recently i am creating a webservice in php that can send sms using way2sms gateway.
this is one grate way to send sms using java or php
for java code visit:---
and download java code...using json parser

http://youngstercarrer.com/smsapi/javasmsapi.php

if u wish u can use java httpconnection to send sms directly with following url.[ code can be find here.. http://youngstercarrer.com/smsapi/javasmshttp.php ]

youngstercarrer.com/.../sms_http.php?username="+ username +"&password="+ password +"&to=" + phoneNumber + "&msg=" + URLEncoder.encode(msg)