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SpringBoot的starter到底是什么？( 二 )

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從上面可以看出，pom.xml文件中會引入一些jar包，其中除了引入spring-boot-starter，之外重點看一下：mybatis-spring-boot-autoconfigure 。
我們找到mybatis-spring-boot-autoconfigure.jar文件，打開這個文件 。

SpringBoot的starter到底是什么？

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里面包含如下文件：
  • pom.properties配置maven所需的項目version、groupId和artifactId
  • pom.xml配置所依賴的jar包
  • additional-spring-configuration-metadata.json手動添加IDE提示功能
  • MANIFEST.MF 這個文件描述了該Jar文件的很多信息
  • spring.factories SPI會讀取的文件
  • spring-configuration-metadata.json 系統(tǒng)自動生成的IDE提示功能
  • ConfigurationCustomizer 自定義Configuration回調(diào)接口
  • MybatisAutoConfiguration mybatis配置類
  • MybatisProperties mybatis屬性類
  • SpringBootVFS 掃描嵌套的jar包中的類
spring-configuration-metadata.json和additional-spring-configuration-metadata.json的功能差不多，我們在applicationContext.properties文件中輸入spring時，會自動出現(xiàn)下面的配置信息可供選擇，就是這個功能了 。
SpringBoot的starter到底是什么？

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來自靈魂的一問：這兩個文件有什么區(qū)別?
答：如果pom.xml中引入了spring-boot-configuration-processor包，則會自動生成spring-configuration-metadata.json 。
如果需要手動修改里面的元數(shù)據(jù)，則可以在additional-spring-configuration-metadata.json中編輯，最終兩個文件中的元數(shù)據(jù)會合并到一起 。
MybatisProperties類是屬性實體類：
@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()]);}}

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