spring web项目加载过程

1. 监听容器初始化tomcat web.xml 中配置

  
     org.springframework.web.context.ContextLoaderListener
       
 
  
    contextConfigLocation  
    classpath:applicationContext.xml  
 

在contextInitialized时候调用 初始化web应用context

/**
* Initialize the root web application context.
*/
@Override
public void contextInitialized(ServletContextEvent event) {
initWebApplicationContext(event.getServletContext());
}

2 然后 创建创建context

this.context = createWebApplicationContext(servletContext);

3 配置和刷新context

configureAndRefreshWebApplicationContext(cwac, servletContext);

4在AbstractApplicationContext.refresh 接口中会初始化容器中的bean

// Instantiate all remaining (non-lazy-init) singletons.
finishBeanFactoryInitialization(beanFactory);

参考文件
https://juejin.im/post/6844903492977442823
https://blog.csdn.net/hl_java/article/details/79698775