jqGrid 學習筆記整理——進階篇（二）

jqGrid 學習筆記整理——進階篇（二 ）

本篇開始正式與後臺（java語言）進行數據交互，使用的平臺爲

• JDK：java 1.8.0_71
• myEclisp 2015 Stable 2.0
• Apache Tomcat-8.0.30
• Mysql 5.7
• Navicat for mysql 11.2.5(mysql數據庫管理工具)

一、數據庫部分

1、創建數據庫

    使用Navicat for mysql創建數據庫（使用其他工具或直接使用命令行暫不介紹）

2、創建表

雙擊打開上步創建數據庫——右擊Tables——選擇New Table
建立如下字段 保存時會提示輸入表名

二、程序部分

1、新建項目

使用myEclipse新建——Web Project
輸入項目名稱 選擇java和運行該項目的Tomcat 一直點下一步 直到下圖頁面 點選下面自動生成web.xml文件的複選框 後完成

創建如下包結構並新建一個vo類（屬性與數據庫字段一一對應）

demo.java

package com.xeonmic.vo;

public class demo {
    private int id;
    private String name;
    private int type;
    private double pay;
    private String text;

    public demo() {
        // TODO Auto-generated constructor stub
    }

    public demo(int id, int type, Double pay,String name, String text) {
        this.id = id;
        this.name = name;
        this.type = type;
        this.pay = pay;
        this.text = text;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getType() {
        return type;
    }
    public void setType(int type) {
        this.type = type;
    }
    public double getPay() {
        return pay;
    }
    public void setPay(Double pay) {
        this.pay = pay;
    }
    public String getText() {
        return text;
    }
    public void setText(String text) {
        this.text = text;
    }
    @Override
    public String toString() {
        return "demo [id=" + id + ", name=" + name + ", type=" + type
                + ", pay=" + pay + ", text=" + text + "]";
    }
}

2、導入數據庫連接和JSON文件的jar包

數據庫連接jar包可以在mysql安裝目錄的如下目錄查找到

另外下載JSON所需jar包，已上傳百度雲（http://pan.baidu.com/s/1dETGjRV）一起復制粘貼到WebRoot/WEB-INF/lib目錄下 然後全選右鍵添加到構建路徑

3、DAO設計模式的基本分層實現

參考《Java Web開發實戰經典基礎篇》這裏不在敘述直接貼源碼後續單獨開一篇專門講這部分基礎知識

—3.1、DatabaseConnection.java

package com.xeonmic.dbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;


public class DatabaseConnection {
    private static final String DBDRIVER="org.gjt.mm.mysql.Driver";
    private static final String DBURL="jdbc:mysql://localhost:3306/jqgriddemo";
    private static final String DBUSER="root";
    private static final String DBPASSWORD="1234";
    private Connection conn =null;

    public DatabaseConnection(){
        try {
            Class.forName(DBDRIVER);
            this.conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
        } catch (ClassNotFoundException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        }
        //System.out.println("連接數據庫成功");
    }

    public Connection getConnection(){
        return this.conn;
    }

    public void close(){
        if(this.conn != null){
            try {
                this.conn.close();
            } catch (SQLException e) {
                // TODO 自動生成的 catch 塊
                e.printStackTrace();
            }
        }
    }

}

—3.2、DemoDAO.java

package com.xeonmic.dao;

import java.util.List;
import com.xeonmic.vo.demo;

public interface DemoDAO {
    //添加方法
    public boolean doCreate(demo demo);
    //查詢方法
    public List<demo> doSearch(String keys);
    //刪除方法
    public boolean doDelete(int id);
    //修改方法
    public boolean doChange(demo demo);

