SpringBoot启动流程
2021-11-26 16:01:32 0 举报Spring应用在启动的时候，SpringBoot都帮我们做了哪些事情？通过流程图的形式直观的了解
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this.resourceLoader = resourceLoader设置资源加载器resourceLoader，本例中为null
this.mainApplicationClass = deduceMainApplicationClass();推断应用引导类
1. 构造SpringApplication实例SpringApplication application = new SpringApplication(MyApplication.class)
setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));加载Spring应用上下文初始化器
ConfigurableApplicationContext context = createApplicationContext();创建Spring应用上下文
DefaultBootstrapContext bootstrapContext = createBootstrapContext();使用bootstrapRegistryInitializers初始化器来初始化启动上下文
refreshContext(context);Spring应用上下文启动阶段
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);装配applicationArguments，简化Spring应用命令行启动参数
setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));加载Spring应用事件监听器
this.webApplicationType = WebApplicationType.deduceFromClasspath();从类路径推断web应用类型，本例中为Servlet
2. 配置Spring应用（可选）
this.bootstrapRegistryInitializers = getBootstrapRegistryInitializersFromSpringFactories();加载Spring应用启动注册初始化器bootstrapRegistryInitializers，在运行阶段用
this.primarySources = new LinkedHashSet<>(Arrays.asList(primarySources));设置主配置类集合primarySources本例中为com.example.springstudy.MyApplication
3. 运行阶段application.run()
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