SpringBoot速成（六）自定义starter

参考视频：黑马程序员springboot3+vue P10-P11

1.自动配置：

在pom.xml中引入web依赖，则自动生成一个dispatcherServlet

怎么看一个注解的解释：

启动类注解：

Ctrl+click：

2.自定义starter:多个团队用时

再创建一个项目：

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>spb2</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target></properties>
<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId><version>3.1.2</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jdbc</artifactId><version>3.0.0</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.11</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>3.0.0</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>3.0.0</version><scope>compile</scope></dependency></dependencies>
</project>

MyBatisAutoConfig:

SqlSessionFactory 是 MyBatis 中的核心组件，它的主要作用是创建 SqlSession，而 SqlSession 是执行命令、获取映射器和管理事务的。

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MapperScannerConfigurer 是一个 Spring 集成 MyBatis 的工具类，用于扫描指定包路径下的接口，并将带有 @Mapper 注解的接口注册为 Spring 的 Bean。

package com.itheima.config;import org.apache.ibatis.annotations.Mapper;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
import org.springframework.context.annotation.Bean;import javax.sql.DataSource;
import java.util.List;//自动配置类
public class MyBatisAutoConfig {//SqlSessionFactory:创建sqlsession,并告诉连接哪个database;@Beanpublic SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);return  sqlSessionFactoryBean;}@Bean
public MapperScannerConfigurer mapperScannerConfigurer(BeanFactory beanFactory){//扫描哪个包MapperScannerConfigurer mapperScannerConfigurer=new MapperScannerConfigurer();List<String> packages= AutoConfigurationPackages.get(beanFactory);String p=packages.get(0);//包名mapperScannerConfigurer.setBasePackage(p);//扫描mapper接口mapperScannerConfigurer.setAnnotationClass(Mapper.class);return mapperScannerConfigurer;
}}

META-INF.spring:

com.itheima.config.MyBatisAutoConfig