通过Jquery的Ajax方法读取将table转换为Json

2020-05-13 我要评论

1. 创建Users表

create table Users
(
UserId int identity(1,1) primary key,
UserName varchar(20)
)

insert into Users values('Bradley')
insert into Users values('Dan')

复制代码代码如下:

create table Users
(
UserId int identity(1,1) primary key,
UserName varchar(20)
)

insert into Users values('Bradley')
insert into Users values('Dan')

2. 创建JsonHelper类

复制代码代码如下:

public class JsonHelper
{
#region 序列化和反序列化
// 序列化
public static string JsonSerializer<T>(T t)
{
// 使用 DataContractJsonSerializer 将 T 对象序列化为内存流。
DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof (T));
MemoryStream ms = new MemoryStream();
// 使用 WriteObject 方法将 JSON 数据写入到流中。
jsonSerializer.WriteObject(ms, t);
// 流转字符串
string jsonString = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
//替换Json的Date字符串
string p = @"\\/Date$(\d+)\+\d+$\\/";
MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
Regex reg = new Regex(p);
jsonString = reg.Replace(jsonString, matchEvaluator);
return jsonString;
}
public static T JsonDeserialize<T>(string jsonString)
{
//将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式
string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
Regex reg = new Regex(p);
jsonString = reg.Replace(jsonString, matchEvaluator);
DataContractJsonSerializer jsonSerializer=new DataContractJsonSerializer(typeof(T));
// 字符串转流
MemoryStream ms=new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
// 通过使用 DataContractJsonSerializer 的 ReadObject 方法，将 JSON 编码数据反序列化为T
T obj = (T) jsonSerializer.ReadObject(ms);
return obj;
}
public static string ConvertJsonDateToDateString(Match match)
{
string result = string.Empty;
DateTime dateTime=new DateTime(1970,1,1);
dateTime = dateTime.AddMilliseconds(long.Parse(match.Groups[1].Value));
dateTime = dateTime.ToLocalTime();
result = dateTime.ToString("yyyy-MM-dd HH:mm:ss");
return result;
}
private static string ConvertDateStringToJsonDate(Match m)
{
string result = string.Empty;
DateTime dt = DateTime.Parse(m.Groups[0].Value);
dt = dt.ToUniversalTime();
TimeSpan ts = dt - DateTime.Parse("1970-01-01");
result = string.Format("\\/Date({0}+0800)\\/",ts.TotalMilliseconds);
return result;
}
#endregion

// 对象转换为Json
public static string ObjectToJson(object obj)
{
JavaScriptSerializer js=new JavaScriptSerializer();
try
{
return js.Serialize(obj);
}
catch (Exception exception)
{

throw new Exception(exception.Message);
}
}
// 数据表转化为集合
public static List<Dictionary<string,object>> DataTableToList(DataTable dt)
{
List<Dictionary<string ,object>> list=new List<Dictionary<string, object>>();
foreach (DataRow dataRow in dt.Rows)
{
Dictionary<string,object> dic=new Dictionary<string, object>();
foreach (DataColumn dc in dt.Columns)
{
dic.Add(dc.ColumnName,dataRow[dc.ColumnName]);
}
list.Add(dic);
}
return list;
}
// 表转换为Json
public static string DataTableToJson(DataTable dt)
{
return ObjectToJson(DataTableToList(dt));
}
}

复制代码代码如下:

3. 添加ashx代码文件

复制代码代码如下:

public class GetData : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
if (context.Request["action"]=="display")
{
context.Response.Write(JsonHelper.DataTableToJson(GetAllUsers()));
}
}

static SqlConnection conn = new SqlConnection("server=.;database=Test;uid=sa;pwd=123456");
public static DataTable GetAllUsers()
{
string sql = "select * from users";
SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
DataTable dt = new DataTable();
adapter.Fill(dt);
return dt;
}
public bool IsReusable
{
get
{
return false;
}
}
}

复制代码代码如下:

4. 前端调用

复制代码代码如下:

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script src="js/jquery-1.6.js" type="text/javascript"></script>
<script type="text/javascript">
$(function() {
var options = {
type: 'post',
url: "/GetData.ashx",
dataType: "json",
data: { action: "display" },
success: function(data) {
var html = "<table border='2px' style='text-align:center;border-style:solid;border-width:2px;border-color:#00ff00;'><tr><td>UserId</td><td>UserName</td></tr>";
$.each(data, function(i, result) {
html += "<tr><td>" + result["UserId"] + "</td><td>" + result["UserName"] + "</td></tr>";
})
html += "</table>";
$("#divData").html(html);
}
};
$.ajax(options);
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="divData">

</div>
</form>
</body>
</html>

复制代码代码如下:

5. 效果图

6. 同样可以通过getJSON方法读取数据

复制代码代码如下:

$.getJSON("/GetData.ashx",{ action: "display" },function(data) {
var html = "<table border='2px' style='text-align:center;border-style:solid;border-width:2px;border-color:#00ff00;'><tr><td>UserId</td><td>UserName</td></tr>";
$.each(data, function(i, result) {
html += "<tr><td>" + result["UserId"] + "</td><td>" + result["UserName"] + "</td></tr>";
})
html += "</table>";
$("#divData").html(html);
})

复制代码代码如下:

通过Jquery的Ajax方法读取将table转换为Json

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