C#中FTP上传下载

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Windows.Forms;
//using ESRI.ArcGIS.esriSystem;
using System.Text.RegularExpressions;
using DigitalMine.ImageManagement;

namespace Subsidence_Forecast_System.ImageManagement
{
   public  class ftp
    {
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        /// <param name="targetDir">目标路径</param>
        /// <param name="hostname">ftp地址</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
       public void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
       {
           //1. check target
           string target;
           if (targetDir.Trim() == "")
           {
               return;
           }
           target = Guid.NewGuid().ToString();  //使用临时文件名


           string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
           ///WebClient webcl = new WebClient();
           System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

           //设置FTP命令 设置所要执行的FTP命令，
           //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
           ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
           //指定文件传输的数据类型
           ftp.UseBinary = true;
           ftp.UsePassive = true;

           //告诉ftp文件大小
           ftp.ContentLength = fileinfo.Length;
           //缓冲大小设置为2KB
           const int BufferSize = 2048;
           byte[] content = new byte[BufferSize - 1 + 1];
           int dataRead;

           //打开一个文件流 (System.IO.FileStream) 去读上传的文件
           using (FileStream fs = fileinfo.OpenRead())
           {
               //try
               //{
               //把上传的文件写入流
               using (Stream rs = ftp.GetRequestStream())
               {
                   do
                   {
                       //每次读文件流的2KB
                       dataRead = fs.Read(content, 0, BufferSize);
                       rs.Write(content, 0, dataRead);
                   } while (!(dataRead < BufferSize));
                   rs.Close();
               }

               //}
               //catch (Exception ex) { }
               //finally
               //{
               //    fs.Close();
               //}
               fs.Close();
           }

           ftp = null;
           //设置FTP命令
           ftp = GetRequest(URI, username, password);
           ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
           ftp.RenameTo = fileinfo.Name;
           try
           {
               ftp.GetResponse();
           }
           catch (Exception ex)
           {
               ftp = GetRequest(URI, username, password);
               ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
               ftp.GetResponse();
               throw ex;
           }
           finally
           {
               //fileinfo.Delete();
           }

           // 可以记录一个日志  "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
           ftp = null;

           #region
           /*****
             *FtpWebResponse
             * ****/
           //FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
           #endregion
       }
       //public void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
       //{
       //    FTPClient ftpC = new FTPClient();
       //    ftpC.RemoteHost = hostname;
       //    ftpC.RemotePass = password;

       //    ftpC.RemotePort = 21;
       //    ftpC.RemoteUser = username;
       //    ftpC.Connect();
       //    ftpC.Put(fileinfo.FullName);

       //}
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="localDir">下载至本地路径</param>
        /// <param name="FtpDir">ftp目标文件路径</param>
        /// <param name="FtpFile">从ftp要下载的文件名</param>
        /// <param name="hostname">ftp地址即IP</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void DownloadFile(string localDir, string FtpDir, string FtpFile, string hostname, string username, string password)
        {
            string URI = "FTP://" + hostname + "/" + FtpDir + "/" + FtpFile;
            string tmpname = Guid.NewGuid().ToString();
            string localfile = localDir + @"\" + tmpname;

            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
            ftp.UseBinary = true;
            ftp.UsePassive = false;

            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    //loop to read & write to file
                    using (FileStream fs = new FileStream(localfile, FileMode.CreateNew))
                    {
                        try
                        {
                            byte[] buffer = new byte[2048];
                            int read = 0;
                            do
                            {
                                read = responseStream.Read(buffer, 0, buffer.Length);
                                fs.Write(buffer, 0, read);
                            } while (!(read == 0));
                            responseStream.Close();
                            fs.Flush();
                            fs.Close();
                        }
                        catch (Exception)
                        {
                            //catch error and delete file only partially downloaded
                            fs.Close();
                            //delete target file as it's incomplete
                            File.Delete(localfile);
                            throw;
                        }
                    }

                    responseStream.Close();
                }

                response.Close();
            }



            try
            {
                File.Delete(localDir + @"\" + FtpFile);
                File.Move(localfile, localDir + @"\" + FtpFile);


                ftp = null;
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;
                ftp.GetResponse();

            }
            catch (Exception ex)
            {
                File.Delete(localfile);
                throw ex;
            }

            // 记录日志 "从" + URI.ToString() + "下载到" + localDir + @"\" + FtpFile + "成功." );
            ftp = null;
        }

