Java liblaray
써보니까 JSON라이브러리중 제일 좋은거같다.
Down: https://code.google.com/p/google-gson/
Doc : https://sites.google.com/site/gson/
https://sites.google.com/site/gson/gson-user-guide
How To Convert Java Object To / From JSON (Gson) :http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format-gson-api/