VB.net 2010 视频教程 VB.net 2010 视频教程 python基础视频教程
SQL Server 2008 视频教程 c#入门经典教程 Visual Basic从门到精通视频教程
当前位置:
首页 > 编程开发 > c#教程 >

  • C#教程之C#教程之分享用于操作FTP的客户端C#类

本站最新发布   C#从入门到精通
试听地址  https://www.xin3721.com/eschool/CSharpxin3721/

这是一个用于操作FTP的客户端C#类，类已经封装好了各种常用的Ftp操作方法，调用非常简单，你不需要关心ftp连接和操作的细节，只要调用这个类里的相关方法就可以了。

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;
using System.Threading;
 
namespace DotNet.Utilities
{
  public class FTPClient
  {
    public static object obj = new object();
 
    #region 构造函数
    /// <summary>
    /// 缺省构造函数
    /// </summary>
    public FTPClient()
    {
      strRemoteHost = "";
      strRemotePath = "";
      strRemoteUser = "";
      strRemotePass = "";
      strRemotePort = 21;
      bConnected = false;
    }
 
    /// <summary>
    /// 构造函数
    /// </summary>
    public FTPClient(string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort)
    {
      strRemoteHost = remoteHost;
      strRemotePath = remotePath;
      strRemoteUser = remoteUser;
      strRemotePass = remotePass;
      strRemotePort = remotePort;
      Connect();
    }
    #endregion
 
    #region 字段
    private int strRemotePort;
    private Boolean bConnected;
    private string strRemoteHost;
    private string strRemotePass;
    private string strRemoteUser;
    private string strRemotePath;
 
    /// <summary>
    /// 服务器返回的应答信息(包含应答码)
    /// </summary>
    private string strMsg;
    /// <summary>
    /// 服务器返回的应答信息(包含应答码)
    /// </summary>
    private string strReply;
    /// <summary>
    /// 服务器返回的应答码
    /// </summary>
    private int iReplyCode;
    /// <summary>
    /// 进行控制连接的socket
    /// </summary>
    private Socket socketControl;
    /// <summary>
    /// 传输模式
    /// </summary>
    private TransferType trType;
    /// <summary>
    /// 接收和发送数据的缓冲区
    /// </summary>
    private static int BLOCK_SIZE = 512;
    /// <summary>
    /// 编码方式
    /// </summary>
    Encoding ASCII = Encoding.ASCII;
    /// <summary>
    /// 字节数组
    /// </summary>
    Byte[] buffer = new Byte[BLOCK_SIZE];
    #endregion
 
    #region 属性
    /// <summary>
    /// FTP服务器IP地址
    /// </summary>
    public string RemoteHost
    {
      get
      {
        return strRemoteHost;
      }
      set
      {
        strRemoteHost = value;
      }
    }
 
    /// <summary>
    /// FTP服务器端口
    /// </summary>
    public int RemotePort
    {
      get
      {
        return strRemotePort;
      }
      set
      {
        strRemotePort = value;
      }
    }
 
    /// <summary>
    /// 当前服务器目录
    /// </summary>
    public string RemotePath
    {
      get
      {
        return strRemotePath;
      }
      set
      {
        strRemotePath = value;
      }
    }
 
    /// <summary>
    /// 登录用户账号
    /// </summary>
    public string RemoteUser
    {
      set
      {
        strRemoteUser = value;
      }
    }
 
    /// <summary>
    /// 用户登录密码
    /// </summary>
    public string RemotePass
    {
      set
      {
        strRemotePass = value;
      }
    }
 
    /// <summary>
    /// 是否登录
    /// </summary>
    public bool Connected
    {
      get
      {
        return bConnected;
      }
    }
    #endregion
 
    #region 链接
    /// <summary>
    /// 建立连接
    /// </summary>
    public void Connect()
    {
      lock (obj)
      {
        socketControl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
        try
        {
          socketControl.Connect(ep);
        }
        catch (Exception)
        {
          throw new IOException("不能连接ftp服务器");
        }
      }
      ReadReply();
      if (iReplyCode != 220)
      {
        DisConnect();
        throw new IOException(strReply.Substring(4));
      }
      SendCommand("USER " + strRemoteUser);
      if (!(iReplyCode == 331 || iReplyCode == 230))
      {
        CloseSocketConnect();
        throw new IOException(strReply.Substring(4));
      }
      if (iReplyCode != 230)
      {
        SendCommand("PASS " + strRemotePass);
        if (!(iReplyCode == 230 || iReplyCode == 202))
        {
          CloseSocketConnect();
          throw new IOException(strReply.Substring(4));
        }
      }
      bConnected = true;
      ChDir(strRemotePath);
    }
 
