Jquery fileupload和nodejs实现文件异步上传

通过jquery fileupload插件和nodejs formidable插件实现文件异步上传,并且可以显示文件上传的进度。

1、插件准备

      jquery fileuplaod:下载地址:https://github.com/blueimp/jQuery-File-Upload/tags

     formidable:下载及安装:https://github.com/felixge/node-formidable

     源码中使用了Express框架:https://github.com/visionmedia/express

2、前端代码

      先上一个上传的页面

Jquery fileupload和nodejs实现文件异步上传_第1张图片

        图中“异步上传“的选择文件Element的ID为fileupload,因为使用了jquery fileupload插件,js代码就比较简单了,如下:

 $('#fileupload').fileupload({
        url: '/upload',
        dataType: 'json',
        //autoUpload: false,
        //acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
        maxFileSize: 5000000, // 5 MB
        // Enable image resizing, except for Android and Opera,
        // which actually support image resizing, but fail to
        // send Blob objects via XHR requests:
        disableImageResize: /Android(?!.*Chrome)|Opera/
            .test(window.navigator.userAgent),
        previewMaxWidth: 100,
        previewMaxHeight: 100,
        previewCrop: true
    }).on('fileuploadadd', function (e, data) {
        data.context = $('
').appendTo('#files'); $.each(data.files, function (index, file) { var node = $('

') .append($('').text(file.name)); //if (!index) { // node // .append('
') // .append(uploadButton.clone(true).data(data)); //} node.appendTo(data.context); }); }).on('fileuploadprocessalways', function (e, data) { var index = data.index, file = data.files[index], node = $(data.context.children()[index]); if (file.preview) { node .prepend('
') .prepend(file.preview); } if (file.error) { node .append('
') .append($('').text(file.error)); } if (index + 1 === data.files.length) { data.context.find('button') .text('Upload') .prop('disabled', !!data.files.error); } }).on('fileuploadprogressall', function (e, data) { var progress = parseInt(data.loaded / data.total * 100, 10); $('#progress .progress-bar').css( 'width', progress + '%' ); }).on('fileuploaddone', function (e, data) { $.each(data.result.files, function (index, file) { if (file.url) { var link = $('') .attr('target', '_blank') .prop('href', file.url); $(data.context.children()[index]) .wrap(link); } else if (file.error) { var error = $('').text(file.error); $(data.context.children()[index]) .append('
') .append(error); } }); }).on('fileuploadfail', function (e, data) { $.each(data.files, function (index, file) { var error = $('').text('File upload failed.'); $(data.context.children()[index]) .append('
') .append(error); }); }).prop('disabled', !$.support.fileInput) .parent().addClass($.support.fileInput ? undefined : 'disabled');


3、服务端代码

     基于Node平台,使用formidable插件,轻松实现文件上传,上传的文件保存在了tmp/文件夹下,如下:

exports.upload = function(req, res) {
	// parse a file upload
	var form = new formidable.IncomingForm(),files=[],fields=[],docs=[];
	console.log('start upload');
	
	//存放目录
	form.uploadDir = 'tmp/';

	form.on('field', function(field, value) {
		//console.log(field, value);
		fields.push([field, value]);
	}).on('file', function(field, file) {
		console.log(field, file);
		files.push([field, file]);
		docs.push(file);


		var types = file.name.split('.');
		var date = new Date();
		var ms = Date.parse(date);
		fs.renameSync(file.path, "tmp/files" + ms + '_'+file.name);
	}).on('end', function() {
		console.log('-> upload done');
		res.writeHead(200, {
			'content-type': 'text/plain'
		});
		var out={Resopnse:{
			'result-code':0,
			timeStamp:new Date(),
		},
		files:docs
		};
		var sout=JSON.stringify(out);
		res.end(sout);
	});

	form.parse(req, function(err, fields, files) {
		err && console.log('formidabel error : ' + err);

		console.log('parsing done');
	});

};

这样就实现了文件的异步上传, 点击下载源码

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