Java中jqGrid 學習筆記整理——進階篇(二)
更新時間：2016年04月17日 10:08:10 作者：XeonMic
這篇文章主要介紹了Java中jqGrid 學習筆記整理——進階篇(二)的相關(guān)資料,需要的朋友可以參考下
相關(guān)閱讀：
本篇開始正式與后臺（java語言）進行數(shù)據(jù)交互，使用的平臺為
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(shù)據(jù)庫管理工具)
一、數(shù)據(jù)庫部分
1、創(chuàng)建數(shù)據(jù)庫
使用Navicat for mysql創(chuàng)建數(shù)據(jù)庫（使用其他工具或直接使用命令行暫不介紹）
2、
2.創(chuàng)建表
雙擊打開上步創(chuàng)建數(shù)據(jù)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文件的復選框 后完成
創(chuàng)建如下包結(jié)構(gòu)并新建一個vo類（屬性與數(shù)據(jù)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(shù)據(jù)庫連接和JSON文件的jar包
數(shù)據(jù)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，已上傳百度云（http://pan.baidu.com/s/1dETGjRV）一起復制粘貼到WebRoot/WEB-INF/lib目錄下
然后全選右鍵添加到構(gòu)建路徑
3、DAO設計模式的基本分層實現(xiàn)
參考《Java Web開發(fā)實戰(zhàn)經(jīng)典基礎篇》這里不在敘述直接貼源碼后續(xù)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(shù)據(jù)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、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();
}
}
—3.6、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(jié)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標簽到html標簽中的內(nèi)容替換index.jsp中html的內(nèi)容并對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 為"local" 時需填寫
var grid_selector = "#grid-table";
var pager_selector = "#grid-pager";
$(document).ready(function() {
$("#grid-table").jqGrid({
//用于檢索的Servlet URL
url:"<%=basePath%>"+"demoServlet",
//用于添加、修改、刪除的Servlet URL
editurl: "<%=basePath%>"+"demochangeServlet",
//data: grid_data, //當 datatype 為"local" 時需填寫
datatype:"json", //數(shù)據(jù)來源，本地數(shù)據(jù)（local，json,jsonp,xml等）
height: 150, //高度，表格高度?？蔀閿?shù)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）', '備注'],
colModel: [{
name: 'id',
index: 'id', //索引。其和后臺交互的參數(shù)為sidx
key: true, //當從服務器端返回的數(shù)據(jù)中沒有id時，將此作為唯一rowid使用只有一個列可以做這項設置。如果設置多于一個，那么只選取第一個，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:采購入庫;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(shù)
rowNum: 10, //每頁顯示記錄數(shù)
rowList: [10, 20, 30], //用于改變顯示行數(shù)的下拉列表框的元素數(shù)組。
pager: pager_selector, //分頁、按鈕所在的瀏覽導航欄
altRows: true, //設置為交替行表格,默認為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, //是否只能點擊復選框多選
// 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: "采購退貨單列表", //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為true時才能顯示屬性）
edit: true, //修改（只有editable為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"); //這里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(shù)
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;//是否用于查詢請求
List<demo> allList = new LinkedList<demo>();//返回結(jié)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(shù)據(jù)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(guī)則之間的關(guān)系（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 = "";//用于存儲單個條件sql語句片段
//開始轉(zhuǎn)化為sql語句
switch (op) {
case "eq"://相等
string=" = '"+data+"' ";
break;
case "ne"://不相等
string=" <> '"+data+"' ";
break;
case "li"://小于
string=" < '"+data+"' ";
break;
case"le"://小于等于
string=" <= '"+data+"' ";
break;
case"gt"://大于
string=" > '"+data+"' ";
break;
case "ge"://大于等于
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(shù)據(jù)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(shù)據(jù)錯誤時處理
}
}
break;
case"ew"://以...結(jié)束
string=" LIKE '%"+data+"' ";
break;
case "en"://不以...結(jié)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(zhuǎn)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(jié)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(xiàn)，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(xiàn)，敬請關(guān)注腳本直接網(wǎng)站！
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