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生成json格式

2024-07-18 23:37:35   229人阅读

html页面

 <input type="button" value="重新生成JSON" class="button1" id="createjson" />

 javascript部分

 <script type="text/javascript"> $(function () {             //生成JSON            $("#createjson").click(function () {                $.post("NewsCategory.aspx?action=create", function (json) {                    alert(json.msg);                 });            });     });</script>

后台代码

　　protected void Page_Load(object sender, EventArgs e)    {        if (Request.Headers["X-Requested-With"] != null && Request.Headers["X-Requested-With"].ToLower() == "XMLHttpRequest".ToLower())        {            Response.Clear();            Response.ContentType = "application/json";            if (Request["action"] == "create")            {                Response.Write(CreateJson());            }            Response.End();        }    }
View Code

 

 　　/// <summary>    /// 生成商家类别Json    /// </summary>    /// <returns></returns>    protected string CreateJson()    {                System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();　　　　　//初始化（引用空间using System.Text;）
        StringBuilder sb = new StringBuilder();        var list = Express.BLL.NewsCategory.Get();        foreach (var item in list)        {            if (sb.Length > 0)                sb.Append(",");            sb.Append(string.Format("{{\"id\":{0},\"name\":\"{1}\",\"pid\":{2},\"itemvalue\":\"{3}\"", item.Id, GetUnicode(item.ItemName), item.ParentId, item.ItemValue));            sb.Append("}");        }　　　　　//返回与Web服务器上的指定虚拟路径相对应的物理文件路径
        string filePath = Server.MapPath(@"/common/newscategoryJson.js"); 　　　　//创建一个新文件，并写入指定字符串，若目标文件已存在，则覆盖该文件
        System.IO.File.WriteAllText(filePath, "[" + sb.ToString() + "]", System.Text.Encoding.UTF8);               return json.Serialize(new { code = 1, msg = "生成完成" });    }

 汉字转为Unicode编码

 /// <summary>    /// 得到汉字的Unicode编码    /// </summary>    protected string GetUnicode(string text)    {        string result = "";        for (int i = 0; i < text.Length; i++)        {            if ((int)text[i] > 32 && (int)text[i] < 127)            {                result += text[i].ToString();            }            else                result += string.Format("\\u{0:x4}", (int)text[i]);        }        return result;    }
View Code

数据库部分

        /// 获取全部        /// </summary>        public List<Model.NewsCategory> Get()        {            string sql = "select * from NewsCategory  order by case when ParentId=0 then Id*10000 else ParentId*10000+Id end";            List<Model.NewsCategory> list = new List<Model.NewsCategory>();            using (SqlDataReader dr = DBUtility.SqlHelper.ExecuteReader(ConnString.connReadonly, CommandType.Text, sql, null))            {                while (dr.Read())                {                    Model.NewsCategory model = new Model.NewsCategory();                    object obj;                    obj = dr["Id"];                    if (obj != null && obj != DBNull.Value)                    {                        model.Id = (int)obj;                    }                    obj = dr["SortValue"];                    if (obj != null && obj != DBNull.Value)                    {                        model.SortValue = (int)obj;                    }                    obj = dr["ParentId"];                    if (obj != null && obj != DBNull.Value)                    {                        model.ParentId = (int)obj;                    }                    model.ItemName = dr["ItemName"].ToString();                    model.ItemValue=dr["ItemValue"].ToString();                    list.Add(model);                }            }            return list;        }
View Code

运行结果
common/newscategoryJson.js

[{"id":31,"name":"\u65b0\u95fb\u4e2d\u5fc3","pid":0,"itemvalue":"|0|"},
{"id":51,"name":"\u4f01\u4e1a\u5feb\u8baf","pid":31,"itemvalue":"|0|31|"},
{"id":52,"name":"\u4f01\u4e1a\u516c\u544a","pid":31,"itemvalue":"|0|31|"},
{"id":53,"name":"\u884c\u4e1a\u52a8\u6001","pid":31,"itemvalue":"|0|31|"},
{"id":91,"name":"\u65b0\u95fb\u4e2d\u5fc3","pid":31,"itemvalue":"|0|31|"},
{"id":93,"name":"\u4f01\u4e1a\u5feb\u8baf","pid":31,"itemvalue":"|0|31|"},
{"id":94,"name":"\u4f01\u4e1a\u516c\u544a","pid":31,"itemvalue":"|0|31|"},
{"id":180,"name":"\u6d4b\u8bd5","pid":31,"itemvalue":"|0|31|"},
{"id":181,"name":"\u6d4b\u8bd5111","pid":31,"itemvalue":"|0|31|"},


{"id":54,"name":"\u5173\u4e8e\u76df\u53cb\u634c\u634c","pid":0,"itemvalue":"|0|"},
{"id":55,"name":"\u4f01\u4e1a\u6982\u51b5","pid":54,"itemvalue":"|0|54|"},
{"id":56,"name":"\u4f01\u4e1a\u6587\u5316","pid":54,"itemvalue":"|0|54|"},
{"id":57,"name":"\u4f01\u4e1a\u53d1\u5c55","pid":54,"itemvalue":"|0|54|"}
......
]

 涉及的知识点

1、Server.MapPath(string path);

2、System.IO.File.WriteAllText(sting path,string contents,Encoding encoding);

生成json格式


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