JSON Class and deserializeUntyped(jsonString)

 

{

  "event": {

    "recorddata": {

      "state": "Success",

      "recordItem": [

        {

          "id": "1",

          "name": "testRecord1"

        },

        {

          "id": "2",

          "name": "testRecord2"

        }

      ]

    }

  }

}

In webservice class,

@RestResource(urlMapping='/postrecorddata/*')

   global with sharing class postrecorddata {

       @HttpPost

      global static responseWrapper postrecorddatamethod(){

        RestRequest req = RestContext.request;

        RestResponse res = Restcontext.response;

        Map<String,Object> map = (Map<String,Object>) JSON.deserializeUntyped(req.requestBody.toString());

        Map<String,Object> map1= (Map<String,Object>) map.get('event');

        Map<String,Object> map2= (Map<String,Object>) map1.get('recorddata');

        String stateValue = (String) map2.get('state');

        List<Object> recordItemList= (List<Object> ) map2.get('recordItem');

        // Perform Some operations and return response

        responseWrapper obj=new responseWrapper();

        obj.message='Data Posted successfully';

        obj.statusCode = '200';

        // Overriding RestResponse object value

        res.statusCode = '200';

        return obj;

        global class responseWrapper{

        global string message;

        global integer statusCode;

        }

        

      }

   }