Mybatis-PageHelper插件实现分页
（一）使用PageHelper分页插件的基本配置
参考：MyBatis 分页插件 PageHelper
参考 : PageHelper作者博客文章学习
1.在 pom.xml中引入依赖Jar包
<dependency>
<groupId>com.github.pagehelpergroupId>
<artifactId>pagehelperartifactId>
<version>5.0.0version>
dependency>2.在mybatis-config.xml中配置PageInterceptor拦截器
<plugins>
<plugin interceptor="com.github.pagehelper.PageInterceptor">
<property name="reasonable" value="true"/>
plugin>
plugins>3.EmployeeControlller.java服务端程序
@Controller
public class EmployeeControlller {
@Autowired
EmployeeService employeeService;
@RequestMapping("/emps")
public String getEmps(@RequestParam(value="pn",defaultValue="1")Integer pn,Model model) {
//1.使用PageHelper分页插件,在查询之前只需传入页码及每页显示的数据记录参数即可！
PageHelper.startPage(pn, 5);
//2.startPage后紧跟的就是一个分页查询
List emps=employeeService.getAll();
//3.使用PageInfo封装查询结果，只需将PageInfo交给页面即可
//4.PageInfo封装分页的详细信息
//5. PageInfo构造器的5表示连续显示的页码数字
PageInfo page=new PageInfo(emps,5);
model.addAttribute("pageInfo", page);
return "list";
}
}
4.使用Spring-Test测试模块：模拟浏览器向服务器发送请求
package com.wang.ssm.test;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
import com.github.pagehelper.PageInfo;
import com.wang.ssm.bean.Employee;
/*
* spring4的测试需要servlet-api 3.0以上版本
*/
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
//引入spring-bean.xml，springmvc.xml文件
@ContextConfiguration(locations={"classpath:spring-bean.xml","classpath:springmvc.xml"})
public class SpringMVCTest {
@Autowired
WebApplicationContext context;
MockMvc mvc; //虚拟springmvc
@Before
public void initMockMvc(){
//首先初始化
mvc=MockMvcBuilders.webAppContextSetup(context).build();
}
@Test
public void page() throws Exception{
//1.MockMvcRequestBuilders模拟浏览器向服务器发送请求
MvcResult result=mvc.perform(MockMvcRequestBuilders.get("/emps").param("pn", "1")).andReturn();
//2.服务器端返回给浏览器的数据
MockHttpServletRequest request=result.getRequest();
@SuppressWarnings("unchecked")
//3.获取pageInfo封装的数据
PageInfo info=(PageInfo) request.getAttribute("pageInfo");
//4.info调用以下数据可以获取分页信息
System.out.println("当前页码="+info.getPageNum());
System.out.println("总页码="+info.getPages());
System.out.println("每页的个数="+info.getSize());
System.out.println("总记录数="+info.getTotal());
System.out.println("连续显示的页码数字");
int[]pages=info.getNavigatepageNums();
for(int i:pages) {
System.out.print(i+",");
}
System.out.println("显示当前页码所显示的员工数据：");
List list=info.getList();
for(Employee e:list){
System.out.println(e);
}
}
}
（二）PageHelp实现前台分页功能
项目结构：
注：下载项目源码
1.前端实现分页源码（后台源码在上面以展示）
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>员工列表title>
<%
pageContext.setAttribute("path", request.getContextPath());
%>
<link rel="stylesheet"
href="${path}/static/bootstrap-3.3.7-dist/css/bootstrap.min.css">
<script type="text/javascript"
src="${path }/static/bootstrap-3.3.7-dist/js/bootstrap.min.js">script>
<script type="text/javascript"
src="${path }/static/js/jquery-1.12.4.min.js">script>
head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h1>SSM演示h1>
div>
div>
<div class="row">
<div class="col-md-4 col-md-offset-0">
<button class="btn btn-primary">增加button>
<button class="btn btn-warning">删除button>
div>
div>
<div class="row">
<div class="col-md-12">
<table class="table table-hover" border="2">
<tr>
<th>编号th>
<th>姓名th>
<th>性别th>
<th>邮箱th>
<th>所属部门th>
<th>操作th>
tr>
<c:forEach items="${pageInfo.list }" var="emp">
<tr>
<td>${emp.empId }td>
<td>${emp.empName }td>
<td>${emp.gender=="M"?"男":"女" }td>
<td>${emp.email }td>
<td>${emp.department.deptName }td>
<td>
<button class="btn btn-primary btn-sm">
<span class="glyphicon glyphicon-pencil" aria-hidden="true">span>
增加
button>
<button class="btn btn-warning btn-sm">
<span class="glyphicon glyphicon-trash" aria-hidden="true">span>
删除
button>
td>
tr>
c:forEach>
table>
div>
div>
<div class="row">
<div class="col-md-6">
当前${pageInfo.pageNum }页，总共${pageInfo.pages }页，总共${pageInfo.total }条记录
div>
<div class="col-md-6">
<nav aria-label="Page navigation">
<ul class="pagination">
<li><a href="${path }/emps?pn=1">首页a>li>
<c:if test="${pageInfo.hasPreviousPage }">
<li>
<a href="${path }/emps?pn=${pageInfo.pageNum-1}" aria-label="Previous">
<span aria-hidden="true">«span>
a>
li>
c:if>
<c:forEach items="${pageInfo.navigatepageNums }" var="page">
<c:if test="${page==pageInfo.pageNum }">
<li class="active"><a href="${path }/emps?pn=${page}">${page}a>li>
c:if>
<c:if test="${page!=pageInfo.pageNum }">
<li><a href="${path }/emps?pn=${page}">${page}a>li>
c:if>
c:forEach>
<c:if test="${pageInfo.hasNextPage }">
<li>
<a href="${path }/emps?pn=${pageInfo.pageNum+1 }" aria-label="Next">
<span aria-hidden="true">»span>
a>
li>
c:if>
<li><a href="${path }/emps?pn=${pageInfo.pages}">末页a>li>
ul>
nav>
div>
div>
div>
body>
html>