Fine Uploader（http://fineuploader.com/）是一个实现 ajax 上传文件的 Javascript 组件。
This project attempts to achieve a user-friendly file-uploading experience over the web. It's built as a Javascript plugin for developers looking to incorporate file-uploading into their website.
Fine Uploader 不依赖于 jQuery，也就是说不引用jquery.js，也可以正常使用。同时，它也提供了 jQuery Wrapper，可以方便地与jQuery集成。
这篇博文中的示例代码用的就是 Fine Uploader jQuery Wrapper。下面看示例代码：
Web前端实现
1. 下载jQuery Plug-in Fine Uploader，下载地址：https://github.com/valums/file-uploader/wiki/Releases
2. html代码：
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>图片上传 - 博客园</title> <link href="/css/fineuploader.css" rel="stylesheet"> <script src="http://code.jquery.com/jquery-1.8.3.min.js"></script> <script src="/scripts/jquery.fineuploader-3.0.min.js"></script> </head> <body> <div id="jquery-wrapped-fine-uploader"></div> <script> $(function () { $('#jquery-wrapped-fine-uploader').fineUploader({ request: { endpoint: '/ImageUploader/ProcessUpload' } }); }); </script> </body> </html>
代码说明：
a) <div id="jquery-wrapped-fine-uploader"></div>用于显示上传按钮
b) endpoint 设定的是上传时服务端处理ajax请求的网址。
3. 浏览器中的显示效果
服务器 ASP.NET MVC 实现代码
Fine Uploader 的源代码中用 VB.NET 实现了一个 Controller（UploadController.vb），我们在使用时改为了 C# 代码：
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Web; using System.Web.Mvc; namespace CNBlogs.Upload.Web.Controllers { public class ImageUploaderController : Controller { const int ChunkSize = 1024 * 1024; public ActionResult Upload() { return View(); } public ActionResult ProcessUpload(string qqfile) { using (var stream = Request.InputStream) { using (var br = new BinaryReader(stream)) { WriteStream(br, qqfile); } } return Json(new { success = true }); } private void WriteStream(BinaryReader br, string fileName) { byte[] fileContents = new byte[] { }; var buffer = new byte[ChunkSize]; while (br.BaseStream.Position < br.BaseStream.Length - 1) { if (br.Read(buffer, 0, ChunkSize) > 0) { fileContents = fileContents.Concat(buffer).ToArray(); } } using (var fs = new FileStream(@"C:\temp\" + DateTime.Now.ToString("yyyyMMddHHmmSS") + Path.GetExtension(fileName).ToLower(), FileMode.Create)) { using (var bw = new BinaryWriter(fs)) { bw.Write(fileContents); } } } } }
服务器端实现改进版
public ActionResult ProcessUpload(string qqfile) { using (var inputStream = Request.InputStream) { using (var flieStream = new FileStream(@"c: emp" + qqfile, FileMode.Create)) { inputStream.CopyTo(flieStream); } } return Json(new { success = true }); }
相关博文：上传文件就这么简单：Request.InputStream to FileStream
图片上传结果演示
借助 .NET 4.0 新增的 Stream.CopyTo ()，可以轻松实现“流对流”保存上传文件，示例代码如下：
public ActionResult ProcessUpload(string filename) { using (var inputStream = Request.InputStream) { using (var flieStream = new FileStream(@"c: emp" + filename, FileMode.Create)) { inputStream.CopyTo(flieStream); } } return Json(new { success = true }); }