context.setEnvironment;CODE>

 LI STYLE=”font-size:.95EM;color:#555，margin-bottom:

6PX;">Create a fresh DefaultListableBeanFactory – this factory actually creates bean instances. LI STYLE…”font-size:.95EM;color:#555，margin-bottom:

6PX;">Initialize core utilities .

 LI STYLE…其实，”font-size:.95EM;color:#555，margin-bottom:

6PX;">Mark context state as created but not refreshed. UL>

OL START=”3″ STYLE=”margin-left:

30 PX;"> LI STYLE，”font-size:.95EM;color:

bottom这方面，8 PX;">The heavyweight part begins – calling refresh. This method orchestrates every step of bean loading.

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‘font-size :.95EM;按理说，color :#777;’ prepareRefresh – lock context to prevent concurrent refreshes,set active profiles。clear cached metadata.

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‘font-size :.95EM;color :#777，’ obtainFreshBeanFactory – discard old factory if any and create a brand new DefaultListableBeanFactory with proper ClassLoader。BeanExpressionResolver and AutowireCandidateResolver.

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‘font- size的观点是，.95EM;color :

’ scan components – execute @ComponentScan based on main application’s package,generate BeanDefinition objects and register m in BeanDefinitionRegistry.

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’ postProcessBeanFactory – invoke all ConfigurableListableBeanFactoryPostProcessor beans。allowing modification of bean definitions before any bean gets instantiated.

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1Px solid #ddd;怎么说呢，'> void postProcessBeanFactory{ // custom logic can add/remove/modify BeanDefinitions here } CODE

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’ registerBeanPostProcessors – locate every BeanPostProcessor definition。instantiate m early and add m to factory’s post‑processor chain.

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3Px;border- 至于radius，3Px;'> beanFactory.addBeanPostProcessor;CODE

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’ initializeMessageSource – set up internal MessageSource for internationalization.

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’ initApplicationEventMulticaster – prepare an EventMulticaster for publishing later events.

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’ registerListeners – turn all ApplicationListener beans into listeners of that multicaster.

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’ instantiate non‑lazy singleton beans – freeze bean definitions,n create every singleton that isn’t marked lazy by executing its full lifecycle (instantiation → dependency injection → BeanPostProcessor.beforeInitialization → init methods → BeanPostProcessor.afterInitialization → registration in singleton cache).

UL END

Li Style = ‘ margin- top : 10 Px ’> PUBLISH CONTEXT REFRESHED EVENT: The whole container is now fully initialized. Code end.

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Li styl e=' margin–bottom :

8 Px;'> Start embedded Tomcat . The server starts after refresh because it needs beans such as DispatcherServlet,Filter and Servlet which are only created once context is fully ready.

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13 Px;说起来，'>Create Tomcat instance.

13 Px;'>Load connectors and context configuration.

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13 Px;'>Bind port .

13 Px;'>Start Tomcat’s acceptor thread so it begins listening for HTTP requests. UL>

Li>You call `SpringApplication.run` → it builds a `SpringApplication` object that prepares an `Environment`,loads initializers/listeners and decides which `ApplicationContext` subclass to create.

Li>The chosen `ApplicationContext` creates a fresh `DefaultListableBeanFactory`. Then `refresh` performs a series of well‑defined steps:

• Prepare refresh

• Create fresh bean factory

• Scan packages → register `BeanDefinition`s

• Apply `BeanFactoryPostProcessor`s

• Register all `BeanPostProcessor`s

• Initialize message source &amp，amp;amp，a nd event multicaster

• Instantiate all non‑lazy singletons 

• Publish `ContextRefreshedEvent`.

Li>If it’s a servlet web app,after refresh Spring Boot starts an embedded Tomcat which finally registers DispatcherServlet etc.。and your service becomes reachable via HTTP.

Li>If it’s reactive or non‑web,corresponding contexts take over without starting a servlet container.

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