C# FTP上传下载（支持断点续传）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace JianKunKing.Common.Ftp
{
/// <summary>
/// ftp方式文件下载上传
/// </summary>
public static class FileUpDownload
{
#region 变量属性
/// <summary>
/// Ftp服务器ip
/// </summary>
public static string FtpServerIP = string.Empty;
/// <summary>
/// Ftp 指定用户名
/// </summary>
public static string FtpUserID = string.Empty;
/// <summary>
/// Ftp 指定用户密码
/// </summary>
public static string FtpPassword = string.Empty;

#endregion

#region 从FTP服务器下载文件，指定本地路径和本地文件名
/// <summary>
/// 从FTP服务器下载文件，指定本地路径和本地文件名
/// </summary>
/// <param name="remoteFileName">远程文件名</param>
/// <param name="localFileName">保存本地的文件名（包含路径）</param>
/// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
/// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
/// <returns>是否下载成功</returns>
public static bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, Action<int, int> updateProgress = null)
{
FtpWebRequest reqFTP, ftpsize;
Stream ftpStream = null;
FtpWebResponse response = null;
FileStream outputStream = null;
try
{

outputStream = new FileStream(localFileName, FileMode.Create);
if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)
{
throw new Exception("ftp下载目标服务器地址未设置！");
}
Uri uri = new Uri("ftp://" + FtpServerIP + "/" + remoteFileName);
ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);
ftpsize.UseBinary = true;

reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
reqFTP.UseBinary = true;
reqFTP.KeepAlive = false;
if (ifCredential)//使用用户身份认证
{
ftpsize.Credentials = new NetworkCredential(FtpUserID, FtpPassword);
reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);
}
ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;
FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();
long totalBytes = re.ContentLength;
re.Close();

reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
response = (FtpWebResponse)reqFTP.GetResponse();
ftpStream = response.GetResponseStream();

//更新进度
if (updateProgress != null)
{
updateProgress((int)totalBytes, 0);//更新进度条
}
long totalDownloadedByte = 0;
int bufferSize = 2048;
int readCount;
byte[] buffer = new byte[bufferSize];
readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
totalDownloadedByte = readCount + totalDownloadedByte;
outputStream.Write(buffer, 0, readCount);
//更新进度
if (updateProgress != null)
{
updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条
}
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();
return true;
}
catch (Exception)
{
return false;
throw;
}
finally
{
if (ftpStream != null)
{
ftpStream.Close();
}
if (outputStream != null)
{
outputStream.Close();
}
if (response != null)
{
response.Close();
}
}
}
/// <summary>
/// 从FTP服务器下载文件，指定本地路径和本地文件名（支持断点下载）
/// </summary>
/// <param name="remoteFileName">远程文件名</param>
/// <param name="localFileName">保存本地的文件名（包含路径）</param>
/// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
/// <param name="size">已下载文件流大小</param>
/// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
/// <returns>是否下载成功</returns>
public static bool FtpBrokenDownload(string remoteFileName, string localFileName, bool ifCredential, long size, Action<int, int> updateProgress = null)
{
FtpWebRequest reqFTP, ftpsize;
Stream ftpStream = null;
FtpWebResponse response = null;
FileStream outputStream = null;
try
{

outputStream = new FileStream(localFileName, FileMode.Append);
if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)
{
throw new Exception("ftp下载目标服务器地址未设置！");
}
Uri uri = new Uri("ftp://" + FtpServerIP + "/" + remoteFileName);
ftpsize = (FtpWebRequest)FtpWebRequest.Create(uri);
ftpsize.UseBinary = true;
ftpsize.ContentOffset = size;

reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
reqFTP.UseBinary = true;
reqFTP.KeepAlive = false;
reqFTP.ContentOffset = size;
if (ifCredential)//使用用户身份认证
{
ftpsize.Credentials = new NetworkCredential(FtpUserID, FtpPassword);
reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);
}
ftpsize.Method = WebRequestMethods.Ftp.GetFileSize;
FtpWebResponse re = (FtpWebResponse)ftpsize.GetResponse();
long totalBytes = re.ContentLength;
re.Close();

reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
response = (FtpWebResponse)reqFTP.GetResponse();
ftpStream = response.GetResponseStream();

//更新进度
if (updateProgress != null)
{
updateProgress((int)totalBytes, 0);//更新进度条
}
long totalDownloadedByte = 0;
int bufferSize = 2048;
int readCount;
byte[] buffer = new byte[bufferSize];
readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
totalDownloadedByte = readCount + totalDownloadedByte;
outputStream.Write(buffer, 0, readCount);
//更新进度
if (updateProgress != null)
{
updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条
}
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
ftpStream.Close();
outputStream.Close();
response.Close();
return true;
}
catch (Exception)
{
return false;
throw;
}
finally
{
if (ftpStream != null)
{
ftpStream.Close();
}
if (outputStream != null)
{
outputStream.Close();
}
if (response != null)
{
response.Close();
}
}
}

