用Fine Uploader+ASP.NET MVC实现ajax文件上传[代码示例]

浏览数：22 / 时间：2015年06月09日

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:\temp\" + qqfile, FileMode.Create))
        {
            inputStream.CopyTo(flieStream);
        }
    }
    return Json(new { success = true });
}

图片上传结果演示

上传文件就这么简单：Request.InputStream to FileStream

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:\temp\" + filename, FileMode.Create))
        {
            inputStream.CopyTo(flieStream);
        }
    }
    return Json(new { success = true });
}