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1、安装依赖

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId><version>3.5.3.2</version></dependency>

版本与mybatis-plus一致
2、编写sql注入器

package com.example.answer_system.config;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.core.metadata.TableInfo;
import com.baomidou.mybatisplus.extension.injector.methods.InsertBatchSomeColumn;import java.util.List;public class EasySqlInjector extends DefaultSqlInjector {@Overridepublic List<AbstractMethod> getMethodList(Class<?> mapperClass, TableInfo tableInfo) {// 注意：此SQL注入器继承了DefaultSqlInjector(默认注入器)，调用了DefaultSqlInjector的getMethodList方法，保留了mybatis-plus的自带方法List<AbstractMethod> methodList = super.getMethodList(mapperClass, tableInfo);methodList.add(new InsertBatchSomeColumn(i -> i.getFieldFill() != FieldFill.UPDATE));return methodList;}
}

3、注入插件

package com.example.answer_system.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();interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));return interceptor;}//插件，用于批量插入真正的@Beanpublic EasySqlInjector easySqlInjector() {return new EasySqlInjector();}
}

4、编写自己的mapper继承BaseMapper

package com.example.answer_system.base;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import java.util.Collection;public interface BasePlusMapper <T> extends BaseMapper<T> {//真正的批量插入Integer insertBatchSomeColumn(Collection<T> entityList);
}

5、代码中使用，实体类的mapper继承自己编写的BasePlusMapper
在代码中使用时
baseMapper.insertBatchSomeColumn(list);则可实现真正的批量插入