webbuploadstatushandler.cs

asp.net 大文件上传,带进度条的时时显示进度效果

using System;
using System.Text;
using System.Web;
using System.IO;

namespace Webb.WAVE.Controls.Upload
{
	/// <summary>
	/// 
	/// </summary>
	internal class WebbUploadStatusHandler : IHttpHandler
	{
		/// <summary>
		/// Implement from IHttphanders
		/// </summary>
		public bool IsReusable
		{
			get { return true; }
		}

		public WebbUploadStatusHandler()
		{
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="uploadGUID"></param>
		public void InitProgress(string i_uploadGUID)
		{
			HttpContext context;
			UploadStatus m_uploadStatus		= new UploadStatus();
			m_uploadStatus.GetUploadStatus(i_uploadGUID);
			StringBuilder sb = WebbHelper.GetHtml("Progress.page");
			//While files were uploading, update the state.
			if (m_uploadStatus.IsActive)
			{
				switch (m_uploadStatus.Status)
				{
					case UploadStatus.UploadState.Initializing:	sb.Replace("${status}$", "Initializtion...");	break;
					case UploadStatus.UploadState.Uploading:	sb.Replace("${status}$", "Uploading...");		break;
					case UploadStatus.UploadState.Uploaded:		sb.Replace("${status}$", "Upload completed.");	break;
					case UploadStatus.UploadState.Moving:		sb.Replace("${status}$", "Moving file...");		break;
					case UploadStatus.UploadState.Completed:	sb.Replace("${status}$", "Finished.");			break;
				}
				//WebbTextTrace.TraceMsg(sb.ToString());
				this.ReviewStatus(m_uploadStatus, sb, i_uploadGUID);
			}
			else
			{
				sb.Replace("${Script}$", "<script>window.opener=self;window.close();</script>");
			}
			context = WebbHelper.GetContext();
			//Clear the cache of client browser.
			context.Response.Expires = 0;
			context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
			context.Response.ContentEncoding	= Encoding.Default;
			context.Response.ContentType		= "text/html";
			context.Response.Clear();
			//Show page to client.
			context.Response.Write(sb.ToString());
		}

		/// <summary>
		/// Update current upload status.
		/// </summary>
		/// <param name="uploadStatus"></param>
		/// <param name="builder"></param>
		/// <param name="uploadGUID"></param>
		private void ReviewStatus(UploadStatus uploadStatus, StringBuilder builder, string uploadGUID)
		{
			if (uploadStatus.Status == UploadStatus.UploadState.Uploading)
			{
				builder.Replace("${FileName}$", Path.GetFileName(uploadStatus.FileName));
				builder.Replace("${UploadProgress}$", uploadStatus.Percent.ToString());
				builder.Replace("${SurplusProgress}$", Convert.ToString(100 - uploadStatus.Percent));
				builder.Replace("${UploadSpeed}$", (WebbHelper.GetFormatString(uploadStatus.Speed) + "/s"));
				builder.Replace("${LeftTime}$", WebbHelper.GetFormatString(uploadStatus.LeftTime));
				builder.Replace("${BtnOK}$", "disabled");
				builder.Replace("${Refresh}$", ("<meta http-equiv=\"Refresh\" content=\"2\";URL=progress.ashx?UploadGUID="+uploadGUID+"\">"));
			}
			else if (uploadStatus.Status == UploadStatus.UploadState.Completed)
			{
				builder.Replace("${UploadProgress}$", uploadStatus.Percent.ToString());
				builder.Replace("${SurplusProgress}$", Convert.ToString(100 - uploadStatus.Percent));

				builder.Replace("${FileName}$", (uploadStatus.FileCount.ToString() + "file(s) uploaded success!"));
				builder.Replace("${UploadSpeed}$", (WebbHelper.GetFormatString(uploadStatus.Speed) + "/s"));
				builder.Replace("${LeftTime}$", "finished, no time remain!");

				uploadStatus.Dispose();
				builder.Replace("${BtnOK}$", "onclick=\"javascript:window.opener=self;window.close();return false;\"");
				builder.Replace("${Refresh}$", "");
			}
			else
			{
				builder.Replace("${FileName}$", "Loading...");
				builder.Replace("${UploadProgress}$", "0");
				builder.Replace("${SurplusProgress}$", "100");
				builder.Replace("${UploadSpeed}$", (WebbHelper.GetFormatString(uploadStatus.Speed) + "/s"));
				builder.Replace("${LeftTime}$", "0 second(s)");
				builder.Replace("${BtnOK}$", "disabled");
				builder.Replace("${Refresh}$", ("<meta http-equiv=\"Refresh\" content=\"1\";URL=progress.ashx?UploadID=" + uploadGUID + "\">"));
			}

			if (uploadStatus.Status == UploadStatus.UploadState.Completed)
			{
				builder.Replace("${BtnCancel}$", "onclick=\"javascript:window.opener=self;window.close();return false;\"");
			}
			else
			{
				if(WebbHelper.IsAccordantBrowser())
				{
					builder.Replace("${BtnCancel}$", "onclick=\"javascript:dialogArguments.location.href=dialogArguments.location.href;window.close();\"");					
				}
				else
				{
					builder.Replace("${BtnCancel}$", "onclick=\"javascript:window.opener.opener=null;window.opener.location.href=window.opener.location.href;window.close();this.disabled=true;\"");
				}
			}

			builder.Replace("${Script}$", "");
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="context"></param>
		public void ProcessRequest(HttpContext context)
		{
			string m_uploadID	= context.Request.QueryString["UploadGUID"];
			string m_filePath	= context.Request.FilePath;
			m_filePath			= m_filePath.Substring((m_filePath.LastIndexOf("/") + 1)).ToUpper();
//			bool isUnknownRequest = false;
			if (m_filePath=="PROGRESS.ASHX")
			{
				this.InitProgress(m_uploadID);
			}
//			The IIS can solve this problem
//			else
//			{
//				isUnknownRequest = true;
//			}
//
//			if (isUnknownRequest)
//			{
//				throw new HttpException(500, "unknown request");
//			}
		}
	}
}