JQuery post JSON object to a server

I create a json that needs to be posted in jersey, a server running by grizzly that has a REST webservice gets incoming json object which need to be outputed. I'm giving a try but not sure how to implement this correctly.

import java.io.IOException;
import java.io.InputStream;

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.commons.io.IOUtils;

import javax.ws.rs.*;

    @Path("/helloworld")
    public class GetData {
        @GET
        @Consumes("application/json")
        public String getResource() {

            JSONObject obj = new JSONObject();
            String result = obj.getString("name");

            return result;      
        }                   

    } 

i have a html file that runs this method while onload

    function sendData() {
        $.ajax({
                url: '/helloworld',
                type: 'POST',
                contentType: 'application/json',
                data: {
                    name:"Bob",


                },
                dataType: 'json'
            });
            alert("json posted!");
        };

To send json to the server, you first have to create json

function sendData() {
    $.ajax({
        url: '/helloworld',
        type: 'POST',
        contentType: 'application/json',
        data: JSON.stringify({
            name:"Bob",
            ...
        }),
        dataType: 'json'
    });
}

This is how you would structure the ajax request to send the json as a post var.

function sendData() {
    $.ajax({
        url: '/helloworld',
        type: 'POST',
        data: { json: JSON.stringify({
            name:"Bob",
            ...
        })},
        dataType: 'json'
    });
}

The json will now be in the json post var.

It is also possible to use FormData(). But you need to set contentType as false:

var data = new FormData();
data.append('name', 'Bob'); 

function sendData() {
    $.ajax({
        url: '/helloworld',
        type: 'POST',
        contentType: false,
        data: data,
        dataType: 'json'
    });
}