Connect and retrieve files

I need to connect to a machine [whose IP is known] and which need not be on the same network. Once connected, I have to retrieve a set of files [path of the directory is known] from the same and store in it some place in my machine. I am new to Java, so can some please help me out!!!

"scp" is for securely copying files between sides. It can be set up with keyparis so that it weill not ask for password, so it can be used in a batch environment like a shell script or executed from java.
User Commands                                              scp(1)
NAME
     scp - secure copy (remote file copy program)
SYNOPSIS
     scp [-pqrvC46] [-S program] [-P port] [-c cipher] [-i
     identity_file]   [-o   option]   [ [user1@]host1:]file1   [
     [user2@]host2:]file2 [...]
DESCRIPTION
     The scp utility copies files between hosts on a network. It
     uses ssh(1) for data transfer, and uses the same authentica-
     tion and provides the same security as ssh(1). Unlike
     rcp(1), scp will ask for passwords or passphrases if they
     are needed for authentication.

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Connect and retrieve files

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