public void addSupply(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            Supply supply = new Supply();

            supply.SupplyName        = context.Request["Name"];
            supply.SupplyDesc        = context.Request["Desc"];
            supply.SupplyCategory.Id = Convert.ToInt32(context.Request["CategoryId"]);
            supply.User.Id           = Convert.ToInt32(context.Session["userId"]);
            //supply.User.Id = 1;//暂时
            Dictionary <String, Object> dictionary = new Dictionary <string, object>();
            int id = supplyService.addSupply(supply);

            if (id > 0)
            {
                dictionary.Add("Id", id);
                dictionary.Add("success", "true");
            }
            else
            {
                dictionary.Add("success", "false");
            }
            context.Response.Write(JsonUtil.toJson(dictionary).ToString());
        }