C#实现FTP文件的上传、下载功能、新建目录以及文件的删除

　　本来这篇博文应该在上周就完成的，可无奈，最近工作比较忙，没有时间写，所以推迟到了今天。可悲的是，今天也没有太多的时间，所以决定给大家贴出源码，不做详细的分析说明，如果有不懂的，可以给我留言，我们共同讨论。

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using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Security.Cryptography; using System.Text; using System.Windows.Forms;   namespace UpLoad {     class UpLoadFiles     {         private static string FTPCONSTR = "";//FTP的服务器地址，格式为ftp://192.168.1.234:8021/。ip地址和端口换成自己的，这些建议写在配置文件中，方便修改         private static string FTPUSERNAME = "";//FTP服务器的用户名         private static string FTPPASSWORD = "";//FTP服务器的密码           #region 本地文件上传到FTP服务器         /// <summary>         /// 上传文件到远程ftp         /// </summary>         /// <param name="path">本地的文件目录</param>         /// <param name="name">文件名称</param>         /// <returns></returns>         public static bool UploadFile(string path, string name)         {             string erroinfo = "";             FileInfo f = new FileInfo(path);             path = path.Replace("\\", "/");             path = FTPCONSTR + "/data/uploadFile/photo/" + name;//这个路径是我要传到ftp目录下的这个目录下             FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));             reqFtp.UseBinary = true;             reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);             reqFtp.KeepAlive = false;             reqFtp.Method = WebRequestMethods.Ftp.UploadFile;             reqFtp.ContentLength = f.Length;             int buffLength = 2048;             byte[] buff = new byte[buffLength];             int contentLen;             FileStream fs = f.OpenRead();             try             {                 Stream strm = reqFtp.GetRequestStream();                 contentLen = fs.Read(buff, 0, buffLength);                 while (contentLen != 0)                 {                     strm.Write(buff, 0, contentLen);                     contentLen = fs.Read(buff, 0, buffLength);                 }                 strm.Close();                 fs.Close();                 erroinfo = "完成";                 return true;             }             catch (Exception ex)             {                 erroinfo = string.Format("因{0},无法完成上传", ex.Message);                 return false;             }         }           /// <summary>         /// 上传文件到远程ftp         /// </summary>         /// <param name="ftpPath">ftp上的文件路径</param>         /// <param name="path">本地的文件目录</param>         /// <param name="id">文件名</param>         /// <returns></returns>         public static bool UploadFile(string ftpPath, string path, string id)         {             string erroinfo = "";             FileInfo f = new FileInfo(path);             path = path.Replace("\\", "/");             bool b = MakeDir(ftpPath);             if (b == false)             {                 return false;             }             path = FTPCONSTR + ftpPath + id;             FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));             reqFtp.UseBinary = true;             reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);             reqFtp.KeepAlive = false;             reqFtp.Method = WebRequestMethods.Ftp.UploadFile;             reqFtp.ContentLength = f.Length;             int buffLength = 2048;             byte[] buff = new byte[buffLength];             int contentLen;             FileStream fs = f.OpenRead();             try             {                 Stream strm = reqFtp.GetRequestStream();                 contentLen = fs.Read(buff, 0, buffLength);                 while (contentLen != 0)                 {                     strm.Write(buff, 0, contentLen);                     contentLen = fs.Read(buff, 0, buffLength);                 }                 strm.Close();                 fs.Close();                 erroinfo = "完成";                 return true;             }             catch (Exception ex)             {                 erroinfo = string.Format("因{0},无法完成上传", ex.Message);                 return false;             }         }         /// <summary>         /// 上传         /// </summary>         /// <param name="path">本地的文件目录</param>         /// <param name="name">文件名称</param>         /// <param name="pb">进度条</param>         /// <returns></returns>         public static bool UploadFile(string path, string name, ProgressBar pb)         {             string erroinfo = "";             float percent = 0;             FileInfo f = new FileInfo(path);             path = path.Replace("\\", "/");             path = FTPCONSTR + "/data/uploadFile/photo/" + name;             FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));             reqFtp.UseBinary = true;             reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);             reqFtp.KeepAlive = false;             reqFtp.Method = WebRequestMethods.Ftp.UploadFile;             reqFtp.ContentLength = f.Length;             int buffLength = 2048;             byte[] buff = new byte[buffLength];             int contentLen;             FileStream fs = f.OpenRead();             int allbye = (int)f.Length;             if (pb != null)             {                 pb.Maximum = (int)allbye;               }             int startbye = 0;             try             {                 Stream strm = reqFtp.GetRequestStream();                 contentLen = fs.Read(buff, 0, buffLength);                 while (contentLen != 0)                 {                     strm.Write(buff, 0, contentLen);                     startbye = contentLen + startbye;                     if (pb != null)                     {                         pb.Value = (int)startbye;                     }                     contentLen = fs.Read(buff, 0, buffLength);                     percent = (float)startbye / (float)allbye * 100;                 }                 strm.Close();                 fs.Close();                 erroinfo = "完成";                 return true;             }             catch (Exception ex)             {                 erroinfo = string.Format("因{0},无法完成上传", ex.Message);                 return false;             }         }         /// <summary>         /// 文件上传到ftp         /// </summary>         /// <param name="ftpPath">ftp的文件路径</param>         /// <param name="path">本地的文件目录</param>         /// <param name="name">文件名称</param>         /// <param name="pb">进度条</param>         /// <returns></returns>         public static bool UploadFile(string ftpPath, string path, string name, ProgressBar pb)         {             //path = "ftp://" + UserUtil.serverip + path;             string erroinfo = "";             float percent = 0;             FileInfo f = new FileInfo(path);             path = path.Replace("\\", "/");             bool b = MakeDir(ftpPath);             if (b == false)             {                 return false;             }             path = FTPCONSTR + ftpPath + name;             FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));             reqFtp.UseBinary = true;             reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);             reqFtp.KeepAlive = false;             reqFtp.Method = WebRequestMethods.Ftp.UploadFile;             reqFtp.ContentLength = f.Length;             int buffLength = 2048;             byte[] buff = new byte[buffLength];             int contentLen;             FileStream fs = f.OpenRead();             int allbye = (int)f.Length;             //if (pb != null)             //{             //    pb.Maximum = (int)allbye;               //}             int startbye = 0;             try             {                 Stream strm = reqFtp.GetRequestStream();                 contentLen = fs.Read(buff, 0, buffLength);                 while (contentLen != 0)                 {                     strm.Write(buff, 0, contentLen);                     startbye = contentLen + startbye;                     percent = (float)startbye / (float)allbye * 100;                     if (percent <= 100)                     {                         int i = (int)percent;                         if (pb != null)                         {                             pb.BeginInvoke(new updateui(upui), new object[] { allbye, i, pb });                         }                     }                       contentLen = fs.Read(buff, 0, buffLength);                       //  Console.WriteLine(percent);                 }                 strm.Close();                 fs.Close();                 erroinfo = "完成";                 return true;             }             catch (Exception ex)             {                 erroinfo = string.Format("因{0},无法完成上传", ex.Message);                 return false;             }         }         private delegate void updateui(long rowCount, int i, ProgressBar PB);         public static void upui(long rowCount, int i, ProgressBar PB)         {             try             {                 PB.Value = i;             }             catch { }         }         ////上面的代码实现了从ftp服务器下载文件的功能         public static Stream Download(string ftpfilepath)         {             Stream ftpStream = null;             FtpWebResponse response = null;             try             {                 ftpfilepath = ftpfilepath.Replace("\\", "/");                 string url = FTPCONSTR + ftpfilepath;                 FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);                 response = (FtpWebResponse)reqFtp.GetResponse();                 ftpStream = response.GetResponseStream();             }             catch (Exception ee)             {                 if (response != null)                 {                     response.Close();                 }                 MessageBox.Show("文件读取出错，请确认FTP服务器服务开启并存在该文件");             }             return ftpStream;         }         #endregion           #region 从ftp服务器下载文件           /// <summary>         /// 从ftp服务器下载文件的功能         /// </summary>         /// <param name="ftpfilepath">ftp下载的地址</param>         /// <param name="filePath">存放到本地的路径</param>         /// <param name="fileName">保存的文件名称</param>         /// <returns></returns>         public static bool Download(string ftpfilepath, string filePath, string fileName)         {             try             {                 filePath = filePath.Replace("我的电脑\\", "");                 String onlyFileName = Path.GetFileName(fileName);                 string newFileName = filePath + onlyFileName;                 if (File.Exists(newFileName))                 {                     //errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);                                        File.Delete(newFileName);                     //return false;                 }                 ftpfilepath = ftpfilepath.Replace("\\", "/");                 string url = FTPCONSTR + ftpfilepath;                 FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, 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);                 while (readCount > 0)                 {                     outputStream.Write(buffer, 0, readCount);                     readCount = ftpStream.Read(buffer, 0, bufferSize);                 }                 ftpStream.Close();                 outputStream.Close();                 response.Close();                 return true;             }             catch (Exception ex)             {                 //errorinfo = string.Format("因{0},无法下载", ex.Message);                 return false;             }         }         //         /// <summary>         /// 从ftp服务器下载文件的功能----带进度条         /// </summary>         /// <param name="ftpfilepath">ftp下载的地址</param>         /// <param name="filePath">保存本地的地址</param>         /// <param name="fileName">保存的名字</param>         /// <param name="pb">进度条引用</param>         /// <returns></returns>         public static bool Download(string ftpfilepath, string filePath, string fileName, ProgressBar pb)         {             FtpWebRequest reqFtp = null;             FtpWebResponse response = null;             Stream ftpStream = null;             FileStream outputStream = null;             try             {                 filePath = filePath.Replace("我的电脑\\", "");                 String onlyFileName = Path.GetFileName(fileName);                 string newFileName = filePath + onlyFileName;                 if (File.Exists(newFileName))                 {                     try                     {                         