c#实现FTP上传

  1         /// <summary>
  2         /// 上传文件
  3         /// </summary>
  4         /// <param name="fileinfo">需要上传的文件</param>
  5         /// <param name="targetDir">目标路径</param>
  6         /// <param name="hostname">ftp地址</param>
  7         /// <param name="username">ftp用户名</param>
  8         /// <param name="password">ftp密码</param>
  9         public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
 10         {
 11             //1. check target
 12             string target;
 13             if (targetDir.Trim() == "")
 14             {
 15                 return;
 16             }
 17             target = Guid.NewGuid().ToString();  //使用临时文件名
 18 
 19 
 20             string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
 21             ///WebClient webcl = new WebClient();
 22             System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
 23 
 24             //设置FTP命令 设置所要执行的FTP命令，
 25             //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
 26             ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
 27             //指定文件传输的数据类型
 28             ftp.UseBinary = true;
 29             ftp.UsePassive = true;
 30 
 31             //告诉ftp文件大小
 32             ftp.ContentLength = fileinfo.Length;
 33             //缓冲大小设置为2KB
 34             const int BufferSize = 2048;
 35             byte[] content = new byte[BufferSize - 1 + 1];
 36             int dataRead;
 37 
 38             //打开一个文件流 (System.IO.FileStream) 去读上传的文件
 39             using (FileStream fs = fileinfo.OpenRead())
 40             {
 41                 try
 42                 {
 43                     //把上传的文件写入流
 44                     using (Stream rs = ftp.GetRequestStream())
 45                     {
 46                         do
 47                         {
 48                             //每次读文件流的2KB
 49                             dataRead = fs.Read(content, 0, BufferSize);
 50                             rs.Write(content, 0, dataRead);
 51                         } while (!(dataRead < BufferSize));
 52                         rs.Close();
 53                     }
 54 
 55                 }
 56                 catch (Exception ex) { }
 57                 finally
 58                 {
 59                     fs.Close();
 60                 }
 61 
 62             }
 63 
 64             ftp = null;
 65             //设置FTP命令
 66             ftp = GetRequest(URI, username, password);
 67             ftp.Method = System.Net.WebRequestMethods.Ftp.Rename; //改名
 68             ftp.RenameTo = fileinfo.Name;
 69             try
 70             {
 71                 ftp.GetResponse();
 72             }
 73             catch (Exception ex)
 74             {
 75                 ftp = GetRequest(URI, username, password);
 76                 ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile; //删除
 77                 ftp.GetResponse();
 78                 throw ex;
 79             }
 80             finally
 81             {
 82                 //fileinfo.Delete();
 83             }
 84 
 85             // 可以记录一个日志  "上传" + fileinfo.FullName + "上传到" + "FTP://" + hostname + "/" + targetDir + "/" + fileinfo.Name + "成功." );
 86             ftp = null;
 87 
 88             #region
 89             /*****
 90              *FtpWebResponse
 91              * ****/
 92             //FtpWebResponse ftpWebResponse = (FtpWebResponse)ftp.GetResponse();
 93             #endregion
 94         }
 95 
 96         private static FtpWebRequest GetRequest(string URI, string username, string password)
 97         {
 98             //根据服务器信息FtpWebRequest创建类的对象
 99             FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
100             //提供身份验证信息
101             result.Credentials = new System.Net.NetworkCredential(username, password);
102             //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
103             result.KeepAlive = false;
104             return result;
105         }