前面我们已经了解到Spring IoC容器初始化是调用AbstractApplicationContext.refresh()方法
1 public void refresh() throws BeansException, IllegalStateException { 2 synchronized (this.startupShutdownMonitor) { 3 // Prepare this context for refreshing. 4 prepareRefresh(); 5 6 // Tell the subclass to refresh the internal bean factory. 7 ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory(); 8 9 // Prepare the bean factory for use in this context. 10 prepareBeanFactory(beanFactory); 11 12 try { 13 // Allows post-processing of the bean factory in context subclasses. 14 postProcessBeanFactory(beanFactory); 15 16 // Invoke factory processors registered as beans in the context. 17 invokeBeanFactoryPostProcessors(beanFactory); 18 19 // Register bean processors that intercept bean creation. 20 registerBeanPostProcessors(beanFactory); 21 22 // Initialize message source for this context. 23 initMessageSource(); 24 25 // Initialize event multicaster for this context. 26 initApplicationEventMulticaster(); 27 28 // Initialize other special beans in specific context subclasses. 29 onRefresh(); 30 31 // Check for listener beans and register them. 32 registerListeners(); 33 34 // Instantiate all remaining (non-lazy-init) singletons. 35 finishBeanFactoryInitialization(beanFactory); 36 37 // Last step: publish corresponding event. 38 finishRefresh(); 39 } 40 41 catch (BeansException ex) { 42 if (logger.isWarnEnabled()) { 43 logger.warn("Exception encountered during context initialization - " + 44 "cancelling refresh attempt: " + ex); 45 } 46 47 // Destroy already created singletons to avoid dangling resources. 48 destroyBeans(); 49 50 // Reset 'active' flag. 51 cancelRefresh(ex); 52 53 // Propagate exception to caller. 54 throw ex; 55 } 56 } 57 }
那么,spring是在什么时候初始化BeanFactory容器呢?
一,当使用tomcat时,在web.xml中会配置servlet
1 <servlet> 2 <servlet-name>service</servlet-name> 3 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 4 <load-on-startup>1</load-on-startup> 5 </servlet>