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前言：使用mybatis整合时，最容易遇到的需求就是分页了，pagehelper 分页插件是一个非常实用的
MyBatis分页插件，可以快速的实现MyBatis分页功能，而且pagehelper有个优点就是分页和Mapper.xml完全解耦，并以插件的形式实现，有效的避免了直接写分页SQL语句来实现分页功能
分页插件原理：分页插件的基本原理是使用Mybatis提供的插件接口，实现自定义插件，在插件的拦截方法内拦截待执行的sql，然后重写sql，添加对应的物理分页语句和物理分页参数
举例：select * from student，拦截sql后重写为：select t.* from （select * from student）t
limit 0，10
<>1.引入pagehelper依赖
<dependency> <groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId> <version>5.1.11</version> </dependency>
<>2.配置拦截器
这个是配置在mybatis-config.xml文件中
<plugins> <plugin interceptor="com.github.pagehelper.PageInterceptor">
<property name="param1" value="value1"/> </plugin> </plugins>
<>3.在代码中的使用
@RequestMapping("/emps") public String list(@RequestParam(required =
false,defaultValue = "1",value = "pn")Integer pn, Map<String,Object> map){
//引入分页查询，使用PageHelper分页功能 //在查询之前传入当前页，然后多少记录 PageHelper.startPage(pn,5);
//startPage后紧跟的这个查询就是分页查询 List<Employee> emps = employeeService.getAll();
//使用PageInfo包装查询结果，只需要将pageInfo交给页面就可以 PageInfo pageInfo = new
PageInfo<>(emps,5); //pageINfo封装了分页的详细信息，也可以指定连续显示的页数
map.put("pageInfo",pageInfo); return "list"; }
