所用技术：
JS+Servlet、bootstrap前端框架、JQuery Validate 验证框架、MySQL数据库；
DAO 设计模式；
基于Servlet + JSP + JavaBean 的MVC设计模式。
小技术点：MD5加密操作，分页小脚本。
功能：
1、后台登录
超级管理员登录能看到超级管理员菜单（全局flag）
普通管理员登录
2、用户管理
用户录入
3、图书类别管理
添加分类
类别列表
4、图书管理
增加图书
图书列表
5、借书登记
借书信息录入
借书信息列表
数据库设计：
数据库脚本：
1 --删除数据库 2 drop database booksystem; 3 4 --创建数据库 5 create database booksystem; 6 7 --使用数据库 8 use booksystem; 9 10 --删除数据表 11 drop table if exists admin; 12 13 drop table if exists item; 14 15 drop table if exists books; 16 17 drop table if exists member; 18 19 drop table if exists lenbooks; 20 21 --创建数据表 22 /*==============================================================*/ 23 /* Table: admin 管理员表 */ 24 /*==============================================================*/ 25 create table admin 26 ( 27 aid varchar(50) not null, 28 password varchar(32), 29 lastdate datetime, 30 flag int, --1 超级管理员 31 status int, --1 表示激活 32 primary key (aid) 33 ); 34 35 /*==============================================================*/ 36 /* Table: item 图书类别表 */ 37 /*==============================================================*/ 38 create table item 39 ( 40 iid int not null auto_increment, 41 name varchar(100), 42 note text, --备注、简介 43 primary key (iid) 44 ); 45 46 /*==============================================================*/ 47 /* Table: books 图书详情表 */ 48 /*==============================================================*/ 49 create table books 50 ( 51 bid int not null auto_increment, 52 iid int, --图书类别id 53 aid varchar(50), --管理员id 54 name varchar(100), --书名儿 55 credate datetime, --上架日期 56 status int, --1 上架 57 note text, --简介 58 primary key (bid) 59 ); 60 61 alter table books add constraint FK_Reference_1 foreign key (iid) 62 references item (iid) on delete cascade; 63 64 alter table books add constraint FK_Reference_3 foreign key (aid) 65 references admin (aid) on delete cascade; 66 67 /*==============================================================*/ 68 /* Table: member 用户表 */ 69 /*==============================================================*/ 70 create table member 71 ( 72 mid varchar(50) not null, 73 name varchar(50), 74 age int, 75 sex int, 76 phone varchar(32), 77 primary key (mid) 78 ); 79 80 /*==============================================================*/ 81 /* Table: lenbook 借书详情表 */ 82 /*==============================================================*/ 83 create table lenbook 84 ( 85 leid int not null auto_increment, 86 mid varchar(50), --用户id（借书人id） 87 bid int, --图书id 88 credate datetime, --借出时间 89 retdate datetime, --归还时间 90 primary key (leid) 91 ); 92 93 alter table lenbook add constraint FK_Reference_2 foreign key (mid) 94 references member (mid) on delete cascade; 95 96 alter table lenbook add constraint FK_Reference_4 foreign key (bid) 97 references books (bid) on delete cascade; 98 99 --增加测试数据 100 --管理员ID:admin，管理员密码：admin123 101 --F5866C4A4D6014ECCED47960C2E3D07F 是进行MD5加密后的字符串 102 insert into admin(aid,password,flag,status) values(‘admin‘,‘F5866C4A4D6014ECCED47960C2E3D07F‘,1,1); 103 insert into admin(aid,password,flag,status) values(‘root‘,‘F5866C4A4D6014ECCED47960C2E3D07F‘,1,1); 104 105 --图书表 106 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘1‘, ‘root‘, ‘Java WEB 开发‘, ‘2017-09-04 20:42:21‘, ‘1‘, ‘Java WEB 从入门到精通有木有呀。‘); 107 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘2‘, ‘admin‘, ‘二胡鉴赏‘, ‘2017-09-04 20:45:51‘, ‘1‘, ‘二胡从入门到精通呀。