SpringBoot的starter到底是什么？( 二 ) _生活百科

MANIFEST.MF 这个文件描述了该Jar文件的很多信息

spring.factories SPI会读取的文件

spring-configuration-metadata.json 系统自动生成的IDE提示功能

ConfigurationCustomizer 自定义Configuration回调接口

MybatisAutoConfiguration mybatis配置类

MybatisProperties mybatis属性类

SpringBootVFS 扫描嵌套的jar包中的类

spring-configuration-metadata.json和additional-spring-configuration-metadata.json的功能差不多，我们在applicationContext.properties文件中输入spring时，会自动出现下面的配置信息可供选择，就是这个功能了。

文章插图
来自灵魂的一问：这两个文件有什么区别?
答：如果pom.xml中引入了spring-boot-configuration-processor包，则会自动生成spring-configuration-metadata.json 。
如果需要手动修改里面的元数据，则可以在additional-spring-configuration-metadata.json中编辑，最终两个文件中的元数据会合并到一起。
MybatisProperties类是属性实体类：

@ConfigurationProperties(prefix = MybatisProperties.MYBATIS_PREFIX)public class MybatisProperties {public static final String MYBATIS_PREFIX = "mybatis";private String configLocation;private String[] mapperLocations;private String typeAliasesPackage;private String typeHandlersPackage;private boolean checkConfigLocation = false;private ExecutorType executorType;private Properties configurationProperties;@NestedConfigurationPropertyprivate Configuration configuration;public String getConfigLocation() {return this.configLocation;}public void setConfigLocation(String configLocation) {this.configLocation = configLocation;}@Deprecatedpublic String getConfig() {return this.configLocation;}@Deprecatedpublic void setConfig(String config) {this.configLocation = config;}public String[] getMapperLocations() {return this.mapperLocations;}public void setMapperLocations(String[] mapperLocations) {this.mapperLocations = mapperLocations;}public String getTypeHandlersPackage() {return this.typeHandlersPackage;}public void setTypeHandlersPackage(String typeHandlersPackage) {this.typeHandlersPackage = typeHandlersPackage;}public String getTypeAliasesPackage() {return this.typeAliasesPackage;}public void setTypeAliasesPackage(String typeAliasesPackage) {this.typeAliasesPackage = typeAliasesPackage;}public boolean isCheckConfigLocation() {return this.checkConfigLocation;}public void setCheckConfigLocation(boolean checkConfigLocation) {this.checkConfigLocation = checkConfigLocation;}public ExecutorType getExecutorType() {return this.executorType;}public void setExecutorType(ExecutorType executorType) {this.executorType = executorType;}public Properties getConfigurationProperties() {return configurationProperties;}public void setConfigurationProperties(Properties configurationProperties) {this.configurationProperties = configurationProperties;}public Configuration getConfiguration() {return configuration;}public void setConfiguration(Configuration configuration) {this.configuration = configuration;}public Resource[] resolveMapperLocations() {ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();List<Resource> resources = new ArrayList<Resource>();if (this.mapperLocations != null) {for (String mapperLocation : this.mapperLocations) {try {Resource[] mappers = resourceResolver.getResources(mapperLocation);resources.addAll(Arrays.asList(mappers));} catch (IOException e) {// ignore}}}return resources.toArray(new Resource[resources.size()]);}}

可以看到Mybatis初始化所需要的很多属性都在这里，相当于一个JavaBean 。
下面重点看一下MybatisAutoConfiguration的代码：

@org.springframework.context.annotation.Configuration@ConditionalOnClass({ SqlSessionFactory.class, SqlSessionFactoryBean.class })@ConditionalOnBean(DataSource.class)@EnableConfigurationProperties(MybatisProperties.class)@AutoConfigureAfter(DataSourceAutoConfiguration.class)public class MybatisAutoConfiguration {private static final Logger logger = LoggerFactory.getLogger(MybatisAutoConfiguration.class);private final MybatisProperties properties;private final Interceptor[] interceptors;private final ResourceLoader resourceLoader;private final DatabaseIdProvider databaseIdProvider;private final List<ConfigurationCustomizer> configurationCustomizers;public MybatisAutoConfiguration(MybatisProperties properties,ObjectProvider<Interceptor[]> interceptorsProvider,ResourceLoader resourceLoader,ObjectProvider<DatabaseIdProvider> databaseIdProvider,ObjectProvider<List<ConfigurationCustomizer>> configurationCustomizersProvider) {this.properties = properties;this.interceptors = interceptorsProvider.getIfAvailable();this.resourceLoader = resourceLoader;this.databaseIdProvider = databaseIdProvider.getIfAvailable();this.configurationCustomizers = configurationCustomizersProvider.getIfAvailable();}@PostConstructpublic void checkConfigFileExists() {if (this.properties.isCheckConfigLocation() && StringUtils.hasText(this.properties.getConfigLocation())) {Resource resource = this.resourceLoader.getResource(this.properties.getConfigLocation());Assert.state(resource.exists(), "Cannot find config location: " + resource+ " (please add config file or check your Mybatis configuration)");}}@Bean@ConditionalOnMissingBeanpublic SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {SqlSessionFactoryBean factory = new SqlSessionFactoryBean();factory.setDataSource(dataSource);factory.setVfs(SpringBootVFS.class);if (StringUtils.hasText(this.properties.getConfigLocation())) {factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));}Configuration configuration = this.properties.getConfiguration();if (configuration == null && !StringUtils.hasText(this.properties.getConfigLocation())) {configuration = new Configuration();}if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {for (ConfigurationCustomizer customizer : this.configurationCustomizers) {customizer.customize(configuration);}}factory.setConfiguration(configuration);if (this.properties.getConfigurationProperties() != null) {factory.setConfigurationProperties(this.properties.getConfigurationProperties());}if (!ObjectUtils.isEmpty(this.interceptors)) {factory.setPlugins(this.interceptors);}if (this.databaseIdProvider != null) {factory.setDatabaseIdProvider(this.databaseIdProvider);}if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());}if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());}if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {factory.setMapperLocations(this.properties.resolveMapperLocations());}return factory.getObject();}@Bean@ConditionalOnMissingBeanpublic SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {ExecutorType executorType = this.properties.getExecutorType();if (executorType != null) {return new SqlSessionTemplate(sqlSessionFactory, executorType);} else {return new SqlSessionTemplate(sqlSessionFactory);}}public static class AutoConfiguredMapperScannerRegistrarimplements BeanFactoryAware, ImportBeanDefinitionRegistrar, ResourceLoaderAware {private BeanFactory beanFactory;private ResourceLoader resourceLoader;@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);try {if (this.resourceLoader != null) {scanner.setResourceLoader(this.resourceLoader);}List<String> packages = AutoConfigurationPackages.get(this.beanFactory);if (logger.isDebugEnabled()) {for (String pkg : packages) {logger.debug("Using auto-configuration base package '{}'", pkg);}}scanner.setAnnotationClass(Mapper.class);scanner.registerFilters();scanner.doScan(StringUtils.toStringArray(packages));} catch (IllegalStateException ex) {logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.", ex);}}@Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {this.beanFactory = beanFactory;}@Overridepublic void setResourceLoader(ResourceLoader resourceLoader) {this.resourceLoader = resourceLoader;}}@org.springframework.context.annotation.Configuration@Import({ AutoConfiguredMapperScannerRegistrar.class })@ConditionalOnMissingBean(MapperFactoryBean.class)public static class MapperScannerRegistrarNotFoundConfiguration {@PostConstructpublic void afterPropertiesSet() {logger.debug("No {} found.", MapperFactoryBean.class.getName());}}}
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