utility for file transfer. It connects to the the FTP server, delete file, receive and put the file to the FTP server.

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

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;

import org.apache.log4j.Logger;

public class SandvineFTP {

private Logger logger = Logger.getLogger(SandvineFTP.class);

private static SandvineFTP sFTP;

FTPClient client = new FTPClient();

// make singleton

private SandvineFTP(){

}

public static SandvineFTP getInstance(){

if(sFTP==null)

sFTP =  new SandvineFTP();

return sFTP; 

}

// make connection with the server...

public boolean getConnection(String serverName, String uName, String pwd){

boolean result=false;

try {

client.connect(serverName);

int code = client.getReplyCode();

if(FTPReply.isPositiveCompletion(code)){

logger.info("successfully connected to remote server");

System.out.println("Connected to Server ... Code ::: "+ code);

}

result = client.login(uName,pwd);

}

catch(Exception e){

logger.error("Error ::: " + e.getMessage(),e);

e.printStackTrace();

}

return result;

}

// close connection

public void closeConnection(){

try {

client.disconnect();

} catch (IOException e) {

// TODO Auto-generated catch block

logger.error("Disconnect Error ::: " + e.getMessage(),e);

e.printStackTrace();

}

}

// list all files

public List listAllFiles(){

try {

FTPFile[] ftpFile = client.listFiles();

List fileNames = new ArrayList();

System.out.println(fileNames.size());

for(FTPFile file : ftpFile){

fileNames.add(file.getName());

}

} catch (IOException e) {

// TODO Auto-generated catch block

logger.error("List Error ::: " + e.getMessage(),e);

e.printStackTrace();

}

return null;

}

// change the working directory

public boolean changeWorkingDirectory(String dirName){

boolean result = false;

try {

result = client.changeWorkingDirectory(dirName);

} catch (IOException e) {

// TODO Auto-generated catch block

logger.error("Change Directory Error ::: " + e.getMessage(),e);

e.printStackTrace();

}

return result;

}

// delete the file

public String getCurrentWorkingDirectory(){

try {

return client.printWorkingDirectory();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

return null;

}

}

// put the file

public boolean putFile(String completePath){

boolean result = false;

try {

client.setFileType(FTP.ASCII_FILE_TYPE);

File f = new File(completePath);

if(f.exists()){

result = client.storeFile(f.getName(), new FileInputStream(f));

}

else

{

logger.info("File does not exist");

System.out.println("file does not exist");

}

}catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

logger.error("File Transfer Error ::: " + e.getMessage(),e);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

logger.error("File Transfer Error ::: " + e.getMessage(),e);

}

return result;

}

// receive the file

public InputStream getFile(String fileName){

InputStream iStream=null;

try {

client.setFileType(FTP.ASCII_FILE_TYPE);

iStream = client.retrieveFileStream(fileName);

// iStream.close();

System.out.println("File Transfer Successfull");

}catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

logger.error("File Transfer Error ::: " + e.getMessage(),e);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

logger.error("File Transfer Error ::: " + e.getMessage(),e);

}

return iStream;

}

public boolean deleteFile(String fileName){

boolean result=false;

try {

result = client.deleteFile(fileName);

} catch (IOException e) {

// TODO Auto-generated catch block

logger.error("File Transfer Error ::: " + e.getMessage(),e);

e.printStackTrace();

}

return result;

}

}