Spring boot集成mybatis-plus以及分页插件

环境：

Springboot：2.1.1.RELEASE

Mybatis-plus：2.2.0

依赖：

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatisplus.version}</version>
        </dependency>

application.yml内关于plus的配置（参考）

mybatis-plus:
  mapper-locations: classpath:mapper/*Mapper.xml
  typeAliasesPackage: com.springboot.demo.entity
  global-config:
    id-type: 0
    field-strategy: 0
    db-column-underline: true
    refresh-mapper: true
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: true

编写配置类

package com.springboot.demo.config;

import com.baomidou.