This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
It depends whether you wish to manipulate the JSON on the client or server-side.
If you want to access the values in Java code you will need to download the json-lib.jar from json.org and add it to you're classpath.There is documentation on the site to assist you.You can give you're jsonString to the constructor of the JSONArray class and then use it's retrieval methods to access the values.