借助WebService實現多線程上傳文件

在WebService的幫助下,進行多線程上傳文件是非常簡單。因此我只做個簡單的例子,那麽如果想要實現此功能的朋友,可以在我的基礎上進行擴展。

首先說說服務器端,只需要提供一個能允許多線程寫文件的函數即可,具體代碼如下。view plaincopy to clipboardprint?

[WebMethod]

public bool UploadFileData( string FileName, int StartPosition, byte[] bData )

{

string strFullName = Server.MapPath( "Uploads" ) + @"\" + FileName;

FileStream fs = null;

try

{

fs = new FileStream( strFullName, FileMode.OpenOrCreate,

FileAccess.Write, FileShare.Write );

}

catch( IOException err )

{

Session["ErrorMessage"] = err.Message;

return false;

}

using( fs )

{

fs.Position = StartPosition;

fs.Write( bData, 0, bData.Length );

}

return true;

}

[WebMethod]

public bool UploadFileData( string FileName, int StartPosition, byte[] bData )

{

string strFullName = Server.MapPath( "Uploads" ) + @"\" + FileName;

FileStream fs = null;

try

{

fs = new FileStream( strFullName, FileMode.OpenOrCreate,

FileAccess.Write, FileShare.Write );

}

catch( IOException err )

{

Session["ErrorMessage"] = err.Message;

return false;

}

using( fs )

{

fs.Position = StartPosition;

fs.Write( bData, 0, bData.Length );

}

return true;

}其中“Uploads”是在服務程序所在目錄下的一個子目錄,需要設置ASPNET用戶對此目錄具有可寫權限。

相對于服務器端來說,客戶端要稍微複雜一些,因爲要牽扯到多線程的問題。爲了更好的傳遞參數,我用一個線程類來完成。具體如下。view plaincopy to clipboardprint?

public delegate void UploadFileData( string FileName, int StartPos, byte[] bData );

/// <summary>

/// FileThread: a class for sub-thread

/// </summary>

sealed class FileThread

{

private int nStartPos;

private int nTotalBytes;

private string strFileName;

public static UploadFileData UploadHandle;

/// <summary>

/// Constructor

/// </summary>

/// <param name="StartPos"></param>

/// <param name="TotalBytes"></param>

/// <param name="FileName"></param>

public FileThread( int StartPos, int TotalBytes, string FileName )

{

//Init thread variant

nStartPos = StartPos;

nTotalBytes = TotalBytes;

strFileName = FileName;

//Only for debug

Debug.WriteLine( string.Format( "File name:{0} position: {1} total byte:{2}",

strFileName, nStartPos, nTotalBytes ) );

}

/// <summary>

/// Sub-thread entry function

/// </summary>

/// <param name="stateinfo"></param>

public void UploadFile( object stateinfo )

{

int nRealRead, nBufferSize;

const int BUFFER_SIZE = 10240;

using( FileStream fs = new FileStream( strFileName,

FileMode.Open, FileAccess.Read,

FileShare.Read ) )

{

string sName = strFileName.Substring( strFileName.LastIndexOf( "\\" ) + 1 );

byte[] bBuffer = new byte[BUFFER_SIZE];//Init 10k buffer

fs.Position = nStartPos;

nRealRead = 0;

do

{

nBufferSize = BUFFER_SIZE;

if( nRealRead + BUFFER_SIZE > nTotalBytes )

nBufferSize = nTotalBytes - nRealRead;

nBufferSize = fs.Read( bBuffer, 0, nBufferSize );

if( nBufferSize == BUFFER_SIZE )

UploadHandle( sName,

nRealRead + nStartPos,

bBuffer );

else if( nBufferSize > 0 )

{

//Copy data

byte[] bytData = new byte[nBufferSize];

Array.Copy( bBuffer,0, bytData, 0, nBufferSize );

UploadHandle( sName,

nRealRead + nStartPos,

bytData );

}

nRealRead += nBufferSize;

}

while( nRealRead < nTotalBytes );

}

//Release signal

ManualResetEvent mr = stateinfo as ManualResetEvent;

if( mr != null )

mr.Set();

}

}

public delegate void UploadFileData( string FileName, int StartPos, byte[] bData );

/// <summary>

/// FileThread: a class for sub-thread

/// </summary>

sealed class FileThread

{

private int nStartPos;

private int nTotalBytes;

private string strFileName;

public static UploadFileData UploadHandle;

/// <summary>

/// Constructor

/// </summary>

/// <param name="StartPos"></param>

/// <param name="TotalBytes"></param>

/// <param name="FileName"></param>

public FileThread( int StartPos, int TotalBytes, string FileName )

{

//Init thread variant

nStartPos = StartPos;

nTotalBytes = TotalBytes;

strFileName = FileName;

//Only for debug

Debug.WriteLine( string.Format( "File name:{0} position: {1} total byte:{2}",

strFileName, nStartPos, nTotalBytes ) );

}

/// <summary>

/// Sub-thread entry function

/// </summary>

/// <param name="stateinfo"></param>

public void UploadFile( object stateinfo )