/// <summary>
/// 从FTP服务器下载文件，指定本地路径和本地文件名
/// </summary>
/// <param name="remoteFileName">远程文件名</param>
/// <param name="localFileName">保存本地的文件名（包含路径）</param>
/// <param name="ifCredential">是否启用身份验证（false：表示允许用户匿名下载）</param>
/// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
/// <param name="brokenOpen">是否断点下载：true 会在localFileName 找是否存在已经下载的文件，并计算文件流大小</param>
/// <returns>是否下载成功</returns>
public static bool FtpDownload(string remoteFileName, string localFileName, bool ifCredential, bool brokenOpen, Action<int, int> updateProgress = null)
{
if (brokenOpen)
{
try
{
long size = 0;
if (File.Exists(localFileName))
{
using (FileStream outputStream = new FileStream(localFileName, FileMode.Open))
{
size = outputStream.Length;
}
}
return FtpBrokenDownload(remoteFileName, localFileName, ifCredential, size, updateProgress);
}
catch
{
throw;
}
}
else
{
return FtpDownload(remoteFileName, localFileName, ifCredential, updateProgress);
}
}
#endregion

#region 上传文件到FTP服务器
/// <summary>
/// 上传文件到FTP服务器
/// </summary>
/// <param name="localFullPath">本地带有完整路径的文件名</param>
/// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
/// <returns>是否下载成功</returns>
public static bool FtpUploadFile(string localFullPathName, Action<int, int> updateProgress = null)
{
FtpWebRequest reqFTP;
Stream stream = null;
FtpWebResponse response = null;
FileStream fs = null;
try
{
FileInfo finfo = new FileInfo(localFullPathName);
if (FtpServerIP == null || FtpServerIP.Trim().Length == 0)
{
throw new Exception("ftp上传目标服务器地址未设置！");
}
Uri uri = new Uri("ftp://" + FtpServerIP + "/" + finfo.Name);
reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);//用户，密码
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;//向服务器发出下载请求命令
reqFTP.ContentLength = finfo.Length;//为request指定上传文件的大小
response = reqFTP.GetResponse() as FtpWebResponse;
reqFTP.ContentLength = finfo.Length;
int buffLength = 1024;
byte[] buff = new byte[buffLength];
int contentLen;
fs = finfo.OpenRead();
stream = reqFTP.GetRequestStream();
contentLen = fs.Read(buff, 0, buffLength);
int allbye = (int)finfo.Length;
//更新进度
if (updateProgress != null)
{
updateProgress((int)allbye, 0);//更新进度条
}
int startbye = 0;
while (contentLen != 0)
{
startbye = contentLen + startbye;
stream.Write(buff, 0, contentLen);
//更新进度
if (updateProgress != null)
{
updateProgress((int)allbye, (int)startbye);//更新进度条
}
contentLen = fs.Read(buff, 0, buffLength);
}
stream.Close();
fs.Close();
response.Close();
return true;

}
catch (Exception)
{
return false;
throw;
}
finally
{
if (fs != null)
{
fs.Close();
}
if (stream != null)
{
stream.Close();
}
if (response != null)
{
response.Close();
}
}
}

/// <summary>
/// 上传文件到FTP服务器(断点续传)
/// </summary>
/// <param name="localFullPath">本地文件全路径名称：C:\Users\JianKunKing\Desktop\IronPython脚本测试工具</param>
/// <param name="remoteFilepath">远程文件所在文件夹路径</param>
/// <param name="updateProgress">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>
/// <returns></returns>
public static bool FtpUploadBroken(string localFullPath, string remoteFilepath, Action<int, int> updateProgress = null)
{
if (remoteFilepath == null)
{
remoteFilepath = "";
}
string newFileName = string.Empty;
bool success = true;
FileInfo fileInf = new FileInfo(localFullPath);
long allbye = (long)fileInf.Length;
if (fileInf.Name.IndexOf("#") == -1)
{
newFileName = RemoveSpaces(fileInf.Name);
}
else
{
newFileName = fileInf.Name.Replace("#", "＃");
newFileName = RemoveSpaces(newFileName);
}
long startfilesize = GetFileSize(newFileName, remoteFilepath);
if (startfilesize >= allbye)
{
return false;
}
long startbye = startfilesize;
//更新进度
if (updateProgress != null)
{
updateProgress((int)allbye, (int)startfilesize);//更新进度条
}

