FtpClient storeFile always return False

Question

Please figure this out. The code runs properly without any exception.

        FTPClient ftp = new FTPClient();
        ftp.connect(server);
        if(!ftp.l         


        

Answer 1

please add the apache library for this code this are the impoted class

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

rest import class is from java.io or java.net

public boolean upload(String server,String username,String password,File localfile ){
        boolean Store=false;
        try{
        FTPClient ftp = new FTPClient();
               // ftp.connect(server);
    /* you can use either code which is written above above or below code as ftp port 20 is used for the data transfer and port 21 is used for command and controlls */
           ftp.connect(InetAddress.getByName(server),21); 
    //here 'server' is your domain name of ftp server or url
                if(!ftp.login(username, password))
                {
                    ftp.logout();
                    return false;
                }
          ftp.sendNoOp();//used so server timeout exception will not rise
                int reply = ftp.getReplyCode();
                if (!FTPReply.isPositiveCompletion(reply))
                {
                    ftp.disconnect();
                    return false;
                }
              ftp.enterLocalPassiveMode(); /* just include this line here and your code will work fine */
                InputStream in = new FileInputStream(localfile);
              // ftp.setFileType(ftp.BINARY_FILE_TYPE, ftp.BINARY_FILE_TYPE);
               ftp.setFileType(FTP.BINARY_FILE_TYPE);
               // ftp.setFileTransferMode(ftp.BINARY_FILE_TYPE);
                Store = ftp.storeFile(destinationfile, in);
                in.close();
             //ftp.disconnect();
     //here logout will close the connection for you
                ftp.logout();

            }
            catch (Exception ex)
            {
                ex.printStackTrace();
                return false;
            }
        return Store;
    }

Answer 2

Try to use ftp.enterLocalPassiveMode(); before ftp.storeFile(destinationfile, in);

Answer 3

Modify you code to switch to passive mode before you transfer the file with storeFile() as follows:

...
ftp.setFileTransferMode(ftp.BINARY_FILE_TYPE);
ftp.enterLocalPassiveMode();//Switch to passive mode
Store = ftp.storeFile(destinationfile, in);
in.close();
...

Hope that helps.

Answer 4

The exact failure message can be found by calling FtpClient#getReplyCode(). From that page (my emphasis):

Immediately after connecting is the only real time you need to check the reply code (because connect is of type void). The convention for all the FTP command methods in FTPClient is such that they either return a boolean value or some other value. The boolean methods return true on a successful completion reply from the FTP server and false on a reply resulting in an error condition or failure. The methods returning a value other than boolean return a value containing the higher level data produced by the FTP command, or null if a reply resulted in an error condition or failure. If you want to access the exact FTP reply code causing a success or failure, you must call getReplyCode after a success or failure.

To see what a return code means, you can see Wikipedia: List of FTP server return codes.

Answer 5

Topic is quite old but maybe I will help to any other. I compared what FileZilla sends to FTP server and my program did. I needed to use ftp.enterLocalPassiveMode() to make it work, ftp.pasv() no good :)

And for debugging is better to use getReplyString() than only getReplyCode()