一、开篇之前，先给大家推荐一款好用的FTP工具：FTP客户端—IIs7服务器管理工具
--官网地址：?cmc-zc
作为FTP客户端，它支持批量管理ftp站点。定时上传和定时下载，定时备份，且操作简洁。同时iis7服务器管理工具还是vnc客户端。并且支持批量管理管理windows及linux服务器、vps。让服务器真正实现了一站式管理，真的是非常方便。
这款软件功能丰富，主要有：
1、自动重连
2、自动重传
3、定时任务 （定时上传、定时下载）
4、自定义传输模式，线程，编码
5、删除到回收站
6、大量文件快速加载，边加载边传输
7、批量连接一键关闭
接下来来欣赏下界面：
二、下面是.net 常用的文件上传帮助类：
下载： 文件操作类 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Windows.Forms; using System.Configuration; using System.Net; namespace FTP文件上传 { class FileOperate { private static FileOperate _fileOperate = null; private string _filePath = string.Empty; public string FilePath { get { return _filePath; } private set { _filePath = value; } } private FileInfo fileInfo = null; public string[] files = null; public static FileOperate GetInstance() { if (_fileOperate == null) _fileOperate = new FileOperate(); return _fileOperate; } public void OpenFile() { OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = "文本文件|*.*|C#文件|*.cs|所有文件|*.*|文件夹|*.File folder"; ofd.RestoreDirectory = true; ofd.Multiselect = true; ofd.FilterIndex = 1; if (ofd.ShowDialog() == DialogResult.OK) { files = ofd.FileNames; } } public void UpLoadFile(string LocalfileName) { if (string.IsNullOrEmpty(LocalfileName)) return; string url = GetUrl(ConfigManager.HostName, ConfigManager.TargetDir); System.Net.FtpWebRequest ftp = GetRequest(url); //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; fileInfo = new FileInfo(LocalfileName); //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(); } } ftp = null; //设置FTP命令 ftp = GetRequest(url); ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名 ftp.RenameTo = fileInfo.Name; try { ftp.GetResponse(); } catch (Exception ex) { ftp = GetRequest(url); ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除 ftp.GetResponse(); throw ex; } finally { ftp = null; fileInfo.Delete(); } // 可以记录一个日志 "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "http://www.likecs.com/" + targetDir + "http://www.likecs.com/" + fileinfo.Name + "成功." ); } /// <summary> /// 下载文件 /// </summary> /// <param>Ftp的文件目录</param> /// <param>Ftp上的文件名称</param> /// <param>本地的文件目录</param> public void DownLoadFile(string FtpFilePath,string FtpFileName,string localFilePath) { if (!IsExistDir(FtpFilePath+"http://www.likecs.com/"+FtpFileName)) return; string url = "ftp://" + ConfigManager.HostName + FtpFilePath+"http://www.likecs.com/"+FtpFileName; FtpWebRequest ftp = GetRequest(url); ftp.Method = WebRequestMethods.Ftp.DownloadFile; ftp.UseBinary = true; ftp.UsePassive = true; using(FtpWebResponse response = (FtpWebResponse)ftp.GetResponse()) { using(Stream rsp = response.GetResponseStream()) { localFilePath = localFilePath + @"\" + FtpFileName; using(FileStream fs = new FileStream(localFilePath,FileMode.OpenOrCreate)) { try { byte[] buffer = new byte[2048]; int read = 0; do { read = rsp.Read(buffer, 0, buffer.Length); fs.Write(buffer, 0, read); } while (!(read == 0)); fs.Flush(); fs.Close(); } catch { //失败删除文件 fs.Close(); fileInfo = new FileInfo(localFilePath); fileInfo.Delete(); } } } } } private static string GetUrl(string hostName, string targetDir) { string target = Guid.NewGuid().ToString(); return "FTP://" + hostName + "http://www.likecs.com/" + targetDir + "http://www.likecs.com/" + target; } private static FtpWebRequest GetRequest(string url) { //根据服务器信息FtpWebRequest创建类的对象 FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(url); //提供身份验证信息 result.Credentials = new System.Net.NetworkCredential(ConfigManager.UserName, ConfigManager.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; } public List<string> GetDirectorysAndFiles(string requestPath) { var dict = new List<string>(); if (!IsExistDir(requestPath)) return dict; try { string url = "ftp://" + ConfigManager.HostName + requestPath; FtpWebRequest ftp = GetRequest(url); ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails; var response = ftp.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); while (line != null) { line = line.Substring(line.LastIndexOf(\' \') + 1); dict.Add(line); line = reader.ReadLine(); } ftp = null; response.Close(); } catch { } return dict; } private Boolean IsExistDir(string requestPath) { try { string url = "ftp://" + ConfigManager.HostName + "http://www.likecs.com/" + requestPath; FtpWebRequest ftp = GetRequest(url); ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails; var response = ftp.GetResponse(); response.Close(); } catch { return false; } return true; } } } using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Configuration; namespace FTP文件上传 { class ConfigManager { //上传 public static string HostName = ConfigurationManager.AppSettings["HostName"]; public static string UserName = ConfigurationManager.AppSettings["UserName"]; public static string Password = ConfigurationManager.AppSettings["Password"]; public static string TargetDir = ConfigurationManager.AppSettings["TargetDir"]; //下载 //D:\ftp\New folder\Newfolder public static string SourceDir = @"/New folder/Newfolder";//一级目录前不加/ //目标文件夹路径 public static string LoadTargetDir = @"D:\buck"; } } 调用 // FileOperate.GetInstance().GetDirectorysAndFiles(); // FileOperate.GetInstance().OpenFile(); //MessageBox.Show(FileOperate.GetInstance().FilePath); // var file = FileOperate.GetInstance().files; // FileOperate.GetInstance().UpLoadFile("ss"); // FileOperate.GetInstance().GetDirectorysAndFiles("/New folder/Newfolder"); FileOperate.GetInstance().DownLoadFile(@"/New folder/Newfolder", "11.zip", @"D:\buck"); // MessageBox.Show();