string uri;
if (remoteFilepath.Length == 0)
{
uri = "ftp://" + FtpServerIP + "/" + newFileName;
}
else
{
uri = "ftp://" + FtpServerIP + "/" + remoteFilepath + "/" + newFileName;
}
FtpWebRequest reqFTP;
// 根据uri创建FtpWebRequest对象
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
// 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.AppendFile;
// 指定数据传输类型
reqFTP.UseBinary = true;
// 上传文件时通知服务器文件的大小
reqFTP.ContentLength = fileInf.Length;
int buffLength = 2048;// 缓冲大小设置为2kb
byte[] buff = new byte[buffLength];
// 打开一个文件流 (System.IO.FileStream) 去读上传的文件
FileStream fs = fileInf.OpenRead();
Stream strm = null;
try
{
// 把上传的文件写入流
strm = reqFTP.GetRequestStream();
// 每次读文件流的2kb
fs.Seek(startfilesize, 0);
int 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);
startbye += contentLen;
//更新进度
if (updateProgress != null)
{
updateProgress((int)allbye, (int)startbye);//更新进度条
}
}
// 关闭两个流
strm.Close();
fs.Close();
}
catch
{
success = false;
throw;
}
finally
{
if (fs != null)
{
fs.Close();
}
if (strm != null)
{
strm.Close();
}
}
return success;
}

/// <summary>
/// 去除空格
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
private static string RemoveSpaces(string str)
{
string a = "";
CharEnumerator CEnumerator = str.GetEnumerator();
while (CEnumerator.MoveNext())
{
byte[] array = new byte[1];
array = System.Text.Encoding.ASCII.GetBytes(CEnumerator.Current.ToString());
int asciicode = (short)(array[0]);
if (asciicode != 32)
{
a += CEnumerator.Current.ToString();
}
}
string sdate = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString()
+ System.DateTime.Now.Minute.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString();
return a.Split('.')[a.Split('.').Length - 2] + "." + a.Split('.')[a.Split('.').Length - 1];
}
/// <summary>
/// 获取已上传文件大小
/// </summary>
/// <param name="filename">文件名称</param>
/// <param name="path">服务器文件路径</param>
/// <returns></returns>
public static long GetFileSize(string filename, string remoteFilepath)
{
long filesize = 0;
try
{
FtpWebRequest reqFTP;
FileInfo fi = new FileInfo(filename);
string uri;
if (remoteFilepath.Length == 0)
{
uri = "ftp://" + FtpServerIP + "/" + fi.Name;
}
else
{
uri = "ftp://" + FtpServerIP + "/" + remoteFilepath + "/" + fi.Name;
}
reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
reqFTP.KeepAlive = false;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(FtpUserID, FtpPassword);//用户，密码
reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
filesize = response.ContentLength;
return filesize;
}
catch
{
return 0;
}
}

//public void Connect(String path, string ftpUserID, string ftpPassword)//连接ftp
//{
//    // 根据uri创建FtpWebRequest对象
//    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));
//    // 指定数据传输类型
//    reqFTP.UseBinary = true;
//    // ftp用户名和密码
//    reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
//}

#endregion

}
}

调用实例：
下载（不需要带iis部分的路径）：
FileUpDownload.FtpServerIP = "192.168.1.1";
FileUpDownload.FtpUserID = "ftpTest001";
FileUpDownload.FtpPassword = "aaaaaa";
FileUpDownload.FtpDownload("Beyond Compare（绿色免安装）.zip",
Application.StartupPath + "/downloads/crm2.ra6", false);
之前的上传的文件目录：



上传（不需要带iis部分的路径）：OpenFileDialog op = new OpenFileDialog();
op.InitialDirectory = Application.StartupPath;
op.RestoreDirectory = true;
op.Filter = "压缩文件(*.zip)|*.zip|压缩文件(*.rar)|*.rar|所有文件(*.*)|*.*";
if (op.ShowDialog() == DialogResult.OK)
{
string aa = op.FileName;
FileUpDownload.FtpServerIP = "192.168.1.1";
FileUpDownload.FtpUserID = "ftpTest001";
FileUpDownload.FtpPassword = "aaaaaa";
//全路径
FileUpDownload.FtpUploadFile(aa);
}


 

IIS下搭建FTP服务器：点击打开链接

参考文章：点击打开链接小注： 多线程下载：
将文件分段，分段后，每段启用一个线程来下载（提供一个属性或者入参，来控制启用多少个线程），下载完成后，将文件拼起来（跟断点续传的原理差不多）
具体可以百度搜索：c#  ftp  多线程 下载