‘); 108 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘1‘, ‘admin‘, ‘C语言原理‘, ‘2017-09-04 21:09:04‘, ‘1‘, ‘C语言基础和原理篇（计算机系必修）。‘); 109 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘2‘, ‘root‘, ‘古典音乐鉴赏‘, ‘2017-09-04 21:09:47‘, ‘1‘, ‘古典音乐通俗化鉴赏（必修）‘); 110 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘1‘, ‘admin‘, ‘C++ 面向对象编程和设计‘, ‘2017-09-04 21:10:58‘, ‘1‘, ‘体会面向过程编程和面向对象编程的区别和好处。‘); 111 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘2‘, ‘root‘, ‘竹笛基础教程‘, ‘2017-09-04 21:11:33‘, ‘1‘, ‘竹笛基础教程（选修之一），多动手。‘); 112 INSERT INTO books(iid,aid,name,credate,status,note) VALUES (‘1‘, ‘admin‘, ‘数据结构（C语言版）‘, ‘2017-09-04 21:12:02‘, ‘1‘, ‘体会数据结构的无穷魅力。‘); 113 114 --图书分类表 115 INSERT INTO item VALUES (‘1‘, ‘计算机科学&技术‘, ‘计算机相关专业书籍。‘); 116 INSERT INTO item VALUES (‘2‘, ‘文化艺术‘, ‘文艺专业相关书籍。‘); 117 118 --提交 119 commit;
基本开发流程：
可行性分析；
概要设计（概要设计说明书、ER图）；
详细设计（数据库详细设计，系统设计UI设计、后台框架技术使用等）。
几个关键的流程：
DAO层：
1、先创建DatabaseConnection类，用于数据库连接；
1 package com.shawn.book.dbc;
2
3 import java.sql.Connection;
4 import java.sql.DriverManager;
5 import java.sql.SQLException;
6
7 public class DatabaseConnection {
8
9 public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
10
11 public static final String DBURL = "jdbc:mysql://localhost:3306/booksystem";
12
13 public static final String DBUSER = "root";
14
15 public static final String DBPASSWORD = "root";
16
17 private Connection conn = null;
18
19 public DatabaseConnection(){
20 try {
21 //加载驱动
22 Class.forName(DBDRIVER);
23 //创建数据库连接
24 this.conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
25 } catch (SQLException e) {
26 e.printStackTrace();
27 } catch (ClassNotFoundException e) {
28 e.printStackTrace();
29 }
30 }
31
32 /**
33 * 获取数据库连接
34 * @return
35 */
36 public Connection getConn() {
37 return this.conn;
38 }
39
40 /**
41 * 关闭数据库连接
42 */
43 public void close(){
44 if(this.conn != null){
45 try {
46 this.conn.close();
47 } catch (SQLException e) {
48 e.printStackTrace();
49 }
50 }
51 }
52
53 }
2、建AbstractDAOImpl 类，只有两个属性 pstmt(PreparedStatement类型)、conn(Connection 类型)，一个构造方法；
1 package com.shawn.book.dao;
2
3 import java.sql.Connection;
4 import java.sql.PreparedStatement;
5
6 public abstract class AbstractDAOImpl {
7
8 protected Connection conn;
9
10 protected PreparedStatement pstmt;
11
12 public AbstractDAOImpl(Connection conn){
13 this.conn = conn;
14 }
15
16 }
2、建DAO层接口接口（举例）：
IDAO 公共的方法
---> IAdminDAO 继承IDAO，如果有需要可以添加自己特定的方法
---> IAdminDAOImpl(实现IAdminDAO接口，继承AbstractDAOImpl类)
---> DAOFactory进行注册 静态获取各个实现类
IDAO
1 package com.shawn.book.dao;
2
3 import java.sql.SQLException;
4 import java.util.List;
5 import java.util.Set;
6
7 /**
8 * 这个接口表示一个公共的DAO接口
9 * @author Shawn
10 *
11 * @param <K> 表示主键
12 * @param <V> 表示要操作的对象
13 */
14 public interface IDAO<K,V> {
15
16 /**
17 * 实现数据增加操作
18 * @param vo 表示要执行操作的对象
19 * @return 成功返回 true，失败返回 false
20 * @throws SQLException
21 */
22 boolean doCreate(V vo) throws SQLException;
23
24 /**
25 * 实现数据更新操作
26 * @param vo 表示要执行更新的对象
27 * @return 成功返回 true，失败返回 false
28 * @throws SQLException
29 */
30 boolean doUpdate(V vo) throws SQLException;
31
32 /**
33 * 实现数据批量删除
34 * @param ids 表示要执行删除的数据集合
35 * @return 成功返回 true，失败返回 false
36 * @throws SQLException
37 */
38 boolean doRemove(Set<?> ids) throws SQLException;
39
40 /**
41 * 根据用户提供的id执行查询
42 * @param id 表示要查询的id
43 * @return 查询成功返回该数据行的记录，失败返回null
44 * @throws SQLException
45 */
46 V findById(K id) throws SQLException;
47
48 /**
49 * 实现数据全部查询
