C# FTP上传下载（支持断点续传）

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jiankunking 2022-07-25 22:14:26 博主文章分类：C# ©著作权

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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：

C# FTP上传下载（支持断点续传）_FTP

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);              
            }