asp.net mvc 服务器端返回JSON

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using System;

using System.Text;

using System.Web;

using System.Web.Mvc;

using System.Data.SqlClient;

using System.Drawing;

#region 生成文件json（也可直接输出JSON，生成文件便于减少服务器压力)

public void Provincefile()

{

int classid = 1; //报纸 6为杂志

if (Request.QueryString["bi"] != null && Request.QueryString["bi"].ToString() != "")

classid = int.Parse(Request.QueryString["bi"].ToString());

string wherestr = " parentid=0 ";

string sql = "select areaid,cnname,parentid,childclass from area where " + wherestr;

SqlDataReader dr = DB.DataReader(sql, null);

string areaid = "";

string cnname = "";

int total = 0;

int i = 0;

int j = 0;

string childclass = "";

StringBuilder hb = new StringBuilder();

hb.Append("{\"bk_province\": [ ");//返回bk_province表

while (dr.Read())

{

i++;

areaid = dr[0].ToString();

cnname = dr[1].ToString();

total = Mvc_areabll.Totalbk(Fun.Toint(areaid),classid);

childclass=dr[3].ToString();

if (i >1)

hb.Append(",");

hb.Append("{ \"areaid\": \"");

hb.Append(areaid);

hb.Append("\", \"cnname\": \"");

hb.Append(cnname);

hb.Append("\", \"total\": \"");

hb.Append(total);

hb.Append("\", \"childclass\": \"");

hb.Append(childclass);

hb.Append("\"");

//下面二级城市 bk_city:{....}

wherestr = " parentid=" +areaid;

sql = "select areaid,cnname,parentid,childclass from area where " + wherestr;

SqlDataReader dr2 = DB.DataReader(sql, null);

j = 0;

if (dr2.Read())

{

hb.Append(",\"bk_city\": [ ");//二级bk_city表记录

do

{

areaid = dr2[0].ToString();

cnname = dr2[1].ToString();

total = Mvc_areabll.Totalbk(Fun.Toint(areaid), classid);

childclass = dr2[3].ToString();

if (total > 0)

{

j++;

if (j>1)

hb.Append(",");

hb.Append("{ \"cityid\": \"");

hb.Append(areaid);

hb.Append("\", \"cityname\": \"");

hb.Append(cnname);

hb.Append("\", \"citytotal\": \"");

hb.Append(total);

hb.Append("\", \"citychildclass\": \"");

hb.Append(childclass);

hb.Append("\" }");

}

}

while (dr2.Read());

hb.Append(" ]"); //二级bk_city表记录

}

dr2.Close();

dr2.Dispose();

//二级城市 bk_city finish

hb.Append(" }");

}

dr.Close();

dr.Dispose();

hb.Append(" ] }"); //返回表名

string filestr = hb.ToString();

//生成json文件

string filename = "";

if (classid == 1)

filename = "bk_province.json";

else

filename = "mag_province.json";

string filename1 = Server.MapPath(Fun.Webdirectory + Fun.Savedata() + "/json/" + filename);

// Response.Write(filestr);

Mvccom.Funs.SaveFile(filestr, filename1);

Response.Write("ok");

hb = null;

return;

}

#endregion

using System;

using System.Globalization;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.IO;

#region 保存为文件方法

public static void SaveFile(string filecon, string fileName)

{

FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);

byte[] byteData = Encoding.UTF8.GetBytes(filecon);

fs.Write(byteData, 0, byteData.Length);

fs.Close();

fs.Dispose();

}

#endregion

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