    /// <summary>
    /// 关闭连接
    /// </summary>
    public void DisConnect()
    {
      if (socketControl != null)
      {
        SendCommand("QUIT");
      }
      CloseSocketConnect();
    }
    #endregion
 
    #region 传输模式
    /// <summary>
    /// 传输模式:二进制类型、ASCII类型
    /// </summary>
    public enum TransferType { Binary, ASCII };
 
    /// <summary>
    /// 设置传输模式
    /// </summary>
    /// <param name="ttType">传输模式</param>
    public void SetTransferType(TransferType ttType)
    {
      if (ttType == TransferType.Binary)
      {
        SendCommand("TYPE I");//binary类型传输
      }
      else
      {
        SendCommand("TYPE A");//ASCII类型传输
      }
      if (iReplyCode != 200)
      {
        throw new IOException(strReply.Substring(4));
      }
      else
      {
        trType = ttType;
      }
    }
 
    /// <summary>
    /// 获得传输模式
    /// </summary>
    /// <returns>传输模式</returns>
    public TransferType GetTransferType()
    {
      return trType;
    }
    #endregion
 
    #region 文件操作
    /// <summary>
    /// 获得文件列表
    /// </summary>
    /// <param name="strMask">文件名的匹配字符串</param>
    public string[] Dir(string strMask)
    {
      if (!bConnected)
      {
        Connect();
      }
      Socket socketData = CreateDataSocket();
      SendCommand("NLST " + strMask);
      if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226))
      {
        throw new IOException(strReply.Substring(4));
      }
      strMsg = "";
      Thread.Sleep(2000);
      while (true)
      {
        int iBytes = socketData.Receive(buffer, buffer.Length, 0);
        strMsg += ASCII.GetString(buffer, 0, iBytes);
        if (iBytes < buffer.Length)
        {
          break;
        }
      }
      char[] seperator = { '\n' };
      string[] strsFileList = strMsg.Split(seperator);
      socketData.Close(); //数据socket关闭时也会有返回码
      if (iReplyCode != 226)
      {
        ReadReply();
        if (iReplyCode != 226)
        {
 
          throw new IOException(strReply.Substring(4));
        }
      }
      return strsFileList;
    }
 
    public void newPutByGuid(string strFileName, string strGuid)
    {
      if (!bConnected)
      {
        Connect();
      }
      string str = strFileName.Substring(0, strFileName.LastIndexOf("\\"));
      string strTypeName = strFileName.Substring(strFileName.LastIndexOf("."));
      strGuid = str + "\\" + strGuid;
      Socket socketData = CreateDataSocket();
      SendCommand("STOR " + Path.GetFileName(strGuid));
      if (!(iReplyCode == 125 || iReplyCode == 150))
      {
        throw new IOException(strReply.Substring(4));
      }
      FileStream input = new FileStream(strGuid, FileMode.Open);
      input.Flush();
      int iBytes = 0;
      while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0)
      {
        socketData.Send(buffer, iBytes, 0);
      }
      input.Close();
      if (socketData.Connected)
      {
        socketData.Close();
      }
      if (!(iReplyCode == 226 || iReplyCode == 250))
      {
        ReadReply();
        if (!(iReplyCode == 226 || iReplyCode == 250))
        {
          throw new IOException(strReply.Substring(4));
        }
      }
    }
 
    /// <summary>
    /// 获取文件大小
    /// </summary>
    /// <param name="strFileName">文件名</param>
    /// <returns>文件大小</returns>
    public long GetFileSize(string strFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("SIZE " + Path.GetFileName(strFileName));
      long lSize = 0;
      if (iReplyCode == 213)
      {
        lSize = Int64.Parse(strReply.Substring(4));
      }
      else
      {
        throw new IOException(strReply.Substring(4));
      }
      return lSize;
    }
 
 
    /// <summary>
    /// 获取文件信息
    /// </summary>
    /// <param name="strFileName">文件名</param>
    /// <returns>文件大小</returns>
    public string GetFileInfo(string strFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
      Socket socketData = CreateDataSocket();
      SendCommand("LIST " + strFileName);
      string strResult = "";
      if (!(iReplyCode == 150 || iReplyCode == 125
        || iReplyCode == 226 || iReplyCode == 250))
      {
        throw new IOException(strReply.Substring(4));
      }
      byte[] b = new byte[512];
      MemoryStream ms = new MemoryStream();
 
      while (true)
      {
        int iBytes = socketData.Receive(b, b.Length, 0);
        ms.Write(b, 0, iBytes);
        if (iBytes <= 0)
        {
 
          break;
        }
      }
      byte[] bt = ms.GetBuffer();
      strResult = System.Text.Encoding.ASCII.GetString(bt);
      ms.Close();
      return strResult;
    }
 
