C# 实现 FTP 上传和下载功能

骆娅贺

using System;
using System.Collections.Generic;
using System.Web;
using System.Net;
using System.IO;
namespace His.WebService.Utility
{
public class FtpHelper
{
/// <summary>
/// ftp方式上传
/// </summary>
public static int UploadFtp(string filePath, string filename, string ftpServerIP, string ftpUserID, string ftpPassword)
{
FileInfo fileInf = new FileInfo(filePath + "\\" + filename);
string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
FtpWebRequest reqFTP;
// Create FtpWebRequest object from the Uri provided
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));
try
{
// Provide the WebPermission Credintials
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
// By default KeepAlive is true, where the control connection is not closed
// after a command is executed.
reqFTP.KeepAlive = false;
// Specify the command to be executed.
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
// Specify the data transfer type.
reqFTP.UseBinary = true;
// Notify the server about the size of the uploaded file
reqFTP.ContentLength = fileInf.Length;
// The buffer size is set to 2kb
int buffLength = 2048;
byte[] buff = new byte[buffLength];
int contentLen;
// Opens a file stream (System.IO.FileStream) to read the file to be uploaded
//FileStream fs = fileInf.OpenRead();
FileStream fs = fileInf.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
// Stream to which the file to be upload is written
Stream strm = reqFTP.GetRequestStream();
// Read from the file stream 2kb at a time
contentLen = fs.Read(buff, 0, buffLength);
// Till Stream content ends
while (contentLen != 0)
{
// Write Content from the file stream to the FTP Upload Stream
strm.Write(buff, 0, contentLen);
contentLen = fs.Read(buff, 0, buffLength);
}
// Close the file stream and the Request Stream
strm.Close();
fs.Close();
return 0;
}
catch (Exception ex)
{
reqFTP.Abort();
//  Logging.WriteError(ex.Message + ex.StackTrace);
return -2;
}
}
/// <summary>
/// ftp方式下载
/// </summary>
public static int DownloadFtp(string filePath, string fileName, string ftpServerIP, string ftpUserID, string ftpPassword)
{
FtpWebRequest reqFTP;
try
{
//filePath = < <The full path where the file is to be created.>>,
//fileName = < <Name of the file to be created(Need not be the name of the file on FTP server).>>
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary = true;
reqFTP.KeepAlive = false;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
long cl = response.ContentLength;
int bufferSize = 2048;
int readCount;
byte[] buffer = new byte[bufferSize];
readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();
return 0;
}
catch (Exception ex)
{
// Logging.WriteError(ex.Message + ex.StackTrace);
// System.Windows.Forms.MessageBox.Show(ex.Message);
return -2;
}
}
}
}转自：http://www.cnblogs.com/wang726zq/archive/2012/07/30/ftp.html，向原作者致敬！！