50 * @return 成功返回全部数据，失败返回null
51 * @throws SQLException
52 */
53 List<V> findAll() throws SQLException;
54
55 /**
56 * 实现数据分页操作
57 * @param column 表示要执行查询的列
58 * @param keyWord 表示查询关键字
59 * @param currentPage 表示当前页
60 * @param lineSize 表示每页显示记录数
61 * @return 查询成功返回满足条件的数据，失败返回null
62 * @throws SQLException
63 */
64 List<V> findBySplit(
65 String column,
66 String keyWord,
67 Integer currentPage,
68 Integer lineSize
69 ) throws SQLException;
70
71 /**
72 * 实现数据量统计操作
73 * @param column 表示要查询的列
74 * @param keyWord 表示查询关键字
75 * @return 成功返回数据量，失败返回0
76 * @throws SQLException
77 */
78 Integer getAllCount(
79 String column,
80 String keyWord
81 ) throws SQLException;
82 }
IAdminDAO
1 package com.shawn.book.dao;
2
3 import com.shawn.book.vo.Admin;
4
5 public interface IAdminDAO extends IDAO<String, Admin> {
6
7 /**
8 * 实现用户登录检查操作
9 * @param vo 表示要执行检查的对象（aid,password,flag）
10 * @return 成功返回 ture,失败返回 false
11 * @throws Exception
12 */
13 public boolean findLogin(Admin vo) throws Exception;
14
15 /**
16 * 实现用数据更新操作
17 * @param aid 要更新的主键
18 * @return
19 * @throws Exception
20 */
21 public boolean doUpdateByLastDate(String aid) throws Exception;
22 }
AdminDAOImpl
1 package com.shawn.book.dao.impl;
2
3 import java.sql.Connection;
4 import java.sql.ResultSet;
5 import java.sql.SQLException;
6 import java.sql.Timestamp;
7 import java.util.ArrayList;
8 import java.util.Date;
9 import java.util.List;
10 import java.util.Set;
11
12 import com.shawn.book.dao.AbstractDAOImpl;
13 import com.shawn.book.dao.IAdminDAO;
14 import com.shawn.book.vo.Admin;
15
16 public class AdminDAOImpl extends AbstractDAOImpl implements IAdminDAO{
17
18 public AdminDAOImpl(Connection conn) {//conn从外部传入
19 super(conn);
20 }
21
22 @Override
23 public boolean doCreate(Admin vo) throws SQLException {
24 String sql = "insert into admin(aid,password,status) values(?,?,?)";
25 super.pstmt = super.conn.prepareStatement(sql);
26 super.pstmt.setString(1, vo.getAid());
27 super.pstmt.setString(2, vo.getPassword());
28 // super.pstmt.setTimestamp(3, new java.sql.Timestamp(vo.getLastDate().getTime()));
29 super.pstmt.setInt(3, vo.getStatus());
30 int rel = super.pstmt.executeUpdate();
31 return rel > 0;
32 }
33
34 @Override
35 public boolean doUpdate(Admin vo) throws SQLException {
36 return false;
37 }
38
39 @Override
40 public boolean doRemove(Set<?> ids) throws SQLException {
41 return false;
42 }
43
44 @Override
45 public Admin findById(String id) throws SQLException {
46 Admin vo = null;
47 String sql = "select aid,password,lastdate,flag,status from admin where aid = ?";
48 super.pstmt = super.conn.prepareStatement(sql);
49 super.pstmt.setString(1, id);
50 ResultSet rs = super.pstmt.executeQuery();
51 if(rs.next()){
52 vo = new Admin();
53 vo.setAid(rs.getString("aid"));
54 vo.setFlag(rs.getInt("flag"));
55 vo.setStatus(rs.getInt("status"));
56 vo.setPassword(rs.getString("password"));
57 vo.setLastDate(rs.getTimestamp("lastdate"));
58 }
59 return vo;
60 }
61
62 @Override
63 public List<Admin> findAll() throws SQLException {
64 List<Admin> all = new ArrayList<Admin>();
65 String sql = "select aid,password,lastdate,flag,status from admin";
66 super.pstmt = super.conn.prepareStatement(sql);
67 ResultSet rs = super.pstmt.executeQuery();
68 while(rs.next()){
69 Admin vo = new Admin();
70 vo.setAid(rs.getString("aid"));
71 vo.setPassword(rs.getString("password"));
72 vo.setLastDate(rs.getTimestamp("lastdate"));
