#define FILE_DOWNLOAD_CONTENT          202
#define FILE_DOWNLOAD_TAIL             203

//错误码定义
#define OK                             0
#define FILE_WRITE_ERROR               -1
#define FILE_OPEN_ERROR                -2
#define FILE_SEEK_ERROR                -3
#define FILE_ALREADY_EXISTS_ERROR      -4
#define RECV_DATA_TIMEOUT_ERROR        -5
#define RECV_UNKNOW_DATA_ERROR         -6
#define CONNECT_SERVER_ERROR           -7
#define UPLOAD_FILE_ERROR              -8
#define DOWNLOAD_FILE_ERROR            -10


class FileSocket : public QObject
{
    Q_OBJECT
public:
    explicit FileSocket(qint32 param_id,qintptr param_socketDescriptor,QObject *parent = nullptr);
    ~FileSocket();

signals:
    void socketClose(qint32); //当socket关闭的时候，向FileServer发送关闭信号

public slots:
    void socketError(QAbstractSocket::SocketError param_error);
    void socketDisconnect();
    
    //绑定readyRead信号，进行数据读取
    void fileRead();
    
    //文件数据处理
    void fileHandle(qint64 param_request_id,QMap<QString,QVariant>& param_qst_file,QMap<QString,QVariant>& param_rst_file,bool& reply);

protected:
    void paramInit();
    qint64 fileUploadHeader(QString filename,qint64& pos,QString& md5_value);
    qint64 fileUploadPos(qint64 file_pos);

    qint64 fileDownloadHeader(QString filename,qint64& pos,QString& md5_value,qint64& file_size);
    qint64 fileDownloadContent();

private:
    qint32 m_id;
    QTcpSocket m_socket;

    qint64 m_fileupload_state; //文件上传中间状态标志，分为头尾处理状态和文件数据传输状态。
    qint64 m_file_totalBytes;
    qint64 m_file_pos;
    qint64 m_req_id;

    QByteArray m_msgBytes;
    QFile m_local_file;
    qint64 m_status;
};
#endif // FILESOCKET_H

//filecosket.cpp
#include "filesocket.h"

#include <QDataStream>
#include <QByteArray>
#include <QMap>
#include <QVariant>
#include <QString>
#include <QCryptographicHash>

const QString g_root_dir=".";

FileSocket::FileSocket(qint32 param_id,qintptr param_socketDescriptor,QObject *parent) :
    QObject(parent),
    m_id(param_id),
    m_socket(this),
    m_fileupload_state(0),
    m_local_file(this)
{
    this->m_msgBytes.resize(0);
    this->paramInit();
    this->m_socket.setSocketDescriptor(param_socketDescriptor);

    connect(&(this->m_socket),SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(socketError(QAbstractSocket::SocketError)));
    //绑定readyRead信号，进行数据读取
    connect(&(this->m_socket),SIGNAL(readyRead()),this,SLOT(fileRead()));
}

FileSocket::~FileSocket()
{

}

void FileSocket::socketError(QAbstractSocket::SocketError param_error)
{
    qDebug()<<"socket error("<<param_error<<"): "<<this->m_socket.errorString()<<endl;
    this->m_fileupload_state=0;
    this->socketDisconnect();
}

void FileSocket::socketDisconnect()
{
    this->m_socket.disconnectFromHost();
    emit socketClose(this->m_id);
    this->deleteLater();
}

void FileSocket::fileRead()
{
    this->m_msgBytes.resize(0);
    this->m_msgBytes=this->m_socket.readAll();
    if(this->m_fileupload_state==0)
    {
        QDataStream file_in(&this->m_msgBytes,QIODevice::ReadOnly);
        QMap<QString,QVariant> param_qst_file;
        file_in>>this->m_req_id>>param_qst_file;

