SpringBoot-启动过程

 1     public SpringApplication(Object... sources) {
 2         initialize(sources);
 3     }
 4     public SpringApplication(ResourceLoader resourceLoader, Object... sources) {
 5         this.resourceLoader = resourceLoader;
 6         initialize(sources);
 7     }
 8 
 9     @SuppressWarnings({ "unchecked", "rawtypes" })
10     private void initialize(Object[] sources) {
11         if (sources != null && sources.length > 0) {
12             this.sources.addAll(Arrays.asList(sources));
13         }
14                 //创建Environment
15         this.webEnvironment = deduceWebEnvironment();
16                 //获取并保存ApplicationContextInitializer
17         setInitializers((Collection) getSpringFactoriesInstances(
18                 ApplicationContextInitializer.class));
19                 //获取并保存ApplicationContextListener
20         setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));
21                 //保存程序入口，作为配置入口
22         this.mainApplicationClass = deduceMainApplicationClass();
23     }        

 1 public ConfigurableApplicationContext run(String... args) {
 2         StopWatch stopWatch = new StopWatch();
 3         stopWatch.start();
 4         ConfigurableApplicationContext context = null;
 5         FailureAnalyzers analyzers = null;
 6         configureHeadlessProperty();
 7                 //获取SpringApplicationRunListener
 8         SpringApplicationRunListeners listeners = getRunListeners(args);
 9                 //调用监听器，开始启动
10         listeners.starting();
11         try {
12                         //生成ApplicationContext配置参数
13             ApplicationArguments applicationArguments = new DefaultApplicationArguments(
14                     args);
15                         //准备创建ApplicationContext的环境
16             ConfigurableEnvironment environment = prepareEnvironment(listeners,
17                     applicationArguments);
18             Banner printedBanner = printBanner(environment);
19                         //创建ApplicationContext
20             context = createApplicationContext();
21             analyzers = new FailureAnalyzers(context);
22                         //准备配置ApplicationContext的条件
23             prepareContext(context, environment, listeners, applicationArguments,
24                     printedBanner);
25                         //刷新ApplicationContext
26             refreshContext(context);
27                         //执行刷新后的动作，包括执行ApplicationRunner和CommandRunner
28             afterRefresh(context, applicationArguments);
29                         //启动结束
30             listeners.finished(context, null);
31             stopWatch.stop();
32             if (this.logStartupInfo) {
33                 new StartupInfoLogger(this.mainApplicationClass)
34                         .logStarted(getApplicationLog(), stopWatch);
35             }
36             return context;
37         }
38         catch (Throwable ex) {
39             handleRunFailure(context, listeners, analyzers, ex);
40             throw new IllegalStateException(ex);
41         }
42     }