1.导入分页插件

<dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper-spring-boot-starter</artifactId>
   <version>1.2.13</version>
</dependency>

2.mapper接口

List<Category> selectList();

3.xml

<select id="selectList" resultMap="BaseResultMap">
  select
  <include refid="Base_Column_List"/>
  from imooc_mall_category

</select>

4.service

PageInfo listForAdmin(Integer pageNum, Integer pageSize);

5.实现类

@Override
public PageInfo listForAdmin(Integer pageNum,Integer pageSize){
  PageHelper.startPage(pageNum,pageSize,"type,order_num");
  List<Category> categoryList = categoryMapper.selectList();
  PageInfo pageInfo = new PageInfo(categoryList);
  return pageInfo;
}

6.controller

 /*
  * 后台目录列表
  * */
 @ApiOperation("后台目录列表")
 @PostMapping("admin/category/list")
 @ResponseBody
 public ApiRestResponse listCategoryForAdmin(@RequestParam Integer pageNum,
                                             @RequestParam Integer pageSize){
     PageInfo pageInfo = categoryService.listForAdmin(pageNum, pageSize);
return ApiRestResponse.success(pageInfo);
 }

测试！！！

{

"status": 10000,

"msg": "SUCCESS",

"data": {

"total": 19,

"list": [

{

"id": 3,

"name": "新鲜水果",

"type": 1,

"parentId": 0,

"orderNum": 1,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T09:11:26.000+0000"

},

{

"id": 5,

"name": "海鲜水产",

"type": 1,

"parentId": 0,

"orderNum": 2,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:20.000+0000"

},

{

"id": 6,

"name": "精选肉类",

"type": 1,

"parentId": 0,

"orderNum": 3,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:21.000+0000"

},

{

"id": 9,

"name": "冷饮冻食",

"type": 1,

"parentId": 0,

"orderNum": 4,

"createTime": "2019-12-20T05:45:28.000+0000",

"updateTime": "2019-12-28T08:25:22.000+0000"

},

{

"id": 10,

"name": "蔬菜蛋品",

"type": 1,

"parentId": 0,

"orderNum": 5,

"createTime": "2019-12-20T05:45:28.000+0000",

"updateTime": "2019-12-28T08:25:23.000+0000"

},

{

"id": 27,

"name": "美味菌菇",

"type": 1,

"parentId": 0,

"orderNum": 7,

"createTime": "2019-12-20T05:45:28.000+0000",

"updateTime": "2020-02-10T15:20:36.000+0000"

},

{

"id": 4,

"name": "橘子橙子",

"type": 2,

"parentId": 3,

"orderNum": 1,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:10.000+0000"

},

{

"id": 7,

"name": "螃蟹",

"type": 2,

"parentId": 5,

"orderNum": 1,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:15.000+0000"

},

{

"id": 17,

"name": "冰淇淋",

"type": 2,

"parentId": 9,

"orderNum": 1,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:18.000+0000"

},

{

"id": 16,

"name": "牛羊肉",

"type": 2,

"parentId": 6,

"orderNum": 1,

"createTime": "2019-12-17T17:17:00.000+0000",

"updateTime": "2019-12-28T08:25:18.000+0000"

}

],

"pageNum": 1,

"pageSize": 10,

"size": 10,

"startRow": 1,

"endRow": 10,

"pages": 2,

"prePage": 0,

"nextPage": 2,

"isFirstPage": true,

"isLastPage": false,

"hasPreviousPage": false,

"hasNextPage": true,

"navigatePages": 8,

"navigatepageNums": [

1,

2

],

"navigateFirstPage": 1,

"navigateLastPage": 2,

"lastPage": 2,

"firstPage": 1

}

}

json格式化解析后

"status":10000, "msg":"SUCCESS", "data":{ "total":19, "list":Array[10], "pageNum":1, "pageSize":10, "size":10, "startRow":1, "endRow":10, "pages":2, "prePage":0, "nextPage":2, "isFirstPage":true, "isLastPage":false, "hasPreviousPage":false, "hasNextPage":true, "navigatePages":8, "navigatepageNums":[ 1, 2 ], "navigateFirstPage":1, "navigateLastPage":2, "lastPage":2, "firstPage":1 } }