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用nodjs来搭建一个本地的服务器，用qt编写程序实现文件的上传和断点续传的功能

nodejs服务器搭建

先去安装一个nodejs，然后在文件夹中npm init -y初始化nodejs项目,npm install express multer安装所需要的包，在项目目录创建一个server.js文件，并添加下面的代码，最后用node server.js启动服务器，速成参考Node.js 教程 | 菜鸟教程 (runoob.com)

const express = require('express');
const path = require('path');
const fs = require('fs');
const app = express();
const port = 3000;// 提供静态文件服务
app.use(express.static('uploads'));// 处理文件上传的 PUT 请求
app.put('/upload', (req, res) => {// 获取文件名和扩展名const originalFileName = req.headers['x-filename'];const filePath = path.join(__dirname, 'uploads', originalFileName);const range = req.headers['range'];let start = 0;// 处理断点续传if (range) {const parts = range.replace(/bytes=/, "").split("-");start = parseInt(parts[0], 10);}// 创建文件写入流，从指定位置开始写入const uploadStream = fs.createWriteStream(filePath, { flags: 'a', start });// 处理文件上传数据req.on('data', chunk => {uploadStream.write(chunk);});// 处理上传完成req.on('end', () => {uploadStream.end();res.end(`File uploaded successfully as ${originalFileName}`);console.log(`File uploaded successfully as ${originalFileName}`);});// 处理上传中断req.on('aborted', () => {uploadStream.end();console.log('Upload aborted.');});// 处理上传错误req.on('error', err => {uploadStream.end();console.error('Upload error:', err);});
});// 启动服务器
app.listen(port, () => {console.log(`Server running at http://localhost:${port}`);
});

qt代码

• fileuploader.h

#ifndef FILEUPLOADER_H
#define FILEUPLOADER_H#include <QDebug>
#include <QFile>
#include <QFileDialog>
#include <QLabel>
#include <QLineEdit>
#include <QMessageBox>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QObject>
#include <QProgressBar>
#include <QPushButton>
#include <QUrl>
#include <QVBoxLayout>class FileUploader : public QWidget
{Q_OBJECT
public:explicit FileUploader(QWidget *parent = nullptr);~FileUploader();signals:private slots:void selectFile();void startUpload();void pauseUpload();void handleUploadProgress(qint64 bytesSent, qint64 BytesTotal);void handleUploadFinished();public:QVBoxLayout *layout;   //定义垂直布局QHBoxLayout *hLayout1; //定义水平布局QHBoxLayout *hLayout2;QPushButton *selectButton;QPushButton *startButton;QPushButton *pauseButton;QLineEdit *filePathEdit;QProgressBar *progressBar;QWidget *centralWidget;private:QNetworkAccessManager *manager;QNetworkReply *reply;QFile *file;QString selectedFilePath;qint64 uploadBytes; //记录已上传字节数bool isPaused;      //是否已暂停
};#endif // FILEUPLOADER_H

• fileuploader.cpp

#include "fileuploader.h"FileUploader::FileUploader(QWidget *parent): QWidget{parent}
{//窗口初始化layout = new QVBoxLayout();hLayout1 = new QHBoxLayout();hLayout2 = new QHBoxLayout();selectButton = new QPushButton("选择文件", this);startButton = new QPushButton("开始传输", this);pauseButton = new QPushButton("暂停传输", this);filePathEdit = new QLineEdit(this);progressBar = new QProgressBar(this);// progressBar->setRange(0, 100);// progressBar->setValue(0);hLayout1->addWidget(selectButton);hLayout1->addWidget(filePathEdit);hLayout1->addWidget(startButton);layout->addLayout(hLayout1);hLayout2->addWidget(progressBar);hLayout2->addWidget(pauseButton);layout->addLayout(hLayout2);centralWidget = new QWidget(this);centralWidget->setLayout(layout);//网络请求部分初始化manager = new QNetworkAccessManager(this);reply = nullptr;file = nullptr;uploadBytes = 0;isPaused = false;//信号槽注册connect(selectButton, &QPushButton::clicked, this, &FileUploader::selectFile);connect(startButton, &QPushButton::clicked, this, &FileUploader::startUpload);connect(pauseButton, &QPushButton::clicked, this, &FileUploader::pauseUpload);
}FileUploader::~FileUploader()
{reply->deleteLater();file->close();file->deleteLater();file = nullptr;
}void FileUploader::selectFile()
{selectedFilePath = QFileDialog::getOpenFileName(this, "选择一个文件");if (!selectedFilePath.isEmpty()) {filePathEdit->setText(selectedFilePath);}
}
//槽函数，处理开始上传按钮
void FileUploader::startUpload()
{if (selectedFilePath.isNull()) {qDebug() << "没有选择文件";}QUrl url("http://localhost:3000/upload");QNetworkRequest request(url);//设置头部字段,application/octet-stream是一个通用的二进制数据类型request.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");//提取文件名并转为utf8编码的字节数组，作为http头部字段x-filename的值request.setRawHeader("x-filename", QFileInfo(selectedFilePath).fileName().toUtf8());file = new QFile(selectedFilePath);if (!file->open(QIODevice::ReadOnly)) {qDebug() << "文件打开错误";return;}qDebug() << "...........................";//如果文件尚未打开或已经关闭，重新打开if (file == nullptr || !file->isOpen()) {file = new QFile(selectedFilePath);if (!file->open(QIODevice::ReadOnly)) {qDebug() << "文件打开错误";return;}}if (uploadBytes > 0) {request.setRawHeader("Range", QByteArray("bytes=") + QByteArray::number(uploadBytes) + "-");file->seek(uploadBytes);}//发送put请求reply = manager->put(request, file);connect(reply, &QNetworkReply::uploadProgress, this, &FileUploader::handleUploadProgress);connect(reply, &QNetworkReply::finished, this, &FileUploader::handleUploadFinished);
}//槽函数，处理暂停按钮
void FileUploader::pauseUpload()
{if (reply && reply->isRunning()) {reply->abort();isPaused = true;pauseButton->setText("继续");qDebug() << uploadBytes;} else if (isPaused) {isPaused = false;startUpload(); //继续上传pauseButton->setText("暂停");}
}//槽函数，处理上传进度
void FileUploader::handleUploadProgress(qint64 bytesSent, qint64 BytesTotal)
{uploadBytes += bytesSent;progressBar->setMaximum(BytesTotal);progressBar->setValue(uploadBytes);
}//槽函数，传输完成
void FileUploader::handleUploadFinished()
{if (reply->error() == QNetworkReply::NoError) {qDebug() << "上传成功";QMessageBox::information(this, "提示", "上传成功");uploadBytes = 0;} else {qDebug() << "上传失败" << reply->errorString();}
}

• mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);uploader = new FileUploader(this);//初始化窗口界面setCentralWidget(uploader->centralWidget);
}MainWindow::~MainWindow()
{delete ui;
}