FtpHelper implements ftp Server File read/write operations (C #),

FtpHelper implements ftp Server File read/write operations (C #),

I recently created a project and needed to read files on the ftp server. So I referred to some help group methods provided on the Internet and encountered some minor details during use, so I made some changes and shared them.

 

 

Using System; using System. collections. generic; using System. linq; using System. text; using System. net; using System. IO; using System. threading; using System. configuration; namespace FtpSyn {public class FtpHelper {// Basic settings ftp: // 400: ZOina2017@192.168.10.17/400 backup static private string path = @ "ftp: //" + ConfigurationManager. appSettings ["FtpServerIP"]. toString () + "/"; // target path static private strin G ftpip = ConfigurationManager. appSettings ["FtpServerIP"]. toString (); // ftp IP address static private string username = ConfigurationManager. appSettings ["FtpUserName"]. toString (); // ftp Username static private string password = ConfigurationManager. appSettings ["FtpPassWord"]. toString (); // ftp password // obtain the file and folder public static string [] GetFileList (string dir) {string [] downloadFiles; StringBuilder result = new StringBuilder (); FtpWebRequest request; try {request = (FtpWebRequest) FtpWebRequest. create (new Uri (path + dir); request. useBinary = true; request. credentials = new NetworkCredential (username, password); // set the user name and password request. method = WebRequestMethods. ftp. listDirectory; request. useBinary = true; request. usePassive = false; // select active or passive mode. Request. KeepAlive = false; // you must set this attribute. Otherwise, an exception occurs when multiple files are downloaded at a time. WebResponse response = request. GetResponse (); StreamReader reader = new StreamReader (response. GetResponseStream (); string line = reader. ReadLine (); while (line! = Null) {result. append (line); result. append ("\ n"); line = reader. readLine ();} result. remove (result. toString (). lastIndexOf ('\ n'), 1); reader. close (); response. close (); return result. toString (). split ('\ n');} catch (Exception ex) {LogHelper. writeErrorLog ("Get files and folders on ftp:" + ex. message); downloadFiles = null; return downloadFiles ;}} /// <summary> /// obtain the file from the ftp server and convert all the content to string. // </summary>/ // <Param name = "fileName"> </param> /// <param name = "dir"> </param> /// <returns> </returns> public static string GetFileStr (string fileName, string dir) {FtpWebRequest reqFTP; try {reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (path + dir + "/" + fileName); reqFTP. method = WebRequestMethods. ftp. downloadFile; reqFTP. useBinary = true; reqFTP. credentials = new NetworkCredential (username, passw Ord); reqFTP. UsePassive = false; // select active or passive mode. ReqFTP. KeepAlive = false; // you must set this attribute. Otherwise, an exception occurs when multiple files are downloaded at a time. FtpWebResponse response = (FtpWebResponse) reqFTP. getResponse (); Stream ftpStream = response. getResponseStream (); StreamReader reader = new StreamReader (ftpStream); string fileStr = reader. readToEnd (); reader. close (); ftpStream. close (); response. close (); return fileStr;} catch (Exception ex) {LogHelper. writeErrorLog ("failed to get ftp file and read content:" + ex. message); return null ;}/// <summary> /// get the file size /// </ Summary> /// <param name = "file"> relative path of the ip server </param> /// <returns> file size </returns> public static int GetFileSize (string file) {StringBuilder result = new StringBuilder (); FtpWebRequest request; try {request = (FtpWebRequest) FtpWebRequest. create (new Uri (path + file); request. useBinary = true; request. credentials = new NetworkCredential (username, password); // set the user name and password request. method = WebRequestMetho Ds. ftp. getFileSize; int dataLength = (int) request. getResponse (). contentLength; return dataLength;} catch (Exception ex) {Console. writeLine ("An error occurred while obtaining the file size:" + ex. message); return-1 ;}} /// <summary> /// File Upload /// </summary> /// <param name = "filePath"> original path (absolute path) including file name </param> /// <param name = "objPath"> Target Folder: do not enter the root directory as the relative path of the server </param> public static void FileUpLoad (string filePath, string objPath = "") {try {String url = path; if (objPath! = "") Url + = objPath + "/"; try {FtpWebRequest reqFTP = null; // file to be uploaded (full path) try {FileInfo fileInfo = new FileInfo (filePath); using (FileStream fs = fileInfo. openRead () {long length = fs. length; reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (url + fileInfo. name); // set the password reqFTP for connecting to FTP. credentials = new NetworkCredential (username, password); // sets whether to keep the connection reqFTP after the request is complete. keepAlive = false; // specifies the execution Line command reqFTP. method = WebRequestMethods. ftp. uploadFile; // specify the data transmission type reqFTP. useBinary = true; using (Stream stream = reqFTP. getRequestStream () {// set the buffer size int BufferLength = 5120; byte [] B = new byte [BufferLength]; int I; while (I = fs. read (B, 0, BufferLength)> 0) {stream. write (B, 0, I);} Console. writeLine ("File Uploaded successfully") ;}} catch (Exception ex) {Console. writeLine ("failed File Upload error:" + ex. message);} fina Lly {}} catch (Exception ex) {Console. writeLine ("failed File Upload error:" + ex. message);} finally {}} catch (Exception ex) {Console. writeLine ("failed File Upload error:" + ex. message );}} /// <summary> /// delete the file /// </summary> /// <param name = "fileName"> the relative path of the server includes the file name </param> public static void DeleteFileName (string fileName) {try {FileInfo fileInf = new FileInfo (ftpip + "" + fileName); string uri = path + fileName; Ft PWebRequest reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (uri); // specify the data transmission type reqFTP. useBinary = true; // The ftp user name and password reqFTP. credentials = new NetworkCredential (username, password); // The default value is true, and the connection will not be closed. // after a command, reqFTP is executed. keepAlive = false; // specifies the command to execute reqFTP. method = WebRequestMethods. ftp. deleteFile; FtpWebResponse response = (FtpWebResponse) reqFTP. getResponse (); response. close ();} catch (Ex Ception ex) {Console. writeLine ("An error occurred while deleting the file:" + ex. message );}} /// <summary> /// the upper level of the new directory must first exist /// </summary> /// <param name = "dirName"> relative path under the server </ param> public static void MakeDir (string dirName) {try {string uri = path + dirName; FtpWebRequest reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (uri); // specify the data transmission type reqFTP. useBinary = true; // The ftp user name and password reqFTP. credentials = new NetworkCredential (u Sername, password); reqFTP. method = WebRequestMethods. ftp. makeDirectory; FtpWebResponse response = (FtpWebResponse) reqFTP. getResponse (); response. close ();} catch (Exception ex) {Console. writeLine ("Directory creation error:" + ex. message );}} /// <summary> /// the upper-level directory must exist first /// </summary> /// <param name = "dirName"> relative path under the server </ param> public static void DelDir (string dirName) {try {string uri = path + dirName; Ftp WebRequest reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (uri); // ftp user name and password reqFTP. credentials = new NetworkCredential (username, password); reqFTP. method = WebRequestMethods. ftp. removeDirectory; FtpWebResponse response = (FtpWebResponse) reqFTP. getResponse (); response. close ();} catch (Exception ex) {Console. writeLine ("failed to delete Directory:" + ex. message) ;}/// <summary> /// obtain the folder list from the ftp server /// </sum Mary> /// <param name = "RequedstPath"> relative path under the server </param> /// <returns> </returns> public static List <string> GetDirctory (string RequedstPath) {List <string> strs = new List <string> (); try {string uri = path + RequedstPath; // The target path is the server address FtpWebRequest reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (uri); // ftp user name and password reqFTP. credentials = new NetworkCredential (username, password); reqFTP. met Hod = WebRequestMethods. ftp. listDirectoryDetails; WebResponse response = reqFTP. getResponse (); StreamReader reader = new StreamReader (response. getResponseStream (); // Chinese file name string line = reader. readLine (); while (line! = Null) {if (line. contains ("<DIR>") {string msg = line. substring (line. lastIndexOf ("<DIR>") + 5 ). trim (); strs. add (msg);} line = reader. readLine ();} reader. close (); response. close (); return strs;} catch (Exception ex) {Console. writeLine ("failed to get directory:" + ex. message);} return strs ;} /// <summary> /// obtain the file list from the ftp server /// </summary> /// <param name = "RequedstPath"> relative path under the server </param> // <returns> </returns> Public static List <string> GetFile (string RequedstPath) {List <string> strs = new List <string> (); try {string uri = path + RequedstPath; // The target path is the server address FtpWebRequest reqFTP = (FtpWebRequest) FtpWebRequest. create (new Uri (uri); // ftp user name and password reqFTP. credentials = new NetworkCredential (username, password); reqFTP. method = WebRequestMethods. ftp. listDirectoryDetails; WebResponse response = reqFTP. G EtResponse (); StreamReader reader = new StreamReader (response. GetResponseStream (); // Chinese file name string line = reader. ReadLine (); while (line! = Null) {if (! Line. contains ("<DIR>") {string msg = line. substring (39 ). trim (); strs. add (msg);} line = reader. readLine ();} reader. close (); response. close (); return strs;} catch (Exception ex) {Console. writeLine ("File Retrieval error:" + ex. message) ;}return strs ;}}}