java server client socket sending and reading data HELP!

Hello there i need help im making a mmorpg and i want to use sockets to send data to and from the client to my server so for example:

username is sent from client to server

server validates username then sends x and y location data

i was thinking of using POST or GET type things like you do on html or PHP but have no idea how to do this on java also i am new to java sockets and if any one has some code on how to do the sending of data through sockets can u please post :)

)) Just read about sockets protocols and http protocol. You will understand what you want to do. ) Because now you just don't understand what sockets is and http is. ))
Regard.

ok so i have made some code for the socket data will be sent like this "cmd=login,user=uname,pass=pwd" i know how to split the "," in the string but i am trying to split the "=" using this code:

String[] msg = clientCommand.split(",");

String temp_cmd1 = msg[0];
String[] temp_cmd2 = temp_cmd1.split("=");
String cmd = temp_cmd2[0];

You must do some code, which we can run. Can you tell what is clientCommand and what value does it have?

clientCommand is just a string which looks like this "cmd=login,user=username,pass=password"