Question

I want to create a JSON object in java code and then pass it on to javascript/jquery for parsing(further processing).
I am using Struts 2 framework.

This has to be done at page load, not after a AJAX call.
How to access the JSON object (created in java) in javascript/jquery.

Also are any API’s for creating JSON object for java object??

Answer 1

You should check out the Google GSON library.

To convert an Object to a JSON string is as simple as:

Gson gson = new Gson();
String jsonString = gson.toJson(myObject);

For your use case (Struts 2), a simple solution would be to place the jsonString property in your Action, then refer to it in the JSP page as follows:

<!-- this goes into your .jsp -->
<script type="text/javascript">
    var myJsonObject = <s:property value="jsonString" default="[]" escape="false" />; 
</script>