C#实现FTP文件的上传、下载功能、新建目录以及文件的删除

转载至：https://www.cnblogs.com/zhenzaizai/p/7434669.html


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

         ///

        /// 上传文件到远程ftp
        ///
        /// 本地的文件目录
        /// 文件名称
        ///
        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 ;
            }
        }

         ///

        /// 上传文件到远程ftp
        ///
        /// ftp上的文件路径
        /// 本地的文件目录
        /// 文件名
        ///
        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 ;
            }
        }

         ///

        /// 上传
        ///
        /// 本地的文件目录
        /// 文件名称
        /// 进度条
        ///
        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 ;
            }
        }

         ///

        /// 文件上传到ftp
        ///
        /// ftp的文件路径
        /// 本地的文件目录
        /// 文件名称
        /// 进度条
        ///
        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

         ///

        /// 从ftp服务器下载文件的功能
        ///
        /// ftp下载的地址
        /// 存放到本地的路径
        /// 保存的文件名称
        ///
        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 ;
            }
        }
        //

         ///

        /// 从ftp服务器下载文件的功能----带进度条
        ///
        /// ftp下载的地址
        /// 保存本地的地址
        /// 保存的名字
        /// 进度条引用
        ///
        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

         ///

        /// 获得文件大小
        ///
        /// FTP文件的完全路径
        ///
        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

         ///

        ///在ftp服务器上创建文件目录
        ///
        /// 文件目录
        ///
        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 ;
            }

        }

         ///

        /// 判断ftp上的文件目录是否存在
        ///
        ///
        ///
        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

         ///

        /// 从ftp服务器删除文件的功能
        ///
        ///
        ///
        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
    }
}