一文详解SpringBoot3如何自定义starter

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <version>3.3.3</version>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
    <version>3.3.3</version>
  </dependency>

  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.14</version>
  </dependency>

  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>3.0.3</version>
  </dependency>
</dependencies>

@AutoConfiguration  // 表识当前类是一个自动配置类
public class MyBatisAutoConfiguration {
    // SqlSessionFactoryBean
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean;
    }

    // MapperScannerConfigurer
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(BeanFactory beanFactory) {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        // 扫描的包：启动类所在的包及其子包
        List<String> packages = AutoConfigurationPackages.get(beanFactory); // 获取启动类所在的包名
        String basePackage = packages.get(0);   // 因为启动类所在的包只有一个，直接获取第一个
        mapperScannerConfigurer.setBasePackage(basePackage);    // 设置mapper的包扫描路径
        // 扫描的注解：@Mapper
        mapperScannerConfigurer.setAnnotationClass(Mapper.class);
        return mapperScannerConfigurer;
    }
}

com.aizen.config.MyBatisAutoConfiguration

<dependencies>
  <dependency>
    <groupId>com.aizen</groupId>
    <artifactId>dmybatis-spring-boot-autoconfigure</artifactId>
    <version>1.0-SNAPSHOT</version>
  </dependency>
</dependencies>

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis
    username: root
    password: root

@Mapper
public interface UserMapper {
    @Select("select * from user where id = #{id}")
    User findById(Integer id);
}

<!-- 自定义的mybatis起步依赖 -->
<dependency>
    <groupId>com.aizen</groupId>
    <artifactId>dmybatis-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

<!--mysql驱动依赖-->
<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
</dependency>