ajax傳遞json格式，spring MVC用對象接受

$("#saveBtn").click(function(){
	var pid = $('input[name="parentId"]').val();
	var pName = $('input[name="goodsTypeName"]').val();
	var sort = $('input[name="sort"]').val();
	var status = $('input[name="status"]:checked').val();
	var path = "${path}/admin/goods/saveGoodsType";
	$.ajax({
		type:"POST",
		url:path,
		dataType:"json",
		contentType: "application/json; charset=utf-8",
		beforeSend:function(xhr) {
		    xhr.setRequestHeader("If-Modified-Since","0");
	            xhr.setRequestHeader("Cache-Control","no-cache");
		},
                data:JSON.stringify({"parentId":pid,"typeName":pName,"sort":sort,"status":status}), //接送格式
                beforeSend:function(xhr) {
	            xhr.setRequestHeader("If-Modified-Since","0");
	            xhr.setRequestHeader("Cache-Control","no-cache");
		},
		success:function(result) {
			if(result.status == "success"){
				genGoodsTypes();
					
				/*div隱藏*/
				$('#myModal').modal('hide')
			}
		}
	});	
});

        /**
	 * 保存商品類型
	 * @param goodsType
	 * @return
	 * @throws Exception
	 */
	@RequestMapping(value="saveGoodsType",method=RequestMethod.POST)
	@ResponseBody
	public String saveGoodsType(@RequestBody GoodsType goodsType) throws Exception{
		Map<String,Object> maps = new HashMap<String, Object>();
		try {
			goodsTypeService.add(goodsType);
			maps = ajaxJsonMessage("success","添加商品類型成功！");
		} catch (Exception e) {
			logger.error("添加商品類型發生錯誤！");
			e.printStackTrace();
			maps = ajaxJsonMessage("fail","添加商品失敗！");
		}
		return JSONObject.toJSONString(maps);
	}