File.Delete(newFileName);                     }                     catch { }                   }                 ftpfilepath = ftpfilepath.Replace("\\", "/");                 string url = FTPCONSTR + ftpfilepath;                 reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);                 response = (FtpWebResponse)reqFtp.GetResponse();                 ftpStream = response.GetResponseStream();                 long cl = GetFileSize(url);                 int bufferSize = 2048;                 int readCount;                 byte[] buffer = new byte[bufferSize];                 readCount = ftpStream.Read(buffer, 0, bufferSize);                 outputStream = new FileStream(newFileName, FileMode.Create);                   float percent = 0;                 while (readCount > 0)                 {                     outputStream.Write(buffer, 0, readCount);                     readCount = ftpStream.Read(buffer, 0, bufferSize);                     percent = (float)outputStream.Length / (float)cl * 100;                     if (percent <= 100)                     {                         if (pb != null)                         {                             pb.Invoke(new updateui(upui), new object[] { cl, (int)percent, pb });                         }                     }                     // pb.Invoke(new updateui(upui), new object[] { cl, outputStream.Length, pb });                   }                   //MessageBoxEx.Show("Download0");                 return true;             }             catch (Exception ex)             {                 //errorinfo = string.Format("因{0},无法下载", ex.Message);                 //MessageBoxEx.Show("Download00");                 return false;             }             finally             {                 //MessageBoxEx.Show("Download2");                 if (reqFtp != null)                 {                     reqFtp.Abort();                 }                 if (response != null)                 {                     response.Close();                 }                 if (ftpStream != null)                 {                     ftpStream.Close();                 }                 if (outputStream != null)                 {                     outputStream.Close();                 }             }         }         #endregion           #region 获得文件的大小         /// <summary>         /// 获得文件大小         /// </summary>         /// <param name="url">FTP文件的完全路径</param>         /// <returns></returns>         public static long GetFileSize(string url)         {               long fileSize = 0;             try             {                 FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);                 reqFtp.Method = WebRequestMethods.Ftp.GetFileSize;                 FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();                 fileSize = response.ContentLength;                   response.Close();             }             catch (Exception ex)             {                 MessageBox.Show(ex.Message);             }             return fileSize;         }         #endregion           #region 在ftp服务器上创建文件目录           /// <summary>         ///在ftp服务器上创建文件目录         /// </summary>         /// <param name="dirName">文件目录</param>         /// <returns></returns>         public static bool MakeDir(string dirName)         {             try             {                 bool b = RemoteFtpDirExists(dirName);                 if (b)                 {                     return true;                 }                 string url = FTPCONSTR + dirName;                 FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 // reqFtp.KeepAlive = false;                 reqFtp.Method = WebRequestMethods.Ftp.MakeDirectory;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);                 FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();                 response.Close();                 return true;             }             catch (Exception ex)             {                 //errorinfo = string.Format("因{0},无法下载", ex.Message);                 return false;             }           }         /// <summary>         /// 判断ftp上的文件目录是否存在         /// </summary>         /// <param name="path"></param>         /// <returns></returns>         public static bool RemoteFtpDirExists(string path)         {               path = FTPCONSTR + path;             FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));             reqFtp.UseBinary = true;             reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);             reqFtp.Method = WebRequestMethods.Ftp.ListDirectory;             FtpWebResponse resFtp = null;             try             {                 resFtp = (FtpWebResponse)reqFtp.GetResponse();                 FtpStatusCode code = resFtp.StatusCode;//OpeningData                 resFtp.Close();                 return true;             }             catch             {                 if (resFtp != null)                 {                     resFtp.Close();                 }                 return false;             }         }         #endregion           #region 从ftp服务器删除文件的功能         /// <summary>         /// 从ftp服务器删除文件的功能         /// </summary>         /// <param name="fileName"></param>         /// <returns></returns>         public static bool DeleteFile(string fileName)         {             try             {                 string url = FTPCONSTR + fileName;                 FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));                 reqFtp.UseBinary = true;                 reqFtp.KeepAlive = false;                 reqFtp.Method = WebRequestMethods.Ftp.DeleteFile;                 reqFtp.Credentials = new NetworkCredential(FTPUSERNAME, FTPPASSWORD);                 FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();                 response.Close();                 return true;             }             catch (Exception ex)             {                 //errorinfo = string.Format("因{0},无法下载", ex.Message);                 return false;             }         }         #endregion     } }

 　　这是从FTP文件上传、下载、新建目录以及删除文件的一个类，应该有用的到的地放。关于ftp的配置，如果大家有疑问的话可以去网上查查，如果后期我有时间的话我也会写一写。