NodeJS-图片上传(Express)_html/css_WEB-ITnose

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Release: 2016-06-21 08:59:21
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文件上传是每个网站不可避免的,最近需要做些上传图片的功能,主要解决两个问题,一个是文件上传样式和服务端路径保存,功能很简单,做起来倒是没那么简单,先从最简单的页面的上传页面的样式开始。

页面样式

Html页面默认的上传的是比较难看的,需要重做一个背景图片,通过背景图片添加上传的图片:

上传图片样式:

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CSS样式:

.upload-container { background-image: url(../../images/rv/add.jpg); background-repeat: no-repeat; width: 180px; height: 200px; padding-bottom: 10px; display: inline-block; vertical-align: middle; .fileupload { opacity: 0; filter: alpha(opacity=0); width: 200px; height: 200px; } }
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Html点击上传有两种比较常用的方式iFrame上传和Ajax上传,本文采用了Ajax上传是 HTML5提出了XMLHttpRequest对象的第二版,传递文件数据主要是通过FormData实现:

$('.fileupload').change(function(event) { /* Act on the event */ if ($('.fileupload').val().length) { var fileName = $('.fileupload').val(); var extension = fileName.substring(fileName.lastIndexOf('.'), fileName.length).toLowerCase(); if (extension == ".jpg" || extension == ".png") { var data = new FormData(); data.append('upload', $('#fileToUpload')[0].files[0]); $.ajax({ url: 'apply/upload', type: 'POST', data: data, cache: false, contentType: false, //不可缺参数 processData: false, //不可缺参数 success: function(data) { console.log(data); }, error: function() { console.log('error'); } }); } } });
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服务端保存

NodeJS服务端保存需要使用了第三方插件

node-formidable ,npm安装地址:

npm install formidable@latest
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上传图片

var cacheFolder = 'public/images/uploadcache/';exports.upload = function(req, res) { var currentUser = req.session.user; var userDirPath =cacheFolder+ currentUser.id; if (!fs.existsSync(userDirPath)) { fs.mkdirSync(userDirPath); } var form = new formidable.IncomingForm(); //创建上传表单 form.encoding = 'utf-8'; //设置编辑 form.uploadDir = userDirPath; //设置上传目录 form.keepExtensions = true; //保留后缀 form.maxFieldsSize = 2 * 1024 * 1024; //文件大小 form.type = true; var displayUrl; form.parse(req, function(err, fields, files) { if (err) { res.send(err); return; } var extName = ''; //后缀名 switch (files.upload.type) { case 'image/pjpeg': extName = 'jpg'; break; case 'image/jpeg': extName = 'jpg'; break; case 'image/png': extName = 'png'; break; case 'image/x-png': extName = 'png'; break; } if (extName.length === 0) { res.send({ code: 202, msg: '只支持png和jpg格式图片' }); return; } else { var avatarName = '/' + Date.now() + '.' + extName; var newPath = form.uploadDir + avatarName; displayUrl = UPLOAD_FOLDER + currentUser.id + avatarName; fs.renameSync(files.upload.path, newPath); //重命名 res.send({ code: 200, msg: displayUrl }); } });};
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不同用户上传置放在不同的位置,根据需求来设置,当然也有可以每张图片都给不同的id编号,推荐第三方uuid插件: https://github.com/broofa/node-uuid

文件重命名:

fs.renameSync(files.upload.path, newPath); //重命名
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文件上传进度:

form.on('progress', function(bytesReceived, bytesExpected) {});
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node-formidable 有很多官方API还有很多设置的选项,本文根据需求设置了几项,有额外需求的可以参考官方地址~

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