C# FileStream进行FTP服务上传文件和下载文件

定义FileStream类的操作类:操作类名: FtpUpDown

上传文件

/// <summary>

/// 上传文件

/// </summary>

/// <param name="localpath">上传文件的全路径 例@"D:\123.txt"</param>

/// <param name="ftppath"></param>

/// <returns></returns>

public bool Upload(string localpath, string ftppath)

{

bool bol = false;

try

{

FileInfo fileInf = new FileInfo(localpath);

//替换符号

ftppath = ftppath.Replace("\\", "/");

//组合ftp上传文件路径

string uri = "ftp://" + ftppath + "/" + fileInf.Name;

// 根据uri创建FtpWebRequest对象

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

// 指定数据传输类型

reqFTP.UseBinary = true;

// ftp用户名和密码

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// 默认为true，连接不会被关闭

// 在一个命令之后被执行

reqFTP.KeepAlive = false;

// 指定执行什么命令

reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

// 上传文件时通知服务器文件的大小

reqFTP.ContentLength = fileInf.Length;

// 缓冲大小设置为kb

int buffLength = 2048;

byte[] buff = new byte[buffLength];

int contentLen;

// 打开一个文件流(System.IO.FileStream) 去读上传的文件

FileStream fs = fileInf.OpenRead();

try

{

// 把上传的文件写入流

Stream strm = reqFTP.GetRequestStream();

// 每次读文件流的kb

contentLen = fs.Read(buff, 0, buffLength);

// 流内容没有结束

while (contentLen != 0)

{

// 把内容从file stream 写入upload stream

strm.Write(buff, 0, contentLen);

contentLen = fs.Read(buff, 0, buffLength);

bol = true;

}

// 关闭两个流

strm.Close();

fs.Close();

}

catch (Exception ex)

{

MessageBox.Show("上传文件失败，失败原因；" + ex.Message);

}

}

catch (Exception ex)

{

MessageBox.Show("上传文件失败，失败原因；" + ex.Message);

}

return bol;

}

下载文件:

/// <summary>

/// 下载文件

/// </summary>

/// <param name="localpath"></param>

/// <param name="fileName"></param>

/// <param name="errorinfo"></param>

/// <returns></returns>

public bool Download(string localpath, string fileName, out string errorinfo)

{

try

{

String onlyFileName = Path.GetFileName(fileName);

string newFileName = localpath + "\\" + onlyFileName;

if (File.Exists(newFileName))

{

errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);

return false;

}

string url = "ftp://" + ftpServerIP + "/FileInfo/" + fileName;

// 根据uri创建FtpWebRequest对象

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));

// 指定数据传输类型

reqFTP.UseBinary = true;

// ftp用户名和密码

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);

FileStream outputStream = new FileStream(newFileName, FileMode.Create, FileAccess.Write);

while (readCount > 0)

{

outputStream.Write(buffer, 0, readCount);

readCount = ftpStream.Read(buffer, 0, bufferSize);

}

ftpStream.Close();

outputStream.Close();

response.Close();

errorinfo = "";

return true;

}

catch (Exception ex)

{

errorinfo = string.Format("因{0},无法下载", ex.Message);

return false;

}

}

调用方法：

/// <summary>

/// 上传

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void Button_Click_1(object sender, RoutedEventArgs e)

{

FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);

string localpath = @"D:\123.txt";

string ftppath =  ftpServerIP + @"\FileInfo";

bool bol = ftp.Upload(localpath, ftppath);

if (bol == true)

MessageBox.Show("上传成功");

else

MessageBox.Show("上传失败");

}

/// <summary>

/// 下载

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void Button_Click_2(object sender, RoutedEventArgs e)

{

string errorinfo;

string localpath = @"E:\qzq\FileInfo";

if (!Directory.Exists(localpath))

{

Directory.CreateDirectory(localpath);

}

string filename = "123.txt";

if (!File.Exists(localpath + "\\" + filename))

{

FtpUpDown ftp = new FtpUpDown(ftpServerIP, ftpUserID, ftpPassword);

bool bol = ftp.Download(localpath, filename, out errorinfo);

if (bol == true)

MessageBox.Show("下载成功");

else

MessageBox.Show("下载失败：" + errorinfo + "");

}

else

{

MessageBox.Show("下载文件已存在!");

}

}

其中: ftpServerIP:上传服务的IP地址。

ftpUserID: 上传服务的登录名。

ftpPassword: 上传服务的密码。