SpringBoot 在项目根路径添加 config 配置，有些项目运行的时候配置不起作用，本文对SpringBoot源码配置文件加载进行解读学习探究

SpringBoot 集成 NacosRegister 源码启动顺序

1. @SpringBootApplication 注解 main 函数执行
2. SpringBootApp() 构造函数

   • getSpringFactoriesInstances(BootstrapRegistryInitializer.class) 加载

     • SpringFactoriesLoader.loadFactoryNames(type, classLoader)

     • SpringFactoriesLoader.loadSpringFactories

       • Enumeration urls = classLoader.getResources(‘META-INF/spring.factories’)
       • urls.foreach

         • jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-config/2.2.4/nacos-config-2.2.4.jar!/META-INF/spring.factories

         • Properties properties = PropertiesLoaderUtils.loadProperties(new UrlResource(url))

           • #fillProperties(new Properties(), resource)
             • resource.getInputStream()
               • URLConnection con = this.url.openConnection()
               • return con.getInputStream();

         • properties:

           • org.springframework.context.ApplicationContextInitializer ->
             • com.alibaba.nacos.config.server.utils.PropertyUtil

         • jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-core/2.2.4/nacos-core-2.2.4.jar!/META-INF/spring.factories

         • properties:

           • org.springframework.boot.SpringApplicationRunListener ->

             • com.alibaba.nacos.core.code.SpringApplicationRunListener

           • org.springframework.context.ApplicationListener ->

             • com.alibaba.nacos.core.code.StandaloneProfileApplicationListener

         • jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-sys/2.2.4/nacos-sys-2.2.4.jar!/META-INF/spring.factories

         • properties:

           • org.springframework.context.ApplicationContextInitializer ->
             • com.alibaba.nacos.sys.utils.ApplicationUtils

         • … 后续循环看下面章节

   • BootstrapRegistryInitializer.class：

     • 加载到：
       • org.springframework.cloud.bootstrap.RefreshBootstrapRegistryInitializer
       • org.springframework.cloud.bootstrap.TextEncryptorConfigBootstrapper
     • #createSpringFactoriesInstances 创建实例
       • 0 = {RefreshBootstrapRegistryInitializer@1822}
       • 1 = {TextEncryptorConfigBootstrapper@1823}

   • getSpringFactoriesInstances(ApplicationContextInitializer.class) 加载

   • ApplicationContextInitializer.class

   • 赋值到 bootstrapRegistryInitializers 字段

   • META-INF/spring.factories

3. SpringBootApp#run 函数执行
   • 执行 prepareEnvironment 准备变量
     • #getOrCreateEnvironment
     • #applicationContextFactory.createEnvironment(this.webApplicationType)
       • getFromSpringFactories 读取
   • 根据 webApplicationType 和 applicationContextFactory 创建环境对象
   • SpringBootApp.listeners 触发 environmentPrepared 监听

     • com.alibaba.nacos.core.code.SpringApplicationRunListener [nacos 监听到事件]

     • EventPublishingRunListener 监听到 environmentPrepared
       • 使用 initialMulticaster 多播 ApplicationEnvironmentPreparedEvent 事件
     • EnvironmentPostProcessorApplicationListener 接收到多播事件
       • 多个 EnvironmentPostProcessor 循环处理事件
       • ConfigDataEnvironmentPostProcessor 轮到处理事件
         • ConfigDataEnvironmentContributors 和 Binder 一顿循环绕来绕去
         • 然后 ConfigDataImporter 处理配置文件的 resolve
         • 最终 StandardConfigDataLocationResolver resolve
           • optional:file:./;optional:file:./config/;optional:file:./config/*/
           • 然后 #getReferencesForDirectory 函数拼接 目录和文件
             • configNames 字段存储了配置文件的名称
               • [“bootstrap”]
               • [“application”]
           • propertySourceLoaders 字段存储了 两种配置加载器
             • YamlPropertySourceLoader (properties,xml)
             • PropertiesPropertySourceLoader (yml,yaml)
             • file:./application.yaml
             • file:./application.yml
             • file:./application.xml
             • file:./application.properties
             • file:./config/application.yaml
             • file:./config/application.yml
             • file:./config/application.xml
             • file:./config/application.properties
             • file:./config/*/application.yaml
             • file:./config/*/application.yml
             • file:./config/*/application.xml
             • file:./config/*/application.properties
           • 最终 #resolve(StandardConfigDataReference reference) 判断文件存在
     • 返回 ApplicationServletEnvironment 对象
   • SpringBootApp 初始化结束

spring.factories 循环读取完整版

• jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-config/2.2.4/nacos-config-2.2.4.jar!/META-INF/spring.factories

