node.js实现带进度条的多文件上传

关于“node.js实现带进度条的多文件上传”的攻略,可以分为以下几个步骤:

关于“node.js实现带进度条的多文件上传”的攻略,可以分为以下几个步骤:

1. 搭建服务端

首先需要建立一个node.js的服务端应用,可以使用express框架来快速搭建。具体步骤如下:

  1. 安装express模块:

bash
npm install --save express

  1. 在项目目录下新建一个名为app.js的文件。

  2. app.js文件中引入express模块:

javascript
const express = require('express');

  1. 创建一个express应用:

javascript
const app = express();

  1. 添加一个路由处理文件上传请求:

javascript
app.post('/upload', (req, res) => {
// 文件上传处理代码
});

  1. 启动应用,监听指定端口:

javascript
const server = app.listen(3000, () => {
console.log('Server started on port 3000');
});

2. 实现多文件上传处理

接下来需要实现多文件上传的处理。可以使用multer模块来实现文件上传的中间件功能。

  1. 安装multer模块:

bash
npm install --save multer

  1. app.js文件中引入multer模块:

javascript
const multer = require('multer');

  1. 创建一个multer实例:

``` javascript
const storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'uploads/');
},
filename: (req, file, cb) => {
cb(null, file.originalname);
}
})

const upload = multer({ storage: storage });
```

  1. 在处理文件上传的路由中使用multer中间件:

javascript
app.post('/upload', upload.array('files'), (req, res) => {
res.json({ message: 'Files uploaded successfully.' });
});

  1. multer中的upload.array('files')方法表示接受名为files的文件数组,可以多选上传。

3. 添加进度条功能

最后一步是添加进度条功能。可以使用progressbar模块来实现。

  1. 安装progressbar模块:

bash
npm install --save progressbar

  1. app.js文件中引入progressbar模块:

javascript
const ProgressBar = require('progressbar.js');

  1. 在处理文件上传的路由中添加进度条逻辑:

``` javascript
app.post('/upload', upload.array('files'), (req, res) => {
// 创建进度条实例
const bar = new ProgressBar.Circle('#progress', {
color: '#aaa',
strokeWidth: 4,
trailWidth: 1,
duration: 3000,
text: {
value: '0 %',
className: 'progressbar__label'
},
step: function(state, bar) {
const value = Math.round(bar.value() * 100);
bar.setText(value + ' %');
}
});

 // 计算上传进度
 const total = req.files.length;
 let count = 0;
 req.files.forEach(file => {
   const reader = new FileReader();
   reader.readAsDataURL(file.buffer);
   reader.onloadend = () => {
     count++;
     const progress = Math.round((count / total) * 100) / 100;
     bar.animate(progress);
     if (count === total) {
       res.json({ message: 'Files uploaded successfully.' });
     }
   };
 });

});
```

  1. 添加一个HTML页面,用于上传多个文件:

``` html




Node.js File Upload with ProgressBar Example <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/progressbar.js/1.0.1/progressbar.min.css" /><style> #progress { width: 200px; height: 200px; margin: 20px auto; } .progressbar__label { font-size: 24px; font-weight: bold; color: #aaa; } <p> <br /> <body></p> <h1>Upload multiple files with progressbar</h1> <form id="upload-form" method="post" action="/upload" enctype="multipart/form-data"> <input type="file" name="files" multiple><br /> <br /> <button type="submit">Upload</button><br /> </form> <div id="progress"></div> <p> <script src="https://cdnjs.cloudflare.com/ajax/libs/progressbar.js/1.0.1/progressbar.min.js"><br /> <script> const form = document.getElementById('upload-form'); form.addEventListener('submit', (event) => { event.preventDefault();</p> <p> const xhr = new XMLHttpRequest(); xhr.open('POST', '/upload'); xhr.onload = () => { console.log('Upload completed.'); }; xhr.onerror = () => { console.log('Error occurred while uploading.'); }; xhr.upload.onprogress = (event) => { const loaded = event.loaded; const total = event.total; const progress = Math.round((loaded / total) * 100); console.log(progress + '% uploaded.'); };</p> <p> const files = form.files.files; const formData = new FormData(); for (let i = 0; i < files.length; i++) { formData.append('files', files[i], files[i].name); } xhr.send(formData); }); </script><br /> <br /> </html></p> <p>```</p> <p>以上就是完整的“node.js实现带进度条的多文件上传”的攻略了。下面再给出几个示例:</p> <h2>示例一</h2> <p>假设现在需要上传一个名为<code>example1.jpg</code>的图片和一个名为<code>example2.jpg</code>的图片。</p> <ol> <li> <p>打开刚刚创建的HTML页面。</p> </li> <li> <p>选择需要上传的两张图片文件并点击“Upload”按钮。</p> </li> <li> <p>界面中将显示进度条,进度条将从0%开始进行动画,同时控制台中会显示上传的进度。</p> </li> <li> <p>当上传完成后,控制台会输出“Upload completed.”的提示信息,同时进度条显示100%。</p> </li> </ol> <h2>示例二</h2> <p>假设现在需要上传一个名为<code>example3.jpg</code>的图片和一个名为<code>example4.jpg</code>的图片。</p> <ol> <li> <p>得出上述两张图片的文件大小分别为100KB和200KB,总大小为300KB。</p> </li> <li> <p>打开刚刚创建的HTML页面。</p> </li> <li> <p>选择需要上传的两张图片文件并点击“Upload”按钮。</p> </li> <li> <p>界面中将显示进度条,进度条将从0%开始进行动画,同时控制台中会显示上传的进度。</p> </li> <li> <p>上传过程中,进度条显示的上传进度将根据实际上传进度更新,控制台中将持续输出上传的进度。</p> </li> <li> <p>当上传完成后,控制台会输出“Upload completed.”的提示信息,同时进度条显示100%。</p> </li> </ol></input></p> </article> <script src='/adv.php?aid=2' language='javascript'></script> <!--标签--> <div class="wmd-margin-top b-t"> <div class="tags-item wmd-single-tags"> </div> </div></div> <div class="wmd-background-default b-b wmd-margin-bottom b-r-4"> <div class="wmd-text-small wmd-panding-s"> <div class="single-head"> <div class="wmd-text-small wmd-text-muted wmd-flex wmd-text-truncate wmd-overflow-auto"> <div class="avatar wmd-flex-1 wmd-flex wmd-flex-middle wmd-avatar-t"> <span class="wmd-text-small wmd-display-block wmd-margin-small-left"><a title="文章作者" rel="author">织梦狗教程</a></span> <p>本文标题为:node.js实现带进度条的多文件上传</p> <button id="TKLS" class="wmd-text-fz itemCopy red_tkl button_tkl" type="button" 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