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WebUploader的斷點(diǎn)續(xù)傳功能如何實(shí)現(xiàn)

小樊
83
2024-10-10 11:43:55
欄目: 編程語言

WebUploader 的斷點(diǎn)續(xù)傳功能可以通過以下步驟實(shí)現(xiàn):

  1. 創(chuàng)建一個上傳進(jìn)度事件監(jiān)聽:
webuploader.on('uploadProgress', function(file, percentage) {
    // 更新進(jìn)度條等操作
});
  1. 為每個文件創(chuàng)建一個唯一的斷點(diǎn)續(xù)傳標(biāo)識:
var uploader = WebUploader.create({
    // ...其他配置項(xiàng)
    auto: false, // 關(guān)閉自動上傳
    swf: 'Uploader.swf',
    server: 'your-server', // 服務(wù)器端上傳地址
    pick: '#picker', // 選擇文件的按鈕
    accept: {
        title: 'Images', // 顯示文本
        extensions: 'gif,jpg,jpeg,bmp,png',
        mimeTypes: 'image/*'
    }
});

uploader.on('fileQueued', function(file) {
    // 為文件創(chuàng)建一個唯一的斷點(diǎn)續(xù)傳標(biāo)識
    file.uniqueIdentifier = Date.now() + file.name;
});
  1. 服務(wù)器端接收文件并處理斷點(diǎn)續(xù)傳:

服務(wù)器端需要能夠識別文件的唯一標(biāo)識,并處理文件的分塊上傳。以下是一個使用 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');

    // 創(chuàng)建一個臨時文件來存儲斷點(diǎn)續(xù)傳的文件塊
    const tempFilePath = path.join('uploads/temp', uniqueIdentifier);
    const finalFilePath = path.join('uploads', file.originalname);

    // 將文件塊合并為一個完整的文件
    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); // 刪除已處理的文件塊
    }

    // 將合并后的文件保存到最終目錄
    fs.writeFileSync(finalFilePath, fileContent);

    res.sendStatus(200);
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});
  1. 在客戶端實(shí)現(xiàn)斷點(diǎn)續(xù)傳邏輯:
uploader.on('uploadBeforeSend', function(file, header) {
    // 獲取文件的起始和結(jié)束索引
    const startIndex = Math.floor(file.size * (uploadProgress / 100));
    const endIndex = Math.floor(file.size);

    // 設(shè)置請求頭以發(fā)送斷點(diǎn)續(xù)傳信息
    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);
});

通過以上步驟,WebUploader 的斷點(diǎn)續(xù)傳功能可以實(shí)現(xiàn)。請注意,這個示例僅用于演示目的,實(shí)際應(yīng)用中可能需要根據(jù)具體需求進(jìn)行調(diào)整。

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