Asp.net MVC 从ftp服务器读取文件保存到网站本地

1 FTP连接辅助类

/// <summary>/// FTP操作单元/// </summary>public class TFTPOperationUnit{/// <summary>/// ftp地址/// </summary>private string FFTPUrl;/// <summary>/// ftp用户名/// </summary>string FFTPUserName;/// <summary>/// ftp用户密码/// </summary>string FFTPPwd;private NetworkCredential fNetworkCredential;/// <summary>/// FTP登录信息（账号，密码）/// </summary>public NetworkCredential FNetworkCredential{get{if (fNetworkCredential == null){fNetworkCredential = new NetworkCredential(FFTPUserName, FFTPPwd);}return fNetworkCredential;}}/// <summary>/// 初始化FTP/// </summary>/// <param name="aUrl">地址</param>/// <param name="aUserName">用户名</param>/// <param name="aPwd">密码</param>public TFTPOperationUnit(string aUrl = "", string aUserName = "", string aPwd = ""){FFTPUrl = aUrl;FFTPUserName = aUserName;FFTPPwd = aPwd;}/// <summary>/// ftp服务器上获得文件列表/// </summary>/// <param name="aFolderName">文件夹名称</param>/// <returns></returns>public string[] GetFolderPathFiles(string aFolderName){//ftp服务器指定文件夹路径string bFTPFolderPath = FFTPUrl + aFolderName;//文件夹下文件列表string[] bFolderPathFiles = new string[] { };StringBuilder bReadStr = new StringBuilder();FtpWebRequest bRequestFtp = null;WebResponse bResponseFtp = null;StreamReader bReadStem = null;try{//创建请求bRequestFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(bFTPFolderPath));bRequestFtp.Credentials = FNetworkCredential;bRequestFtp.UseBinary = true;bRequestFtp.Method = WebRequestMethods.Ftp.ListDirectory;//获取响应bResponseFtp = bRequestFtp.GetResponse();bReadStem = new StreamReader(bResponseFtp.GetResponseStream(), System.Text.Encoding.Default);//中文文件名string bReadStrLine = bReadStem.ReadLine();while (bReadStrLine != null){bReadStr.Append(bReadStrLine);bReadStr.Append("\n");bReadStrLine = bReadStem.ReadLine();}bReadStrLine = null;if (bReadStr.ToString().Trim() != ""){bReadStr.Remove(bReadStr.ToString().LastIndexOf('\n'), 1);bFolderPathFiles = bReadStr.ToString().Split('\n');}return bFolderPathFiles;}catch (Exception e){return bFolderPathFiles;}finally{bReadStem?.Close();bReadStem = null;bResponseFtp?.Close();bResponseFtp = null;bRequestFtp?.Abort();bRequestFtp = null;bFTPFolderPath = null;}}/// <summary>/// ftp上传文件/// </summary>/// <param name="aLocalDirPath">本地文件夹路径</param>/// <param name="aFolderName">ftp文件夹名称</param>/// <param name="aFileName">文件名称</param>/// <param name="aExtension">文件后缀</param>/// <returns></returns>public int DoFTPUpLoadFiles(string aLocalDirPath, string aFolderName, string aFileName, string aExtension){int bResult = -1;int bWaitTime = 0;string bLocalDirPath = aLocalDirPath + "\\" + aFileName + aExtension;//上传文件是否存在while (!File.Exists(bLocalDirPath) && bWaitTime < 100){Thread.Sleep(100);bWaitTime++;}if (!File.Exists(bLocalDirPath)){bResult = -1;}else{bResult = DoFtpUploadFile(bLocalDirPath, aFolderName, aFileName + aExtension);}return bResult;}/// <summary>/// 上传文件/// </summary>/// <param name="aLocalDirPath">上传文件所在路径</param>/// <param name="aFolderName">FTP文件夹名称</param>/// <param name="aFileName">FTP文件名称(含后缀)</param>/// <returns></returns>private int DoFtpUploadFile(string aLocalDirPath, string aFolderName, string aFileName){int bResult = -1;//检查ftp是否存在文件夹，没有则创建bResult = DoFtpMakeDir(aFolderName);if (bResult != 