Spring MVC 关于分页的简单实现

据本人了解，目前较常用的分页实现办法有两种：

　 1.每次翻页都修改SQL，向SQL传入相关参数去数据库实时查出该页的数据并显示。

　 2.查出数据库某张表的全部数据，再通过在业务逻辑里面进行处理去取得某些数据并显示。

　 对于数据量并不大的简单的管理系统而言，第一种实现方法相对来说容易使用较少的代码实现分页这一功能，本文也正是为大家介绍这种方法:

　一、MyBatis数据表配置文件：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper
 3 PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
 4 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
 5 <mapper namespace="ec.help.dao.UserDao">
 6
 7     <resultMap type="ec.help.bean.User" id="userResult" >
 8             <id column="id" javaType="string" />
 9             <result column="username" javaType="string" />
10             <result column="password" javaType="string" />
11     </resultMap>
12
13     <sql id="userColumn"> id, username, password</sql>
14
15     <select id="getUser" parameterType="map" resultType="ec.help.bean.User" >
16         select  * from User where username=#{0} and password=#{1}
17     </select>
18
19     <select id="getAllUser"  parameterType="map" resultType="ec.help.bean.User" >
20         select  * from User
21     </select>
22
23     <!-- 分页使用SQL -->
24     <select id="getUserByPage"  resultType="ec.help.bean.User" >
25         select * from user limit #{0},#{1}
26     </select>
27
28     <insert id="addUser" parameterType="ec.help.bean.User">
29         insert into User(id,username,password) values(#{id},#{username},#{password})
30     </insert>
31
32
33     <delete id="deleteUser" parameterType="String">
34         delete from User where id=#{id}
35     </delete>
36
37     <select id="showUser" parameterType="String" resultType="ec.help.bean.User" >
38         select  * from User where id=#{id}
39     </select>
40
41     <update id="updateUser" parameterType="map">
42         update User set username=#{0},password=#{1} where id=#{2}
43     </update>
44 </mapper>

SQL中传入的第一个参数为开始的行数，第二个参数为数据条数。

二、Controller中逻辑实现：

 1 @Value("#{configProperties[‘userPageSize‘]}")
 2     private String userPageSize;
 3
 4     @RequestMapping("/listUser.do")
 5     public ModelAndView listUser(String page,Model model){
 6
 7         //每页显示的条数
 8         int pageSize = Integer.parseInt(userPageSize);
 9
10         List<User> users = new ArrayList<User>();
11         users = this.userService.getAllUser();
12
13         //查到的总用户数
14         model.addAttribute("userNum", users.size());
15
16         //总页数
17         int pageTimes;
18         if(users.size()%pageSize == 0)
19         {
20             pageTimes = users.size()/pageSize;
21         }else
22         {
23             pageTimes = users.size()/pageSize + 1;
24         }
25         model.addAttribute("pageTimes", pageTimes);
26
27         //页面初始的时候page没有值
28         if(null == page)
29         {
30             page = "1";
31         }
32
33         //每页开始的第几条记录
34         int startRow = (Integer.parseInt(page)-1) * pageSize;
35         users = this.userService.getUserByPage(startRow, pageSize);
36
37         model.addAttribute("currentPage", Integer.parseInt(page));
38         model.addAttribute("users", users);
39
40         return new ModelAndView("user/listUser");
41     }

三、分页页面文件：

 1 <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 3 <div class="pagging">
 4         <div class="left">共${userNum}条记录</div>
 5         <div class="right">
 6         <c:if test="${currentPage == 1}">
 7             <span class="disabled"><< 前一页</span>
 8         </c:if>
 9         <c:if test="${currentPage != 1}">
10             <a href="listUser.do?page=${currentPage-1}"><< 前一页</a>
11         </c:if>
12         <c:if test="${currentPage == 1}">
13         <span class="current">1</span>
14         </c:if>
15         <c:if test="${currentPage != 1}">
16         <a href="listUser.do?page=1">1</a>
17         </c:if>
18         <%
19                 int pageTimes = (Integer)session.getAttribute("pageTimes");
20                 for(int i=1;i<pageTimes;i++)
21                 {
22                     request.setAttribute("page", i+1);
23         %>
24         <c:if test="${currentPage == page}">
25             <span class="current"><%=i+1%></span>
26         </c:if>
27         <c:if test="${currentPage != page}">
28              <a href="listUser.do?page=<%=i+1%>"><%=i+1%></a>
29         </c:if>
30         <%} %>
31
32         <c:if test="${currentPage == pageTimes}">
33             <span class="disabled">后一页 >></span>
34         </c:if>
35         <c:if test="${currentPage != pageTimes}">
36         <a href="listUser.do?page=${currentPage+1}">后一页 >></a>
37         </c:if>
38         </div>
39 </div> 

四、实现效果：