依赖

		<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-core</artifactId>
            <version>3.4.3.4</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-extension</artifactId>
            <version>3.3.2</version>
        </dependency>

代码

public static void mybatisPlus(List<HnLegalSystemWarranty> list) {
        // 配置数据源
        DruidDataSource dataSource = getDruidDataSource();

        // 创建 TransactionFactory
        TransactionFactory transactionFactory = new JdbcTransactionFactory();

        // 配置环境
        Environment environment = new Environment("development", transactionFactory, dataSource);
        Configuration configuration = new Configuration(environment);

        // 添加 Mapper
        configuration.addMapper(HnLegalSystemWarrantyMapper.class);

        // 构建 SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(configuration);

        // 使用 SqlSession 执行 MyBatis-Plus 增强方法
        try (SqlSession sqlSession = sqlSessionFactory.openSession(true)) {
            HnLegalSystemWarrantyMapper mapper = sqlSession.getMapper(HnLegalSystemWarrantyMapper.class);
            list.forEach(mapper::insertHnLegalSystemWarranty);
        }
        log.info("插入完成");
    }

    /**
     * 配置数据源
     */
    private static DruidDataSource getDruidDataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl("数据库地址");
		// 根据mysql版本变动
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUsername("账户");
        dataSource.setPassword("密码");
        dataSource.setInitialSize(5);
        dataSource.setMaxActive(10);
        dataSource.setMinIdle(1);
        dataSource.setMaxWait(60000);
        return dataSource;
    }

PS:还有一种写法，通过加载配置文件的方式

public static void mybatisPlus(List<HnLegalSystemWarranty> list) throws IOException {
        // 配置数据源
        DruidDataSource dataSource = getDruidDataSource();

        // 加载 MyBatis 配置文件
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);

        // 构建 SqlSessionFactory
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        SqlSessionFactory sqlSessionFactory = builder.build(inputStream);

        // 手动设置数据源
        Configuration configuration = sqlSessionFactory.getConfiguration();
        configuration.setEnvironment(new org.apache.ibatis.mapping.Environment("development",
                new org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory(), dataSource));
//        configuration.addMapper(HnLegalSystemWarrantyMapper.class);

        // 使用 SqlSession 执行 MyBatis-Plus 增强方法
        try (SqlSession sqlSession = sqlSessionFactory.openSession(true)) {
            HnLegalSystemWarrantyMapper mapper = sqlSession.getMapper(HnLegalSystemWarrantyMapper.class);

            list.forEach(mapper::insertHnLegalSystemWarranty);
        }
        log.info("插入完成");
    }

// mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <mappers>
        <mapper resource="mapper/HnLegalSystemWarrantyMapper.xml"/>
    </mappers>
</configuration>

在这里不可以直接调用mybatis-plus的增强方法，因为他是隐式调用的，在不启动spring的情况下，无法自动的启动它的工厂类，来实现注入。