手机开发json数据传参

     最近做手机开发，后台vs2010,access=>json<=前端Android,ios

     网上的例子真的很少，苦逼了一周，本地浏览器是可以看到结果，但是Android和ios的屌丝们都耐不住了，MB的，解析不了啊，这是个肿么情况。哎~~~

     天天傻瓜式的上网查资料，打开百度，输入"net如何将json以包的形式传递给前端。",java的倒是有几个，.net的例子一个都没有，真想ctmd。本来想找外部资源问问，倒是给了个例子，md什么都冒得，就一个Newtonsoft.dll,感觉自己被鄙视了。冷静后，发誓一定将json传参搞定....

    废话不多说，直接上代码。

    新添加一个ashx的页面取名为“GetJson”

     json类

public class GetJson : IHttpHandler
{
        public void ProcessRequest(HttpContext context)
        {
            context.Response.Cache.SetNoStore();
            context.Response.Clear();
            context.Response.ContentType = "application/json";
            context.Response.Charset = "utf-8";
            string action = context.Request["action"].ToString();
            string param = context.Request["params"].ToString().Replace(@"""", "").Replace("{", "").Replace("}", "");
            context.Response.Write(Write(action, param));
        }

        public string ReturnJson()
        {
            DataTable dt = new BLL.category().GetList("");
            //return ToJson(dt);
            return CreateJsonParameters(dt);
        }

        /// <summary>
        /// 将一个数据表转换成一个JSON字符串，在客户端可以直接转换成二维数组。
        /// </summary>
        /// <param name="source">需要转换的表。</param>
        /// <returns></returns>
        public static string DataTableToJson(DataTable source)
        {
            if (source.Rows.Count == 0)
                return "";
            StringBuilder sb = new StringBuilder("[");
            foreach (DataRow row in source.Rows)
            {
                sb.Append("[");
                for (int i = 0; i < source.Columns.Count; i++)
                {
                    sb.Append('"' + row[i].ToString() + "\",");
                }
                sb.Remove(sb.Length - 1, 1);
                sb.Append("],");
            }
            sb.Remove(sb.Length - 1, 1);
            sb.Append("]");
            return sb.ToString();
        }


        /// <summary>
        /// 反回JSON数据到前台
        /// </summary>
        /// <param name="dt">数据表</param>
        /// <returns>JSON字符串</returns>
        public string CreateJsonParameters(DataTable dt)
        {
            StringBuilder JsonString = new StringBuilder();
            //Exception Handling        
            if (dt != null && dt.Rows.Count > 0)
            {
                JsonString.Append("{");
                JsonString.Append("\"TableInfo\":[ ");
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    JsonString.Append("{ ");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j < dt.Columns.Count - 1)
                        {
                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");
                        }
                        else if (j == dt.Columns.Count - 1)
                        {
                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");
                        }
                    }
                    /**/
                    /*end Of String*/
                    if (i == dt.Rows.Count - 1)
                    {
                        JsonString.Append("} ");
                    }
                    else
                    {
                        JsonString.Append("}, ");
                    }
                }
                JsonString.Append("]}");
                return JsonString.ToString();
            }
            else
            {
                return null;
            }
        }

        public static string ToJsons(DataTable dt)
        {
            Dictionary<string, object> dic = new Dictionary<string, object>();

            int index = 0;
            foreach (DataRow dr in dt.Rows)
            {
                Dictionary<string, object> result = new Dictionary<string, object>();

                foreach (DataColumn dc in dt.Columns)
                {
                    result.Add(dc.ColumnName, dr[dc].ToString());
                }
                dic.Add(index.ToString(), result);
                index++;
            }
            return ToJson(dic);
        }

        public static string ToJson(object obj)
        {
            //// 首先，当然是JSON序列化
            //DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());

            //// 定义一个stream用来存发序列化之后的内容
            //Stream stream = new MemoryStream();
            //serializer.WriteObject(stream, obj);

            //// 从头到尾将stream读取成一个字符串形式的数据，并且返回
            //stream.Position = 0;
            //StreamReader streamReader = new StreamReader(stream);
            //return streamReader.ReadToEnd();

            DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
            using (MemoryStream ms = new MemoryStream())
            {
                serializer.WriteObject(ms, obj);
                StringBuilder sb = new StringBuilder();
                sb.Append(Encoding.UTF8.GetString(ms.ToArray()));
                return sb.ToString();
            }
        }