73 vo.setFlag(rs.getInt("flag"));
74 vo.setStatus(rs.getInt("status"));
75 all.add(vo);
76 }
77 return all;
78 }
79
80 @Override
81 public List<Admin> findBySplit(String column, String keyWord,
82 Integer currentPage, Integer lineSize) throws SQLException {
83 return null;
84 }
85
86 @Override
87 public Integer getAllCount(String column, String keyWord)
88 throws SQLException {
89 return null;
90 }
91
92 @Override
93 public boolean findLogin(Admin vo) throws Exception {
94 boolean flag = false;
95 String sql = "select lastdate,flag from admin where aid=? and password=? and status=1";
96 super.pstmt = super.conn.prepareStatement(sql);
97 super.pstmt.setString(1, vo.getAid());
98 super.pstmt.setString(2, vo.getPassword());
99 ResultSet rs = super.pstmt.executeQuery();
100 if(rs.next()){
101 flag = true;
102 vo.setLastDate(rs.getTimestamp("lastdate"));//设置lastdate
103 vo.setFlag(rs.getInt("flag"));
104 }
105 return flag;
106 }
107
108 @Override
109 public boolean doUpdateByLastDate(String aid)
110 throws Exception {
111 boolean flag = false;
112 String sql = "update admin set lastdate = ? where aid = ?";
113 super.pstmt = super.conn.prepareStatement(sql);
114 //登陆成功后，使用当前日期为最后一次登陆日期
115 super.pstmt.setTimestamp(1, new Timestamp(new Date().getTime()));
116 super.pstmt.setString(2, aid);
117 int rel = super.pstmt.executeUpdate();
118 if(rel > 0){
119 flag = true;
120 }
121 return flag;
122 }
123
124 }
Service层：
IAdminService（以某个模块为例）
----> ServiceImpl
---> 创建并注册 ServiceFactory
IAdminService
1 package com.shawn.book.service;
2
3 import com.shawn.book.vo.Admin;
4
5 public interface IAdminService {
6
7 /**
8 * 实现管理员登录检查操作，调用IAdminDAO接口中的findLogin方法
9 * @param vo 表示要操作的对象（aid,password）
10 * @return 成功返回true并且将最后一次登陆日期传递到页面，失败返回false
11 * @throws Exception
12 */
13 boolean login(Admin vo) throws Exception;
14
15 /**
16 * 实现增加操作
17 * @param vo
18 * @return
19 * @throws Exception
20 */
21 boolean insert(Admin vo) throws Exception;
22
23 }
AdminServiceImpl
1 package com.shawn.book.service.impl;
2
3 import com.shawn.book.dbc.DatabaseConnection;
4 import com.shawn.book.factory.DAOFactory;
5 import com.shawn.book.service.IAdminService;
6 import com.shawn.book.vo.Admin;
7
8 public class AdminServiceImpl implements IAdminService {
9
10 private DatabaseConnection dbc = new DatabaseConnection();
11
12 @Override
13 public boolean login(Admin vo) throws Exception {
14 try{
15 if(DAOFactory.getIAdminDAOInstance(this.dbc.getConn()).findLogin(vo)){
16 return DAOFactory.getIAdminDAOInstance(this.dbc.getConn()).doUpdateByLastDate(vo.getAid());
17 }
18 return false;
19 } catch(Exception e){
20 throw e;
21 } finally{
22 dbc.close();//最后一定要关闭数据库连接
23 }
24 }
25
26 @Override
27 public boolean insert(Admin vo) throws Exception {
28 try{
29 if(DAOFactory.getIAdminDAOInstance(this.dbc.getConn()).findById(vo.getAid()) == null){
30 DAOFactory.getIAdminDAOInstance(this.dbc.getConn()).doCreate(vo);
31 return true;
32 }
33 } catch(Exception e){
34 throw e;
35 } finally{
36 this.dbc.close();
37 }
38 return false;
39 }
40
41 }
控制层：一个模块一个Servlet
AdminServlet
1 package com.shawn.book.servlet;
2
3 import java.io.IOException;
4
5 import javax.servlet.ServletException;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 import com.shawn.book.factory.ServiceFactory;
11 import com.shawn.book.util.MD5Code;
12 import com.shawn.book.util.ValidateUtils;
13 import com.shawn.book.vo.Admin;
