最近学习文件上传，网上例子大多数是HTML5+python的，可惜本人不会python，暂时也没有时间和兴趣研究python，所以用node.js做后台接收文件上传。
写了一个简单的例子，在这里分享给大家。 项目目录如下： |__fileupload |__public // 静态资源目录 |__index.html |__upload.js |__ uploadfiles // 文件上传目录 |__server.js // node.js服务器启动文件
node server.js 启动项目index.html
<!DOCTYPE html> <html> <head> <title>使用XMLHttpRequest上传文件</title> </head> <body> <form id="form1" enctype="multipart/form-data" method="post" action="upload.php"> <div class="row"> <label for="fileToUpload">Select a File to Upload</label> <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();" multiple/> </div> <div id="fileName"></div> <div id="fileSize"></div> <div id="fileType"></div> <div class="row"> <input type="button" onclick="uploadFile()" value="Upload" /> </div> <div id="progressNumber"></div> </form> <script type="application/javascript" src="upload.js"></script> </body> </html>upload.js
function fileSelected() { var file = document.getElementById('fileToUpload').files[0]; if (file) { var fileSize = 0; if (file.size > 1024 * 1024) fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB'; else fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB'; document.getElementById('fileName').innerHTML = 'Name: ' + file.name; document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize; document.getElementById('fileType').innerHTML = 'Type: ' + file.type; } } function uploadFile() { var xhr = new XMLHttpRequest(); var fd = new FormData(); fd.append("author", "connie"); fd.append("name", "Html 5 File API/FormData"); var files = document.getElementById('fileToUpload').files; // 单文件上传 // fd.append("fileToUpload", files[0]); // 多文件上传 for (key in files){ fd.append("fileToUpload", files[key]); } /* event listners */ xhr.upload.addEventListener("progress", uploadProgress, false); xhr.addEventListener("load", uploadComplete, false); xhr.addEventListener("error", uploadFailed, false); xhr.addEventListener("abort", uploadCanceled, false); /* Be sure to change the url below to the url of your upload server side script */ xhr.open("POST", "upload"); xhr.send(fd); } function uploadProgress(evt) { if (evt.lengthComputable) { var percentComplete = Math.round(evt.loaded * 100 / evt.total); document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%'; } else { document.getElementById('progressNumber').innerHTML = 'unable to compute'; } } function uploadComplete(evt) { /* This event is raised when the server send back a response */ alert(evt.target.responseText); } function uploadFailed(evt) { alert("There was an error attempting to upload the file."); } function uploadCanceled(evt) { alert("The upload has been canceled by the user or the browser dropped the connection."); }server.js
/** * Created by Administrator on 2017/6/5. */ var express = require('express'), path = require('path'), app = express(), fs = require('fs'), multiparty = require('multiparty'); // FormData解析工具 var target_path; var config = { upload_dir: 'uploadfiles' } // 引入静态文件代码 app.use(express.static(path.join(__dirname, 'public'))); // 文件上传url app.post('/upload', function(req, res){ var form = new multiparty.Form(); form.parse(req, function (err, fields, files) { if (err){ throw err } console.log(fields); console.log(files); // fields显示非文件类型的所有key、value值 Object.keys(fields).forEach(function(name) { console.log('got field named ' + name); }); for (key in files){ files[key].forEach(function (file, index) { target_path = config.upload_dir + '/' + file.originalFilename; try { // 读取缓存文件，同时写入所需上传的目录 fs.createReadStream(file.path).pipe(fs.createWriteStream(target_path)); console.log(file.originalFilename); console.log('Upload completed!'); res.json({infor:"success"}) } catch (err){ res.json({err:err}) } }) } }); }); app.listen(8080); console.log('Listening on port 8080');