    /// <summary>
    /// 删除
    /// </summary>
    /// <param name="strFileName">待删除文件名</param>
    public void Delete(string strFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("DELE " + strFileName);
      if (iReplyCode != 250)
      {
        throw new IOException(strReply.Substring(4));
      }
    }
 
    /// <summary>
    /// 重命名(如果新文件名与已有文件重名,将覆盖已有文件)
    /// </summary>
    /// <param name="strOldFileName">旧文件名</param>
    /// <param name="strNewFileName">新文件名</param>
    public void Rename(string strOldFileName, string strNewFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("RNFR " + strOldFileName);
      if (iReplyCode != 350)
      {
        throw new IOException(strReply.Substring(4));
      }
      // 如果新文件名与原有文件重名,将覆盖原有文件
      SendCommand("RNTO " + strNewFileName);
      if (iReplyCode != 250)
      {
        throw new IOException(strReply.Substring(4));
      }
    }
    #endregion
 
    #region 上传和下载
    /// <summary>
    /// 下载一批文件
    /// </summary>
    /// <param name="strFileNameMask">文件名的匹配字符串</param>
    /// <param name="strFolder">本地目录(不得以\结束)</param>
    public void Get(string strFileNameMask, string strFolder)
    {
      if (!bConnected)
      {
        Connect();
      }
      string[] strFiles = Dir(strFileNameMask);
      foreach (string strFile in strFiles)
      {
        if (!strFile.Equals(""))//一般来说strFiles的最后一个元素可能是空字符串
        {
          Get(strFile, strFolder, strFile);
        }
      }
    }
 
    /// <summary>
    /// 下载一个文件
    /// </summary>
    /// <param name="strRemoteFileName">要下载的文件名</param>
    /// <param name="strFolder">本地目录(不得以\结束)</param>
    /// <param name="strLocalFileName">保存在本地时的文件名</param>
    public void Get(string strRemoteFileName, string strFolder, string strLocalFileName)
    {
      Socket socketData = CreateDataSocket();
      try
      {
        if (!bConnected)
        {
          Connect();
        }
        SetTransferType(TransferType.Binary);
        if (strLocalFileName.Equals(""))
        {
          strLocalFileName = strRemoteFileName;
        }
        SendCommand("RETR " + strRemoteFileName);
        if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226 || iReplyCode == 250))
        {
          throw new IOException(strReply.Substring(4));
        }
        FileStream output = new FileStream(strFolder + "\\" + strLocalFileName, FileMode.Create);
        while (true)
        {
          int iBytes = socketData.Receive(buffer, buffer.Length, 0);
          output.Write(buffer, 0, iBytes);
          if (iBytes <= 0)
          {
            break;
          }
        }
        output.Close();
        if (socketData.Connected)
        {
          socketData.Close();
        }
        if (!(iReplyCode == 226 || iReplyCode == 250))
        {
          ReadReply();
          if (!(iReplyCode == 226 || iReplyCode == 250))
          {
            throw new IOException(strReply.Substring(4));
          }
        }
      }
      catch
      {
        socketData.Close();
        socketData = null;
        socketControl.Close();
        bConnected = false;
        socketControl = null;
      }
    }
 
    /// <summary>
    /// 下载一个文件
    /// </summary>
    /// <param name="strRemoteFileName">要下载的文件名</param>
    /// <param name="strFolder">本地目录(不得以\结束)</param>
    /// <param name="strLocalFileName">保存在本地时的文件名</param>
    public void GetNoBinary(string strRemoteFileName, string strFolder, string strLocalFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
 
      if (strLocalFileName.Equals(""))
      {
        strLocalFileName = strRemoteFileName;
      }
      Socket socketData = CreateDataSocket();
      SendCommand("RETR " + strRemoteFileName);
      if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226 || iReplyCode == 250))
      {
        throw new IOException(strReply.Substring(4));
      }
      FileStream output = new FileStream(strFolder + "\\" + strLocalFileName, FileMode.Create);
      while (true)
      {
        int iBytes = socketData.Receive(buffer, buffer.Length, 0);
        output.Write(buffer, 0, iBytes);
        if (iBytes <= 0)
        {
          break;
        }
      }
      output.Close();
      if (socketData.Connected)
      {
        socketData.Close();
      }
      if (!(iReplyCode == 226 || iReplyCode == 250))
      {
        ReadReply();
        if (!(iReplyCode == 226 || iReplyCode == 250))
        {
          throw new IOException(strReply.Substring(4));
        }
      }
    }
 