        QByteArray paramBytes;
        bool reply=true;
        QMap<QString,QVariant> param_rst_file;
        this->fileHandle(this->m_req_id,param_qst_file,param_rst_file,reply);
        if(reply==true)
        {
            QDataStream msg_out(&paramBytes,QIODevice::WriteOnly);
            msg_out<<qint64(this->m_req_id)<<param_rst_file;
            this->m_socket.write(paramBytes);
            this->m_socket.waitForBytesWritten();
        }
    }
    else
    {
        //文件上传的时候，开始数据写入
        this->m_file_totalBytes-=this->m_msgBytes.size();
        if(this->m_status!=OK)
        {
            return;
        }

        qint64 wrtieBytes=this->m_local_file.write(this->m_msgBytes);
        if(wrtieBytes==-1)
        {
            qDebug()<<"file write error"<<endl;
            this->m_status=FILE_WRITE_ERROR;
            return;
        }

        if(this->m_file_totalBytes==0)
        {
            this->m_local_file.close();
            QByteArray paramBytes;
            QMap<QString,QVariant> param_rst_file;
            param_rst_file[QString("reply_status")]=QVariant(this->m_status);

            QDataStream msg_out(&paramBytes,QIODevice::WriteOnly);
            msg_out<<qint64(FILE_UPLOAD_TAIL)<<param_rst_file;
            this->m_socket.write(paramBytes);
            this->m_socket.waitForBytesWritten();
            this->m_fileupload_state=0;
        }
    }
}

void FileSocket::fileHandle(qint64 param_request_id,QMap<QString,QVariant>& param_qst_file,QMap<QString,QVariant>& param_rst_file,bool& reply)
{
    switch (param_request_id)
    {
    case FILE_UPLOAD_HEADER:{
        this->paramInit();
        QString file_prjpath=param_qst_file[QString("file_prjpath")].toString();

        qint64 pos=0;
        QString md5_value;
        qint64 status=this->fileUploadHeader(file_prjpath,pos,md5_value);
        if(status==OK)
        {
            this->m_fileupload_state=0;
        }

        param_rst_file[QString("reply_status")]=QVariant(status);
        param_rst_file[QString("file_pos")]=QVariant(pos);
        param_rst_file[QString("file_md5")]=QVariant(md5_value);
        break;
    }
    case FILE_UPLOAD_POS:{

        qint64 file_pos=param_qst_file[QString("file_pos")].toInt();
        this->m_file_totalBytes=param_qst_file[QString("file_size")].toInt();

        qint64 status=this->fileUploadPos(file_pos);
        if(status==OK)
        {
            this->m_fileupload_state=1;
        }

        param_rst_file[QString("reply_status")]=QVariant(status);
        break;
    }
    case FILE_DOWNLOAD_HEADER:{
        this->paramInit();
        QString file_prjpath=param_qst_file[QString("file_prjpath")].toString();
        this->m_file_pos=param_qst_file[QString("file_pos")].toInt();
        QString file_md5_value=param_qst_file[QString("file_md5")].toString();

        qint64 status=this->fileDownloadHeader(file_prjpath,this->m_file_pos,file_md5_value,this->m_file_totalBytes);
        if(status==OK)
        {
            this->m_fileupload_state=0;
        }

        param_rst_file[QString("reply_status")]=QVariant(status);
        param_rst_file[QString("file_pos")]=QVariant(this->m_file_pos);
        param_rst_file[QString("file_size")]=QVariant(this->m_file_totalBytes);
        break;
    }
    case FILE_DOWNLOAD_CONTENT:{
        reply=false;
        this->fileDownloadContent();
        break;
    }
    case FILE_DOWNLOAD_TAIL:{
        qint64 status=OK;
        this->m_fileupload_state=0;
        param_rst_file[QString("reply_status")]=QVariant(status);
        break;
    }
    }
}

void FileSocket::paramInit()
{
    this->m_file_totalBytes=0;
    this->m_status=OK;
    this->m_file_pos=0;
}

qint64 FileSocket::fileUploadHeader(QString filename, qint64 &pos, QString &md5_value)
{
    QString filepath=QString("%1/%2").arg(g_root_dir).arg(filename);
    this->m_local_file.setFileName(filepath);
    if(this->m_local_file.exists()==false)
    {
        pos=0;
        return OK;
    }
    else
    {
        pos=this->m_local_file.size();
        if(pos==0)
        {
            return OK;
        }

        if(this->m_local_file.open(QIODevice::ReadOnly)==false)
        {
             pos=0;
             qDebug()<<"open file("<<this->m_local_file.fileName()<<") failed."<<endl;
             return FILE_OPEN_ERROR;
        }