14
15 public class AdminServlet extends HttpServlet{
16
17 private static final long serialVersionUID = -9132124124978042276L;
18
19 @Override
20 public void doGet(HttpServletRequest request, HttpServletResponse response)
21 throws ServletException, IOException {
22
23 String path = "/pages/errors.jsp"; //定义错误页面
24
25 ///pages/back/AdminServlet/login 截取login这个字段
26 String status = request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/")+1);
27
28 if(status != null){
29 if("login".equals(status)){
30 path = this.login(request);
31 } else if("logout".equals(status)){
32 path = this.logout(request);
33 } else if("reg".equals(status)){
34 path = this.reg(request);
35 }
36 }
37
38 request.getRequestDispatcher(path).forward(request, response);
39 }
40
41 public String reg(HttpServletRequest request) {
42 String msg = "";
43 String url = "";
44
45 String aid = request.getParameter("aid");
46 String password = request.getParameter("password");
47 if(ValidateUtils.validateEmpty(aid) &&
48 ValidateUtils.validateEmpty(password)){
49 Admin vo = new Admin();
50 vo.setAid(aid);
51 vo.setFlag(0);
52 vo.setPassword(new MD5Code().getMD5ofStr(vo.getPassword()+vo.getAid()));
53 vo.setStatus(1);//默认激活
54 try {
55 if(ServiceFactory.getIAdminServiceInstance().insert(vo)){
56 msg = "添加管理员成功！";
57 url = "pages/back/admin/admin_insert.jsp";
58 } else {
59 msg = "添加管理员失败，请重新添加！";
60 url = "pages/back/admin/admin_insert.jsp";
61 }
62 } catch (Exception e) {
63 msg = "添加管理员出现异常，请重新添加！";
64 url = "pages/back/admin/admin_insert.jsp";
65 e.printStackTrace();
66 }
67 } else {
68 msg = "数据不能为空！";
69 url = "pages/back/admin/admin_insert.jsp";
70 }
71
72 request.setAttribute("msg", msg);
73 request.setAttribute("url", url);
74 return "/pages/forward.jsp";
75 }
76
77 @Override
78 public void doPost(HttpServletRequest request, HttpServletResponse response)
79 throws ServletException, IOException {
80 this.doGet(request, response);
81 }
82
83 /**
84 * 实现登录
85 * @param request
86 * @return
87 */
88 public String login(HttpServletRequest request){
89 String msg = ""; //表示提示信息
90 String url = ""; //表示跳转路径
91
92 //去的页面中传递过来的数据
93 String aid = request.getParameter("aid");
94 String password = request.getParameter("password");
95
96 //判断数据是否为空
97 if(ValidateUtils.validateEmpty(aid) && ValidateUtils.validateEmpty(password)){//表示数据存在
98 Admin vo = new Admin();
99 vo.setAid(aid); //取得参数
100 vo.setPassword(new MD5Code().getMD5ofStr(password+aid)); //需要加盐处理
101 try {
102 if(ServiceFactory.getIAdminServiceInstance().login(vo)){
103 request.getSession().setAttribute("aid", aid); //保存aid
104 request.getSession().setAttribute("lastdate", vo.getLastDate());
105 request.getSession().setAttribute("flag", vo.getFlag());
106 msg = "登陆成功！";
107 url = "pages/back/index.jsp";
108 } else {
109 msg = "登录失败，错误的ID或密码！";
110 url = "login.jsp";
111 }
112 } catch (Exception e) {
113 e.printStackTrace();
114 }
115 } else {
116 msg = "数据不能为空";
117 url = "login.jsp";
118 }
119 request.setAttribute("msg",msg);
120 request.setAttribute("url",url);
121 return "/pages/forward.jsp";
122 }
123
124 public String logout(HttpServletRequest request) {
125 String msg = "";
126 String url = "";
127
128 request.getSession().invalidate();//表示session失效
129 msg = "已经成功退出系统，请重新登录！";
130 url = "login.jsp";
131
132 request.setAttribute("msg", msg);
133 request.setAttribute("url", url);
134 return "/pages/forward.jsp";
135 }
