How to return Json data from servlet in cq5

                By passing some data to the servlet(We can use Ajax call to pass the data -- Refer here for Ajax call ), we can generate a json as per our requirement and return to the front end page / Dialog.


package com.demo.train;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.rmi.ServerException;

import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.jcr.api.SlingRepository;
import org.json.simple.JSONObject;
import java.util.UUID;

@SlingServlet(paths="/bin/convertPropsAsJson", methods = "POST", metatype=true)
public class HandleClaim extends org.apache.sling.api.servlets.SlingAllMethodsServlet {
     private static final long serialVersionUID = 23426532342349515L;
   
     @Reference
     private SlingRepository repository;
   
     public void bindRepository(SlingRepository repository) {
            this.repository = repository;
            }
         
     @Override
     protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServerException, IOException {
     
      try
      {
         //Get the submitted form data that is sent from the
              //CQ web page
          String id = UUID.randomUUID().toString();
          String value1 = request.getParameter("value1");
          String value2 = request.getParameter("value2");
          String value3 = request.getParameter("value3");
     
          //Encode the submitted form data to JSON
          JSONObject obj=new JSONObject();
          obj.put("id",id);
          obj.put("value1",value1);
          obj.put("value2",value2);
          obj.put("value3",value3);
         
             //Get the JSON formatted data  
          String jsonData = obj.toJSONString();
         
             //Return the JSON formatted data
         response.getWriter().write(jsonData);
      }
      catch(Exception e)
      {
          e.printStackTrace();
      }
    }
}

Now can split and use our jsonData as per our requirement.

Thanks.

Hope it helps :)