}

—3.3、DemoDAOImpl.java

package com.xeonmic.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.xeonmic.dao.DemoDAO;
import com.xeonmic.vo.demo;

public class DemoDAOImpl implements DemoDAO {
    private Connection conn = null;
    private PreparedStatement pstmt = null;

    public DemoDAOImpl(Connection conn){
        this.conn=conn;
    }

    @Override
    public boolean doCreate(demo demo) {
        boolean flag = false;
        String sql = "INSERT INTO t_demo(type,pay,name,text ) VALUES(?,?,?,?)";
        try {
            this.pstmt = this.conn.prepareStatement(sql);
            this.pstmt.setInt(1, demo.getType());
            this.pstmt.setDouble(2, demo.getPay());
            this.pstmt.setString(3, demo.getName());
            this.pstmt.setString(4, demo.getText());
            if(this.pstmt.executeUpdate()>0){
                flag = true;
            }
            this.pstmt.close();
        } catch (SQLException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        }
        return flag;
    }

    @Override
    public List<demo> doSearch(String keys) {
        // TODO Auto-generated method stub
        if (keys==null) {
            keys="";
        }
        String sql = "SELECT id,name,type,pay,text FROM t_demo "+keys;
        List<demo> all = new ArrayList<demo>();
        System.out.println(sql);
         try {              
                this.pstmt = this.conn.prepareStatement(sql);       
                ResultSet rs = this.pstmt.executeQuery();
                demo demo = null;
                while(rs.next()){
                    demo = new demo(rs.getInt("id"),rs.getInt("type"),rs.getDouble("pay"),rs.getString("name"),rs.getString("text"));                   
                    all.add(demo);
                }
                this.pstmt.close();         
            } catch (SQLException e) {
                // TODO 自動生成的 catch 塊
                e.printStackTrace();
            }
        return all;
    }

    @Override
    public boolean doDelete(int id) {
        boolean flag = false;
        String sql = "DELETE FROM t_demo WHERE id = ?";

        try {
            this.pstmt = this.conn.prepareStatement(sql);
            this.pstmt.setInt(1, id);
            if(this.pstmt.executeUpdate()>0){
                flag = true;
            }
            this.pstmt.close();

        } catch (SQLException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        }
        return flag;
    }

    @Override
    public boolean doChange(demo demo) {
        boolean flag = false;
        String sql = "UPDATE t_demo SET type=?,pay=?,name=?,text=? WHERE id=?";
        try {
            this.pstmt = this.conn.prepareStatement(sql);
            this.pstmt.setInt(5, demo.getId());
            this.pstmt.setInt(1, demo.getType());
            this.pstmt.setDouble(2, demo.getPay());
            this.pstmt.setString(3, demo.getName());
            this.pstmt.setString(4, demo.getText());
            if(this.pstmt.executeUpdate()>0){
                flag = true;
            }
            this.pstmt.close();
        } catch (SQLException e) {
            // TODO 自動生成的 catch 塊
            e.printStackTrace();
        }
        return flag;
    }

}

—3.5 DemoDAOProxy.java

package com.xeonmic.dao.proxy;

import java.util.List;
import com.xeonmic.dao.DemoDAO;
import com.xeonmic.dao.impl.DemoDAOImpl;
import com.xeonmic.dbc.DatabaseConnection;
import com.xeonmic.vo.demo;

public class DemoDAOProxy implements DemoDAO {
    private DatabaseConnection dbc = null;
    private DemoDAO ddao = null;

    public DemoDAOProxy(){
        this.dbc = new DatabaseConnection();
        this.ddao = new DemoDAOImpl(this.dbc.getConnection());
    }

    @Override
    public boolean doCreate(demo demo) {
        boolean flag = false;
        flag = this.ddao.doCreate(demo);
        this.dbc.close();
        return flag;
    }

    @Override
    public List<demo> doSearch(String keys) {
        // TODO Auto-generated method stub
        List<demo> all = null;
        all = this.ddao.doSearch(keys);
        this.dbc.close();
        return all;
    }

    @Override
    public boolean doDelete(int id) {
        boolean flag = false;
        flag = this.ddao.doDelete(id);
        this.dbc.close();
        return flag;
    }

