Creating a JSON object in Java and accessing it in javascript/jquery

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??

check json.org/java/index.html

naresh
– naresh

2012-10-30 08:21:31 +00:00
Commented Oct 30, 2012 at 8:21 — naresh
– naresh, Commented Oct 30, 2012 at 8:21

Jensen Ching · Accepted Answer · 2012-10-30 08:19:30Z

4

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>

answered Oct 30, 2012 at 8:19

Jensen Ching

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6 Comments

Andrei Bârsan Over a year ago

And afterwards, you should mention methods of embedding that string in a template - usually done simply through an extra set of <script> tags defining a variable containing the JSON.

Jensen Ching Over a year ago

I added a quick method specifically for Struts 2.

Rachit Agrawal Over a year ago

@AndreiBârsan : 1 doubt, using this would convert the json object into string. So in javascript would i still be able to do something like jsonString.data1 , jsonString.data2.

Jensen Ching Over a year ago

@RachitAgrawal use the snippet above that I added :)

Rachit Agrawal Over a year ago

@JensenChing : Is there any way to write this Java object without using Gson lib, Actually i have told this can be acomplished using struts2 json pluggin. But I dont know how to do it.

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Community · Accepted Answer · 2017-05-23 11:53:20Z

0

You could try this POST for the question library. As for consuming the json string in javascript you can use jQuery

 jQuery.parseJSON( string );

edited May 23, 2017 at 11:53

CommunityBot

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answered Oct 30, 2012 at 8:28

Tibor Kiray

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1 Comment

Rachit Agrawal Over a year ago

the variable i want to use is a class variable of action class, It wouldnt be directly accesible in Javascript.

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