        //http://localhost:27784/admin/GetJson.aspx?uuid=3C075461B9B0&platformCode=IPHONE&platformVersion=5.1&appVersion=1.0&action=200&sign=464532A3157ED106931C569442F1A0B7&params={channel_id:1,parent_id:0} 
        //获取栏目
        public string GetLanMu(string action, string param)
        {
            BLL.category bllCagetory = new BLL.category();
            string str = string.Empty;
            string[] s = param.Split(',');
            switch (action)
            {
                case "200"://栏目
                    string channel_id = s[0].Split(':')[1];
                    string parent_id = s[1].Split(':')[1];
                    DataTable dt = bllCagetory.GetList(" channel_id=" + channel_id + " and parent_id=" + parent_id);
                    string[] strColumnName = { "id", "title", "img_url" };
                    str = GetjsonByDT(dt, strColumnName, parent_id, action);
                    break;
                case "201"://运动项目
                    string parent_id1 = s[0].Split(':')[1];
                    DataTable dt1 = bllCagetory.GetList(" parent_id=" + parent_id1);
                    string[] strColumnName1 = { "id", "title", "img_url" };
                    str = GetjsonByDT(dt1, strColumnName1, parent_id1, action);
                    break;
                case "202"://动作分解
                    string parent_id2 = s[0].Split(':')[1];
                    DataTable dt2 = bllCagetory.GetList(" parent_id=" + parent_id2);
                    string[] strColumnName2 = { "id", "title", "img_url" };
                    str = GetjsonByDT(dt2, strColumnName2, parent_id2, action);
                    break;
                default:
                    break;
            }

            return str;
        }

        public string GetActionName(string action)
        {
            string s = string.Empty;
            switch (action)
            {
                case "200":
                    s = "menu"; break;
                case "201":
                    s = "menu_sport"; break;
                case "202":
                    s = "action"; break;
                case "203":
                    s = "action_info"; break;
                default:
                    break;
            }
            return s;
        }

        public string GetjsonByDT(DataTable dt, string[] strcolumnName, string id, string action)
        {
            StringBuilder JsonString = new StringBuilder();
            //Exception Handling        
            if (dt != null && dt.Rows.Count > 0)
            {
                JsonString.Append("{");
                JsonString.Append("\"parent_id\":" + id + ",");

                string title = "";
                if (new BLL.category().GetModel(int.Parse(id)) != null)
                {
                    title = "\"" + new BLL.category().GetModel(int.Parse(id)).title + "\"";
                }
                else
                {
                    title = "\"\"";
                }

                JsonString.Append("\"title\":" + title + "" + ",");
                JsonString.Append("\"" + GetActionName(action) + "\":[");
                if (dt.Rows.Count > 0)
                {
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        string categoroyid = dt.Rows[i]["id"].ToString();
                        DataTable dtphoto = new BLL.photo().GetList(100, " category_id=" + categoroyid, " id asc").Tables[0];

                        JsonString.Append("{");
                        string str = string.Empty;
                        foreach (string s in strcolumnName)
                        {
                            if (s == "img_url")
                            {
                                if (dtphoto.Rows.Count > 0)
                                {
                                    str += "\"action_info\":[";
                                    foreach (DataRow dr in dtphoto.Rows)
                                    {
                                        string simage = string.Empty;
                                        DataTable dtphoto_album = new BLL.photo_album().GetList(" photo_id=" + dr["id"].ToString()).Tables[0];
                                        if (dtphoto_album.Rows.Count > 0)
                                        {
                                            foreach (DataRow dr1 in dtphoto_album.Rows)
                                            {
                                                simage += "{\"";
                                                simage += s + "\":" + "\"http://liuhuawenmile.vicp.cc" + dr1["small_img"] + "\"";
                                                simage += "},";
                                            }
                                            simage = simage.Substring(0, simage.Length - 1);
                                        }

                                        if (simage.Length == 0)
                                        {
                                            simage = "{\"image_url\":\"-1\"}";
                                        }

                                        str += "{\"id\":" + "\"" + dr["id"].ToString() + "\",";
                                        str += "\"title\":" + "\"" + dr["title"].ToString() + "\",";
                                        str += "\"image\":[" + simage + "]},";
                                    }
                                    str = str.Substring(0, str.Length - 1);
                                    str += "] ";
                                }
                            }
                            else
                            {
                                str += "\"" + s + "\":" + "\"" + dt.Rows[i][s].ToString() + "\",";
                            }
                        }

                        JsonString.Append(str.Substring(0, str.Length - 1));
                        /**/
                        /*end Of String*/
                        if (i == dt.Rows.Count - 1)
                        {
                            JsonString.Append("}");
                        }
                        else
                        {
                            JsonString.Append("},");
                        }
                    }

                    JsonString.Append("]}");
                }
            }
            return JsonString.ToString();
        }

        public string Write(string action, string param)
        {
            try
            {
                return "{\"Code\":\"1\"," + "\"Message\":\"" + "成功" +"\",\"Result\":" + ToJson(GetLanMu(action, param)) + ",\"OperationTime\":" + "\"" + DateTime.Now.ToString() + "\"}";
            }
            catch (Exception ex)
            {
               return "{\"Code\":\"-1\"," + "\"Message\":\"" + ex.ToString() + "\"," + "\"Result\":\"null\",\"OperationTime\":" + "\"" + DateTime.Now.ToString() + "\"}";
            }
        }
    }