dataTransmitter

Class FileTransferClient

java.lang.Object

dataTransmitter.FileTransferClient

public class FileTransferClient
extends java.lang.Object

The class FileTransferClient is used for transferring a particular file to the server.

Author:

Jacob Honoré Broberg, Kartheepan Balachandran (kba@es.aau.dk), Tomasz Bujlow (tbu@es.aau.dk)

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.String	clientId Identifier of the client.
private java.net.InetAddress	ip IP address of the server.
private static org.apache.log4j.Logger	log Used to log different events.
private java.net.Socket	mySocket Socket on the server used for file transfer.
private int	port TCP port on the server on which the file transmission occurs.

Constructor Summary

Constructors

Constructor and Description
FileTransferClient(java.lang.String ip, int port, java.lang.String clientId) Constructs the object.

Method Summary

Methods

Modifier and Type	Method and Description
private boolean	requestTransferPermission() Requests from the server permissions to transfer the file.
private void	transferFile(java.io.File myFile) Transfers the file to the server.
boolean	uploadFile(java.io.File myFile) Uploads file myFile to the server.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

private static org.apache.log4j.Logger log

Used to log different events.

mySocket

private java.net.Socket mySocket

Socket on the server used for file transfer.

ip

private java.net.InetAddress ip

IP address of the server.

port

private int port

TCP port on the server on which the file transmission occurs.

clientId

private java.lang.String clientId

Identifier of the client. It will be transferred to the server before any file transfer can occur.

Constructor Detail

FileTransferClient

public FileTransferClient(java.lang.String ip,
                  int port,
                  java.lang.String clientId)
                   throws java.io.IOException

Constructs the object.

Parameters:

ip - IP address of the server

port - TCP port on the server on which the file transmission occurs

clientId - identifier of the client

Throws:

java.io.IOException - if the IP address is invalid

Method Detail

uploadFile

public boolean uploadFile(java.io.File myFile)
                   throws java.io.FileNotFoundException

Uploads file myFile to the server. File can be transferred by transferFile only if permissions are granted by requestTransferPermission

Parameters:

myFile - file to be uploaded

Returns:

true if the upload succeeded, false otherwise

Throws:

java.io.FileNotFoundException - if the file to be transferred does not exist

requestTransferPermission

private boolean requestTransferPermission()
                                   throws java.io.IOException

Requests from the server permissions to transfer the file. Steps:
- send the client identifier to the server
- receive a reply message
- interpret the message if the permission was given or not

Returns:

true if the permission to transfer the file was granted, false otherwise

Throws:

java.io.IOException - if communication error between the client and the server occurs

transferFile

private void transferFile(java.io.File myFile)
                   throws java.io.FileNotFoundException,
                          java.io.IOException

Transfers the file to the server.

Parameters:

myFile - file to be transferred

Throws:

java.io.FileNotFoundException - if the file to be transferred does not exist

java.io.IOException - if communication error between the client and the server occurs