基于Qt实现文件上传功能，包括客户端和服务端源码。

#include "widget.h" #include "ui_widget.h" #include <QtNetwork> #include <QFileDialog> #pragma execution_character_set("utf-8") Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); this->setWindowTitle("文件传输客户端"); ui->sendButton->setEnabled(false); m_payloadSize=64*1024; m_totalBytes=0; m_bytesWritten=0; m_bytesToWrite=0; ui->hostLineEdit->setText("127.0.0.1"); ui->portLineEdit->setText("9999"); m_tcpClient = new QTcpSocket(this); // m_tcpClient->connectToHost()连接成功后会调用此函数 connect(m_tcpClient,SIGNAL(connected()),this,SLOT(startTransfer())); // 执行m_tcpClient->write(m_outBlock)会触发此函数进行文件传输 connect(m_tcpClient,SIGNAL(bytesWritten(qint64)),this,SLOT(updateClientProgress(qint64))); // m_tcpClient连接和传输过程中出错，均会调用此函数进行提示 connect(m_tcpClient,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(displayError(QAbstractSocket::SocketError))); // connect(ui->sendButton,SIGNAL(clicked(bool)),this,SLOT(sendBtnClicked())); // connect(ui->openButton,SIGNAL(clicked(bool)),this,SLOT(openBtnClicked())); } Widget::~Widget() { delete ui; } void Widget::openFile() { m_fileName=QFileDialog::getOpenFileName(this); if(!m_fileName.isEmpty()) { ui->sendButton->setEnabled(true); ui->clientStatusLabel->setText(QString("文件打开成功，请点击发送！")); ui->lineEdit->setText(m_fileName); } } void Widget::sendFile() { ui->sendButton->setEnabled(false); m_bytesWritten=0; ui->clientStatusLabel->setText("正在连接中..."); m_tcpClient->connectToHost(ui->hostLineEdit->text(),ui->portLineEdit->text().toInt()); } void Widget::startTransfer() { // 打开需要传输的文件 m_localFile = new QFile(m_fileName); if(!m_localFile->open(QFile::ReadOnly)) { ui->clientStatusLabel->setText("文件打开失败!"); return; } // 初始化总大小字节数 m_totalBytes = m_localFile->size(); // 定义数据流 QDataStream sendOut(&m_outBlock,QIODevice::WriteOnly); sendOut.setVersion(QDataStream::Qt_5_9); QString strFileName = m_fileName.right(m_fileName.size()- m_fileName.lastIndexOf('/')-1); //数据流中写入文件总大小、文件名大小、文件名，qint64(0)占位用 sendOut << qint64(0) << qint64(0) << strFileName; // 修改总大小字节数 m_totalBytes += m_outBlock.size(); //修改数据流中写入的文件总大小、文件名大小 sendOut.device()->seek(0); sendOut << m_totalBytes << qint64(m_outBlock.size()-sizeof(qint64)*2); // 先调用m_tcpClient->write(m_outBlock)把m_outBlock中的文件总大小qint64、文件名大小qint64、文件名QString发出去 m_bytesToWrite = m_totalBytes - m_tcpClient->write(m_outBlock); ui->clientStatusLabel->setText("服务端连接成功"); m_outBlock.resize(0); } void Widget::updateClientProgress(qint64 numBytes) { m_bytesWritten += (int)numBytes; if(m_bytesToWrite > 0) { // 一次发送64*1024byte内容 m_outBlock = m_localFile->read(qMin(m_bytesToWrite,m_payloadSize)); m_bytesToWrite -= (int)m_tcpClient->write(m_outBlock); m_outBlock.resize(0); } else { if(m_localFile->isOpen()) { m_localFile->close(); } } int nPercent = (double)m_bytesWritten*100 / m_totalBytes ; ui->clientProgressBar->setMaximum(100); if(m_bytesWritten == m_totalBytes) { ui->clientProgressBar->setValue(100); ui->clientStatusLabel->setText(QString("传送文件 %1 成功").arg(m_fileName)); if(m_localFile->isOpen()) { m_localFile->close(); } m_tcpClient->close(); } else { ui->clientProgressBar->setValue(nPercent); } } void Widget::displayError(QAbstractSocket::SocketError) { qDebug()<<m_tcpClient->errorString(); m_tcpClient->close(); ui->clientProgressBar->reset(); QString sError = m_tcpClient->errorString(); sError = QString("客户端出错：%1,请检查服务端是否连接正常").arg(sError); ui->clientStatusLabel->setText(sError); ui->sendButton->setEnabled(true); } void Widget::on_openButton_clicked() { ui->clientProgressBar->reset(); ui->clientStatusLabel->setText("等待打开文件！"); openFile(); } void Widget::on_closeButton_clicked() { close(); } void Widget::on_sendButton_clicked() { sendFile(); }