利用Plupload.js解决大文件上传问题, 带进度条和背景遮罩层

      /******************************************************ProgressBar********************************************************/
      var progressBar = $("#loading").progressbar({ width: '500px', color: '#B3240E', border: '1px solid #000000' });
      /******************************************************Plupload***********************************************************/
      //实例化一个plupload上传对象
      var uploader = new plupload.Uploader({
        browse_button: 'browse', //触发文件选择对话框的按钮，为那个元素id
        runtimes: 'html5,flash,silverlight,html4',//兼容的上传方式
        url: "Handlers/UploadCoursePackage.ashx", //后端交互处理地址
        max_retries: 3,   //允许重试次数
        chunk_size: '10mb', //分块大小
        rename: true, //重命名
        dragdrop: false, //允许拖拽文件进行上传
        unique_names: true, //文件名称唯一性

        filters: { //过滤器
          max_file_size: '999999999mb', //文件最大尺寸
          mime_types: [ //允许上传的文件类型
            { title: "Zip", extensions: "zip" },
            { title: "PE", extensions: "pe" }
          ]
        },
        //自定义参数 （键值对形式） 此处可以定义参数
        multipart_params: {
          type: "misoft"
        },
        // FLASH的配置
        flash_swf_url: "../Scripts/plupload/Moxie.swf",

        // Silverligh的配置
        silverlight_xap_url: "../Scripts/plupload/Moxie.xap",

        multi_selection: false //true:ctrl多文件上传, false 单文件上传 
      });

      //在实例对象上调用init()方法进行初始化
      uploader.init();

      uploader.bind('FilesAdded', function (uploader, files) {
        $("#<%=fileSource.ClientID %>").val(files[0].name);
        $.ajax(
        {
          type: 'post',
          url: 'HardDiskSpace.aspx/GetHardDiskFreeSpace',
          data: {},
          dataType: 'json',
          contentType: 'application/json;charset=utf-8',
          success: function (result) {
            //选择文件以后检测服务器剩余磁盘空间是否够用
            if (files.length > 0) {
              if (parseInt(files[0].size) > parseInt(result.d)) {
                $('#error-msg').text("文件容量大于剩余磁盘空间,请联系管理员!");
              } else {
                $('#error-msg').text("");
              }
            }
          },
          error: function(xhr, err, obj) {
            $('#error-msg').text("检测服务器剩余磁盘空间失败");
          }
        });
      });

      uploader.bind('UploadProgress', function (uploader, file) {
        var percent = file.percent;
        progressBar.progress(percent);
      });

      uploader.bind('FileUploaded', function (up, file, callBack) {
        var data = $.parseJSON(callBack.response);
        if (data.statusCode === "1") {
          $("#<%=hfPackagePath.ClientID %>").val(data.filePath);
          var id = $("#<%=hfCourseID.ClientID %>").val();
          __doPostBack("save", id);
        } else {
          hideLoading();
          $('#error-msg').text(data.message);
        }
      });

      uploader.bind('Error', function (up, err) {
        alert("文件上传失败,错误信息: " + err.message);
      });

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;

namespace WebUI.Handlers
{
  /// <summary>
  /// UploadCoursePackage 的摘要说明
  /// </summary>
  public class UploadCoursePackage : IHttpHandler
  {

    public void ProcessRequest(HttpContext context)
    {
      context.Response.ContentType = "text/plain";

      int statuscode = 1;
      string message = string.Empty;
      string filepath = string.Empty;

      if (context.Request.Files.Count > 0)
      {
        try
        {
          string resourceDirectoryName = System.Configuration.ConfigurationManager.AppSettings["resourceDirectory"];
          string path = context.Server.MapPath("~/" + resourceDirectoryName);
          if (!Directory.Exists(path))
            Directory.CreateDirectory(path);

          int chunk = context.Request.Params["chunk"] != null ? int.Parse(context.Request.Params["chunk"]) : 0; //获取当前的块ID，如果不是分块上传的。chunk则为0
          string fileName = context.Request.Params["name"]; //这里写的比较潦草。判断文件名是否为空。
          string type = context.Request.Params["type"]; //在前面JS中不是定义了自定义参数multipart_params的值么。其中有个值是type:"misoft"，此处就可以获取到这个值了。获取到的type="misoft";

          string ext = Path.GetExtension(fileName);
          //fileName = string.Format("{0}{1}", Guid.NewGuid().ToString(), ext);
          filepath = resourceDirectoryName + "/" + fileName;
          fileName = Path.Combine(path, fileName);

          //对文件流进行存储 需要注意的是 files目录必须存在（此处可以做个判断） 根据上面的chunk来判断是块上传还是普通上传 上传方式不一样 ，导致的保存方式也会不一样
          FileStream fs = new FileStream(fileName, chunk == 0 ? FileMode.OpenOrCreate : FileMode.Append);
          //write our input stream to a buffer
          Byte[] buffer = null;
          if (context.Request.ContentType == "application/octet-stream" && context.Request.ContentLength > 0)
          {
            buffer = new Byte[context.Request.InputStream.Length];
            context.Request.InputStream.Read(buffer, 0, buffer.Length);
          }
          else if (context.Request.ContentType.Contains("multipart/form-data") && context.Request.Files.Count > 0 && context.Request.Files[0].ContentLength > 0)
          {
            buffer = new Byte[context.Request.Files[0].InputStream.Length];
            context.Request.Files[0].InputStream.Read(buffer, 0, buffer.Length);
          }

          //write the buffer to a file.
          if (buffer != null)
            fs.Write(buffer, 0, buffer.Length);
          fs.Close();

          statuscode = 1;
          message = "上传成功";

        }
        catch (Exception ex)
        {
          statuscode = -1001;
          message = "保存时发生错误，请确保文件有效且格式正确";

          Util.LogHelper logger = new Util.LogHelper();
          string path = context.Server.MapPath("~/Logs");
          logger.WriteLog(ex.Message, path);
        }
      }
      else
      {
        statuscode = -404;
        message = "上传失败，未接收到资源文件";
      }

      string msg = "{\"statusCode\":\"" + statuscode + "\",\"message\":\"" + message + "\",\"filePath\":\"" + filepath + "\"}";
      context.Response.Write(msg);
    }

    public bool IsReusable
    {
      get
      {
        return false;
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebUI
{
  public partial class CheckHardDiskFreeSpace : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    /// <summary>
    /// 获取磁盘剩余容量
    /// </summary>
    /// <returns></returns>
    [WebMethod]
    public static string GetHardDiskFreeSpace()
    {
      const string strHardDiskName = @"F:\";

      var freeSpace = string.Empty;
      var drives = DriveInfo.GetDrives();
      var myDrive = (from drive in drives
        where drive.Name == strHardDiskName
        select drive).FirstOrDefault();
      if (myDrive != null)
      {
        freeSpace = myDrive.TotalFreeSpace+""; 
      }
      return freeSpace;
    }
  }
}