{

int nRealRead, nBufferSize;

const int BUFFER_SIZE = 10240;

using( FileStream fs = new FileStream( strFileName,

FileMode.Open, FileAccess.Read,

FileShare.Read ) )

{

string sName = strFileName.Substring( strFileName.LastIndexOf( "\\" ) + 1 );

byte[] bBuffer = new byte[BUFFER_SIZE];//Init 10k buffer

fs.Position = nStartPos;

nRealRead = 0;

do

{

nBufferSize = BUFFER_SIZE;

if( nRealRead + BUFFER_SIZE > nTotalBytes )

nBufferSize = nTotalBytes - nRealRead;

nBufferSize = fs.Read( bBuffer, 0, nBufferSize );

if( nBufferSize == BUFFER_SIZE )

UploadHandle( sName,

nRealRead + nStartPos,

bBuffer );

else if( nBufferSize > 0 )

{

//Copy data

byte[] bytData = new byte[nBufferSize];

Array.Copy( bBuffer,0, bytData, 0, nBufferSize );

UploadHandle( sName,

nRealRead + nStartPos,

bytData );

}

nRealRead += nBufferSize;

}

while( nRealRead < nTotalBytes );

}

//Release signal

ManualResetEvent mr = stateinfo as ManualResetEvent;

if( mr != null )

mr.Set();

}

}那麽在執行的時候,要創建線程類對象,並爲每一個每個線程設置一個信號量,從而能在所有線程都結束的時候得到通知,大致的代碼如下。view plaincopy to clipboardprint?

FileInfo fi = new FileInfo( txtFileName.Text );

if( fi.Exists )

{

btnUpload.Enabled = false;//Avoid upload twice

//Init signals

ManualResetEvent[] events = new ManualResetEvent[5];

//Devide blocks

int nTotalBytes = (int)( fi.Length / 5 );

for( int i = 0; i < 5; i++ )

{

events[i] = new ManualResetEvent( false );

FileThread thdSub = new FileThread(

i * nTotalBytes,

( fi.Length - i * nTotalBytes ) > nTotalBytes ? nTotalBytes:(int)( fi.Length - i * nTotalBytes ),

fi.FullName );

ThreadPool.QueueUserWorkItem( new WaitCallback( thdSub.UploadFile ), events[i] );

}

//Wait for threads finished

WaitHandle.WaitAll( events );

//Reset button status

btnUpload.Enabled = true;

}

FileInfo fi = new FileInfo( txtFileName.Text );

if( fi.Exists )

{

btnUpload.Enabled = false;//Avoid upload twice

//Init signals

ManualResetEvent[] events = new ManualResetEvent[5];

//Devide blocks

int nTotalBytes = (int)( fi.Length / 5 );

for( int i = 0; i < 5; i++ )

{

events[i] = new ManualResetEvent( false );

FileThread thdSub = new FileThread(

i * nTotalBytes,

( fi.Length - i * nTotalBytes ) > nTotalBytes ? nTotalBytes:(int)( fi.Length - i * nTotalBytes ),

fi.FullName );

ThreadPool.QueueUserWorkItem( new WaitCallback( thdSub.UploadFile ), events[i] );

}

//Wait for threads finished

WaitHandle.WaitAll( events );

//Reset button status

btnUpload.Enabled = true;

}總體來說,程序還是相對比較簡單,而我也只是做了個簡單例子而已,一些細節都沒有進行處理。

如下是客戶端的完整代碼。view plaincopy to clipboardprint?

//--------------------------- Multi-thread Upload Demo ---------------------------------------

//--------------------------------------------------------------------------------------------

//---File: frmUpload

//---Description: The multi-thread upload form file to demenstrate howto use multi-thread to

// upload files

//---Author: Knight

//---Date: Oct.12, 2006

//--------------------------------------------------------------------------------------------

//---------------------------{Multi-thread Upload Demo}---------------------------------------

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

namespace CSUpload

{

using System.IO;

using System.Diagnostics;

using System.Threading;

using WSUploadFile;//Web-service reference namespace

/// <summary>

/// Summary description for Form1.

/// </summary>

public class frmUpload : System.Windows.Forms.Form

{

private System.Windows.Forms.TextBox txtFileName;

private System.Windows.Forms.Button btnBrowse;

private System.Windows.Forms.Button btnUpload;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

public frmUpload()

{

//

// Required for Windows Form Designer support

//

InitializeComponent();

//

// TODO: Add any constructor code after InitializeComponent call

//

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows Form Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.txtFileName = new System.Windows.Forms.TextBox();

this.btnBrowse = new System.Windows.Forms.Button();

this.btnUpload = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// txtFileName

//

this.txtFileName.Location = new System.Drawing.Point(16, 24);

this.txtFileName.Name = "txtFileName";

this.txtFileName.Size = new System.Drawing.Size(248, 20);

this.txtFileName.TabIndex = 0;

this.txtFileName.Text = "";