    @Override
    public boolean doChange(demo demo) {
        boolean flag = false;
        flag = this.ddao.doChange(demo);
        this.dbc.close();
        return flag;
    }

}

—3.6、Factory.java

package com.xeonmic.factory;

import com.xeonmic.dao.DemoDAO;
import com.xeonmic.dao.proxy.DemoDAOProxy;

public class Factory {
    public static DemoDAO getDemoDAOInstance(){
        return new DemoDAOProxy();
    }
}

—3.7、Demotest.java(對前面的方法進行一次簡單測試)

package com.xeonmic.test;

import java.util.LinkedList;
import java.util.List;

import com.xeonmic.factory.Factory;
import com.xeonmic.vo.demo;

public class Demotest {
    public static void main(String[] args) {
        demo demo1 = new demo();
        demo1.setName("Name");
        demo1.setPay(0.98);
        demo1.setType(1);
        demo1.setText("Text");
        doCreate(demo1);
        doSearch(null);

        if (doSearch(null)!=null&&!doSearch(null).isEmpty()) {
            demo1 = doSearch("").get(0);
            demo1.setText("Change Text");
            doChange(demo1);
            doSearch("WHERE id = "+demo1.getId());

            doDelete(demo1.getId());
            doSearch(null);
        }
    }

    public static List<demo>  doSearch(String keys) {
        List<demo> allDemos = new LinkedList<demo>();
        allDemos = Factory.getDemoDAOInstance().doSearch(keys);
        for (demo demo : allDemos) {
            System.out.println(demo.toString());
        }
        return allDemos;
    }
    public static void  doCreate(demo demo) {
        if (Factory.getDemoDAOInstance().doCreate(demo)) {
            System.out.println("添加成功");
        }else {
            System.out.println("添加失敗");
        }
    }
    public static void  doChange(demo demo) {
        if (Factory.getDemoDAOInstance().doChange(demo)) {
            System.out.println("修改成功");
        }else {
            System.out.println("修改失敗");
        }
    }
    public static void  doDelete(int id) {
        if (Factory.getDemoDAOInstance().doDelete(id)) {
            System.out.println("刪除成功");
        }else {
            System.out.println("刪除失敗");
        }
    }
}
/*
 * 輸出結果
        添加成功
        SELECT id,name,type,pay,text FROM t_demo 
        demo [id=1, name=Name, type=1, pay=0.98, text=Text]
        SELECT id,name,type,pay,text FROM t_demo 
        demo [id=1, name=Name, type=1, pay=0.98, text=Text]
        SELECT id,name,type,pay,text FROM t_demo 
        demo [id=1, name=Name, type=1, pay=0.98, text=Text]
        SELECT id,name,type,pay,text FROM t_demo 
        demo [id=1, name=Name, type=1, pay=0.98, text=Text]
        修改成功
        SELECT id,name,type,pay,text FROM t_demo WHERE id = 1
        demo [id=1, name=Name, type=1, pay=0.98, text=Change Text]
        刪除成功
        SELECT id,name,type,pay,text FROM t_demo 

 * */

4、JSP頁面和Servlet部分（重要）
—4.1、index.jsp（將index.html中html標籤到html標籤中的內容替換index.jsp中html的內容並對JS進行如下修改）

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

    <head>
        <title>DEMO</title>

        <link rel="stylesheet" type="text/css" href="css/jquery-ui.min.css" />
        <link rel="stylesheet" type="text/css" href="css/jquery-ui.theme.min.css" />
        <link rel="stylesheet" type="text/css" href="css/ui.jqgrid-bootstrap-ui.css" />
        <link rel="stylesheet" type="text/css" href="css/ui.jqgrid.css" />
    </head>

    <body>
        <div class="main" id="main">
            <!--jqGrid所在-->
            <table id="grid-table"></table>
            <!--jqGrid 瀏覽導航欄所在-->
            <div id="grid-pager"></div>

