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HTTP协议下用Web Service上传大文件的解决方案

来源:建站吧 责任编辑:Jzq8 发表时间:2011-12-15 点击:

  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

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:

UploadProcess#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 byte[m_buffer*1024];
      long m_readBytes  = m_fs.Read(m_data, 0, m_buffer*1024);
      this.UploadProcessBar.Maximum  = 100;
      this.UploadProcessBar.Minimum  = 0;
      while(m_readBytes>0)
      {
        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.AppendText("Upload file error.rn");
          m_fs.Close();
          this.m_upload.AbandantUpload(this.m_uploadInstance);
          return;
        }
      }
      this.textBox_OutMsg.AppendText("File upload finished.rn");
      this.button_Cancel.Enabled  = false;
      m_fs.Close();
      this.ResetForm();
    }
    #endregion

  HTTP协议下用Web Service上传大文件的解决方案

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