        QCryptographicHash file_md5(QCryptographicHash::Md5);
        qint64 payloadSize=10*1024*1024;
        QByteArray file_data=this->m_local_file.read(payloadSize);
        while(!file_data.isEmpty())
        {
            file_md5.addData(file_data);
            file_data=this->m_local_file.read(payloadSize);
        }
        this->m_local_file.close();
        md5_value=QString(file_md5.result().toHex());

        return OK;
    }
}

qint64 FileSocket::fileUploadPos(qint64 file_pos)
{
    if(this->m_local_file.open(QIODevice::WriteOnly)==false)
    {
        qDebug()<<"open file("<<this->m_local_file.fileName()<<") failed."<<endl;
        return FILE_OPEN_ERROR;
    }

    if(this->m_local_file.seek(file_pos)==false)
    {
        qDebug()<<"seek file("<<this->m_local_file.fileName()<<") failed."<<endl;
        this->m_local_file.close();
        return FILE_SEEK_ERROR;
    }

    return OK;
}

qint64 FileSocket::fileDownloadHeader(QString filename, qint64 &pos, QString &md5_value, qint64 &file_size)
{
    this->m_local_file.setFileName(QString("%1/%2").arg(g_root_dir).arg(filename));
    if(this->m_local_file.open(QIODevice::ReadOnly)==false)
    {
        qDebug()<<"file open error"<<endl;
        return FILE_OPEN_ERROR;
    }
    file_size=this->m_local_file.size();

    if(pos==0)
    {
        this->m_local_file.close();
        return OK;
    }

    QCryptographicHash file_md5(QCryptographicHash::Md5);
    qint64 payloadSize=10*1024*1024;
    qint64 file_pos=pos;
    qint64 readBytes=0;
    while(file_pos>0)
    {
        readBytes=qMin(file_pos,payloadSize);
        QByteArray file_data=this->m_local_file.read(readBytes);
        file_md5.addData(file_data);
        file_pos-=readBytes;
    }
    this->m_local_file.close();

    if(QString(file_md5.result().toHex())!=md5_value)
    {
        pos=0;
    }
    file_size-=pos;

    return OK;
}

qint64 FileSocket::fileDownloadContent()
{
    if(this->m_local_file.open(QIODevice::ReadOnly)==false)
    {
        qDebug()<<"file open error"<<endl;
        return FILE_OPEN_ERROR;
    }
    this->m_local_file.seek(this->m_file_pos);

    qint64 payloadSize=1*1024*1024;
    while(this->m_file_totalBytes!=0)
    {
        QByteArray readData=this->m_local_file.read(qMin(this->m_file_totalBytes,payloadSize));
        this->m_file_totalBytes-=this->m_socket.write(readData);
        this->m_socket.waitForBytesWritten();
    }

    return OK;
}

客户端

即支持单个文件和文件列表的上传和下载，一个socket可连续进行文件的上传和下载。

客户端源码

//fileclient.h
#ifndef FILECLIENT_H
#define FILECLIENT_H

#include <QObject>
#include <QAbstractSocket>
#include <QTcpSocket>
#include <QByteArray>
#include <QString>
#include <QStringList>
#include <QFile>

//文件上传下载字段定义
#define FILE_UPLOAD_HEADER             100
#define FILE_UPLOAD_POS                101
#define FILE_UPLOAD_TAIL               103
#define FILE_DOWNLOAD_HEADER           200
#define FILE_DOWNLOAD_CONTENT          202
#define FILE_DOWNLOAD_TAIL             203

//错误码定义
#define OK                             0
#define FILE_WRITE_ERROR               -1
#define FILE_OPEN_ERROR                -2
#define FILE_SEEK_ERROR                -3
#define FILE_ALREADY_EXISTS_ERROR      -4
#define RECV_DATA_TIMEOUT_ERROR        -5
#define RECV_UNKNOW_DATA_ERROR         -6
#define CONNECT_SERVER_ERROR           -7
#define UPLOAD_FILE_ERROR              -8
#define DOWNLOAD_FILE_ERROR            -10

class FileClient : public QObject
{
    Q_OBJECT
public:
    explicit FileClient(QString ip,quint16 port,QObject *parent = nullptr);
    ~FileClient();