        </div>

        <script src="js/jquery-1.11.0.min.js" type="text/javascript" charset="utf-8"></script>
        <script src="js/i18n/grid.locale-cn.js" type="text/javascript" charset="utf-8"></script>
        <script src="js/jquery.jqGrid.min.js" type="text/javascript" charset="utf-8"></script>

        <script type="text/javascript">
            //當 datatype 爲"local" 時需填寫   

            var grid_selector = "#grid-table";
            var pager_selector = "#grid-pager";
            $(document).ready(function() {
                $("#grid-table").jqGrid({
                    //用於檢索的Servlet URL
                    url:"<%=basePath%>"+"demoServlet", 
                    //用於添加、修改、刪除的Servlet URL
                    editurl: "<%=basePath%>"+"demochangeServlet",
                    //data: grid_data, //當 datatype 爲"local" 時需填寫  
                    datatype:"json", //數據來源，本地數據（local，json,jsonp,xml等）
                    height: 150, //高度，表格高度。可爲數值、百分比或'auto'
                    mtype:"GET",//提交方式
                    colNames: ['出庫單號', '出庫類型', '總金額', '申請人（單位）', '備註'],
                    colModel: [{
                        name: 'id',
                        index: 'id', //索引。其和後臺交互的參數爲sidx
                        key: true, //當從服務器端返回的數據中沒有id時，將此作爲唯一rowid使用只有一個列可以做這項設置。如果設置多於一個，那麼只選取第一個，其他被忽略
                        width: 100,
                        editable: false,
                        editoptions: {
                            size: "20",
                            maxlength: "30"
                        }
                    }, {
                        name: 'type',
                        index: 'type',
                        width: 200, //寬度
                        editable: true, //是否可編輯
                        edittype: "select", //可以編輯的類型。可選值：text, textarea, select, checkbox, password, button, image and file.s
                        editoptions: {
                            value: "1:採購入庫;2:退用入庫"
                        }
                    }, {
                        name: 'pay',
                        index: 'pay',
                        width: 60,
                        sorttype: "double",
                        editable: true
                    }, {
                        name: 'name',
                        index: 'name',
                        width: 150,
                        editable: true,
                        editoptions: {
                            size: "20",
                            maxlength: "30"
                        }
                    }, {
                        name: 'text',
                        index: 'text',
                        width: 250,
                        sortable: false,
                        editable: true,
                        edittype: "textarea",
                        editoptions: {
                            rows: "2",
                            cols: "10"
                        }
                    }, ],
                    viewrecords: true, //是否在瀏覽導航欄顯示記錄總數
                    rowNum: 10, //每頁顯示記錄數
                    rowList: [10, 20, 30], //用於改變顯示行數的下拉列表框的元素數組。
                    pager: pager_selector, //分頁、按鈕所在的瀏覽導航欄
                    altRows: true, //設置爲交替行表格,默認爲false
                    //toppager: true,//是否在上面顯示瀏覽導航欄
                    multiselect: true, //是否多選
                    //multikey: "ctrlKey",//是否只能用Ctrl按鍵多選
                    multiboxonly: true, //是否只能點擊複選框多選
                    // subGrid : true, 
                    //sortname:'id',//默認的排序列名
                    //sortorder:'asc',//默認的排序方式（asc升序，desc降序）
                    caption: "採購退貨單列表", //表名
                    autowidth: true //自動寬

                });
                //瀏覽導航欄添加功能部分代碼
                $(grid_selector).navGrid(pager_selector, {
                        search: true, // 檢索
                        add: true, //添加  （只有editable爲true時才能顯示屬性）
                        edit: true, //修改（只有editable爲true時才能顯示屬性）
                        del: true, //刪除
                        refresh: true //刷新
                    }, {}, // edit options
                    {}, // add options
                    {}, // delete options
                    {
                        multipleSearch: true
                    } // search options - define multiple search
                );
            });
        </script>
    </body>

</html>

—4.2、demoServlet.java

package com.xeonmic.action;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import com.xeonmic.factory.Factory;
import com.xeonmic.vo.demo;