136
137 }
添加功能：先写dao方法 ---> service 方法 ---> 控制层逻辑；可以先把页面写好，有利于理清思路。
后台大致就是这种开发流程，因人而异。
有用的MD5加密类：
MD5Code
1 MD5Code
用法：
package com.shawn.util;
import com.shawn.book.util.MD5Code;
public class MD5CodeTest {
public static void main(String[] args) {
System.out.println(new MD5Code().getMD5ofStr("admin123admin"));
}
}
页面分页小脚本：
split_bar.jsp
1 <%@ page pageEncoding="UTF-8"%>
2 <link rel="stylesheet" type="text/css" href="mldn.css">
3 <%--
4 <div id="splitBarDiv" style="float:right">
5 <jsp:include page="/pages/split_page_plugin_bars.jsp"/>
6 </div>
7 --%>
8 <%
9 String path = request.getContextPath();
10 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
11 %>
12 <%
13 String url = null ;
14 int currentPage = 1 ;
15 int lineSize = 5 ;
16 String column = null ;
17 String keyWord = null ;
18 int allRecorders = 0 ;
19 int pageSize = 0 ;
20 int lsData [] = new int [] {1,5,10,15,20,30,50,100} ;
21 int seed = 3 ; // 种子数
22 String paramName = request.getParameter("paramName") ;
23 String paramValue = request.getParameter("paramValue") ;
24 %>
25
26 <% // 接收传递的参数
27 try {
28 currentPage = (Integer) request.getAttribute("currentPage") ;
29 } catch (Exception e) {}
30 try {
31 allRecorders = (Integer)request.getAttribute("allRecorders") ;
32 } catch (Exception e) {}
33 try {
34 lineSize = (Integer) request.getAttribute("lineSize") ;
35 } catch (Exception e) {}
36 column = (String) request.getAttribute("column") ;
37 keyWord = (String) request.getAttribute("keyWord") ;
38 url = basePath + request.getAttribute("url") ;
39 %>
40 <%
41 if (allRecorders > 0) {
42 pageSize = (allRecorders + lineSize - 1) / lineSize ;
43 } else { // 没有记录
44 pageSize = 1 ;
45 }
46 %>
47
48 <script type="text/javascript">
49 function goSplit(vcp) { // 根据外部传递的cp内容进行操作
50 try {
51 var eleKw = document.getElementById("kw").value ;
52 var eleCol = document.getElementById("colSel").value ;
53 window.location = "<%=url%>?cp=" + vcp + "&ls=" + <%=lineSize%> + "&kw=" + eleKw + "&col=" + eleCol + "&<%=paramName%>=<%=paramValue%>" ;
54 } catch (Exception) {
55 window.location = "<%=url%>?cp=" + vcp + "&ls=" + <%=lineSize%> + "&<%=paramName%>=<%=paramValue%>" ;
56 }
57 }
58 </script>
59 <ul class="pagination">
60 <%
61 if (pageSize > seed * 3) {
62 %>
63 <li class="<%=currentPage == 1?"active":""%>"><a onclick="goSplit(1)">1</a></li>
64
65 <%
66 if (currentPage > seed * 2) {
67 %>
68 <li class="disabled"><span>...</span></li>
69 <%
70 int startPage = currentPage - seed ;
71 int endPage = currentPage + seed ;
72 for (int x = startPage ; x <= endPage ; x ++) {
73 if(x < pageSize) {
74 %>
75 <li class="<%=currentPage == x?"active":""%>"><a onclick="goSplit(<%=x%>)"><%=x%></a></li>
76 <%
77 }
78 }
79 if ((currentPage + seed * 2) <= pageSize) {
80 %>
81 <li class="disabled"><span>...</span></li>
82 <%
83 }
84 } else { // 还在6页以前
85 for (int x = 2 ; x <= currentPage + seed ; x ++) {
86 %>
87 <li class="<%=currentPage == x?"active":""%>"><a onclick="goSplit(<%=x%>)"><%=x%></a></li>
88 <%
89 }
90 if ((currentPage + seed * 2) <= pageSize) {
91 %>
92 <li class="disabled"><span>...</span></li>
93 <%
94 }
95 }
96 %>
97 <li class="<%=currentPage == pageSize?"active":""%>"><a onclick="goSplit(<%=pageSize%>)"><%=pageSize%></a></li>
98 <%
99 } else {
100 for (int x = 1 ; x <= pageSize ; x ++) {
101 %>
102 <li class="<%=currentPage == x?"active":""%>"><a onclick="goSplit(<%=x%>)"><%=x%></a></li>
103 <%
104 }
