jqGrid 学习笔记整理——进阶篇（二）

jqGrid 学习笔记整理——进阶篇（二 ）

本篇开始正式与后台（java语言）进行数据交互，使用的平台为

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数据库管理工具)

一、数据库部分

1、创建数据库

使用Navicat for mysql创建数据库（使用其他工具或直接使用命令行暂不介绍）

2、创建表

双击打开上步创建数据库——右击Tables——选择New Table
建立如下字段 保存时会提示输入表名

二、程序部分

1、新建项目

使用myEclipse新建——Web Project
输入项目名称 选择java和运行该项目的Tomcat 一直点下一步 直到下图页面 点选下面自动生成web.xml文件的复选框 后完成

创建如下包结构并新建一个vo类（属性与数据库字段一一对应）

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、导入数据库连接和JSON文件的jar包

数据库连接jar包可以在mysql安装目录的如下目录查找到

另外下载JSON所需jar包，已上传百度云（http://pan.baidu.com/s/1dETGjRV）一起复制粘贴到WebRoot/WEB-INF/lib目录下 然后全选右键添加到构建路径

3、DAO设计模式的基本分层实现

参考《Java Web开发实战经典基础篇》这里不在叙述直接贴源码后续单独开一篇专门讲这部分基础知识

—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 自动生成的 catch 块
e.printStackTrace();
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
//System.out.println("连接数据库成功");
}

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

public void close(){
if(this.conn != null){
try {
this.conn.close();
} catch (SQLException e) {
// TODO 自动生成的 catch 块
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);
//查询方法
public List<demo> doSearch(String keys);
//删除方法
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 自动生成的 catch 块
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 自动生成的 catch 块
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 自动生成的 catch 块
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 自动生成的 catch 块
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(对前面的方法进行一次简单测试)

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("添加失败");
}
}
public static void  doChange(demo demo) {
if (Factory.getDemoDAOInstance().doChange(demo)) {
System.out.println("修改成功");
}else {
System.out.println("修改失败");
}
}
public static void  doDelete(int id) {
if (Factory.getDemoDAOInstance().doDelete(id)) {
System.out.println("删除成功");
}else {
System.out.println("删除失败");
}
}
}
/*
* 输出结果
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]
删除成功
SELECT id,name,type,pay,text FROM t_demo

* */

4、JSP页面和Servlet部分（重要）

—4.1、index.jsp（将index.html中html标签到html标签中的内容替换index.jsp中html的内容并对JS进行如下修改）

<%@ 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 浏览导航栏所在-->
<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">
//当 datatype 为"local" 时需填写

var grid_selector = "#grid-table";
var pager_selector = "#grid-pager";
$(document).ready(function() {
$("#grid-table").jqGrid({
//用于检索的Servlet URL
url:"<%=basePath%>"+"demoServlet",
//用于添加、修改、删除的Servlet URL
editurl: "<%=basePath%>"+"demochangeServlet",
//data: grid_data, //当 datatype 为"local" 时需填写
datatype:"json", //数据来源，本地数据（local，json,jsonp,xml等）
height: 150, //高度，表格高度。可为数值、百分比或'auto'
mtype:"GET",//提交方式
colNames: ['出库单号', '出库类型', '总金额', '申请人（单位）', '备注'],
colModel: [{
name: 'id',
index: 'id', //索引。其和后台交互的参数为sidx
key: true, //当从服务器端返回的数据中没有id时，将此作为唯一rowid使用只有一个列可以做这项设置。如果设置多于一个，那么只选取第一个，其他被忽略
width: 100,
editable: false,
editoptions: {
size: "20",
maxlength: "30"
}
}, {
name: 'type',
index: 'type',
width: 200, //宽度
editable: true, //是否可编辑
edittype: "select", //可以编辑的类型。可选值：text, textarea, select, checkbox, password, button, image and file.s
editoptions: {
value: "1:采购入库;2:退用入库"
}
}, {
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, //是否在浏览导航栏显示记录总数
rowNum: 10, //每页显示记录数
rowList: [10, 20, 30], //用于改变显示行数的下拉列表框的元素数组。
pager: pager_selector, //分页、按钮所在的浏览导航栏
altRows: true, //设置为交替行表格,默认为false
//toppager: true,//是否在上面显示浏览导航栏
multiselect: true, //是否多选
//multikey: "ctrlKey",//是否只能用Ctrl按键多选
multiboxonly: true, //是否只能点击复选框多选
// subGrid : true,
//sortname:'id',//默认的排序列名
//sortorder:'asc',//默认的排序方式（asc升序，desc降序）
caption: "采购退货单列表", //表名
autowidth: true //自动宽

});
//浏览导航栏添加功能部分代码
$(grid_selector).navGrid(pager_selector, {
search: true, // 检索
add: true, //添加  （只有editable为true时才能显示属性）
edit: true, //修改（只有editable为true时才能显示属性）
del: true, //删除
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");  //这里不设置编码会有乱码
response.setContentType("text/html;charset=utf-8");
response.setHeader("Cache-Control", "no-cache");
int rows = Integer.valueOf(request.getParameter("rows")); //每页中显示的记录行数
int page = Integer.valueOf(request.getParameter("page")); //当前的页码
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;//是否用于查询请求

List<demo> allList = new LinkedList<demo>();//返回结果集

String keys="";//查询条件字符串

if(search){
keys=" WHERE ";
String filters = request.getParameter("filters");//具体的条件
System.out.println(filters);
//传入数据的格式是类似这样的："{"groupOp":"AND","rules":[{"field":"id","op":"eq","data":"1"},{"field":"type","op":"ew","data":"2"}]}"
JSONObject jsonObject = JSONObject.fromObject(filters);
String groupOp = "AND";//每个规则之间的关系（and/or）
if (jsonObject.getString("groupOp")!=null&&!"".equals(jsonObject.getString("groupOp"))) {
if (jsonObject.getString("groupOp").equals("OR")) {
groupOp = "OR";
}
}

JSONArray rulesjson = jsonObject.getJSONArray("rules");
//遍历每个条件
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 = "";//用于存储单个条件sql语句片段
//开始转化为sql语句
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...之间
{
if (data.split(",").length==2) {
string=" BETWEEN '"+data.split(",")[0]+"' AND '"+data.split(",")[1]+"' ";
}else {
string=" = '"+data+"' ";//数据错误时处理
}
}

break;
case"bn"://不在...之间
{
if (data.split(",").length==2) {
string=" NOT BETWEEN '"+data.split(",")[0]+"' AND '"+data.split(",")[1]+"' ";
}else {
string=" <> '"+data+"' ";//数据错误时处理
}
}
break;
case"ew"://以...结束
string=" LIKE '%"+data+"' ";
break;
case "en"://不以...结束
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符号错误");//OP符号错误
}
if (op!=null) {
if (z==rulesjson.size()-1) {
keys+=" "+field+" "+string +" ";
}else {
keys+=" "+field+" "+string +" "+groupOp+" ";
}

}
}
}

//升降序SQL语句转换
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);
//分页部分
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();
//检索结果及分页信息封装 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单表功能已全部实现，例子中有哪些设计有问题请告知，下一篇将开始解决 主从表 的设计实现，敬请期待！