0){return bResult;}string bFTPFileFullPath = FFTPUrl + aFolderName + "/" + aFileName;FileInfo bFileInfo = null;FileStream bFileStem = null;//ftp文件所在路径Uri bUri = new Uri(bFTPFileFullPath);FtpWebRequest bFTPRequest = null;try{bFileInfo = new FileInfo(aLocalDirPath);bFileStem = bFileInfo.OpenRead();long length = bFileStem.Length;bFTPRequest = (FtpWebRequest)WebRequest.Create(bUri);bFTPRequest.Credentials = FNetworkCredential;bFTPRequest.Method = WebRequestMethods.Ftp.UploadFile;bFTPRequest.ContentLength = length;bFTPRequest.Timeout = 5 * 1000;Stream bStem = bFTPRequest.GetRequestStream();int BufferLength = 2048; //2K     byte[] bBytes = new byte[BufferLength];int i;while ((i = bFileStem.Read(bBytes, 0, BufferLength)) > 0){bStem.Write(bBytes, 0, i);}bStem.Close();bStem.Dispose();bStem = null;bBytes = null;bResult = 0;return bResult;}catch (Exception e){bResult = -1;return bResult;}finally{bFileStem?.Dispose();bFileStem = null;bFileInfo = null;bUri = null;bFileStem?.Close();bFileStem = null;bFTPRequest?.Abort();bFTPRequest = null;bFTPFileFullPath = null;}}/// <summary>/// 从ftp下载文件/// </summary>/// <param name="aFileName">文件路径</param>/// <returns></returns>public Stream DoDTPDownloadFile(string aFileName){Stream bStem = null;FtpWebResponse bFTPResponse = null;FtpWebRequest bFTPRequest = null;try{aFileName = aFileName.Replace("\\", "/");string aUrl = FFTPUrl + aFileName;bFTPRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(aUrl));bFTPRequest.UseBinary = true;bFTPRequest.Credentials = FNetworkCredential;bFTPResponse = (FtpWebResponse)bFTPRequest.GetResponse();bStem = bFTPResponse.GetResponseStream();return bStem;}catch (Exception e){bStem = null;return bStem;}finally{//不能进行释放，否则 bStem会释放。}}/// <summary>/// 在ftp创建文件夹/// </summary>/// <param name="aFolderPath">文件夹路径</param>int DoFtpMakeDir(string aFolderPath){int bResult = -1;string bFolderPath = FFTPUrl + aFolderPath;FtpWebRequest bFTPRequest = null;FtpWebResponse bFTPResponse = null;try{bFTPRequest = (FtpWebRequest)FtpWebRequest.Create(bFolderPath);bFTPRequest.Credentials = FNetworkCredential;bFTPRequest.Method = WebRequestMethods.Ftp.MakeDirectory;bFTPRequest.UseBinary = true;bFTPRequest.Proxy = null;bFTPResponse = (FtpWebResponse)bFTPRequest.GetResponse();bFTPResponse.Close();bFTPResponse = null;bResult = 0;return bResult;}catch (Exception e){//文件已存在if (e.Message.Contains("(550) 文件不可用")){bResult = 0;}else{bResult = -1;}return bResult;}finally{bFTPResponse?.Close();bFTPResponse = null;bFTPRequest?.Abort();bFTPRequest = null;}}/// <summary>/// 在ftp删除文件夹/// </summary>/// <param name="aFolderPath">文件夹路径</param>public bool DoFtpDeleteDir(string aFolderPath){FtpWebRequest bFTPRequest = null;FtpWebResponse bFTPResponse = null;try{if (string.IsNullOrWhiteSpace(aFolderPath)) return true;bFTPRequest = (FtpWebRequest)FtpWebRequest.Create(aFolderPath);bFTPRequest.Credentials = FNetworkCredential;bFTPRequest.KeepAlive = false;bFTPRequest.ContentLength = 1000;bFTPRequest.Timeout = 5 * 1000;bFTPRequest.Method = WebRequestMethods.Ftp.DeleteFile;bFTPResponse = (FtpWebResponse)bFTPRequest.GetResponse();return true;}catch (Exception e){return false;}finally{bFTPResponse?.Close();bFTPResponse = null;bFTPRequest?.Abort();bFTPRequest = null;}}}

