springboot分页

1、引入分页的依赖

    com.github.pagehelper
    pagehelper
    4.1.0

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 listByPage();

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


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

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

        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 * from user