    /// <summary>
    /// 上传一批文件
    /// </summary>
    /// <param name="strFolder">本地目录(不得以\结束)</param>
    /// <param name="strFileNameMask">文件名匹配字符(可以包含*和?)</param>
    public void Put(string strFolder, string strFileNameMask)
    {
      string[] strFiles = Directory.GetFiles(strFolder, strFileNameMask);
      foreach (string strFile in strFiles)
      {
        Put(strFile);
      }
    }
 
    /// <summary>
    /// 上传一个文件
    /// </summary>
    /// <param name="strFileName">本地文件名</param>
    public void Put(string strFileName)
    {
      if (!bConnected)
      {
        Connect();
      }
      Socket socketData = CreateDataSocket();
      if (Path.GetExtension(strFileName) == "")
        SendCommand("STOR " + Path.GetFileNameWithoutExtension(strFileName));
      else
        SendCommand("STOR " + Path.GetFileName(strFileName));
 
      if (!(iReplyCode == 125 || iReplyCode == 150))
      {
        throw new IOException(strReply.Substring(4));
      }
 
      FileStream input = new FileStream(strFileName, FileMode.Open);
      int iBytes = 0;
      while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0)
      {
        socketData.Send(buffer, iBytes, 0);
      }
      input.Close();
      if (socketData.Connected)
      {
        socketData.Close();
      }
      if (!(iReplyCode == 226 || iReplyCode == 250))
      {
        ReadReply();
        if (!(iReplyCode == 226 || iReplyCode == 250))
        {
          throw new IOException(strReply.Substring(4));
        }
      }
    }
 
 
    /// <summary>
    /// 上传一个文件
    /// </summary>
    /// <param name="strFileName">本地文件名</param>
    public void PutByGuid(string strFileName, string strGuid)
    {
      if (!bConnected)
      {
        Connect();
      }
      string str = strFileName.Substring(0, strFileName.LastIndexOf("\\"));
      string strTypeName = strFileName.Substring(strFileName.LastIndexOf("."));
      strGuid = str + "\\" + strGuid;
      System.IO.File.Copy(strFileName, strGuid);
      System.IO.File.SetAttributes(strGuid, System.IO.FileAttributes.Normal);
      Socket socketData = CreateDataSocket();
      SendCommand("STOR " + Path.GetFileName(strGuid));
      if (!(iReplyCode == 125 || iReplyCode == 150))
      {
        throw new IOException(strReply.Substring(4));
      }
      FileStream input = new FileStream(strGuid, FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
      int iBytes = 0;
      while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0)
      {
        socketData.Send(buffer, iBytes, 0);
      }
      input.Close();
      File.Delete(strGuid);
      if (socketData.Connected)
      {
        socketData.Close();
      }
      if (!(iReplyCode == 226 || iReplyCode == 250))
      {
        ReadReply();
        if (!(iReplyCode == 226 || iReplyCode == 250))
        {
          throw new IOException(strReply.Substring(4));
        }
      }
    }
    #endregion
 
    #region 目录操作
    /// <summary>
    /// 创建目录
    /// </summary>
    /// <param name="strDirName">目录名</param>
    public void MkDir(string strDirName)
    {
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("MKD " + strDirName);
      if (iReplyCode != 257)
      {
        throw new IOException(strReply.Substring(4));
      }
    }
 
    /// <summary>
    /// 删除目录
    /// </summary>
    /// <param name="strDirName">目录名</param>
    public void RmDir(string strDirName)
    {
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("RMD " + strDirName);
      if (iReplyCode != 250)
      {
        throw new IOException(strReply.Substring(4));
      }
    }
 
    /// <summary>
    /// 改变目录
    /// </summary>
    /// <param name="strDirName">新的工作目录名</param>
    public void ChDir(string strDirName)
    {
      if (strDirName.Equals(".") || strDirName.Equals(""))
      {
        return;
      }
      if (!bConnected)
      {
        Connect();
      }
      SendCommand("CWD " + strDirName);
      if (iReplyCode != 250)
      {
        throw new IOException(strReply.Substring(4));
      }
      this.strRemotePath = strDirName;
    }
    #endregion
 