2 WebApi接口实现

/// <summary>/// 返回ftp上文件的base64字符串/// </summary>/// <param name="PdfName"></param>/// <returns></returns>[HttpGet]public IHttpActionResult GetFTPPdfBaseStr(string PdfName) {try{TFTPOperationUnit bFTPOperationUnit = new TFTPOperationUnit("ftp://192.168.1.106:21/", "ftp", "123456");string base64Str = default(string);int bufferSize = 2048;byte[] buffer = new byte[bufferSize];using (System.IO.Stream fileStream = bFTPOperationUnit.DoDTPDownloadFile(PdfName)){int readCount;   //读取到的数据流的长度readCount =fileStream.Read(buffer, 0, bufferSize);byte[] bTmp = new byte[0];//循环加载数据，因为数据流太长，长度获取异常while (readCount > 0){bTmp = bTmp.Concat(buffer).ToArray();readCount = fileStream.Read(buffer, 0, bufferSize);}base64Str = Convert.ToBase64String(bTmp);}return Json(new { Code = 0, Msg = "查询成功", Data = base64Str });}catch (Exception e){return Json(new { Code = -1, Msg = "查询失败：" + e.Message });}}

3 MVC后台保存pdf文件

/// <summary>/// Base64字符串转文件并保存/// </summary>/// <param name="base64String">base64字符串</param>/// <param name="fileName">保存的文件名</param>/// <returns>是否转换并保存成功</returns>[HttpPost]public string Base64StringToFile(string base64String, string folder, string pdfName){try{string bPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "\\PDFfiles";string bFileName = pdfName + ".pdf";string fileFullPath = bPath + "\\" + folder; //文件保存路径if (!Directory.Exists(fileFullPath)){Directory.CreateDirectory(fileFullPath);}//判断是否已经存在此文件，若存在则删除if (System.IO.File.Exists(fileFullPath + "\\" + bFileName)){System.IO.File.Delete(fileFullPath + "\\" + bFileName);//return folder + "\\" + fileName;}//string strbase64 = base64String.Trim().Substring(base64String.IndexOf(",") + 1); //将‘，’以前的多余字符串删除string strbase64 = base64String;int bufferSize = 2048;MemoryStream stream = new MemoryStream(Convert.FromBase64String(strbase64));FileStream fs = new FileStream(fileFullPath + "\\" + bFileName, FileMode.OpenOrCreate, FileAccess.Write);byte[] bData = Convert.FromBase64String(strbase64);  //stream.ToArray();//fs.Write(b, 0, b.Length);//fs.Close();int readCount = stream.Read(bData, 0, bufferSize);while (readCount > 0){fs.Write(bData, 0, readCount);readCount = stream.Read(bData, 0, bufferSize);}fs.Close();fs = null;return folder + "\\" + bFileName;}catch (Exception e){return "";}}private static string logPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "\\PDFfiles";/// <summary>/// Base64字符串转文件并保存/// </summary>/// <param name="base64String">base64字符串</param>/// <param name="fileName">保存的文件名</param>/// <returns>是否转换并保存成功</returns>[HttpPost]public string Base64StringToFile(string base64String,string folder,string pdfName){try{string fileName = pdfName+".jpg";string fileFullPath = logPath+"\\"+folder; //文件保存路径if (!Directory.Exists(fileFullPath)){Directory.CreateDirectory(fileFullPath);}//判断是否已经存在此文件，若存在则删除if (System.IO.File.Exists(fileFullPath + "\\" + fileName)){System.IO.File.Delete(fileFullPath + "\\" + fileName);//return folder + "\\" + fileName;}//string strbase64 = base64String.Trim().Substring(base64String.IndexOf(",") + 1); //将‘，’以前的多余字符串删除string strbase64 = base64String;MemoryStream stream = new MemoryStream(Convert.FromBase64String(strbase64));FileStream fs = new FileStream(fileFullPath + "\\" + fileName, FileMode.OpenOrCreate, FileAccess.Write);byte[] b = stream.ToArray();fs.Write(b, 0, b.Length);fs.Close();return folder + "\\" + fileName;}catch (Exception e){return "";}}

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