Spring中重要的核心类和设计理念

　　Spring中又两个看着相似的接口，BeanFactory,FactoryBean，它们到底有什么作用和区别呢？

　　Spring中管理的Bean是由什么类解析呢？答案就是BeanFactory。

　　打开AbstractApplicationContext类，看refresh方法：

 public void refresh() throws BeansException, IllegalStateException {
        synchronized(this.startupShutdownMonitor) {
            this.prepareRefresh();
            ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory();
            this.prepareBeanFactory(beanFactory);

            try {
                this.postProcessBeanFactory(beanFactory);
                this.invokeBeanFactoryPostProcessors(beanFactory);
                this.registerBeanPostProcessors(beanFactory);
                this.initMessageSource();
                this.initApplicationEventMulticaster();
                this.onRefresh();
                this.registerListeners();
　　　　　　　　　　// 创建BeanFactory,就相当于创建一个汽车制造厂。
                this.finishBeanFactoryInitialization(beanFactory);
                this.finishRefresh();
            } catch (BeansException var9) {
                if (this.logger.isWarnEnabled()) {
                    this.logger.warn("Exception encountered during context initialization - cancelling refresh attempt: " + var9);
                }

                this.destroyBeans();
                this.cancelRefresh(var9);
                throw var9;
            } finally {
                this.resetCommonCaches();
            }
        }
    }

　　可以看到创建bean和销毁bean的过程。　　

参考资料 《深入分析javaWeb》