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    1   package examples;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
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    19   *    distribution.
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    25   *    Alternately, this acknowledgment may appear in the software itself,
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    56
    57  import java.io.IOException;
    58  import java.io.PrintWriter;
    59  import java.net.InetAddress;
    60  import org.apache.commons.net.ProtocolCommandListener;
    61  import org.apache.commons.net.ftp.FTPClient;
    62  import org.apache.commons.net.ftp.FTPReply;
    63
    64  /****
    65   * This is an example program demonstrating how to use the FTPClient class.
    66   * This program arranges a server to server file transfer that transfers
    67   * a file from host1 to host2.  Keep in mind, this program might only work
    68   * if host2 is the same as the host you run it on (for security reasons,
    69   * some ftp servers only allow PORT commands to be issued with a host
    70   * argument equal to the client host).
    71   * <p>
    72   * Usage: ftp <host1> <user1> <pass1> <file1> <host2> <user2> <pass2> <file2>
    73   * <p>
    74   ***/
    75  public final class server2serverFTP
    76  {
    77
    78      public static final void main(String[] args)
    79      {
    80          String server1, username1, password1, file1;
    81          String server2, username2, password2, file2;
    82          FTPClient ftp1, ftp2;
    83          ProtocolCommandListener listener;
    84
    85          if (args.length < 8)
    86          {
    87              System.err.println(
    88                  "Usage: ftp <host1> <user1> <pass1> <file1> <host2> <user2> <pass2> <file2>"
    89              );
    90              System.exit(1);
    91          }
    92
    93          server1 = args[0];
    94          username1 = args[1];
    95          password1 = args[2];
    96          file1 = args[3];
    97          server2 = args[4];
    98          username2 = args[5];
    99          password2 = args[6];
    100         file2 = args[7];
    101
    102         listener = new PrintCommandListener(new PrintWriter(System.out));
    103         ftp1 = new FTPClient();
    104         ftp1.addProtocolCommandListener(listener);
    105         ftp2 = new FTPClient();
    106         ftp2.addProtocolCommandListener(listener);
    107
    108         try
    109         {
    110             int reply;
    111             ftp1.connect(server1);
    112             System.out.println("Connected to " + server1 + ".");
    113
    114             reply = ftp1.getReplyCode();
    115
    116             if (!FTPReply.isPositiveCompletion(reply))
    117             {
    118                 ftp1.disconnect();
    119                 System.err.println("FTP server1 refused connection.");
    120                 System.exit(1);
    121             }
    122         }
    123         catch (IOException e)
    124         {
    125             if (ftp1.isConnected())
    126             {
    127                 try
    128                 {
    129                     ftp1.disconnect();
    130                 }
    131                 catch (IOException f)
    132                 {
    133                     // do nothing
    134                 }
    135             }
    136             System.err.println("Could not connect to server1.");
    137             e.printStackTrace();
    138             System.exit(1);
    139         }
    140
    141         try
    142         {
    143             int reply;
    144             ftp2.connect(server2);
    145             System.out.println("Connected to " + server2 + ".");
    146
    147             reply = ftp2.getReplyCode();
    148
    149             if (!FTPReply.isPositiveCompletion(reply))
    150             {
    151                 ftp2.disconnect();
    152                 System.err.println("FTP server2 refused connection.");
    153                 System.exit(1);
    154             }
    155         }
    156         catch (IOException e)
    157         {
    158             if (ftp2.isConnected())
    159             {
    160                 try
    161                 {
    162                     ftp2.disconnect();
    163                 }
    164                 catch (IOException f)
    165                 {
    166                     // do nothing
    167                 }
    168             }
    169             System.err.println("Could not connect to server2.");
    170             e.printStackTrace();
    171             System.exit(1);
    172         }
    173
    174 __main:
    175         try
    176         {
    177             if (!ftp1.login(username1, password1))
    178             {
    179                 System.err.println("Could not login to " + server1);
    180                 break __main;
    181             }
    182
    183             if (!ftp2.login(username2, password2))
    184             {
    185                 System.err.println("Could not login to " + server2);
    186                 break __main;
    187             }
    188
    189             // Let's just assume success for now.
    190             ftp2.enterRemotePassiveMode();
    191
    192             ftp1.enterRemoteActiveMode(InetAddress.getByName(ftp2.getPassiveHost()),
    193                                        ftp2.getPassivePort());
    194
    195             // Although you would think the store command should be sent to server2
    196             // first, in reality, ftp servers like wu-ftpd start accepting data
    197             // connections right after entering passive mode.  Additionally, they
    198             // don't even send the positive preliminary reply until after the
    199             // transfer is completed (in the case of passive mode transfers).
    200             // Therefore, calling store first would hang waiting for a preliminary
    201             // reply.
    202             if (ftp1.remoteRetrieve(file1) && ftp2.remoteStoreUnique(file2))
    203             {
    204                 //      if(ftp1.remoteRetrieve(file1) && ftp2.remoteStore(file2)) {
    205                 // We have to fetch the positive completion reply.
    206                 ftp1.completePendingCommand();
    207                 ftp2.completePendingCommand();
    208             }
    209             else
    210             {
    211                 System.err.println(
    212                     "Couldn't initiate transfer.  Check that filenames are valid.");
    213                 break __main;
    214             }
    215
    216         }
    217         catch (IOException e)
    218         {
    219             e.printStackTrace();
    220             System.exit(1);
    221         }
    222         finally
    223         {
    224             try
    225             {
    226                 if (ftp1.isConnected())
    227                 {
    228                     ftp1.logout();
    229                     ftp1.disconnect();
    230                 }
    231             }
    232             catch (IOException e)
    233             {
    234                 // do nothing
    235             }
    236
    237             try
    238             {
    239                 if (ftp2.isConnected())
    240                 {
    241                     ftp2.logout();
    242                     ftp2.disconnect();
    243                 }
    244             }
    245             catch (IOException e)
    246             {
    247                 // do nothing
    248             }
    249         }
    250     }
    251 }

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