public slots:
    qint64 filesUpload(QStringList filepath_list);
    qint64 fileUpload(QString filepath);

    qint64 filesDownload(QStringList filepath_list);
    qint64 fileDownload(QString filepath);

protected:
    qint64 fileUploadHeader(QString filepath);
    qint64 fileUploadPos();
    qint64 fileUploadContent();
    qint64 fileUploadTail();

    qint64 fileDownloadHeader(QString filepath);
    qint64 fileDownloadContent();
    qint64 fileDownloadTail();

    qint64 fileUploadRecvData(qint64 req_id,QMap<QString, QVariant>& recv_data);
    bool socketConnect();
    void paramInit();
    qint64 file_clc_md5(QString &md5_value);

private:
    QString m_ip;
    quint16 m_port;

    qint64 m_file_pos;
    qint64 m_payloadSize;
    qint64 m_file_total_size;

    QFile m_local_file;
    QTcpSocket m_socket;
};

#endif // FILECLIENT_H

//fileclient.cpp
#include "fileclient.h"

#include <QDataStream>
#include <QHostAddress>
#include <QFile>
#include <QCryptographicHash>
#include <QVariant>
#include <QFile>
#include <QFileInfo>

FileClient::FileClient(QString ip,quint16 port,QObject *parent) :
    QObject(parent),
    m_ip(ip),
    m_port(port),
    m_socket(this)
{

}

FileClient::~FileClient()
{
    if(this->m_socket.isOpen())
    {
        this->m_socket.close();
    }
}

qint64 FileClient::filesUpload(QStringList filepath_list)
{
    qint64 status=OK;
    foreach (QString filepath, filepath_list)
    {
        status=this->fileUpload(filepath);
        if(status!=OK)
        {
            return status;
        }
    }

    return status;
}

qint64 FileClient::fileUpload(QString filepath)
{
    qint64 status=OK;
    this->paramInit();

    status=this->fileUploadHeader(filepath);
    if(status==FILE_ALREADY_EXISTS_ERROR) //already exist
    {
        return OK;
    }
    else if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    status=this->fileUploadPos();
    if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    status=this->fileUploadContent();
    if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    status=this->fileUploadTail();
    if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    return status;
}

qint64 FileClient::filesDownload(QStringList filepath_list)
{
    qint64 status=OK;
    foreach (QString filepath, filepath_list)
    {
        status=this->fileDownload(filepath);
        if(status!=OK)
        {
            return status;
        }
    }

    return status;
}

qint64 FileClient::fileDownload(QString filepath)
{
    qint64 status=OK;
    this->paramInit();
    status=this->fileDownloadHeader(filepath);
    if(status==FILE_ALREADY_EXISTS_ERROR) //already exists
    {
        return OK;
    }
    else if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    status=this->fileDownloadContent();
    if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    status=this->fileDownloadTail();
    if(status!=OK)
    {
        this->m_socket.disconnectFromHost();
        return status;
    }

    return status;
}

qint64 FileClient::fileUploadRecvData(qint64 req_id, QMap<QString, QVariant>& recv_data)
{
    if(this->m_socket.waitForReadyRead()==false)
    {
        return RECV_DATA_TIMEOUT_ERROR;
    }

    qint64 recv_rsp_id=OK;
    QByteArray inblock=this->m_socket.readAll();
    QDataStream rsp_in(&inblock,QIODevice::ReadOnly);
    rsp_in>>recv_rsp_id>>recv_data;

    if(req_id!=recv_rsp_id)
    {
        return RECV_UNKNOW_DATA_ERROR;
    }

    return qint64(recv_data[QString("reply_status")].toInt());
}

qint64 FileClient::fileUploadHeader(QString filepath)
{
    if(this->m_socket.isOpen()==false)
    {
        if(this->socketConnect()==false)
        {
            qDebug()<<"socket connect failed:"<<this->m_socket.errorString()<<endl;
            return CONNECT_SERVER_ERROR;
        }
    }

    this->m_local_file.setFileName(filepath);
    if(this->m_local_file.open(QIODevice::ReadOnly)==false)
    {
        qDebug()<<"read file failed:"<<this->m_local_file.errorString()<<endl;
        return FILE_OPEN_ERROR;
    }
    this->m_file_total_size=this->m_local_file.size();
    this->m_local_file.close();

