大文件上传进度条显示代码,Asp.Net代码库,德仔网

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【Asp.Net】大文件上传进度条显示
作者:昊强 / 发布于2016/1/8/ 721

	说明：用到&ldquo;高山来客&rdquo;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&ldquo;蚂蚁飞了&rdquo;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="width:600px; height:500px">
	 <input id="File1" type="file" runat="server" />
	 <asp:Button ID="Button1" runat="server" Text="上传" onclick="Button1_Click" />
	 文件上传进度条
	 文件上传进度条
	 文件上传进度条
	 文件上传进度条
	 文件上传进度条
	 文件上传进度条
	 文件上传进度条
	 </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="width: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: { width: '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 += "<FONT color=Green>" + obj.msg.FormatStatus + ":</FONT>" + obj.msg.Status;
	 info += "<FONT color=Green>文件大小:</FONT>" + obj.msg.TotalLength;
	 info += "<FONT color=Green>速度:</FONT>" + obj.msg.FormatRatio;
	 info += "<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;
	 }
	}
	}
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