    #region 内部函数
    /// <summary>
    /// 将一行应答字符串记录在strReply和strMsg,应答码记录在iReplyCode
    /// </summary>
    private void ReadReply()
    {
      strMsg = "";
      strReply = ReadLine();
      iReplyCode = Int32.Parse(strReply.Substring(0, 3));
    }
 
    /// <summary>
    /// 建立进行数据连接的socket
    /// </summary>
    /// <returns>数据连接socket</returns>
    private Socket CreateDataSocket()
    {
      SendCommand("PASV");
      if (iReplyCode != 227)
      {
        throw new IOException(strReply.Substring(4));
      }
      int index1 = strReply.IndexOf('(');
      int index2 = strReply.IndexOf(')');
      string ipData = strReply.Substring(index1 + 1, index2 - index1 - 1);
      int[] parts = new int[6];
      int len = ipData.Length;
      int partCount = 0;
      string buf = "";
      for (int i = 0; i < len && partCount <= 6; i++)
      {
        char ch = Char.Parse(ipData.Substring(i, 1));
        if (Char.IsDigit(ch))
          buf += ch;
        else if (ch != ',')
        {
          throw new IOException("Malformed PASV strReply: " + strReply);
        }
        if (ch == ',' || i + 1 == len)
        {
          try
          {
            parts[partCount++] = Int32.Parse(buf);
            buf = "";
          }
          catch (Exception)
          {
            throw new IOException("Malformed PASV strReply: " + strReply);
          }
        }
      }
      string ipAddress = parts[0] + "." + parts[1] + "." + parts[2] + "." + parts[3];
      int port = (parts[4] << 8) + parts[5];
      Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      IPEndPoint ep = new IPEndPoint(IPAddress.Parse(ipAddress), port);
      try
      {
        s.Connect(ep);
      }
      catch (Exception)
      {
        throw new IOException("无法连接ftp服务器");
      }
      return s;
    }
 
    /// <summary>
    /// 关闭socket连接(用于登录以前)
    /// </summary>
    private void CloseSocketConnect()
    {
      lock (obj)
      {
        if (socketControl != null)
        {
          socketControl.Close();
          socketControl = null;
        }
        bConnected = false;
      }
    }
 
    /// <summary>
    /// 读取Socket返回的所有字符串
    /// </summary>
    /// <returns>包含应答码的字符串行</returns>
    private string ReadLine()
    {
      lock (obj)
      {
        while (true)
        {
          int iBytes = socketControl.Receive(buffer, buffer.Length, 0);
          strMsg += ASCII.GetString(buffer, 0, iBytes);
          if (iBytes < buffer.Length)
          {
            break;
          }
        }
      }
      char[] seperator = { '\n' };
      string[] mess = strMsg.Split(seperator);
      if (strMsg.Length > 2)
      {
        strMsg = mess[mess.Length - 2];
      }
      else
      {
        strMsg = mess[0];
      }
      if (!strMsg.Substring(3, 1).Equals(" ")) //返回字符串正确的是以应答码(如220开头,后面接一空格,再接问候字符串)
      {
        return ReadLine();
      }
      return strMsg;
    }
 
    /// <summary>
    /// 发送命令并获取应答码和最后一行应答字符串
    /// </summary>
    /// <param name="strCommand">命令</param>
    public void SendCommand(String strCommand)
    {
      lock (obj)
      {
        Byte[] cmdBytes = Encoding.ASCII.GetBytes((strCommand + "\r\n").ToCharArray());
        socketControl.Send(cmdBytes, cmdBytes.Length, 0);
        Thread.Sleep(500);
        ReadReply();
      }
    }
    #endregion
  }
}

方法二：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;
namespace FtpLib
{
public class FTPFactory
{
  private string
  remoteHost, remotePath, remoteUser, remotePass, mes;
  private int remotePort, bytes;
  private Socket clientSocket;
  private int retValue;
  private Boolean debug;
  private Boolean logined;
  private string reply;
  private static int BLOCK_SIZE = 512;
  Byte[] buffer = new Byte[BLOCK_SIZE];
  Encoding ASCII = Encoding.ASCII;
  public FTPFactory()
  {
    remoteHost = "localhost";
    remotePath = ".";
    remoteUser = "anonymous";
    remotePass = "";
    remotePort = 21;
    debug = false;
    logined = false;
  }
  ///
 
  /// Set the name of the FTP server to connect to.
 
