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1. pom.xml

注意当前使用的mybatis plus的版本，版本过高会需要额外引入jsqlparser包，才有PaginationInnerInterceptor类。

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.10</version>
</dependency>
<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-jsqlparser</artifactId><version>3.5.10</version> <!-- 确保版本和 MyBatis Plus 主包一致 -->
</dependency>

2. 配置类

package com.whl.info.config;import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class MybatisPlusConfig {@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();// 添加分页插件interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL)); // 数据库类型return interceptor;}}

注意，config类如果是在别的模块下，需要在该服务下的主启动类中配置能扫描到config类的路径名@ComponentScan(basePackages = {"com.example.a","com.example.a"})
比如，模块目录如下：

- module-a- src- main- java- com- example- a- MyBatisConfig.java
- module-b- src- main- java- com- example- b- ApplicationB.java

那么在模块B中的主启动类ApplicationB.java示例如下：

@SpringBootApplication
@ComponentScan(basePackages = {"com.example.a", "com.example.b"})
public class ApplicationB {public static void main(String[] args) {SpringApplication.run(ApplicationB.class, args);}
}

或者直接将config放在B模块目录下，但是如果其他模块也有分页操作，需要写重复的代码，不便于维护，最好是将config都放在同一个模块下，别的模块在依赖中引用即可。
如，在 B 模块的 pom.xml 中添加对 A 模块的依赖：

<dependency><groupId>com.example</groupId><artifactId>module-a</artifactId><version>1.0.0</version>
</dependency>

3. 业务代码

只需要给定pageNum（分页当前页）和pageSize（总页数）即可。

1. controller层：

   package com.whl.info.controller;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
   import com.whl.entity.result.Result;
   import com.whl.info.entity.dto.ArticleDto;
   import com.whl.info.entity.dto.ArticlePageDto;
   import com.whl.info.entity.vo.ArticleVo;
   import com.whl.info.service.ArticleService;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
   @RequestMapping("/article/")
   public class ArticleController {@Autowiredprivate ArticleService articleService;/*** 分页查询文章列表* @param articlePageDto* @return*/@PostMapping("articleListPage")public Result<Page<ArticleVo>> getArticleListByPage(@RequestBody ArticlePageDto articlePageDto){Page<ArticleVo> articleVoPage = articleService.getArticleListByPage(articlePageDto);return Result.success(articleVoPage);}
   }
   

2. service层：

   public interface ArticleService {Page<ArticleVo> getArticleListByPage(ArticlePageDto articlePageDto);
   }

   package com.whl.info.service.impl;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
   import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
   import com.baomidou.mybatisplus.core.metadata.IPage;
   import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
   import com.mysql.cj.util.StringUtils;
   import com.whl.info.entity.dto.ArticleDto;
   import com.whl.info.entity.dto.ArticlePageDto;
   import com.whl.info.entity.vo.ArticleVo;
   import com.whl.info.mapper.ArticleMapper;
   import com.whl.info.service.ArticleService;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Service;import java.util.List;@Service
   public class ArticleServiceImpl implements ArticleService {@Autowiredprivate ArticleMapper articleMapper;@Overridepublic Page<ArticleVo> getArticleListByPage(ArticlePageDto articlePageDto) {//1. 分页对象Page<ArticleVo> articleVoPage = new Page<>(articlePageDto.getPageNum(), articlePageDto.getPageSize());//2. 查询条件LambdaQueryWrapper<ArticleVo> queryWrapper = new LambdaQueryWrapper<>();//校验入参，条件查询if (!StringUtils.isNullOrEmpty(articlePageDto.getArticleName())){queryWrapper.like(ArticleVo::getArticleTitle, articlePageDto.getArticleName());}if (!StringUtils.isNullOrEmpty(articlePageDto.getStartTime()) && !StringUtils.isNullOrEmpty(articlePageDto.getEndTime())){queryWrapper.between(ArticleVo::getPublishTime,articlePageDto.getStartTime(), articlePageDto.getEndTime());}else if (!StringUtils.isNullOrEmpty(articlePageDto.getStartTime())){queryWrapper.ge(ArticleVo::getPublishTime, articlePageDto.getStartTime());}else if (!StringUtils.isNullOrEmpty(articlePageDto.getEndTime())){queryWrapper.le(ArticleVo::getPublishTime, articlePageDto.getEndTime());}if (articlePageDto.getArticleCategory() != null){queryWrapper.eq(ArticleVo::getArticleCategory, articlePageDto.getArticleCategory());}//3. 执行查询Page<ArticleVo> voPage = articleMapper.selectPage(articleVoPage, queryWrapper);return voPage;}
   }
   

3. mapper层：

   @Mapper
   public interface ArticleMapper extends BaseMapper<ArticleVo> {
   }
   

   <?xml version="1.0" encoding="UTF-8" ?>
   <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
   <mapper namespace="com.whl.info.mapper.ArticleMapper"></mapper>
   

4. 实体类

1. dto代表传参

   package com.whl.info.entity.dto;import com.whl.entity.page.PageVo;
   import lombok.AllArgsConstructor;
   import lombok.Data;
   import lombok.NoArgsConstructor;@Data
   @AllArgsConstructor
   @NoArgsConstructor
   public class ArticlePageDto {/*** 文章名称*/private String articleName;/*** 开始时间*/private String startTime;/*** 结束时间*/private String endTime;/*** 文章类型*/private Integer articleCategory;/*** 当前页*/private Integer pageNum;/*** 每页大小*/private Integer pageSize;
   }
   

2. vo代表回参

   package com.whl.info.entity.vo;import com.baomidou.mybatisplus.annotation.IdType;
   import com.baomidou.mybatisplus.annotation.TableField;
   import com.baomidou.mybatisplus.annotation.TableId;
   import com.baomidou.mybatisplus.annotation.TableName;
   import lombok.AllArgsConstructor;
   import lombok.Data;
   import lombok.NoArgsConstructor;@Data
   @AllArgsConstructor
   @NoArgsConstructor
   @TableName("article_info")
   public class ArticleVo {/*** 主键自增*/@TableId(type = IdType.AUTO)private Integer id;/*** 文章封面*/@TableField("article_pic_url")private String articlePicUrl;/*** 文章标题*/@TableField("article_title")private String articleTitle;/*** 文章分类*/@TableField("article_category")private Integer articleCategory;/*** 发布时间*/@TableField("publish_time")private String publishTime;/*** 置顶*/@TableField("on_head")private Integer onHead;/*** 创建时间*/@TableField("create_time")private String createTime;/*** 是否删除*/@TableField("is_delete")private Integer isDelete;
   }
   

总结

1. 引入依赖，注意版本问题
2. 写好config配置类，注意扫描配置类的路径配置
3. 传参pageNum和pageSize给定

以上为个人学习分享，如有问题，欢迎指出：）