Json作為一種輕量級的數(shù)據(jù)交換格式,由于其傳輸數(shù)據(jù)格式的方便性，今天偶然想將其應用于分頁實現(xiàn)，分頁做為web開發(fā)一個長久的話題，其應用的高效與重要性就不多說了
本文主要技術:反射機制，Json數(shù)據(jù)格式，jquery
為了應用的通用性，首先要根據(jù)反射機制，能將要返回的任意類型的結果對象轉化成Json類型的格式。

public static String toJSON(Object obj) {
HashMap map = new HashMap();
Class c = obj.getClass();
// 利用反射機 制，把里面所有的屬性，反射出來使用，這樣放入任何一個對象， 都可以找到他們的屬性，
// 把這些屬性的名，和屬性的值，封裝成一個map里，
Field[] fields = c.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
String name = fields[i].getName();
try {
fields[i].setAccessible(true);
Object o = fields[i].get(obj);
i f (o instanceof Number) {
map.put(""" + name + """, o.toString());
} else if (o instanceof String) {
map.put(""" + name + """, """ + o.toString() + """);
}
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
}
}
/ / 把map對象變成字符串
// 這些格式還需要把=變成:
String s = map.toString();
/ /System.out.println(s);
String str = s.replaceAll(""=", "":");
//System.out.println(str);
return str;
}

將要返回的多個對象轉換成Json類型的對象后，最后應加上分頁的信息，最終將多個Json字符串，轉化成一整個Json類型

{"0":{"id":"0", "name":"dong0", "age":21},
"1":{"id":"1", "name":"dong1", "age":21},
"2":{"id":"2", "name":"dong2", "age":21},
"3":{"id":"3", "name":"dong3", "age":21},
"4":{"id":"4", "name":"dong4", "age":21},
"5":{"id":"5", "name":"dong5", "age":21},
"6":{"id":"6", "name":"dong6", "age":21},
"7":{"id":"7", "name":"dong7", "age":21},
"8":{"id":"8", "name":"dong8", "age":21},
"9":{"id":"9", "name":"dong9", "age":21},
"10":{"firstPage":1, "currentPage":1, 
"default_Record_Num":10, "lastPage":10, "frontPage":1, "sum":100, "nextPage":2},
"length":11}

當信息發(fā)送到客戶端時，只用jquery接收對象的數(shù)據(jù)就行了，這樣可以實現(xiàn)前臺的樣式與后臺傳送的數(shù)據(jù)分離，更加簡化了代碼

$.getJSON("result.jsp?page="+p, function(json)
{
$("#show").html("<tr><th>用戶ID</th><th>用戶名</th><th>用戶年齡</th></tr>");
for(var i=0 ; i<json.length-1; i++){
$("#show").append("<tr><td>"+json[i]["id"]+"</td><td>"+json[i]["name"]+"</ td><td>"
+json[i]["age"]+"</td></tr>");
}
$("#currentPage").attr("value",json[json.length-1]["currentPage"]);
$("#pageCount").attr("value",json[json.length-1]["lastPage"]);
});

利用JQuery與JSon實現(xiàn)的無刷新分頁代碼，具體代碼如下

需要四個文件
一個實體類文件 CategoryInfoModel.cs
一個SqlHelper SQLHelper.cs
一個AJAX服務端處理程序 PagedService.ashx
一個客戶端調(diào)用頁面 WSXFY.htm
CategoryInfoModel.cs和SQLHelper.cs我就不寫了，都知道是什么文件
PagedService.ashx 代碼如下

using System.Web.Script.Serialization; 
public void ProcessRequest(HttpContext context) 
{ 
context.Response.ContentType = "text/plain"; 
string strAction = context.Request["Action"]; 
//取頁數(shù) 
if (strAction == "GetPageCount") 
{ 
string strSQL = "SELECT COUNT(*) FROM CategoryInfo"; 
int intRecordCount = SqlHelper.ExecuteScalar(strSQL); 
int intPageCount = intRecordCount / 10; 
if (intRecordCount % 10 != 0) 
{ 
intPageCount++; 
} 
context.Response.Write(intPageCount); 
}//取每頁數(shù)據(jù) 
else if (strAction == "GetPageData") 
{ 
string strPageNum = context.Request["PageNum"]; 
int intPageNum = Convert.ToInt32(strPageNum); 
int intStartRowIndex = (intPageNum - 1) * 10 + 1; 
int intEndRowIndex = (intPageNum) * 10 + 1; 
string strSQL = "SELECT * FROM ( SELECT ID,CategoryName,Row_Number() OVER(ORDER BY ID ASC) AS rownum FROM CategoryInfo) AS t"; 
strSQL += " WHERE t.rownum >= " + intStartRowIndex + " AND t.rownum <= " + intEndRowIndex; 
DataSet ds = new DataSet(); 
SqlConnection conn = SqlHelper.GetConnection(); 
ds = SqlHelper.ExecuteDataset(conn, CommandType.Text, strSQL); 
List<CategoryInfoModel> categoryinfo_list = new List<CategoryInfoModel>();//定義實體集合 
for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
{ 
CategoryInfoModel categoryinfo = new CategoryInfoModel(); 
categoryinfo.CategoryInfoID = Convert.ToInt32(ds.Tables[0].Rows[i]["ID"]); 
categoryinfo.CategoryName = ds.Tables[0].Rows[i]["CategoryName"].ToString(); 
categoryinfo_list.Add(categoryinfo); 
} 
JavaScriptSerializer jss = new JavaScriptSerializer(); 
context.Response.Write(jss.Serialize(categoryinfo_list));//序列化實體集合為javascript對象 
} 
}

WSXFY.htm 代碼如下

<head> 
<title>無刷新分頁</title> 
<script type="text/javascript" src="../Scripts/jquery-1.5.1.min.js"></script> 
<script type="text/javascript"> 
$(function () { 
$.post("PagedService.ashx", { "Action": "GetPageCount" }, function (response, status) { 
for (var i = 1; i <= response; i++) { 
var td = $("<td><a href=''>" + i + "</a></td>"); 
$("#trPage").append(td); 
td.click(function (e) { 
e.preventDefault(); //不要導向鏈接 
$.post("PagedService.ashx", { "Action": "GetPageData", "PageNum":$(this).text() }, function (response, status) { 
var categorys = $.parseJSON(response); 
$("#ulCategory").empty(); 
for (var i = 0; i < categorys.length; i++) { 
var category = categorys[i]; 
var li = $("<li>" + category.CategoryInfoID + "-" + category.CategoryName + "</li>"); 
$("#ulCategory").append(li); 
} 
}); 
}); 
} 
}); 
}); 
</script> 
</head> 
<body> 
<ul id="ulCategory"></ul> 
<table> 
<tr id="trPage"> 
</tr> 
</table> 
</body> 
</html>

以上就是本文的全部內(nèi)容，希望能夠幫助大家實現(xiàn)分頁效果。

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