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 Instance
复制代码 代码如下: using System; using System.IO; using Microsoft.Web.Services2; using Microsoft.Web.Services2.Dime;
namespace Webb.WAVE.WinUpload { /**//// <summary> /// Summary description for Controls. /// </summary> public class UploadInstance2 { Fields#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
Properties#region Properties public long UserID { get{return this.m_userID;} set{this.m_userID=value;} } public string GUID { get{return this.m_GUID;} set{this.m_GUID=value;} } public DateTime UploadTime { get{return this.m_uploadTime;} set{} } public long FileLength { get{return this.m_fileLength;} set{this.m_fileLength=value;} } public long CurrentPoing { get{return this.m_currentPoint;} set{this.m_currentPoint=value;} } public string PathOnServer { get{return this.m_pathOnserver;} set{this.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; try{File.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:
复制代码 代码如下: (编辑:焦作站长网)
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