Convert java object to jason tree or ExtJs tree string

[Himanshu Bhatnagar]

Hi,
i have a class called zone , which can have object list of zones themself . so basically a tree kind of object
how i can covert/map this java object to jason string representation of tree .
Is there some api that thake java object and ouput a jason tree string .

[naved momin]

Himanshu Bhatnagar wrote:Hi,
i have a class called zone , which can have object list of zones themself . so basically a tree kind of object
how i can covert/map this java object to jason string representation of tree .
Is there some api that thake java object and ouput a jason tree string .

please be clear what you are trying to achieve ?
do you want to serialize your object to json ?

[Himanshu Bhatnagar]

Actually i wanted the json version of my object , so that i can pass that to extjs store and can get a visual tree

[Rob Spoor]

Try a library like Jackson to convert your object to a JSON (not "jason") string.

[Himanshu Bhatnagar]

Actually i am using gson to convert the java objects to json format and i am getting below format :

{"name":"Papa","Zone1s":
	[{"name":"Beta1","Zone1s":
  	  	[  {"name":"BetaBeta1","Zone1s":[]},{"name":"BetaBeta2","Zone1s":[]}   ]},
	{"name":"Beta2","Zone1s":[]
  }]}

  

But i wanted this format for Ext js:

children: [
{ text: "Beta1", expanded: true , children: [
{ text: "BetaBeta1", leaf: true }, { text: "BetaBeta2", leaf: true }]}, { text: "Beta2", leaf: true }]}

That is the tag called "Children :" should come

[Ted Young]

I think you have two choices to get the JSON that you need to work with ExtJS:

Change your Java object model to better match what ExtJS expects

Write a custom Serializer (or the preferred TypeAdapter) to output the JSON that you need

I'd recommend #1 if you can do it, i.e., if you have control over the classes on the server-side. Otherwise the JSON that you need for ExtJS is different enough from your object model that you'll need to write a custom "type adapter" to change how Gson serializes your objects. See http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/TypeAdapter.html for the details.

;ted
--
Ted M. Young
Read my new book: The Jackson Cookbook: JSON Recipes in Java
http://about.me/tedmyoung