  ///
 
  /// Server name
 
  public void setRemoteHost(string remoteHost)
  {
    this.remoteHost = remoteHost;
  }
  ///
 
  /// Return the name of the current FTP server.
 
  ///
 
  /// Server name
 
  public string getRemoteHost()
  {
    return remoteHost;
  }
  ///
 
  /// Set the port number to use for FTP.
 
  ///
 
  /// Port number
 
  public void setRemotePort(int remotePort)
  {
    this.remotePort = remotePort;
  }
  ///
 
  /// Return the current port number.
 
  ///
 
  /// Current port number
 
  public int getRemotePort()
  {
    return remotePort;
  }
  ///
 
  /// Set the remote directory path.
 
  ///
 
  /// The remote directory path
 
  public void setRemotePath(string remotePath)
  {
    this.remotePath = remotePath;
  }
  ///
 
  /// Return the current remote directory path.
 
  ///
 
  /// The current remote directory path.
 
  public string getRemotePath()
  {
    return remotePath;
  }
  ///
 
  /// Set the user name to use for logging into the remote server.
 
  ///
 
  /// Username
 
  public void setRemoteUser(string remoteUser)
  {
    this.remoteUser = remoteUser;
  }
  ///
 
  /// Set the password to user for logging into the remote server.
 
  ///
 
  /// Password
 
  public void setRemotePass(string remotePass)
  {
    this.remotePass = remotePass;
  }
  ///
 
  /// Return a string array containing the remote directory's file list.
 
  ///
 
  ///
 
  ///
 
  public string[] getFileList(string mask)
  {
    if (!logined)
    {
      login();
    }
    Socket cSocket = createDataSocket();
    sendCommand("NLST " + mask);
    if (!(retValue == 150 || retValue == 125))
    {
      throw new IOException(reply.Substring(4));
    }
    mes = "";
    while (true)
    {
      int bytes = cSocket.Receive(buffer, buffer.Length, 0);
      mes += ASCII.GetString(buffer, 0, bytes);
      if (bytes < buffer.Length)
      {
        break;
      }
    }
    char[] seperator = { '\n' };
    string[] mess = mes.Split(seperator);
    cSocket.Close();
    readReply();
    if (retValue != 226)
    {
      throw new IOException(reply.Substring(4));
    }
    return mess;
  }
  ///
 
  /// Return the size of a file.
 
  ///
 
  ///
 
  ///
 
  public long getFileSize(string fileName)
  {
    if (!logined)
    {
      login();
    }
    sendCommand("SIZE " + fileName);
    long size = 0;
    if (retValue == 213)
    {
      size = Int64.Parse(reply.Substring(4));
    }
    else
    {
      throw new IOException(reply.Substring(4));
    }
    return size;
  }
  ///
 
  /// Login to the remote server.
 
  ///
 
  public void login()
  {
    clientSocket = new
    Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    IPEndPoint ep = new
    IPEndPoint(Dns.Resolve(remoteHost).AddressList[0], remotePort);
    try
    {
      clientSocket.Connect(ep);
    }
    catch (Exception)
    {
      throw new IOException("Couldn't connect to remote server");
    }
    readReply();
    if (retValue != 220)
    {
      close();
      throw new IOException(reply.Substring(4));
    }
    if (debug)
      Console.WriteLine("USER " + remoteUser);
    sendCommand("USER " + remoteUser);
    if (!(retValue == 331 || retValue == 230))
    {
      cleanup();
      throw new IOException(reply.Substring(4));
    }
    if (retValue != 230)
    {
      if (debug)
        Console.WriteLine("PASS xxx");
      sendCommand("PASS " + remotePass);
      if (!(retValue == 230 || retValue == 202))
      {
        cleanup();
        throw new IOException(reply.Substring(4));
      }
    }
    logined = true;
    Console.WriteLine("Connected to " + remoteHost);
    chdir(remotePath);
  }
  ///
 
  /// If the value of mode is true, set binary mode for downloads.
 
  /// Else, set Ascii mode.
 
  ///
 
  ///
 
  public void setBinaryMode(Boolean mode)
  {
    if (mode)
    {
      sendCommand("TYPE I");
    }
    else
    {
      sendCommand("TYPE A");
    }
    if (retValue != 200)
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Download a file to the Assembly's local directory,
 
  /// keeping the same file name.
 
  ///
 
  ///
 
  public void download(string remFileName)
  {
    download(remFileName, "", false);
  }
  ///
   /// Download a remote file to the Assembly's local directory,
 
  /// keeping the same file name, and set the resume flag.
 
