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Ftp Access from java

Posted on 2004-04-06
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Last Modified: 2008-02-01
Experts

I want to know if anyone has a simple library that:

Retrieve a file from ftp.
write a file to ftp.
get a directory listing.

Thanks.
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Question by:Havalchy
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7 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 10765153
Here's some upload code:

import sun.net.ftp.*;

      class Uploader  {
            FtpClient client;

            private int imageNumber;


            /**
             *  Log in to server
             */
            private void login() {
                  try {
                        client = new FtpClient(FTP_URL);
                        client.login("username", "password");
                  }
                  catch (Exception e) {
                        e.printStackTrace();
                  }

            }

            private void upload(BufferedImage image) {
                  try {
                        TelnetOutputStream out = client.put(IMAGE_URL);
                        ImageIO.write(image, "JPG", out);
                        out.close();
                  }
                  catch (Exception e) {
                        e.printStackTrace();
                  }
            }
      }


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LVL 86

Expert Comment

by:CEHJ
ID: 10765162
...and some complete listing code:



import sun.net.ftp.*;
import java.io.*;
import java.util.*;
import sun.net.*;


public class FtpList {
  String username = "anonymous";
  String password = "ident";


  public static void main(String[] args){
    if(args.length < 2){
     System.out.println("Usage: java FtpList <host> <remote directory>");
     System.exit(-1);
    }
    FtpClient client = null;
    TelnetInputStream tis = null;
    BufferedReader in = null;
    String fileName = null;
    try {
      client = new FtpClient(args[0]);
      client.login(USERNAME,PASSWORD);
      client.cd(args[1]);
      tis = client.list();
      in = new BufferedReader(new InputStreamReader(tis));
      ArrayList fileList = new ArrayList();
      while ((fileName = in.readLine()) != null){
        System.out.println(fileName);
        fileList.add(fileName);
      }
    }
    catch (IOException e){
      e.printStackTrace();
    }
    finally {
      try { in.close(); } catch(IOException e) { e.printStackTrace(); }
    }
 }

}
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LVL 1

Author Comment

by:Havalchy
ID: 10765486
CEHJ

do you have the function that retrieves a file from the ftp, also do you know of any well documented standard libraries, I could not find the documentation for the  Sun.net.ftp
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LVL 86

Accepted Solution

by:
CEHJ earned 200 total points
ID: 10765545
It would be basically the opposite of the upload one

put->get
TelnetOutputStream->TelnetInputStream


final int BUF_SIZE = 4096;
byte[] buffer = new byte[BUF_SIZE];
int bytesRead = -1;
while((bytesRead = in.read(buffer)) > -1) {
     out.write(buffer, 0, bytesRead); // out is a BufferedOutputStream on a file
}
// close both streams
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LVL 13

Assisted Solution

by:Webstorm
Webstorm earned 50 total points
ID: 10765693
You can also use the finj library :
  http://finj.sourceforge.net/test.php
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LVL 86

Expert Comment

by:CEHJ
ID: 10766468
8-)
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LVL 13

Expert Comment

by:Webstorm
ID: 10768549
:-)
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