WebUploader 的断点续传功能可以通过以下步骤实现:
webuploader.on('uploadProgress', function(file, percentage) {
// 更新进度条等操作
});
var uploader = WebUploader.create({
// ...其他配置项
auto: false, // 关闭自动上传
swf: 'Uploader.swf',
server: 'your-server', // 服务器端上传地址
pick: '#picker', // 选择文件的按钮
accept: {
title: 'Images', // 显示文本
extensions: 'gif,jpg,jpeg,bmp,png',
mimeTypes: 'image/*'
}
});
uploader.on('fileQueued', function(file) {
// 为文件创建一个唯一的断点续传标识
file.uniqueIdentifier = Date.now() + file.name;
});
服务器端需要能够识别文件的唯一标识,并处理文件的分块上传。以下是一个使用 Node.js 和 Express 的示例:
const express = require('express');
const multer = require('multer');
const fs = require('fs');
const path = require('path');
const app = express();
const upload = multer({ dest: 'uploads/' });
app.post('/upload', upload.single('file'), (req, res) => {
const file = req.file;
const uniqueIdentifier = file.uniqueIdentifier;
const startIndex = req.header('X-Start-Index');
const endIndex = req.header('X-End-Index');
// 创建一个临时文件来存储断点续传的文件块
const tempFilePath = path.join('uploads/temp', uniqueIdentifier);
const finalFilePath = path.join('uploads', file.originalname);
// 将文件块合并为一个完整的文件
let fileContent = Buffer.alloc(0);
for (let i = startIndex; i <= endIndex; i++) {
const chunkFilePath = `${tempFilePath}_${i}`;
const chunkContent = fs.readFileSync(chunkFilePath);
fileContent = Buffer.concat([fileContent, chunkContent]);
fs.unlinkSync(chunkFilePath); // 删除已处理的文件块
}
// 将合并后的文件保存到最终目录
fs.writeFileSync(finalFilePath, fileContent);
res.sendStatus(200);
});
app.listen(3000, () => {
console.log('Server is running on port 3000');
});
uploader.on('uploadBeforeSend', function(file, header) {
// 获取文件的起始和结束索引
const startIndex = Math.floor(file.size * (uploadProgress / 100));
const endIndex = Math.floor(file.size);
// 设置请求头以发送断点续传信息
header['X-Start-Index'] = startIndex;
header['X-End-Index'] = endIndex;
});
uploader.on('uploadSuccess', function(file, response) {
console.log('Upload success:', file.name);
});
uploader.on('uploadError', function(file, reason) {
console.log('Upload error:', file.name, reason);
});
通过以上步骤,WebUploader 的断点续传功能可以实现。请注意,这个示例仅用于演示目的,实际应用中可能需要根据具体需求进行调整。