  ///
 
  ///
 
  ///
 
  public void download(string remFileName, Boolean resume)
  {
    download(remFileName, "", resume);
  }
  ///
 
  /// Download a remote file to a local file name which can include
 
  /// a path. The local file name will be created or overwritten,
 
  /// but the path must exist.
 
  ///
 
  ///
 
  ///
 
  public void download(string remFileName, string locFileName)
  {
    download(remFileName, locFileName, false);
  }
  ///
 
  /// Download a remote file to a local file name which can include
 
  /// a path, and set the resume flag. The local file name will be
 
  /// created or overwritten, but the path must exist.
 
  ///
 
  ///
 
  ///
 
  ///
 
  public void download(string remFileName, string
  locFileName, Boolean resume)
  {
    if (!logined)
    {
      login();
    }
    setBinaryMode(true);
    Console.WriteLine("Downloading file " + remFileName + " from " + remoteHost + "/" + remotePath);
    if (locFileName.Equals(""))
    {
      locFileName = remFileName;
    }
    if (!File.Exists(locFileName))
    {
      Stream st = File.Create(locFileName);
      st.Close();
    }
    FileStream output = new
    FileStream(locFileName, FileMode.Open);
    Socket cSocket = createDataSocket();
    long offset = 0;
    if (resume)
    {
      offset = output.Length;
      if (offset > 0)
      {
        sendCommand("REST " + offset);
        if (retValue != 350)
        {
          //throw new IOException(reply.Substring(4));
 
          //Some servers may not support resuming.
 
          offset = 0;
        }
      }
      if (offset > 0)
      {
        if (debug)
        {
          Console.WriteLine("seeking to " + offset);
        }
        long npos = output.Seek(offset, SeekOrigin.Begin);
        Console.WriteLine("new pos=" + npos);
      }
    }
    sendCommand("RETR " + remFileName);
    if (!(retValue == 150 || retValue == 125) )
    {
      throw new IOException(reply.Substring(4));
    }
    while (true)
    {
      bytes = cSocket.Receive(buffer, buffer.Length, 0);
      output.Write(buffer, 0, bytes);
      if (bytes <= 0)
      {
        break;
      }
    }
    output.Close();
    if (cSocket.Connected)
    {
      cSocket.Close();
    }
    Console.WriteLine("");
    readReply();
    if (!(retValue == 226 || retValue == 250))
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Upload a file.
 
  ///
 
  ///
 
  public void upload(string fileName)
  {
    upload(fileName, false);
  }
  ///
 
  /// Upload a file and set the resume flag.
 
  ///
 
  ///
 
  ///
 
  public void upload(string fileName, Boolean resume)
  {
    if (!logined)
    {
      login();
    }
    Socket cSocket = createDataSocket();
    long offset = 0;
    if (resume)
    {
      try
      {
        setBinaryMode(true);
        offset = getFileSize(fileName);
      }
      catch (Exception)
      {
        offset = 0;
      }
    }
    if (offset > 0)
    {
      sendCommand("REST " + offset);
      if (retValue != 350)
      {
        //throw new IOException(reply.Substring(4));
 
        //Remote server may not support resuming.
 
        offset = 0;
      }
    }
    sendCommand("STOR " + Path.GetFileName(fileName));
    if (!(retValue == 125 || retValue == 150))
    {
      throw new IOException(reply.Substring(4));
    }
    // open input stream to read source file
 
    FileStream input = new
    FileStream(fileName, FileMode.Open);
    if (offset != 0)
    {
      if (debug)
      {
        Console.WriteLine("seeking to " + offset);
      }
      input.Seek(offset, SeekOrigin.Begin);
    }
    Console.WriteLine("Uploading file " + fileName + " to " + remotePath);
    while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0)
    {
      cSocket.Send(buffer, bytes, 0);
    }
    input.Close();
    Console.WriteLine("");
    if (cSocket.Connected)
    {
      cSocket.Close();
    }
    readReply();
    if (!(retValue == 226 || retValue == 250))
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Delete a file from the remote FTP server.
 
  ///
 
  ///
 
  public void deleteRemoteFile(string fileName)
  {
    if (!logined)
    {
      login();
    }
    sendCommand("DELE " + fileName);
    if (retValue != 250)
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Rename a file on the remote FTP server.
 
  ///
 
  ///
 
  ///
 
  public void renameRemoteFile(string oldFileName, string
  newFileName)
  {
    if (!logined)
    {
      login();
    }
    sendCommand("RNFR " + oldFileName);
    if (retValue != 350)
    {
      throw new IOException(reply.Substring(4));
    }
    // known problem
 
    // rnto will not take care of existing file.
 
