This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You could use the Jakarta Commons HttpClient, which is a very useful library for HTTP networking in Java. Another, perfectly valid option, would be to write your own "HTTP POST sender" by Googling for some samples.