springboot分页

1、引入分页的依赖

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>4.1.0</version>
</dependency>

2、在启动类中加入配置

 //配置mybatis的分页插件pageHelper
    @Bean
    public PageHelper pageHelper(){
        PageHelper pageHelper = new PageHelper();
        Properties properties = new Properties();
        properties.setProperty("offsetAsPageNum","true");
        properties.setProperty("rowBoundsWithCount","true");
        properties.setProperty("reasonable","true");
        properties.setProperty("dialect","mysql");    //配置mysql数据库的方言
        pageHelper.setProperties(properties);
        return pageHelper;
    }

3、在application.properties中添加

#分页
pagehelper.helper-dialect: mysql
pagehelper.reasonable: true
pagehelper.support-methods-arguments: true
pagehelper.params: count=countSql

4、dao service serviceImpl controller层分别为（PageInfo是插件的）

// dao
 List<User> listByPage();

// service
 PageInfo listByPage(Integer pageNumber, Integer pageSize);


// serviceImpl
@Override
    public PageInfo listByPage(Integer pageNumber, Integer pageSize) {
        PageHelper.startPage(pageNumber, pageSize);
        List<User> list = userMapper.listByPage();
        PageInfo pageInfo = new PageInfo(list);
        return pageInfo;
    }

// controller
@RequestMapping("/listByPage")
    public Map<String,Object> listByPage(Integer pageNumber, Integer pageSize){
        Map<String, Object> res = new HashMap<String, Object>();

        PageInfo pageInfo = userServiceImpl.listByPage(pageNumber, pageSize);
        res.put("list", pageInfo.getList());
        res.put("code","200");
        res.put("msg","操作成功");

        return res;
    }

// mapper.xml中
 <select id="listByPage" resultType="User">
      select * from user
 </select>

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