/**
 * Servlet implementation class demoServlet
 */
public class demoServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;




    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");  //這裏不設置編碼會有亂碼
        response.setContentType("text/html;charset=utf-8");
        response.setHeader("Cache-Control", "no-cache");  
        int rows = Integer.valueOf(request.getParameter("rows")); //每頁中顯示的記錄行數
        int page = Integer.valueOf(request.getParameter("page")); //當前的頁碼
        String sord = request.getParameter("sord");//排序方式
        String sidx = request.getParameter("sidx");//排序列名
        Boolean search =(request.getParameter("_search").equals("true"))?true:false;//是否用於查詢請求

        List<demo> allList = new LinkedList<demo>();//返回結果集

        String keys="";//查詢條件字符串

        if(search){
            keys=" WHERE ";
            String filters = request.getParameter("filters");//具體的條件
            System.out.println(filters);
            //傳入數據的格式是類似這樣的："{"groupOp":"AND","rules":[{"field":"id","op":"eq","data":"1"},{"field":"type","op":"ew","data":"2"}]}"
            JSONObject jsonObject = JSONObject.fromObject(filters);
            String groupOp = "AND";//每個規則之間的關係（and/or）
            if (jsonObject.getString("groupOp")!=null&&!"".equals(jsonObject.getString("groupOp"))) {
                if (jsonObject.getString("groupOp").equals("OR")) {
                    groupOp = "OR";
                }
            }

            JSONArray rulesjson = jsonObject.getJSONArray("rules");
            //遍歷每個條件
            for (int z=0; z < rulesjson.size(); z++) {
                Object t = rulesjson.get(z);
                JSONObject rulejson = JSONObject.fromObject(t);
                String field = rulejson.getString("field");
                String op = rulejson.getString("op");
                String data = rulejson.getString("data");
                String string = "";//用於存儲單個條件sql語句片段
                //開始轉化爲sql語句
                switch (op) {
                case "eq"://相等
                    string=" = '"+data+"' ";
                    break;
                case "ne"://不相等
                    string=" <> '"+data+"' ";
                    break;
                case "li"://小於
                    string=" < '"+data+"' ";
                    break;
                case"le"://小於等於
                    string=" <= '"+data+"' ";
                    break;
                case"gt"://大於
                    string=" > '"+data+"' ";
                    break;
                case "ge"://大於等於
                    string=" >= '"+data+"' ";
                    break;
                case "bw"://在...之間
                    {
                        if (data.split(",").length==2) {
                            string=" BETWEEN '"+data.split(",")[0]+"' AND '"+data.split(",")[1]+"' ";
                        }else {
                            string=" = '"+data+"' ";//數據錯誤時處理
                        }
                    }   

                    break;
                case"bn"://不在...之間
                    {
                        if (data.split(",").length==2) {
                            string=" NOT BETWEEN '"+data.split(",")[0]+"' AND '"+data.split(",")[1]+"' ";
                        }else {
                            string=" <> '"+data+"' ";//數據錯誤時處理
                        }
                    }
                    break;
                case"ew"://以...結束
                    string=" LIKE '%"+data+"' ";
                    break;
                case "en"://不以...結束
                    string=" NOT LIKE '%"+data+"' ";
                    break;
                case "cn"://包含
                    string=" LIKE '%"+data+"%' ";
                    break;
                case "nc"://不包含
                    string=" NOT LIKE '%"+data+"%' ";
                    break;
                case "in"://在
                    {
                        string=" IN ( ";
                        String[] datas = data.split(",");
                        for (int i = 0; i < datas.length; i++) {
                            string+= " '"+datas[i]+"' ";
                            if (i!=datas.length-1) {
                                string += ",";
                            }else {
                                string += " ) ";
                            }
                        }
                    }
                    break;
                case "ni"://不在
                    {
                        string=" NOT IN ( ";
                        String[] datas = data.split(",");
                        for (int i = 0; i < datas.length; i++) {
                            string+= " '"+datas[i]+"' ";
                            if (i!=datas.length-1) {
                                string += ",";
                            }else {
                                string += " ) ";
                            }
                        }
                    }
                    break;
                default:
                    op=null;
                    System.out.println("OP符號錯誤");//OP符號錯誤
                }
                if (op!=null) {
                    if (z==rulesjson.size()-1) {
                        keys+=" "+field+" "+string +" ";
                    }else {
                        keys+=" "+field+" "+string +" "+groupOp+" ";
                    }

