SPRINGBOOT

启动流程 #

• 流程图 #

  

• 伪代码 #

  main方法启动： SpringApplication.run(SpringbootApplication.class, args);
  new SpringApplication(sources).run();
  

  SpringApplication#init构造器中的初始化过程

  private void initialize(Object[] sources) {
      if (sources != null && sources.length > 0) {
          this.sources.addAll(Arrays.asList(sources));
      }
      this.webEnvironment = deduceWebEnvironment();
      setInitializers((Collection) getSpringFactoriesInstances(
              ApplicationContextInitializer.class));
      setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));
      this.mainApplicationClass = deduceMainApplicationClass();
  }
  

  SpringApplication#run

  public ConfigurableApplicationContext run(String... args) {
      StopWatch stopWatch = new StopWatch();
      stopWatch.start();
      ConfigurableApplicationContext context = null;
      FailureAnalyzers analyzers = null;
      configureHeadlessProperty();
      SpringApplicationRunListeners listeners = getRunListeners(args);
      listeners.starting();
      try {
          ApplicationArguments applicationArguments = new DefaultApplicationArguments(
                  args);
          ConfigurableEnvironment environment = prepareEnvironment(listeners,
                  applicationArguments);
          Banner printedBanner = printBanner(environment);
          context = createApplicationContext();
          analyzers = new FailureAnalyzers(context);
          prepareContext(context, environment, listeners, applicationArguments,
                  printedBanner);
          refreshContext(context);
          afterRefresh(context, applicationArguments);
          listeners.finished(context, null);
          stopWatch.stop();
          if (this.logStartupInfo) {
              new StartupInfoLogger(this.mainApplicationClass)
                      .logStarted(getApplicationLog(), stopWatch);
          }
          return context;
      }
      catch (Throwable ex) {
          handleRunFailure(context, listeners, analyzers, ex);
          throw new IllegalStateException(ex);
      }
  }
  

自动装配 #

Reference #

• https://blog.csdn.net/weixin_44947701/article/details/124055713