大文件上传 进度条显示（仿CSDN资源上传效果）

浏览-选择文件-点击 “上传 ”后，效果如下：

弹出透明UI遮罩层 并显示上传这个过程 我这里设置太透明了 效果不是很立体

文件结构如图：

说明：用到“高山来客”的大文件上传组件 http://www.cnblogs.com/bashan/archive/2008/05/23/1206095.html

以及Newtonsoft.Json.dll Json字符串反序列化为对象 http://james.newtonking.com/projects/json-net.aspx

jquery.blockUI.js 弹出透明遮罩层 http://malsup.com/jquery/block/

jquery.form.js   表单验证Ajax提交 

参照了“蚂蚁飞了”的文章 多谢多谢 http://blog.csdn.net/jetsteven

HTML：

<form id="uploadForm" runat="server" enctype="multipart/form-data">
  <div id="uploadfield"  style="600px; height:500px">
   <input id="File1" type="file" runat="server" />
   <asp:Button ID="Button1" runat="server"  Text="上传" onclick="Button1_Click" />
    <p>文件上传进度条</p>
    <p>文件上传进度条</p>
    <p>文件上传进度条</p>
    <p>文件上传进度条</p>
    <p>文件上传进度条</p>
    <p>文件上传进度条</p>
     <p>文件上传进度条</p>
   </div>                 
  <div id="ui"  style="display:none"  >  
   <div id="output" > </div>    
   <div id="progressbar"class="ui-progressbar ui-widget ui-widget-content ui-corner-all" style="296px; height:20px;"></div>
   <input id="btn_cancel" type="button" value="取消上传" />
  </div>
</form>

js:

var inte;
$(function() {
$('#uploadForm').submit(function() {
    return false;
});

$('#uploadForm').ajaxForm({ //这里调用jquery.form.js表单注册方法
    beforeSubmit: function(a, f, o) {//提交前的处理
        o.dataType = "json";
        $('#uploadfield').block({ message: $('#ui'), css: {  '300px', border: '#b9dcfe 1px solid',padding: '0.5em 0.2em'  }
        });
        inte = self.setInterval("getprogress()", 500);
    }
});

$('#btn_cancel').click(function() {
    var uploadid = $("#UploadID").val();
    $.ajax({
        type: "POST",
        dataType: "json",
        async: false, //ajax的请求时同步 只有一个线程
        url: "upload_ajax.ashx",
        data: "UploadID=" + uploadid + "&cancel=true",
        success: function(obj) {
            $("#output").html(obj.msg);
            inte = self.clearInterval(inte);
            $('#uploadfield').unblock(); 
            
             }
    });
});
});

function getprogress() {
var uploadid = $("#UploadID").val()
$.ajax({
    type: "POST",
    dataType: "json",
    async: false,
    url: "upload_ajax.ashx",
    data: "UploadID=" + uploadid,
    success: function(obj) {
    var p = obj.msg.Readedlength / obj.msg.TotalLength * 100;
    var info = "<FONT color=Green> 当前上传文件:</FONT>" + obj.msg.CurrentFile;
    info += "<br><FONT color=Green>" + obj.msg.FormatStatus + ":</FONT>" + obj.msg.Status;
    info += "<br><FONT color=Green>文件大小:</FONT>" + obj.msg.TotalLength;
    info += "<br><FONT color=Green>速度:</FONT>" + obj.msg.FormatRatio;
    info += "<br><FONT color=Green>剩余时间:</FONT>" + obj.msg.LeftTime;


    $("#output").html(info);
    $("#progressbar").progressbar({ value: 0 }); //初始化
    $("#progressbar").progressbar("option", "value", p);
    $("#progressbar div").html(p.toFixed(2) + "%");
    $("#progressbar div").addClass("percentText");
    if (obj.msg.Status == 4) {
        inte = self.clearInterval(inte);
        $('#uploadfield').unblock(); 
    }
      
    }
});
}

交互过程代码：

<%@ WebHandler Language="C#" Class="progressbar" %>

using System;
using System.Web;

using BigFileUpload;//大文件引用命名空间
using Newtonsoft.Json;//对象到JSON的相互转换
using System.Text.RegularExpressions;//正则

public class progressbar : IHttpHandler {
    
private string template = "{{statue:'{0}',msg:{1}}}";   
public void ProcessRequest(HttpContext context)   
{   
    context.Response.ContentType = "text/plain";   
    try  
    {   
    string guid = context.Request["UploadID"];   
    string cancel =context.Request["cancel"];
    UploadContext c = UploadContextFactory.GetUploadContext(guid);  
    if (!string.IsNullOrEmpty(cancel))
    {           
        c.Abort=true;
          
        throw new Exception("用户取消");   
    }   
    string json = Newtonsoft.Json.JsonConvert.SerializeObject(c);   
           
    WriteResultJson(1, json, context,template);
           
    }catch (Exception err)   
    {   
        WriteResultJson(0, err.Message, context);   
    }   
}

  

public static void WriteResultJson(int resultno, string description, HttpContext context)
{
    WriteResultJson(resultno, description, context, "{{statue:'{0}',msg:'{1}'}}");
}

public static void WriteResultJson(int resultno, string description, HttpContext context, string template)
{
    description = ClearBR(ReplaceString(description, "'", "|", false));
    context.Response.Write(string.Format(template, resultno, description));
}

public static string ClearBR(string str)
{
    Regex r = null;
    Match m = null;
    r = new Regex(@"(\r|\n)", RegexOptions.IgnoreCase);
    for (m = r.Match(str); m.Success; m = m.NextMatch())
    {
        str = str.Replace(m.Groups[0].ToString(), @"\n");
    }
    return str;
}

public static string ReplaceString(string SourceString, string SearchString, string ReplaceString, bool IsCaseInsensetive)
{
    return Regex.Replace(SourceString, Regex.Escape(SearchString), ReplaceString, IsCaseInsensetive ? RegexOptions.IgnoreCase : RegexOptions.None);
}
  
public bool IsReusable   
{   
    get  
    {
        return false;   
    }   
} 
}