• Properties properties = PropertiesLoaderUtils.loadProperties(new UrlResource(url))

  • #fillProperties(new Properties(), resource)
    • resource.getInputStream()
      • URLConnection con = this.url.openConnection()
      • return con.getInputStream();

• properties:

  • org.springframework.context.ApplicationContextInitializer ->
    • com.alibaba.nacos.config.server.utils.PropertyUtil

• jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-core/2.2.4/nacos-core-2.2.4.jar!/META-INF/spring.factories

• properties:

  • org.springframework.boot.SpringApplicationRunListener ->

    • com.alibaba.nacos.core.code.SpringApplicationRunListener

  • org.springframework.context.ApplicationListener ->

    • com.alibaba.nacos.core.code.StandaloneProfileApplicationListener

• jar:file:/C:/Users/SCWANG/.m2/repository/io/springboot/nacos/nacos-sys/2.2.4/nacos-sys-2.2.4.jar!/META-INF/spring.factories

• properties:

  • org.springframework.context.ApplicationContextInitializer ->
    • com.alibaba.nacos.sys.utils.ApplicationUtils

• jar:file:/C:/Users/SCWANG/.m2/repository/org/springframework/spring-beans/5.3.33/spring-beans-5.3.33.jar!/META-INF/spring.factories

• properties:

  • org.springframework.beans.BeanInfoFactory ->
    • org.springframework.beans.ExtendedBeanInfoFactory

• jar:file:/C:/Users/SCWANG/.m2/repository/org/springframework/cloud/spring-cloud-commons/3.1.7/spring-cloud-commons-3.1.7.jar!/META-INF/spring.factories

• properties:

  • org.springframework.boot.diagnostics.FailureAnalyzer” ->
    • org.springframework.cloud.configuration.CompatibilityNotMetFailureAnalyzer”
  • pringframework.boot.env.EnvironmentPostProcessor” ->
    • org.springframework.cloud.client.HostInfoEnvironmentPostProcessor”
  • pringframework.boot.autoconfigure.EnableAutoConfiguration” ->
    • org.springframework.cloud.client.CommonsClientAutoConfiguration
    • org.springframework.cloud.client.ReactiveCommonsClientAutoConfiguration
    • org.springframework.cloud.client.discovery.composite.CompositeDiscoveryClientAutoConfiguration
    • org.springframework.cloud.client.discovery.composite.reactive.ReactiveCompositeDiscoveryClientAutoConfiguration
    • org.springframework.cloud.client.discovery.simple.SimpleDiscoveryClientAutoConfiguration
    • org.springframework.cloud.client.discovery.simple.reactive.SimpleReactiveDiscoveryClientAutoConfiguration
    • org.springframework.cloud.client.hypermedia.CloudHypermediaAutoConfiguration
    • org.springframework.cloud.client.loadbalancer.AsyncLoadBalancerAutoConfiguration
    • org.springframework.cloud.client.loadbalancer.LoadBalancerAutoConfiguration
    • org.springframework.cloud.client.loadbalancer.LoadBalancerDefaultMappingsProviderAutoConfiguration
    • org.springframework.cloud.client.loadbalancer.reactive.LoadBalancerBeanPostProcessorAutoConfiguration
    • org.springframework.cloud.c”

• jar:file:/C:/Users/SCWANG/.m2/repository/org/springframework/cloud/spring-cloud-context/3.1.7/spring-cloud-context-3.1.7.jar!/META-INF/spring.factories

• properties:

  • org.springframework.boot.BootstrapRegistryInitializer” ->
    • org.springframework.cloud.bootstrap.RefreshBootstrapRegistryInitializer
    • org.springframework.cloud.bootstrap.TextEncryptorConfigBootstrapper”
  • pringframework.boot.env.EnvironmentPostProcessor” ->
    • org.springframework.cloud.bootstrap.encrypt.DecryptEnvironmentPostProcessor
    • org.springframework.cloud.util.random.CachedRandomPropertySourceEnvironmentPostProcessor”
  • pringframework.cloud.bootstrap.BootstrapConfiguration” ->
    • org.springframework.cloud.bootstrap.config.PropertySourceBootstrapConfiguration
    • org.springframework.cloud.bootstrap.encrypt.EncryptionBootstrapConfiguration
    • org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration
    • org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration”
  • pringframework.context.ApplicationListener” ->
    • org.springframework.cloud.bootstrap.BootstrapApplicationListener
    • org.springframework.cloud.bootstrap.LoggingSystemShutdownListener
    • org.springframework.cloud.context.restart.RestartListener”
  • pringframework.boot.autoconfigure.EnableAutoConfiguration” ->
    • org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration
    • org.springframework.cloud.autoconfigure.LifecycleMvcEndpointAutoConfiguration
    • org.springframework.cloud.autoconfigure.RefreshAutoConfiguration
    • org.springframework.cloud.autoconfigure.RefreshEndpointAutoConfiguration
    • org.springframework.cloud.autoconfigure.WritableEnvironmentEndpointAutoConfiguration”

• jar:file:/C:/Users/SCWANG/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.7.18/spring-boot-autoconfigure-2.7.18.jar!/META-INF/spring.factories

• properties:

  • org.springframework.boot.sql.init.dependency.DatabaseInitializerDetector” ->
    • org.springframework.boot.autoconfigure.flyway.FlywayMigrationInitializerDatabaseInitializerDetector”
  • org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider” ->
    • org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider
    • org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider
    • org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider
    • org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider
    • org.springframework.boot.autoconfigure.web.servlet.JspTemplateAvailabilityProvider”
  • org.springframework.boot.env.EnvironmentPostProcessor” ->
    • org.springframework.boot.autoconfigure.integration.IntegrationPropertiesEnvironmentPostProcessor”
  • org.springframework.context.ApplicationContextInitializer” ->
    • org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer
    • org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener”
  • org.springframework.boot.diagnostics.FailureAnalyzer” ->
    • org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer
    • org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer
    • org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer
    • org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer
    • org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer
    • org.springframework.boot.autoconfigure.jooq.NoDslContextBeanFailureAnalyzer
    • org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBeanCreationFailureAnalyzer
    • org.springframework.boot.autoconfigure.r2dbc.MissingR2dbcPoolDependencyFailureAnalyzer
    • org.springframework.boot.autoconfigure.r2dbc.MultipleConnectionPoolConfigurationsFailureAnalyzer
    • org.springframework.boot.autoconfigure.r2dbc.NoConnectionFactoryBeanFailureAnalyzer
    • org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer”
  • org.springframework.boot.sql.init.dependency.DependsOnDatabaseInitializationDetector” ->
    • org.springframework.boot.autoconfigure.batch.JobRepositoryDependsOnDatabaseInitializationDetector
    • org.springframework.boot.autoconfigure.quartz.SchedulerDependsOnDatabaseInitializationDetector
    • org.springframework.boot.autoconfigure.session.JdbcIndexedSessionRepositoryDependsOnDatabaseInitializationDetector”
  • org.springframework.boot.autoconfigure.AutoConfigurationImportListener” ->
    • org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener”
  • org.springframework.context.ApplicationListener” ->
    • org.springframework.boot.autoconfigure.BackgroundPreinitializer”
  • org.springframework.boot.autoconfigure.AutoConfigurationImportFilter” ->
    • org.springframework.boot.autoconfigure.condition.OnBeanCondition
    • org.springframework.boot.autoconfigure.condition.OnClassCondition
    • org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition”

• jar:file:/C:/Users/SCWANG/.m2/repository/org/springframework/boot/spring-boot/2.7.18/spring-boot-2.7.18.jar!/META-INF/spring.factories

• properties:

  • org.springframework.boot.sql.init.dependency.DatabaseInitializerDetector ->
    • org.springframework.boot.flyway.FlywayDatabaseInitializerDetector
    • org.springframework.boot.jdbc.AbstractDataSourceInitializerDatabaseInitializerDetector
    • org.springframework.boot.jdbc.init.DataSourceScriptDatabaseInitializerDetector
    • org.springframework.boot.liquibase.LiquibaseDatabaseInitializerDetector
    • org.springframework.boot.orm.jpa.JpaDatabaseInitializerDetector
    • org.springframework.boot.r2dbc.init.R2dbcScriptDatabaseInitializerDetector
  • org.springframework.boot.env.PropertySourceLoader ->
    • org.springframework.boot.env.PropertiesPropertySourceLoader
    • org.springframework.boot.env.YamlPropertySourceLoader
  • org.springframework.boot.logging.LoggingSystemFactory ->
    • org.springframework.boot.logging.logback.LogbackLoggingSystem.Factory
    • org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.Factory
    • org.springframework.boot.logging.java.JavaLoggingSystem.Factory
  • org.springframework.boot.context.config.ConfigDataLoader ->
    • org.springframework.boot.context.config.ConfigTreeConfigDataLoader
    • org.springframework.boot.context.config.StandardConfigDataLoader
  • org.springframework.boot.SpringApplicationRunListener ->
    • org.springframework.boot.context.event.EventPublishingRunListener
  • org.springframework.boot.diagnostics.FailureAnalysisReporter ->
    • org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter”
  • org.springframework.boot.env.EnvironmentPostProcessor ->
    • org.springframework.boot.cloud.CloudFoundryVcapEnvironmentPostProcessor
    • org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor
    • org.springframework.boot.env.RandomValuePropertySourceEnvironmentPostProcessor
    • org.springframework.boot.env.SpringApplicationJsonEnvironmentPostProcessor
    • org.springframework.boot.env.SystemEnvironmentPropertySourceEnvironmentPostProcessor
    • org.springframework.boot.reactor.DebugAgentEnvironmentPostProcessor”
  • org.springframework.boot.SpringBootExceptionReporter ->
    • org.springframework.boot.diagnostics.FailureAnalyzers”
  • org.springframework.context.ApplicationContextInitializer ->
    • org.springframework.boot.context.ConfigurationWarningsApplicationContextInitializer
    • org.springframework.boot.context.ContextIdApplicationContextInitializer
    • org.springframework.boot.context.config.DelegatingApplicationContextInitializer
    • org.springframework.boot.rsocket.context.RSocketPortInfoApplicationContextInitializer
    • org.springframework.boot.web.context.ServerPortInfoApplicationContextInitializer”
  • org.springframework.boot.diagnostics.FailureAnalyzer ->
    • org.springframework.boot.context.config.ConfigDataNotFoundFailureAnalyzer
    • org.springframework.boot.context.properties.IncompatibleConfigurationFailureAnalyzer
    • org.springframework.boot.context.properties.NotConstructorBoundInjectionFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.BeanCurrentlyInCreationFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.BeanDefinitionOverrideFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.BeanNotOfRequiredTypeFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.BindFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.BindValidationFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.UnboundConfigurationPropertyFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.MutuallyExclusiveConfigurationPropertiesFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.NoSuchMethodFailureAnalyzer
    • org.springframework.boot.diagnostics.analyzer.NoUniqueBeanDefinitionFailureAnalyzer
    • …
  • org.springframework.boot.ApplicationContextFactory ->
    • org.springframework.boot.web.reactive.context.AnnotationConfigReactiveWebServerApplicationContext.Factory
    • org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext.Factory”
  • org.springframework.boot.sql.init.dependency.DependsOnDatabaseInitializationDetector ->
    • org.springframework.boot.sql.init.dependency.AnnotationDependsOnDatabaseInitializationDetector
    • org.springframework.boot.jdbc.SpringJdbcDependsOnDatabaseInitializationDetector
    • org.springframework.boot.jooq.JooqDependsOnDatabaseInitializationDetector
    • org.springframework.boot.orm.jpa.JpaDependsOnDatabaseInitializationDetector”
  • org.springframework.boot.context.config.ConfigDataLocationResolver ->
    • org.springframework.boot.context.config.ConfigTreeConfigDataLocationResolver
    • org.springframework.boot.context.config.StandardConfigDataLocationResolver”
  • org.springframework.context.ApplicationListener ->
    • org.springframework.boot.ClearCachesApplicationListener
    • org.springframework.boot.builder.ParentContextCloserApplicationListener
    • org.springframework.boot.context.FileEncodingApplicationListener
    • org.springframework.boot.context.config.AnsiOutputApplicationListener
    • org.springframework.boot.context.config.DelegatingApplicationListener
    • org.springframework.boot.context.logging.LoggingApplicationListener
    • org.springframework.boot.env.EnvironmentPostProcessorApplicationListener”