引入包

<dependency>
	<groupId>com.baomidou</groupId>
	<artifactId>mybatis-plus-core</artifactId>
	<version>3.5.7</version>
	<exclusions>
		<exclusion>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
		</exclusion>
	</exclusions>
</dependency>

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.5.7</version>
</dependency>

<dependency>
    <artifactId>mybatis</artifactId>
    <groupId>org.mybatis</groupId>
    <version>3.5.16</version>
</dependency>

MyBatis-Plus提供的InsertBatchSomeColumn方法（推荐）

扩展这个InsertBatchSomeColumn方法

package io.jiefang.common.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 {
    @Override
    public 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));
        System.out.println("扩展的getMethodList方法被框架调用了");
        return methodList;
    }
}

扩展的方法注入bean容器

package io.jiefang.common.config;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.BlockAttackInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import io.jiefang.common.interceptor.DataFilterInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * mybatis-plus配置
 *
 * @since 1.0.0
 */
@Configuration
public class MybatisPlusConfig {
    @Bean
    public  EasySqlInjector sqlInjector(){
        return new EasySqlInjector();
    }
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        // 数据权限
        mybatisPlusInterceptor.addInnerInterceptor((InnerInterceptor) new DataFilterInterceptor());
        // 分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        // 乐观锁
        mybatisPlusInterceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        // 防止全表更新与删除
        mybatisPlusInterceptor.addInnerInterceptor(new BlockAttackInnerInterceptor());
        return mybatisPlusInterceptor;
    }

}

创建一个Mapper去实现我们的扩展的

package io.jiefang.common.dao;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.executor.BatchResult;
import java.util.Collection;
import java.util.List;
/**
 * 基础Dao
 */
public interface BaseDao<T> extends BaseMapper<T> {
    /**
     * 批量插入 仅适用于mysql
     *
     * @param entityList 实体列表
     * @return 影响行数
     */
    Integer insertBatchSomeColumn(Collection<T> entityList);
}

业务层

@Override
public Long add5() {
	long start = System.currentTimeMillis();
	List<User> userList= new ArrayList<>();
	User user ;
	for (int i = 0; i < 50; i++) {
		user = new User();
		user.setUsername("name"+i);
		user.setPassword("password"+i);
		userList.add(user);
	}
	userMapper.insertBatchSomeColumn(userList);
	long end = System.currentTimeMillis();
	System.out.println("耗时："+( end - start ) + "ms");
	return (end-start);
}