什么時(shí)候創(chuàng)建嵌入式的Servlet容器工廠?什么時(shí)候獲取嵌入式的Servlet容器并啟動(dòng)Tomcat;
獲取嵌入式的Servlet容器工廠:
- springboot應(yīng)用啟動(dòng)運(yùn)行run方法
- refreshContext(context):springBoot刷新IOC容器[創(chuàng)建IOC容器對(duì)象,并初始化容器,創(chuàng)建容器中的每一個(gè)組件];如果是web應(yīng)用創(chuàng)建web.servlet.context.AnnotationConfigServletWebServerApplicationContext, 否則,創(chuàng)建默認(rèn)的AnnotationConfigReactiveWebServerApplicationContext;
- refresh(Context)刷新剛才創(chuàng)建的容器.
@Override
public void refresh() throws BeansException, IllegalStateException {
synchronized (this.startupShutdownMonitor) {
// Prepare this context for refreshing.
prepareRefresh();
// Tell the subclass to refresh the internal bean factory.
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
// Prepare the bean factory for use in this context.
prepareBeanFactory(beanFactory);
try {
// Allows post-processing of the bean factory in context subclasses.
postProcessBeanFactory(beanFactory);
// Invoke factory processors registered as beans in the context.
invokeBeanFactoryPostProcessors(beanFactory);
// Register bean processors that intercept bean creation.
registerBeanPostProcessors(beanFactory);
// Initialize message source for this context.
initMessageSource();
// Initialize event multicaster for this context.
initApplicationEventMulticaster();
// Initialize other special beans in specific context subclasses.
onRefresh();
// Check for listener beans and register them.
registerListeners();
// Instantiate all remaining (non-lazy-init) singletons.
finishBeanFactoryInitialization(beanFactory);
// Last step: publish corresponding event.
finishRefresh();
}
catch (BeansException ex) {
if (logger.isWarnEnabled()) {
logger.warn("Exception encountered during context initialization - " +
"cancelling refresh attempt: " + ex);
}
// Destroy already created singletons to avoid dangling resources.
destroyBeans();
// Reset 'active' flag.
cancelRefresh(ex);
// Propagate exception to caller.
throw ex;
}
finally {
// Reset common introspection caches in Spring's core, since we
// might not ever need metadata for singleton beans anymore...
resetCommonCaches();
}
}
}
- onRefresh(); web的IOC容器重寫了onfresh方法.
web ioc容器會(huì)創(chuàng)建嵌入式的servlet容器:createWebServer(); - ServletWebServerFactory factory = getWebServerFactory();
- 獲取嵌入式的servlet容器工廠,
從ioc容器中獲取ServletWebServerFactory組件,TomcatServletWebServerFactory創(chuàng)建對(duì)象,后置處理器一看是這個(gè)對(duì)象,就獲取所有的定制器來先定制servlet容器的相關(guān)配置 - 使用容器工廠獲取嵌入式的servlet容器
- 嵌入式的servlet容器創(chuàng)建對(duì)象,并啟動(dòng)servlet容器,
先啟動(dòng)嵌入式的servlet容器,在將ioc容器中剩下的沒有創(chuàng)建出的對(duì)象獲取出來.
ioc容器啟動(dòng)創(chuàng)建嵌入式的servlet容器.