        /// <summary>
        /// 搜索远程文件
        /// </summary>
        /// <param name="targetDir"></param>
        /// <param name="hostname"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <param name="SearchPattern"></param>
        /// <returns></returns>
        public static List<string> ListDirectory(string targetDir, string hostname, string username, string password, string SearchPattern)
        {
            List<string> result = new List<string>();
            try
            {
                string URI = "FTP://" + hostname + "/" + targetDir + "/" + SearchPattern;

                System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;
                ftp.UsePassive = true;
                ftp.UseBinary = true;


                string str = GetStringResponse(ftp);
                str = str.Replace("\r\n", "\r").TrimEnd('\r');
                str = str.Replace("\n", "\r");
                if (str != string.Empty)
                    result.AddRange(str.Split('\r'));

                return result;
            }
            catch { }
            return null;
        }

        private static string GetStringResponse(FtpWebRequest ftp)
        {
            //Get the result, streaming to a string
            string result = "";
            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                long size = response.ContentLength;
                using (Stream datastream = response.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.Default))
                    {
                        result = sr.ReadToEnd();
                        sr.Close();
                    }

                    datastream.Close();
                }

                response.Close();
            }

            return result;
        }

        /// 在ftp服务器上创建目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void MakeDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.MakeDirectory;

                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void delDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 文件重命名
        /// </summary>
        /// <param name="currentFilename">当前目录名称</param>
        /// <param name="newFilename">重命名目录名称</param>
        /// <param name="ftpServerIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void Rename(string currentFilename, string newFilename, string ftpServerIP, string username, string password)
        {
            try
            {

                FileInfo fileInf = new FileInfo(currentFilename);
                string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.Rename;

                ftp.RenameTo = newFilename;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();

                response.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            //根据服务器信息FtpWebRequest创建类的对象
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            //提供身份验证信息
            result.Credentials = new System.Net.NetworkCredential(username, password);
            //设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
            result.KeepAlive = false;
            return result;
        }

        ///// <summary>
        ///// 向Ftp服务器上传文件并创建和本地相同的目录结构
        ///// 遍历目录和子目录的文件
        ///// </summary>
        ///// <param name="file"></param>
        //private void GetFileSystemInfos(FileSystemInfo file)
        //{
        //    string getDirecName = file.Name;
        //    if (!ftpIsExistsFile(getDirecName, "192.168.0.172", "Anonymous", "") && file.Name.Equals(FileName))
        //    {
        //        MakeDir(getDirecName, "192.168.0.172", "Anonymous", "");
        //    }
        //    if (!file.Exists) return;
        //    DirectoryInfo dire = file as DirectoryInfo;
        //    if (dire == null) return;
        //    FileSystemInfo[] files = dire.GetFileSystemInfos();

        //    for (int i = 0; i < files.Length; i++)
        //    {
        //        FileInfo fi = files[i] as FileInfo;
        //        if (fi != null)
        //        {
        //            DirectoryInfo DirecObj = fi.Directory;
        //            string DireObjName = DirecObj.Name;
        //            if (FileName.Equals(DireObjName))
        //            {
        //                UploadFile(fi, DireObjName, "192.168.0.172", "Anonymous", "");
        //            }
        //            else
        //            {
        //                Match m = Regex.Match(files[i].FullName, FileName + "+.*" + DireObjName);
        //                //UploadFile(fi, FileName+"/"+DireObjName, "192.168.0.172", "Anonymous", "");
        //                UploadFile(fi, m.ToString(), "192.168.0.172", "Anonymous", "");
        //            }
        //        }
        //        else
        //        {
        //            string[] ArrayStr = files[i].FullName.Split('\\');
        //            string finame = files[i].Name;
        //            Match m = Regex.Match(files[i].FullName, FileName + "+.*" + finame);
        //            //MakeDir(ArrayStr[ArrayStr.Length - 2].ToString() + "/" + finame, "192.168.0.172", "Anonymous", "");
        //            MakeDir(m.ToString(), "192.168.0.172", "Anonymous", "");
        //            GetFileSystemInfos(files[i]);
        //        }
        //    }
        //}

        /// <summary>
        /// 判断ftp服务器上该目录是否存在
        /// </summary>
        /// <param name="dirName"></param>
        /// <param name="ftpHostIP"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        private bool ftpIsExistsFile(string dirName, string ftpHostIP, string username, string password)
        {
            bool flag = true;
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.ListDirectory;

                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception)
            {
                flag = false;
            }
            return flag;
        }
    }
}