//

// btnBrowse

//

this.btnBrowse.Location = new System.Drawing.Point(272, 24);

this.btnBrowse.Name = "btnBrowse";

this.btnBrowse.TabIndex = 1;

this.btnBrowse.Text = "&Browse...";

this.btnBrowse.Click += new System.EventHandler(this.btnBrowse_Click);

//

// btnUpload

//

this.btnUpload.Location = new System.Drawing.Point(272, 56);

this.btnUpload.Name = "btnUpload";

this.btnUpload.TabIndex = 2;

this.btnUpload.Text = "&Upload";

this.btnUpload.Click += new System.EventHandler(this.btnUpload_Click);

//

// frmUpload

//

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

this.ClientSize = new System.Drawing.Size(370, 111);

this.Controls.Add(this.btnUpload);

this.Controls.Add(this.btnBrowse);

this.Controls.Add(this.txtFileName);

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;

this.MaximizeBox = false;

this.Name = "frmUpload";

this.Text = "Upload";

this.Load += new System.EventHandler(this.frmUpload_Load);

this.ResumeLayout(false);

}

#endregion

/// <summary>

/// The main entry point for the application.

/// </summary>

static void Main()

{

Application.Run(new frmUpload());

}

private FileUpload myUpload = new FileUpload();

private void UploadData( string FileName, int StartPos, byte[] bData )

{

//Call web service upload

myUpload.UploadFileData( FileName, StartPos, bData );

}

private void btnUpload_Click(object sender, System.EventArgs e)

{

FileInfo fi = new FileInfo( txtFileName.Text );

if( fi.Exists )

{

btnUpload.Enabled = false;//Avoid upload twice

//Init signals

ManualResetEvent[] events = new ManualResetEvent[5];

//Devide blocks

int nTotalBytes = (int)( fi.Length / 5 );

for( int i = 0; i < 5; i++ )

{

events[i] = new ManualResetEvent( false );

FileThread thdSub = new FileThread(

i * nTotalBytes,

( fi.Length - i * nTotalBytes ) > nTotalBytes ? nTotalBytes:(int)( fi.Length - i * nTotalBytes ),

fi.FullName );

ThreadPool.QueueUserWorkItem( new WaitCallback( thdSub.UploadFile ), events[i] );

}

//Wait for threads finished

WaitHandle.WaitAll( events );

//Reset button status

btnUpload.Enabled = true;

}

}

private void frmUpload_Load(object sender, System.EventArgs e)

{

FileThread.UploadHandle = new UploadFileData( this.UploadData );

}

private void btnBrowse_Click(object sender, System.EventArgs e)

{

if( fileOpen.ShowDialog() == DialogResult.OK )

txtFileName.Text = fileOpen.FileName;

}

private OpenFileDialog fileOpen = new OpenFileDialog();

}

public delegate void UploadFileData( string FileName, int StartPos, byte[] bData );

/// <summary>

/// FileThread: a class for sub-thread

/// </summary>

sealed class FileThread

{

private int nStartPos;

private int nTotalBytes;

private string strFileName;

public static UploadFileData UploadHandle;

/// <summary>

/// Constructor

/// </summary>

/// <param name="StartPos"></param>

/// <param name="TotalBytes"></param>

/// <param name="FileName"></param>

public FileThread( int StartPos, int TotalBytes, string FileName )

{

//Init thread variant

nStartPos = StartPos;

nTotalBytes = TotalBytes;

strFileName = FileName;

//Only for debug

Debug.WriteLine( string.Format( "File name:{0} position: {1} total byte:{2}",

strFileName, nStartPos, nTotalBytes ) );

}

/// <summary>

/// Sub-thread entry function

/// </summary>

/// <param name="stateinfo"></param>

public void UploadFile( object stateinfo )

{

int nRealRead, nBufferSize;

const int BUFFER_SIZE = 10240;

using( FileStream fs = new FileStream( strFileName,

FileMode.Open, FileAccess.Read,

FileShare.Read ) )

{

string sName = strFileName.Substring( strFileName.LastIndexOf( "\\" ) + 1 );

byte[] bBuffer = new byte[BUFFER_SIZE];//Init 10k buffer

fs.Position = nStartPos;

nRealRead = 0;

do

{

nBufferSize = BUFFER_SIZE;

if( nRealRead + BUFFER_SIZE > nTotalBytes )

nBufferSize = nTotalBytes - nRealRead;

nBufferSize = fs.Read( bBuffer, 0, nBufferSize );

if( nBufferSize == BUFFER_SIZE )

UploadHandle( sName,

nRealRead + nStartPos,

bBuffer );

else if( nBufferSize > 0 )

{

//Copy data

byte[] bytData = new byte[nBufferSize];

Array.Copy( bBuffer,0, bytData, 0, nBufferSize );

UploadHandle( sName,

nRealRead + nStartPos,

bytData );

}

nRealRead += nBufferSize;

}

while( nRealRead < nTotalBytes );

}

//Release signal

ManualResetEvent mr = stateinfo as ManualResetEvent;

if( mr != null )

mr.Set();

}

}

}

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