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.
Get the value AFTER you submit it? That would be a server-side question. Since you mention Java, I suggest you ask in the Java forum. All values are packaged in the RESPONSE object, but that object is exposed in different ways in different languages.