How to transfer file from 1 to another pc using tcp/ip ?

no sir u didnt got my point, i want to do program for tcp/ip socket to send files over wifi. 
i am working for barcode scanner device which gives me barcode number and i want to extract file from database related to that barcode number to the same device with the use of java socket programming over wifi connection. i know its a tough task bt i want just idea from experts because im a fresher i dont know much about sockets.

hi priyanka,
install ipmsg in your pc. it is very useful for fast transfer of file and folder from one pc to another.