01_刷新前的预处理

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//Prepare this context for refreshing.刷新前的预处理
prepareRefresh();

1. 初始化一些属性设置

// Initialize any placeholder property sources in the context environment
initPropertySources();

注：此方法是空的，留给子方法实现

2. 验证所欲的属性都是合法的

// Validate that all properties marked as required are resolvable
getEnvironment().validateRequiredProperties();

3. 保存早期的事件，一旦多播器可用就会发布

// Allow for the collection of early ApplicationEvents,
// to be published once the multicaster is available...
this.earlyApplicationEvents = new LinkedHashSet();