    QByteArray outblock;
    QDataStream file_out(&outblock,QIODevice::WriteOnly);
    QMap<QString,QVariant> file_header;
    file_header[QString("file_prjpath")]=QVariant(filepath.right(filepath.size()-filepath.lastIndexOf('/')-1));
    file_out<<qint64(FILE_UPLOAD_HEADER)<<file_header;

    this->m_socket.write(outblock);
    this->m_socket.waitForBytesWritten();

    QMap<QString, QVariant> rsp_msg;
    qint64 recv_status=this->fileUploadRecvData(FILE_UPLOAD_HEADER,rsp_msg);
    if(recv_status!=OK)
    {
        return recv_status;
    }
    this->m_file_pos=rsp_msg[QString("file_pos")].toInt();
    QString recv_md5=rsp_msg[QString("file_md5")].toString();

    if(this->m_file_pos==0)
    {
        return OK;
    }
    else
    {
        if(this->m_local_file.open(QIODevice::ReadOnly)==false)
        {
            return FILE_OPEN_ERROR;
        }

        qint64 readtotalBytes=0;
        qint64 payloadSize=10*1024*1024;
        QCryptographicHash clc_md5(QCryptographicHash::Md5);
        while(readtotalBytes<this->m_file_pos)
        {
            qint64 readBytes=qMin(payloadSize,this->m_file_pos-readtotalBytes);
            clc_md5.addData(this->m_local_file.read(readBytes));
            readtotalBytes+=readBytes;
        }
        this->m_local_file.close();

        if(QString(clc_md5.result().toHex())!=recv_md5)
        {
            this->m_file_pos=0;
        }

        this->m_file_total_size-=this->m_file_pos;
        if(this->m_file_total_size==0)
        {
            return FILE_ALREADY_EXISTS_ERROR;
        }
        else
        {
            return OK;
        }

    }
}

qint64 FileClient::fileUploadPos()
{
    QByteArray outblock;
    QDataStream file_out(&outblock,QIODevice::WriteOnly);
    QMap<QString,QVariant> file_header;
    file_header[QString("file_pos")]=QVariant(this->m_file_pos);
    file_header[QString("file_size")]=QVariant(this->m_file_total_size);
    file_out<<qint64(FILE_UPLOAD_POS)<<file_header;

    this->m_socket.write(outblock);
    this->m_socket.waitForBytesWritten();

    QMap<QString, QVariant> rsp_msg;
    qint64 recv_status=this->fileUploadRecvData(FILE_UPLOAD_POS,rsp_msg);

    return recv_status;
}

qint64 FileClient::fileUploadContent()
{
    if(this->m_socket.isOpen()==false)
    {
        return CONNECT_SERVER_ERROR;
    }

    if(this->m_local_file.open(QIODevice::ReadOnly)==false)
    {
        return FILE_OPEN_ERROR;
    }
    this->m_local_file.seek(this->m_file_pos);

    while(this->m_file_total_size!=0)
    {
        this->m_file_total_size-=this->m_socket.write(this->m_local_file.read(qMin(this->m_file_total_size,this->m_payloadSize)));
        this->m_socket.waitForBytesWritten();
    }

    return OK;
}

qint64 FileClient::fileUploadTail()
{
    if(this->m_socket.isOpen()==false)
    {
        return CONNECT_SERVER_ERROR;
    }

    QMap<QString, QVariant> rsp_msg;
    qint64 recv_status=this->fileUploadRecvData(FILE_UPLOAD_TAIL,rsp_msg);
    return recv_status;
}

qint64 FileClient::fileDownloadHeader(QString filepath)
{
    if(this->m_socket.isOpen()==false)
    {
        if(this->socketConnect()==false)
        {
            qDebug()<<"connect server error"<<endl;
            return CONNECT_SERVER_ERROR;
        }
    }

    qint64 file_pos=0;
    QString file_md5_value;
    this->m_local_file.setFileName(filepath);
    if(this->m_local_file.open(QIODevice::ReadOnly)==false)
    {
        file_pos=0;
    }
    else
    {
        file_pos=this->m_local_file.size();
        qint64 readtotalBytes=0;
        qint64 payloadSize=10*1024*1024;
        QCryptographicHash clc_md5(QCryptographicHash::Md5);
        while(readtotalBytes<file_pos)
        {
            qint64 readBytes=qMin(payloadSize,file_pos-readtotalBytes);
            clc_md5.addData(this->m_local_file.read(readBytes));
            readtotalBytes+=readBytes;
        }
        file_md5_value=QString(clc_md5.result().toHex());
        this->m_local_file.close();
    }

