(七)SpringBoot启动配置原理

几个重要的事件回调机制

ApplicationContextInitializer

SpringApplicationRunListener

ApplicationRunner

CommandLineRunner

启动流程

1.创建SpringApplication对象

 1 initialize(sources);
 2 private void initialize(Object[] sources) {
 3         //保存主配置类
 4         if (sources != null && sources.length > 0) {
 5         this.sources.addAll(Arrays.asList(sources));
 6     }
 7     //判断当前是否是一个web应用
 8     this.webEnvironment = deduceWebEnvironment();
 9     //从类路径下META-INF/spring.factories配置的所有ApplicationContextInitializer;然后保存起来
10     setInitializers((Collection)          getSpringFactoriesInstances(ApplicationContextInitializer.class));
11     //从类路径下找到META-INF/spring.factories配置的所有ApplicationListener;
12     setListeners((Collection)     getSpringFactoriesInstances(ApplicationListener.class));
13     //从多个配置类中找到那个有main方法的主配置类
14     this.mainApplicationClass = deduceMainApplicationClass();
15 }

2.运行run方法

原文地址：https://www.cnblogs.com/yang-young-young/p/9498992.html