springMVC, foreground ajax pass JSON array parameters, how to receive background

 Front section:
var data=[
{ "firstName":"John" , "lastName":"Doe" },{ "firstName":"Anna" , "lastName":"Smith" },
{ "firstName":"Peter" , "lastName":"Jones" }
]

$.ajax({
    url: './saveSelectedData',
    method: 'post',
    data: { 'selectedData': JSON.stringify (data)}, // string passed as a common reference
    dataType:"json",
    error: function(data){
                 alert ( "failed");
    },
    success: function(data){
                 alert ( "success");
    }
})

Background sections:

// json package used: com.alibaba.fastjson

@RequestMapping("/saveSelectedData")
@ResponseBody
 public void saveSelectedData (String selectedData) {// Common string receiving
         JSONArray jsonArray = JSONArray.parseArray (selectedData); // turn into arrays json
         for (int i = 0; i <jsonArray.size (); i ++) // traverse the array json
    {
        JSONObject jsonObject = jsonArray.getJSONObject(i);
                   System.out.println (jsonObject.get ( "firstName")) // based on key values

}
}

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