OK，上次完成了客戶端的分頁，這次我們就在上一次的Demo上進行修改，來實現服務端的分頁~
js代碼：
<script type="text/javascript">$(document).ready(function() { $('#table_id_example').DataTable({ "bProcessing" : false, //是否顯示加載 "sAjaxSource" : '/datatableDemo/user/json', //請求資源路徑 "serverSide": true, //開啟服務器處理模式 /* 使用ajax，在服務端處理數據 sSource:即是"sAjaxSource" aoData:要傳遞到服務端的參數 fnCallback:處理返回數據的回調函數 */ "fnServerData": function(sSource, aoData, fnCallback){ $.ajax( { 'type' : 'post', "url": sSource, "dataType": "json", "data": { "aodata" : JSON.stringify(aoData) }, "success": function(resp) { fnCallback(resp); } }); }, "columns" : [ { data : "id" }, { data : "name" }, { data : "age" }, ] });})</script>開啟服務器處理模式，這時我們對表格的每次操作，datatable都會幫我們向服務器發起請求獲取數據，默認是用GET方式傳遞參數，所以我們下面加上了”fnServerData”，這樣可以修改參數傳遞的方式為POST，那么到底給服務端發送的”aoData”是個什么鬼呢，別急，我們直接從Servlet取出來看看就知道了
此時我們的Servlet也要做一點修改：
public class Action extends HttpServlet { /** * */ private static final long serialVersionUID = 5957315496919679612L; @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 編碼設置 request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); response.setCharacterEncoding("UTF-8"); // 把傳送過來的JSON字符串轉成JSON數組 JSONArray ja = JSONArray.fromObject(request.getParameter("aodata")); System.out.println(ja); // 從數據庫獲取數據 List<User> listUser = Service.getInstance().getAll(); // 數據封裝并返回給客戶端 DataTableJSONResponse dtjs = new DataTableJSONResponse(listUser); JSONObject jsonObject = JSONObject.fromObject(dtjs); response.getWriter().print(jsonObject.toString()); }此時我們運行一下，OK，發現所謂的參數長這個模樣
[{“name”:”sEcho”,”value”:1}, {“name”:”iColumns”,”value”:3}, {“name”:”sColumns”,”value”:”,,”}, {“name”:”iDisplayStart”,”value”:0}, {“name”:”iDisplayLength”,”value”:10}, {“name”:”mDataProp_0”,”value”:”id”}, {“name”:”sSearch_0”,”value”:”“}, {“name”:”bRegex_0”,”value”:false}, {“name”:”bSearchable_0”,”value”:true}, {“name”:”bSortable_0”,”value”:true}, {“name”:”mDataProp_1”,”value”:”name”}, {“name”:”sSearch_1”,”value”:”“}, {“name”:”bRegex_1”,”value”:false}, {“name”:”bSearchable_1”,”value”:true}, {“name”:”bSortable_1”,”value”:true}, {“name”:”mDataProp_2”,”value”:”age”}, {“name”:”sSearch_2”,”value”:”“}, {“name”:”bRegex_2”,”value”:false}, {“name”:”bSearchable_2”,”value”:true}, {“name”:”bSortable_2”,”value”:true}, {“name”:”sSearch”,”value”:”“}, {“name”:”bRegex”,”value”:false}, {“name”:”iSortCol_0”,”value”:0}, {“name”:”sSortDir_0”,”value”:”asc”}, {“name”:”iSortingCols”,”value”:1}] 是不是感覺有點晦澀難懂，于是本菜上網查了下，勉強是看懂這個鬼東西，接下來就講解一下幾個我們需要的參數：
sEcho：客戶端發送請求同時發送過來的一個標識，雖然有什么卵用不知道，不過我們服務端返回的數據中必須帶有這個標識，哦，官網的文檔里說，服務端取出標識最好轉一下轉成int，防止XXS攻擊（懵逼，暫且不管，我們只知道需要這個就行）
iColumns：列數
iDisplayStart：起始索引
iDisplayLength：顯示的行數
{“name”:”mDataProp_0”,”value”:”id”},
{“name”:”sSearch_0”,”value”:”“},
{“name”:”bRegex_0”,”value”:false},
{“name”:”bSearchable_0”,”value”:true},
{“name”:”bSortable_0”,”value”:true}
每一列的參數設置，_0即是第一列，這個我們不管，到下面也是提取列名而已
sSearch：全局搜索字段
iSortCol_0：被排序的列
sSortDir_0：排序方式
完成了參數解讀，那么接下來就要提取我們的參數啦~~開工加代碼
public class Action extends HttpServlet { /** * */ private static final long serialVersionUID = 5957315496919679612L; @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 編碼設置 request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); response.setCharacterEncoding("UTF-8"); // 把傳送過來的JSON字符串轉成JSON數組 JSONArray ja = JSONArray.fromObject(request.getParameter("aodata")); System.out.println(ja); // 獲取需要的參數值 String sEcho = null; Integer iColumns = null; Integer iDisplayStart = null; Integer iDisplayLength = null; List<String> mDataProp = new ArrayList<String>(); //存放列名 String sSearch = null; Integer iSortCol_0 = null; String iSortCol = null; String sSortDir_0 = null; for (int i = 0; i < ja.size(); i++) { if (ja.getJSONObject(i).getString("name").equals("sEcho")) sEcho = ja.getJSONObject(i).getString("value"); else if (ja.getJSONObject(i).getString("name").equals("iColumns")) iColumns = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("iDisplayStart")) iDisplayStart = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("iDisplayLength")) iDisplayLength = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("sSearch")) sSearch = ja.getJSONObject(i).getString("value"); else if (ja.getJSONObject(i).getString("name").equals("iSortCol_0")) iSortCol_0 = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("sSortDir_0")) sSortDir_0 = ja.getJSONObject(i).getString("value"); else if (iColumns != null) { for (int j = 0; j < iColumns; j++) if (ja.getJSONObject(i).getString("name").equals("mDataProp_" + j)) mDataProp.add(ja.getJSONObject(i).getString("value")); } } iSortCol = mDataProp.get(iSortCol_0); System.out.println(sEcho); System.out.println(iColumns); System.out.println(iDisplayStart); System.out.println(iDisplayLength); System.out.println(sSearch); System.out.println(iSortCol); System.out.println(sSortDir_0); // 從數據庫獲取數據 List<User> listUser = Service.getInstance().getAll(); // 數據封裝并返回給客戶端 DataTableJSONResponse dtjs = new DataTableJSONResponse(listUser); JSONObject jsonObject = JSONObject.fromObject(dtjs); response.getWriter().print(jsonObject.toString()); }好的，加工完畢，這時我們跑一跑看看是不是打出我們要的參數，這里我就不貼出來了，你們自己跑了看，好的發現拿到了我們要的參數，那么接下來可以拼接我們的sql語句了，同時我們要對我們的DataTableJSONResponse進行一下小小的修改，因為這里對于返回的數據也是有參數要求的，那我們就把需要的參數放進去，代碼如下：
public class DataTableJSONResponse { Object sEcho; Object iTotalRecords; //查詢的記錄數 Object iTotalDisplayRecords; //過濾后的記錄數 Object aaData; public DataTableJSONResponse() { super(); } public DataTableJSONResponse(Object aaData) { super(); this.aaData = aaData; } public DataTableJSONResponse(Object sEcho, Object iTotalRecords, Object iTotalDisplayRecords, Object aaData) { super(); this.sEcho = sEcho; this.iTotalRecords = iTotalRecords; this.iTotalDisplayRecords = iTotalDisplayRecords; this.aaData = aaData; } public Object getAaData() { return aaData; } public void setAaData(Object aaData) { this.aaData = aaData; } public Object getsEcho() { return sEcho; } public void setsEcho(Object sEcho) { this.sEcho = sEcho; } public Object getiTotalRecords() { return iTotalRecords; } public void setiTotalRecords(Object iTotalRecords) { this.iTotalRecords = iTotalRecords; } public Object getiTotalDisplayRecords() { return iTotalDisplayRecords; } public void setiTotalDisplayRecords(Object iTotalDisplayRecords) { this.iTotalDisplayRecords = iTotalDisplayRecords; }}完整的Servlet：
public class Action extends HttpServlet { /** * */ private static final long serialVersionUID = 5957315496919679612L; @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 編碼設置 request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); response.setCharacterEncoding("UTF-8"); // 把傳送過來的JSON字符串轉成JSON數組 JSONArray ja = JSONArray.fromObject(request.getParameter("aodata")); // 獲取需要的參數值 String sEcho = null; Integer iColumns = null; Integer iDisplayStart = null; Integer iDisplayLength = null; List<String> mDataProp = new ArrayList<String>(); //存放列名 String sSearch = null; Integer iSortCol_0 = null; String iSortCol = null; String sSortDir_0 = null; for (int i = 0; i < ja.size(); i++) { if (ja.getJSONObject(i).getString("name").equals("sEcho")) sEcho = ja.getJSONObject(i).getString("value"); else if (ja.getJSONObject(i).getString("name").equals("iColumns")) iColumns = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("iDisplayStart")) iDisplayStart = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("iDisplayLength")) iDisplayLength = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("sSearch")) sSearch = ja.getJSONObject(i).getString("value"); else if (ja.getJSONObject(i).getString("name").equals("iSortCol_0")) iSortCol_0 = Integer.valueOf(ja.getJSONObject(i).getString("value")); else if (ja.getJSONObject(i).getString("name").equals("sSortDir_0")) sSortDir_0 = ja.getJSONObject(i).getString("value"); else if (iColumns != null) { for (int j = 0; j < iColumns; j++) if (ja.getJSONObject(i).getString("name").equals("mDataProp_" + j)) mDataProp.add(ja.getJSONObject(i).getString("value")); } } iSortCol = mDataProp.get(iSortCol_0); String sql = null; if(sSearch.equals("")) sql = "select * from(select id,name,age,rownum rn from dtdemo_xxx)" +"where rn between " + iDisplayStart + " and " + (iDisplayStart+iDisplayLength) +" order by " + iSortCol + " " + sSortDir_0; else sql = "select * from(select id,name,to_char(age,999) age,rownum rn from dtdemo_xxx where id like '%" + sSearch +"%' or name like '%"+ sSearch +"%' or age like '%"+ sSearch +"%')" +"where rn between " + iDisplayStart + " and " + (iDisplayStart+iDisplayLength) +" order by " + iSortCol + " " + sSortDir_0; System.out.println(sql); // 從數據庫獲取數據 List<User> listUser = Service.getInstance().getAll(sql); //獲取記錄數 int size = Service.getInstance().getAll().size(); // 數據封裝并返回給客戶端 DataTableJSONResponse dtjs = new DataTableJSONResponse(sEcho,size,size,listUser); JSONObject jsonObject = JSONObject.fromObject(dtjs); response.getWriter().print(jsonObject.toString()); }}至此，服務端分頁完成~
精彩專題分享：jquery分頁功能操作 JavaScript分頁功能操作
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