105 }
106 %>
107 </ul>
用法举例：
servlet层：
1 Integer currentPage = 1; //当前页
2 Integer lineSize = 5; //每页显示行数
3 try{
4 currentPage = Integer.parseInt(request.getParameter("cp") == null ? "1" : request.getParameter("cp")); //当前页参数
5 lineSize = Integer.parseInt(request.getParameter("ls") == null ? "5" : request.getParameter("ls")); //每页显示行数
6 } catch(Exception e){
7 e.printStackTrace();
8 }
9 String keyWord = request.getParameter("kw"); //查询关键字
10 String column = request.getParameter("col"); //查询字段
11 if(keyWord == null){
12 keyWord = "";
13 }
14 if(column == null){
15 column = "name";
16 }
17
18 try {
19 Map<String,Object> map =
20 ServiceFactory.getIBookServiceInstance().listBySplit(column, keyWord, currentPage, lineSize);
21 request.setAttribute("allBook", map.get("allBook"));
22 request.setAttribute("allRecorders", map.get("allRecord"));
23 } catch (Exception e) {
24 e.printStackTrace();
25 }
26
27 request.setAttribute("url", "pages/back/book/BookServlet/listSplit");
28 request.setAttribute("currentPage", currentPage);
29 request.setAttribute("lineSize", lineSize);
30 request.setAttribute("currentPage", currentPage);
31 request.setAttribute("keyWord", keyWord);
32
33 return "/pages/back/book/book_list.jsp";
34
service 层：
1 @Override
2 public Map<String, Object> listBySplit(String column, String keyWord,
3 int currentPage, int lineSize) throws Exception {
4 Map<String, Object> map = null;
5 try{
6 map = new HashMap<String, Object>();
7 map.put("allBook", DAOFactory.getIBookDAOInstance(this.dbc.getConn()).findBySplit(column, keyWord, currentPage, lineSize));
8 map.put("allRecord", DAOFactory.getIBookDAOInstance(this.dbc.getConn()).getAllCount(column, keyWord));
9 } catch(Exception e){
10 throw e;
11 } finally{
12 this.dbc.close();
13 }
14 return map;
15 }
dao 层：
1 @Override
2 public List<Book> findBySplit(String column, String keyWord,
3 Integer currentPage, Integer lineSize) throws SQLException {
4 List<Book> all = new ArrayList<Book>();
5 String sql = "select * from "
6 + "(select b.bid,b.name,i.name iname,b.aid,b.credate,b.status,b.note "
7 + "from books b,admin a,item i where b.iid = i.iid and b.aid = a.aid and b."+column+" like ?) t"
8 + " order by t.bid limit ?,?";
9 super.pstmt = super.conn.prepareStatement(sql);
10 super.pstmt.setString(1, "%" + keyWord + "%");
11 super.pstmt.setInt(2, (currentPage - 1)*lineSize);
12 super.pstmt.setInt(3, lineSize);
13 ResultSet rs = super.pstmt.executeQuery();
14 while(rs.next()){
15 Book vo = new Book();
16 vo.setBid(rs.getInt("bid"));
17 vo.setCredate(rs.getTimestamp("credate"));
18 vo.setName(rs.getString("name"));
19 vo.setNote(rs.getString("note"));
20 vo.setStatus(rs.getInt("status"));
21 Item item = new Item();
22 item.setName(rs.getString("iname"));
23 vo.setItem(item);
24 Admin admin = new Admin();
25 admin.setAid(rs.getString("aid"));
26 vo.setAdmin(admin);
27 all.add(vo);
28 }
29 return all;
30 }
31
32 @Override
33 public Integer getAllCount(String column, String keyWord)
34 throws SQLException {
35 String sql = "select count(name) num from books where " + column + " like ?";
36 super.pstmt = super.conn.prepareStatement(sql);
37 super.pstmt.setString(1, "%" + keyWord + "%");
38 ResultSet rs = super.pstmt.executeQuery();
39 if(rs.next()){
40 int rel = rs.getInt("num");
41 return rel;
42 }
43 return 0;
44 }
项目最终效果：
登录页面：
首页大体效果：
代码链接: https://pan.baidu.com/s/1eRWhAb4 密码: u5m9
时间： 2024-10-19 07:26:05