SpringBoot 创建容器的实现
spring容器的创建对应SpringApplication中run中调用的createApplicationContext方法。这里创建了一个web容器，接下就进去prepareContext容器准备阶段：
privatevoidprepareContext(ConfigurableApplicationContextcontext,ConfigurableEnvironmentenvironment,
SpringApplicationRunListenerslisteners,ApplicationArgumentsapplicationArguments,BannerprintedBanner){
//为容器设置环境
context.setEnvironment(environment);
//这里的空实现留给开发者扩展，设置数据转换的ConversionService
postProcessApplicationContext(context);
//执行容器中的Initializers的initialize方法
applyInitializers(context);
listeners.contextPrepared(context);
if(this.logStartupInfo){
logStartupInfo(context.getParent()==null);
logStartupProfileInfo(context);
}
//Addbootspecificsingletonbeans
ConfigurableListableBeanFactorybeanFactory=context.getBeanFactory();
beanFactory.registerSingleton("springApplicationArguments",applicationArguments);
if(printedBanner!=null){
beanFactory.registerSingleton("springBootBanner",printedBanner);
}
if(beanFactoryinstanceofDefaultListableBeanFactory){
((DefaultListableBeanFactory)beanFactory)
.setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding);
}
if(this.lazyInitialization){
context.addBeanFactoryPostProcessor(newLazyInitializationBeanFactoryPostProcessor());
}
//Loadthesources
Set
看一下这里的load方法,这里主要把我们的启动类作为Bean注册到了Spring的容器中。
protectedvoidload(ApplicationContextcontext,Object[]sources){
if(logger.isDebugEnabled()){
logger.debug("Loadingsource"+StringUtils.arrayToCommaDelimitedString(sources));
}
BeanDefinitionLoaderloader=createBeanDefinitionLoader(getBeanDefinitionRegistry(context),sources);
if(this.beanNameGenerator!=null){
loader.setBeanNameGenerator(this.beanNameGenerator);
}
if(this.resourceLoader!=null){
loader.setResourceLoader(this.resourceLoader);
}
if(this.environment!=null){
loader.setEnvironment(this.environment);
}
loader.load();
}
/**
*Loadthesourcesintothereader.
*@returnthenumberofloadedbeans
*/
intload(){
intcount=0;
for(Objectsource:this.sources){
count+=load(source);
}
returncount;
}
privateintload(Objectsource){
Assert.notNull(source,"Sourcemustnotbenull");
if(sourceinstanceofClass){
returnload((Class)source);
}
if(sourceinstanceofResource){
returnload((Resource)source);
}
if(sourceinstanceofPackage){
returnload((Package)source);
}
if(sourceinstanceofCharSequence){
returnload((CharSequence)source);
}
thrownewIllegalArgumentException("Invalidsourcetype"+source.getClass());
}
privateintload(Classsource){
if(isGroovyPresent()&&GroovyBeanDefinitionSource.class.isAssignableFrom(source)){
//AnyGroovyLoadersaddedinbeans{}DSLcancontributebeanshere
GroovyBeanDefinitionSourceloader=BeanUtils.instantiateClass(source,GroovyBeanDefinitionSource.class);
load(loader);
}
if(isEligible(source)){
this.annotatedReader.register(source);
return1;
}
return0;
}
再来看下contextLoaded方法，这里将上下文设置到监听器中，同时也把监听器添加到上下文中。最后发布了一个ApplicationPreparedEvent事件。
publicvoidcontextLoaded(ConfigurableApplicationContextcontext){
for(ApplicationListenerlistener:this.application.getListeners()){
if(listenerinstanceofApplicationContextAware){
((ApplicationContextAware)listener).setApplicationContext(context);
}
context.addApplicationListener(listener);
}
this.initialMulticaster.multicastEvent(newApplicationPreparedEvent(this.application,this.args,context));
}
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