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：

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper
 PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
 <mapper namespace="ec.help.dao.UserDao">

     <resultMap type="ec.help.bean.User" id="userResult" >
             <id column="id" javaType="string" />
             <result column="username" javaType="string" />
             <result column="password" javaType="string" />
     </resultMap>

     <sql id="userColumn"> id, username, password</sql>

     <select id="getUser" parameterType="map" resultType="ec.help.bean.User" >
         select  * from User where username=#{0} and password=#{1}
     </select>

     <select id="getAllUser"  parameterType="map" resultType="ec.help.bean.User" >
         select  * from User
     </select>

     <!-- 分页使用SQL -->
     <select id="getUserByPage"  resultType="ec.help.bean.User" >
         select * from user limit #{0},#{1}
     </select>

     <insert id="addUser" parameterType="ec.help.bean.User">
         insert into User(id,username,password) values(#{id},#{username},#{password})
     </insert>

     <delete id="deleteUser" parameterType="String">
         delete from User where id=#{id}
     </delete>

     <select id="showUser" parameterType="String" resultType="ec.help.bean.User" >
         select  * from User where id=#{id}
     </select>

     <update id="updateUser" parameterType="map">
         update User set username=#{0},password=#{1} where id=#{2}
     </update>
 </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：

 @Value("#{configProperties['userPageSize']}")
     private String userPageSize; 

     @RequestMapping("/listUser.do")
     public ModelAndView listUser(String page,Model model){    

         //每页显示的条数
         int pageSize = Integer.parseInt(userPageSize);

         List<User> users = new ArrayList<User>();
         users = this.userService.getAllUser();

         //查到的总用户数
         model.addAttribute("userNum", users.size());

         //总页数
         int pageTimes;
         if(users.size()%pageSize == 0)
         {
             pageTimes = users.size()/pageSize;
         }else
         {
             pageTimes = users.size()/pageSize + 1;
         }
         model.addAttribute("pageTimes", pageTimes);

         //页面初始的时候page没有值
         if(null == page)
         {
             page = "1";
         }

         //每页开始的第几条记录
         int startRow = (Integer.parseInt(page)-1) * pageSize;
         users = this.userService.getUserByPage(startRow, pageSize);

         model.addAttribute("currentPage", Integer.parseInt(page));
         model.addAttribute("users", users);

         return new ModelAndView("user/listUser");
     }

三、分页页面文件：

 <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 <div class="pagging">
         <div class="left">共${userNum}条记录</div>
         <div class="right">
         <c:if test="${currentPage == 1}">
             <span class="disabled"><< 前一页</span>
         </c:if>
         <c:if test="${currentPage != 1}">
             <a href="listUser.do?page=${currentPage-1}"><< 前一页</a>
         </c:if>
         <c:if test="${currentPage == 1}">
         <span class="current">1</span>
         </c:if>
         <c:if test="${currentPage != 1}">
         <a href="listUser.do?page=1">1</a>
         </c:if>
         <%
                 int pageTimes = (Integer)session.getAttribute("pageTimes");
                 for(int i=1;i<pageTimes;i++)
                 {
                     request.setAttribute("page", i+1);
         %>
         <c:if test="${currentPage == page}">
             <span class="current"><%=i+1%></span>
         </c:if>
         <c:if test="${currentPage != page}">
              <a href="listUser.do?page=<%=i+1%>"><%=i+1%></a>
         </c:if>
         <%} %>

         <c:if test="${currentPage == pageTimes}">
             <span class="disabled">后一页 >></span>
         </c:if>
         <c:if test="${currentPage != pageTimes}">
         <a href="listUser.do?page=${currentPage+1}">后一页 >></a>
         </c:if>
         </div>
 </div> 

四、实现效果：