Ajax pass JSON array questions to Spring

var commditys = new Array();
    var a = $('.cartList').find('tr:gt(0)');
    var orderAmount = $('.prd-counter').find("input[name='orderAmount']").val();
    var discountAmount = $('.prd-counter').find("input[name='discountAmount']").val();
    var payAmount = $('.prd-counter').find("input[name='payAmount']").val();
    a.each(function () {
        var commdity = new Object();
        commdity.cmmdtyCode = $(this).find("input[name='cmmdtyCode']").val();
        commdity.cmmdtyName = $(this).find("input[name='cmmdtyName']").val();
        commdity.unitPrice = $(this).find("input[name='unitPrice']").val();
        commdity.sellPrice = $(this).find("input[name='sellPrice']").val();
        commdity.totalPayAmount = $(this).find("input[name='totalPayAmount']").val();
        commdity.quantity = $(this).find("input[name='quantity']").val();
        commditys.push(commdity);
    });
    $.ajax({
        method: 'post',
        url: '/saveCart.do',
        data: {
            'buyerPhone': buyerPhone,
            'orderAmount': orderAmount,
            'discountAmount': discountAmount,
            'payAmount': payAmount,
            'userCode': employeeCode,
            'commditys': JSON.stringify(commditys)
        },
        dataType: 'json',
        success: function (data) {
            if ("000000" == data.responseCode) {
                showTips("Success!");
                clearCart();
            } else {
                showTips("The form failed, please try again later!");
            }
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) {
            showTips("The form failed, please try again later!");
        }
    });

    // 6, pending order
    @RequestMapping(value = "saveCart", method = {RequestMethod.POST})
    @ResponseBody
    public String ajaxUpdateCart(@RequestParam String commditys,
                                 @RequestParam String buyerPhone,
                                 @RequestParam String orderAmount,
                                 @RequestParam String discountAmount,
                                 @RequestParam String payAmount,
                                 @RequestParam String userCode
    ) {

        String storeId = SessionUtils.getCurrentOperator().getStoreId();
//        String storeId = "A1004";
        JSONArray array = JSONArray.fromObject(commditys);
        List<CommdityBean> list = JSONArray.toList(array, new CommdityBean(), new JsonConfig());
        Response<String> response = shoppingCartService.createTempShopping(list, userCode, buyerPhone, storeId, orderAmount, discountAmount, payAmount);
        return JSONObject.toJSONString(response);
    }

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