FtpClient Connection Timeouts

FtpClientConnectionTimeouts.groovy

import org.apache.commons.net.ftp.*
import java.io.InputStream
import java.io.ByteArrayInputStream

String ftphost = "127.0.0.1"
String ftpuser = "test"
String ftppwd = "test"

int ftpport = 21

String ftpDir = "tmp/FTP"

int TENSECONDS  = 10*1000
int THIRTYSECONDS = 30*1000


//Declare FTP client
FTPClient ftp = new FTPClient()

try 
{
  ftp.setConnectTimeout(TENSECONDS)
  ftp.setDefaultTimeout(TENSECONDS)
  ftp.connect(ftphost, ftpport)

  //30 seconds to log on.  Also 30 seconds to change to working directory.
  ftp.setSoTimeout(THIRTYSECONDS)
  
  def reply = ftp.getReplyCode()

  if (!FTPReply.isPositiveCompletion(reply)) 
  {
    throw new Exception("Unable to connect to FTP server")
  }

  if (!ftp.login(ftpuser, ftppwd)) 
  {
    throw new Exception("Unable to login to FTP server")
  }

  if (!ftp.changeWorkingDirectory(ftpDir))
  {
    throw new Exception("Unable to change working directory on FTP server")
  }

  //Change the timeout here for a large file transfer that will take over 30 seconds
  //ftp.setSoTimeout(THIRTYSECONDS);
   
  ftp.setFileType(FTPClient.ASCII_FILE_TYPE)
  ftp.enterLocalPassiveMode()

  String filetxt = "Some String file content"
  InputStream is = new ByteArrayInputStream(filetxt.getBytes('US-ASCII'))

  try
  {
    if (!ftp.storeFile("myFile.txt", is)) 
    {
      throw new Exception("Unable to write file to FTP server")
    }
  //Make sure to always close the inputStream
  }
  finally 
  {
    is.close()
  }

} 
catch(Exception e) 
{
  //handle exceptions here by logging or auditing
  
} 
finally 
{
  
  //if the IO is timed out or force disconnected, exceptions may be thrown when trying to logout/disconnect
  try 
  {

    //10 seconds to log off.  Also 10 seconds to disconnect.
    ftp.setSoTimeout(TENSECONDS);
    ftp.logout();

    //depending on the state of the server the .logout() may throw an exception,
    //we want to ensure complete disconnect.
  } 
  catch(Exception innerException)
  {
    
    //You potentially just want to log that there was a logout exception.
    
  }
  finally 
  {
    //Make sure to always disconnect.  If not, there is a chance you will leave hanging sockects
    ftp.disconnect();
  }
}
return true