    // i.e. It will overwrite if newFileName exist
 
    sendCommand("RNTO " + newFileName);
    if (retValue != 250)
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Create a directory on the remote FTP server.
 
  ///
 
  ///
 
  public void mkdir(string dirName)
  {
    if (!logined)
    {
      login();
    }
    sendCommand("MKD " + dirName);
    if (retValue != 257)
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Delete a directory on the remote FTP server.
 
  ///
 
  ///
 
  public void rmdir(string dirName)
  {
    if (!logined)
    {
      login();
    }
    sendCommand("RMD " + dirName);
    if (retValue != 250)
    {
      throw new IOException(reply.Substring(4));
    }
  }
  ///
 
  /// Change the current working directory on the remote FTP server.
 
  ///
 
  ///
 
  public void chdir(string dirName)
  {
    if (dirName.Equals("."))
    {
      return;
    }
    if (!logined)
    {
      login();
    }
    sendCommand("CWD " + dirName);
    if (retValue != 250)
    {
      throw new IOException(reply.Substring(4));
    }
    this.remotePath = dirName;
    Console.WriteLine("Current directory is " + remotePath);
  }
  ///
 
  /// Close the FTP connection.
 
  ///
 
  public void close()
  {
    if (clientSocket != null)
    {
      sendCommand("QUIT");
    }
    cleanup();
    Console.WriteLine("Closing...");
  }
  ///
 
  /// Set debug mode.
 
  ///
 
  ///
 
  public void setDebug(Boolean debug)
  {
    this.debug = debug;
  }
  private void readReply()
  {
    mes = "";
    reply = readLine();
    retValue = Int32.Parse(reply.Substring(0, 3));
  }
  private void cleanup()
  {
    if (clientSocket != null)
    {
      clientSocket.Close();
      clientSocket = null;
    }
    logined = false;
  }
  private string readLine()
  {
    while (true)
    {
      bytes = clientSocket.Receive(buffer, buffer.Length, 0);
      mes += ASCII.GetString(buffer, 0, bytes);
      if (bytes < buffer.Length)
      {
        break;
      }
    }
    char[] seperator = { '\n' };
    string[] mess = mes.Split(seperator);
    if (mes.Length > 2)
    {
      mes = mess[mess.Length - 2];
    }
    else
    {
      mes = mess[0];
    }
    if (!mes.Substring(3, 1).Equals(" "))
    {
      return readLine();
    }
    if (debug)
    {
      for (int k = 0; k < mess.Length - 1; k++)
      {
        Console.WriteLine(mess[k]);
      }
    }
    return mes;
  }
  private void sendCommand(String command)
  {
    Byte[] cmdBytes =
      //Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
 
    Encoding.Default.GetBytes((command + "\r\n").ToCharArray());
    clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
    readReply();
  }
  private Socket createDataSocket()
  {
    sendCommand("PASV");
    if (retValue != 227)
    {
      throw new IOException(reply.Substring(4));
    }
    int index1 = reply.IndexOf('(');
    int index2 = reply.IndexOf(')');
    string ipData =
    reply.Substring(index1 + 1, index2 - index1 - 1);
    int[] parts = new int[6];
    int len = ipData.Length;
    int partCount = 0;
    string buf = "";
    for (int i = 0; i < len && partCount <= 6; i++)
    {
      char ch = Char.Parse(ipData.Substring(i, 1));
      if (Char.IsDigit(ch))
        buf += ch;
      else if (ch != ',')
      {
        throw new IOException("Malformed PASV reply: " +
        reply);
      }
      if (ch == ',' || i + 1 == len)
      {
        try
        {
          parts[partCount++] = Int32.Parse(buf);
          buf = "";
        }
        catch (Exception)
        {
          throw new IOException("Malformed PASV reply: " +
          reply);
        }
      }
 }
    string ipAddress = parts[0] + "." + parts[1] + "." +
    parts[2] + "." + parts[3];
    int port = (parts[4] << 8) + parts[5];
    Socket s = new
    Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
    IPEndPoint ep = new
    IPEndPoint(Dns.Resolve(ipAddress).AddressList[0], port);
    try
    {
      s.Connect(ep);
    }
    catch (Exception)
    {
      throw new IOException("Can't connect to remote server");
    }
    return s;
  }
}
}

以上所述就是本文的全部内容了，希望大家能够喜欢。

相关教程