    QByteArray outblock;
    QDataStream file_out(&outblock,QIODevice::WriteOnly);
    QMap<QString,QVariant> file_header;
    file_header[QString("file_prjpath")]=QVariant(filepath);
    file_header[QString("file_pos")]=QVariant(file_pos);
    file_header[QString("file_md5")]=QVariant(file_md5_value);
    file_out<<qint64(FILE_DOWNLOAD_HEADER)<<file_header;

    this->m_socket.write(outblock);
    this->m_socket.waitForBytesWritten();

    QMap<QString, QVariant> rsp_msg;
    qint64 recv_status=this->fileUploadRecvData(FILE_DOWNLOAD_HEADER,rsp_msg);
    if(recv_status!=OK)
    {
        return recv_status;
    }

    this->m_file_pos=rsp_msg[QString("file_pos")].toInt();
    this->m_file_total_size=rsp_msg[QString("file_size")].toInt();

    if(0==this->m_file_total_size)
    {
        qDebug()<<"file already exist error"<<endl;
        return FILE_ALREADY_EXISTS_ERROR;
    }

    QByteArray outblock2;
    QDataStream file_out2(&outblock2,QIODevice::WriteOnly);
    QMap<QString,QVariant> file_header2;
    file_header2[QString("reply_status")]=QVariant(qint64(OK));
    file_out2<<qint64(FILE_DOWNLOAD_CONTENT)<<file_header2;

    this->m_socket.write(outblock2);
    this->m_socket.waitForBytesWritten();

    return OK;
}

qint64 FileClient::fileDownloadContent()
{ 
    if(this->m_local_file.open(QIODevice::WriteOnly)==false)
    {
        qDebug()<<"file open error:"<<this->m_local_file.fileName()<<endl;
        return FILE_OPEN_ERROR;
    }
    this->m_local_file.seek(this->m_file_pos);

    qint64 status=OK;
    while(this->m_file_total_size>0)
    {
        if(this->m_socket.waitForReadyRead()==false)
        {
            status=RECV_DATA_TIMEOUT_ERROR;
            break;
        }
        QByteArray inblock=this->m_socket.readAll();
        this->m_file_total_size-=inblock.size();
        if(status==OK)
        {
            if(this->m_local_file.write(inblock)==-1)
            {
                status=FILE_WRITE_ERROR;
            }
        }
    }
    this->m_local_file.close();

    if(status==OK)
    {
        QByteArray outblock2;
        QDataStream file_out2(&outblock2,QIODevice::WriteOnly);
        QMap<QString,QVariant> file_header2;
        file_header2[QString("reply_status")]=QVariant(qint64(OK));
        file_out2<<qint64(FILE_DOWNLOAD_TAIL)<<file_header2;

        this->m_socket.write(outblock2);
        this->m_socket.waitForBytesWritten();
    }

    return status;
}

qint64 FileClient::fileDownloadTail()
{
    QMap<QString, QVariant> rsp_msg;
    qint64 recv_status=this->fileUploadRecvData(FILE_DOWNLOAD_TAIL,rsp_msg);

    return recv_status;
}

bool FileClient::socketConnect()
{
    this->m_socket.close();

    this->m_socket.connectToHost(QHostAddress(this->m_ip),this->m_port);
    if(this->m_socket.waitForConnected()==false)
    {
        qDebug()<<"connect timeout:"<<this->m_ip<<this->m_port<<endl;
        return false;
    }

    return true;
}

void FileClient::paramInit()
{
    this->m_file_pos=0;
    this->m_payloadSize=1*1024*1024;//1MB
    this->m_local_file.close();
    this->m_file_total_size=0;
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易采站长站。