Json own request the ajax

function singlePriceSubmit(){
    var json={};
    json["area"]=areaStr1;
    json["goodCateIdStr"]=goodCateIdStr;
    var arr=[];
    $("#singlePriceId table tbody tr").each(function(){
        var cells=this.cells;
        var json1={};
        json1["goodsId"]=cells[0].childNodes[0].id;
        json1["price"]=$.trim(cells[1].childNodes[0].value);
        json1["maxPayIntegrateRate"]=$.trim(cells[2].childNodes[0].value);
        json1["receivableIntegrateRate"]=$.trim(cells[3].childNodes[0].value);
        arr.push(json1);
    });
    if(!checkData(arr)){
        return;
    }
    json["arr"]=arr;
    CommonUtil.showOverlay();
    var ajax = new $ax(Feng.ctxPath + "/goodPrice/singlesetprice", function (data) {
        CommonUtil.hideOverlay();
        Feng.info("操作成功!");
        $("#singlePriceId").modal("hide");
    }, function (data) {
        CommonUtil.hideOverlay();
        Feng.error("操作失败!" + data.responseJSON.message + "!");
    });
    ajax.set("json",JSON.stringify(json));
    ajax.start();

}

java

@RequestMapping(value = "/singlesetprice")
    @ResponseBody
    public Object singleSetPrice(@RequestParam(value="json",required=true) String json) {
        this.iGoodsPriceService.singleSetPrice(json);
        return SUCCESS_TIP;
    }