View Javadoc

1   /*
2    * Copyright 2001-2005 The Apache Software Foundation
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package examples;
17  
18  import java.io.FileInputStream;
19  import java.io.FileOutputStream;
20  import java.io.IOException;
21  import java.io.InputStream;
22  import java.io.OutputStream;
23  import java.io.PrintWriter;
24  import org.apache.commons.net.ftp.FTP;
25  import org.apache.commons.net.ftp.FTPClient;
26  import org.apache.commons.net.ftp.FTPConnectionClosedException;
27  import org.apache.commons.net.ftp.FTPReply;
28  
29  /***
30   * This is an example program demonstrating how to use the FTPClient class.
31   * This program connects to an FTP server and retrieves the specified
32   * file.  If the -s flag is used, it stores the local file at the FTP server.
33   * Just so you can see what's happening, all reply strings are printed.
34   * If the -b flag is used, a binary transfer is assumed (default is ASCII).
35   * <p>
36   * Usage: ftp [-s] [-b] <hostname> <username> <password> <remote file> <local file>
37   * <p>
38   ***/
39  public final class ftp
40  {
41  
42      public static final String USAGE =
43          "Usage: ftp [-s] [-b] <hostname> <username> <password> <remote file> <local file>\n" +
44          "\nDefault behavior is to download a file and use ASCII transfer mode.\n" +
45          "\t-s store file on server (upload)\n" +
46          "\t-b use binary transfer mode\n";
47  
48      public static final void main(String[] args)
49      {
50          int base = 0;
51          boolean storeFile = false, binaryTransfer = false, error = false;
52          String server, username, password, remote, local;
53          FTPClient ftp;
54  
55          for (base = 0; base < args.length; base++)
56          {
57              if (args[base].startsWith("-s"))
58                  storeFile = true;
59              else if (args[base].startsWith("-b"))
60                  binaryTransfer = true;
61              else
62                  break;
63          }
64  
65          if ((args.length - base) != 5)
66          {
67              System.err.println(USAGE);
68              System.exit(1);
69          }
70  
71          server = args[base++];
72          username = args[base++];
73          password = args[base++];
74          remote = args[base++];
75          local = args[base];
76  
77          ftp = new FTPClient();
78          ftp.addProtocolCommandListener(new PrintCommandListener(
79                                             new PrintWriter(System.out)));
80  
81          try
82          {
83              int reply;
84              ftp.connect(server);
85              System.out.println("Connected to " + server + ".");
86  
87              // After connection attempt, you should check the reply code to verify
88              // success.
89              reply = ftp.getReplyCode();
90  
91              if (!FTPReply.isPositiveCompletion(reply))
92              {
93                  ftp.disconnect();
94                  System.err.println("FTP server refused connection.");
95                  System.exit(1);
96              }
97          }
98          catch (IOException e)
99          {
100             if (ftp.isConnected())
101             {
102                 try
103                 {
104                     ftp.disconnect();
105                 }
106                 catch (IOException f)
107                 {
108                     // do nothing
109                 }
110             }
111             System.err.println("Could not connect to server.");
112             e.printStackTrace();
113             System.exit(1);
114         }
115 
116 __main:
117         try
118         {
119             if (!ftp.login(username, password))
120             {
121                 ftp.logout();
122                 error = true;
123                 break __main;
124             }
125 
126             System.out.println("Remote system is " + ftp.getSystemName());
127 
128             if (binaryTransfer)
129                 ftp.setFileType(FTP.BINARY_FILE_TYPE);
130 
131             // Use passive mode as default because most of us are
132             // behind firewalls these days.
133             ftp.enterLocalPassiveMode();
134 
135             if (storeFile)
136             {
137                 InputStream input;
138 
139                 input = new FileInputStream(local);
140 
141                 ftp.storeFile(remote, input);
142 
143                 input.close();
144             }
145             else
146             {
147                 OutputStream output;
148 
149                 output = new FileOutputStream(local);
150 
151                 ftp.retrieveFile(remote, output);
152 
153                 output.close();
154             }
155 
156             ftp.logout();
157         }
158         catch (FTPConnectionClosedException e)
159         {
160             error = true;
161             System.err.println("Server closed connection.");
162             e.printStackTrace();
163         }
164         catch (IOException e)
165         {
166             error = true;
167             e.printStackTrace();
168         }
169         finally
170         {
171             if (ftp.isConnected())
172             {
173                 try
174                 {
175                     ftp.disconnect();
176                 }
177                 catch (IOException f)
178                 {
179                     // do nothing
180                 }
181             }
182         }
183 
184         System.exit(error ? 1 : 0);
185     } // end main
186 
187 }
188