                }
            }
        }

        //升降序SQL語句轉換
        if (sidx!=null&&!"".equals(sidx)) {
            System.out.println(sidx);
            keys += " ORDER BY " + sidx;
            System.out.println("sord="+sord);
            if (!sord.equals("asc")) {
                keys += " DESC ";
            }
        }
        allList = Factory.getDemoDAOInstance().doSearch(keys);
        //分頁部分
        int total=0;    
        total=(allList.size()%rows==0)?(allList.size()/rows):((allList.size()/rows)+1);
        int j = 0;
        int m = (page-1)*rows;
        int n  =  (page-1)*rows+rows;
        JSONArray jArray = new JSONArray();
        for (j=m; j<allList.size()&&j<n; j++) {     
                jArray.add(JSONObject.fromObject(allList.get(j)));              
        }

        JSONObject jjson = new JSONObject();        
        //檢索結果及分頁信息封裝 返回
        jjson.accumulate("page", page);
        jjson.accumulate("total", total);
        jjson.accumulate("records", allList.size());
        jjson.accumulate("rows", jArray);
        System.out.println(jjson.toString());
        response.getWriter().write(jjson.toString());
    }


    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(request, response);
    }

}

—4.3、demochangeServlet.java

package com.xeonmic.action;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.xeonmic.factory.Factory;
import com.xeonmic.vo.demo;

public class demochangeServlet extends HttpServlet {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        boolean flag = false;
        String oper =request.getParameter("oper");
        switch (oper) {
            case "del":
                {
                    String[] ids = request.getParameter("id").split(",");
                    for (int i = 0; i < ids.length; i++) {
                        int id =Integer.valueOf(ids[i]);
                        flag=Factory.getDemoDAOInstance().doDelete(id);
                    }

                }           
                break;
            case "add":
                {
                    int type = Integer.valueOf(request.getParameter("type"));
                    Double pay = Double.valueOf(request.getParameter("pay"));
                    String name = request.getParameter("name");
                    String text = request.getParameter("text");
                    demo demo = new demo(-1,type,pay,name,text);
                    flag = Factory.getDemoDAOInstance().doCreate(demo);                         
                }
                break;
            case "edit":
                {
                    int id = Integer.valueOf(request.getParameter("id"));
                    int type = Integer.valueOf(request.getParameter("type"));
                    Double pay = Double.valueOf(request.getParameter("pay"));
                    String name = request.getParameter("name");
                    String text = request.getParameter("text");
                    demo demo = new demo(id,type,pay,name,text);
                    flag = Factory.getDemoDAOInstance().doChange(demo);                         
                }
                break;

            default:
                break;
        }
        System.out.println(flag);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        this.doGet(request, response);
    }

}

—4.4、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>jqGrid</display-name>
  <servlet>
    <servlet-name>demoServlet</servlet-name>
    <servlet-class>com.xeonmic.action.demoServlet</servlet-class>
  </servlet>

  <servlet>
    <servlet-name>demochangeServlet</servlet-name>
    <servlet-class>com.xeonmic.action.demochangeServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>demoServlet</servlet-name>
    <url-pattern>/demoServlet</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>demochangeServlet</servlet-name>
    <url-pattern>/demochangeServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

至此，jqGrid單表功能已全部實現，例子中有哪些設計有問題請告知，下一篇將開始解決 主從表 的設計實現，敬請期待！