http协议下用Web Service上传大文件的解决方案.doc

用HTTP协议上传大文件也许是个不好办的问题。主要是它的不连续性，使得上传文件感觉很“危险”。特别是很大的文件(几百MB甚至是上G的文件)，心里总觉得不踏实，一不小心就会出现问题，而一但出现问题就无法继续上传，这是很郁闷的。后来在一些网站上找到一些上传文件的组件，但都是要用到一些COM组件。至于后来的ASP.net下上传大文件的解决方案，我也做过一个组件，后来发现根本就不用自己写什么组件，利用ASP.net自己的上传方法也可以解决大文件上传，真是郁闷的要死了。回想之后，决定用Web service来做一个文件上传，还是利用HTTP协议，这样不用在服务器上做太多的变动，而客户端也简单。首先是解决方案的设计：因为Web service可以利用SOAP来传递数据，而且可以传递十进制数据，因此可以想到，在服务上公开一个方法，参数可以是byte数组，这样可以把文件分块的上传到服务器。这一解决方法我做过，但速度很慢。后来在MS上找到一些文章，用MS最新公开的服务组件上传文件，速度快了很多。而自己所要做的就是组织一些安全性的问题。部份代码：Upload Instanceusing System;using System.IO;using Microsoft.Web.Services2;using Microsoft.Web.Services2.Dime;namespace Webb.WAVE.WinUpload / / Summary description for Controls. / public class UploadInstance2 #region Fields private string m_GUID; private DateTime m_uploadTime; private long m_fileLength; private long m_currentPoint; private string m_pathOnserver; private long m_userID; #endregion #region Properties public long UserID getreturn this.m_userID; setthis.m_userID=value; public string GUID getreturn this.m_GUID; setthis.m_GUID=value; public DateTime UploadTime getreturn this.m_uploadTime; set public long FileLength getreturn this.m_fileLength; setthis.m_fileLength=value; public long CurrentPoing getreturn this.m_currentPoint; setthis.m_currentPoint=value; public string PathOnServer getreturn this.m_pathOnserver; setthis.m_pathOnserver=value; public string FullPathOnServer get if(this.m_GUID!=string.Empty&this.m_pathOnserver!=string.Empty) return Path.Combine(this.m_pathOnserver,this.m_GUID+.rem); else return string.Empty; public string FileName get if(this.m_GUID!=string.Empty) return this.m_GUID+.rem; else return string.Empty; #endregion public UploadInstance2() this.m_GUID = System.Guid.NewGuid().ToString(); this.m_uploadTime = System.DateTime.Now; this.m_currentPoint = 0; this.m_fileLength = 0; this.m_pathOnserver = string.Empty; public UploadInstance2(string i_path,string i_GUID,long i_fileLength) string m_fullPath = Path.Combine(i_path,i_GUID); if(!File.Exists(m_fullPath) return; this.m_GUID = i_GUID; this.m_uploadTime = System.DateTime.Now; this.m_pathOnserver = i_path; FileInfo m_fileInfo = new FileInfo(m_fullPath); this.m_currentPoint = m_fileInfo.Length; this.m_fileLength = i_fileLength; public bool UploadData(byte i_data, long i_currentPoint, int i_dataSize) string m_fullPath = this.FullPathOnServer; if(!File.Exists(m_fullPath)&this.m_currentPoint!=0)return false; long m_filePoint = new FileInfo(m_fullPath).Length; if(m_filePoint!=i_currentPoint) return false; FileStream m_fileStream = new FileStream(m_fullPath,FileMode.Append); m_fileStream.Write(i_data,0,i_dataSize); m_fileStream.Close(); return true; public void AbandantUpload() string m_fullPath = this.FullPathOnServer; tryFile.Delete(m_fullPath); catch public void CreateFile() string m_fullPath = this.FullPathOnServer; if(!File.Exists(m_fullPath) File.Create(m_fullPath).Close(); else try File.Delete(m_fullPath); catch File.Create(m_fullPath).Close(); 上传过程：#region UploadProcess public void UploadProcess() DateTime m_start = DateTime.Now; this.textBox_OutMsg.AppendText(Initialize uploadrn); if(this.m_upload=null|this.m_uploadGUID=null|this.m_uploadGUID=string.Empty) this.textBox_OutMsg.AppendText(Upload instance id error or login to the server faildrn); this.textBox_OutMsg.AppendText(Upload faild.rn); return; this.textBox_OutMsg.AppendText(Open filern); if(this.m_filePath=null|this.m_filePath=string.Empty|!File.Exists(this.m_filePath) this.textBox_OutMsg.AppendText(Open file errorrn); this.textBox_OutMsg.AppendText(Upload faild.rn); return; FileInfo m_fileInfo = new FileInfo(this.m_filePath); FileStream m_fs = new FileStream(this.m_filePath, FileMode.Open, FileAccess.Read); this.textBox_OutMsg.AppendText(Start upload filern); int m_buffer = 10; /KBytes long m_currentPoint = 0; long m_fileLength = m_fileInfo.Length; bool m_uploadResult = false; byte m_data = new bytem_buffer*1024; long m_readBytes = m_fs.Read(m_data, 0, m_buffer*1024); this.UploadProcessBar.Maximum = 100; this.UploadProcessBar.Minimum = 0; while(m_readBytes0) MemoryStream m_memoryStream = new MemoryStream(m_data, 0,(int)m_readBytes); DimeAttachment dimeAttach = new DimeAttachment(image/gif, TypeFormat.MediaType, m_memoryStream); this.m_upload.RequestSoapContext.Attachments.Add(dimeAttach); m_uploadResult = this.m_upload.UploadFileData(this.m_uploadInstance,m_currentPoint,m_readBytes); if(m_uploadResult) m_currentPoint +=m_readBytes; m_readBytes = m_fs.Read(m_data,0,m_buffer*1024); / this.textBox_OutMsg.AppendText(Uploading:+m_currentPoint.ToString()+/+m_fileLength.ToString()+rn); this.UploadProcessBar.Value = (int)(m_currentPoint*100/m_fileLength); this.label_outPercent.Text = this.UploadProcessBar.Value.ToString()+%; else this.textBox_OutMsg.Ap