5.SpringBoot核心源码-启动类源码分析

概述

  SpringBoot核心源码-启动类源码分析

技巧

  如何给外部源码加注释，想要在源码中添加自己的注释，会弹出 file is read only，代码只读

方式一：下载框架源码，安装对应的环境，编译，然后即可注释修改保存方式二：idea插件 private notes ，不影响调试，方便简单

spring boot 如何启动应用程序

run方法里面核心逻辑 SpringApplicaiton.run(xxx.class,args)

# org.springframework.boot.SpringApplication#SpringApplication(org.springframework.core.io.ResourceLoader, java.lang.Class<?>...) public SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) { this.resourceLoader = resourceLoader; Assert.notNull(primarySources, "PrimarySources must not be null"); # 存储项目启动类 this.primarySources = new LinkedHashSet<>(Arrays.asList(primarySources)); // 判断应用是servlet还是reactive应用 this.webApplicationType = WebApplicationType.deduceFromClasspath(); // 从spring.factories中读取key为Bootstrap this.bootstrapRegistryInitializers = new ArrayList<>( getSpringFactoriesInstances(BootstrapRegistryInitializer.class)); // 设置初始化器 setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class)); // 设置监听器 setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class)); // 推断并配置项目main函数的主程序启动类 this.mainApplicationClass = deduceMainApplicationClass(); } 123456789101112131415161718 public ConfigurableApplicationContext run(String... args) { Startup startup = Startup.create(); if (this.registerShutdownHook) { SpringApplication.shutdownHook.enableShutdownHookAddition(); } DefaultBootstrapContext bootstrapContext = createBootstrapContext(); ConfigurableApplicationContext context = null; configureHeadlessProperty(); SpringApplicationRunListeners listeners = getRunListeners(args); listeners.starting(bootstrapContext, this.mainApplicationClass); try { ApplicationArguments applicationArguments = new DefaultApplicationArguments(args); ConfigurableEnvironment environment = prepareEnvironment(listeners, bootstrapContext, applicationArguments); Banner printedBanner = printBanner(environment); context = createApplicationContext(); context.setApplicationStartup(this.applicationStartup); prepareContext(bootstrapContext, context, environment, listeners, applicationArguments, printedBanner); refreshContext(context); afterRefresh(context, applicationArguments); startup.started(); if (this.logStartupInfo) { new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), startup); } listeners.started(context, startup.timeTakenToStarted()); callRunners(context, applicationArguments); } catch (Throwable ex) { throw handleRunFailure(context, ex, listeners); } try { if (context.isRunning()) { listeners.ready(context, startup.ready()); } } catch (Throwable ex) { throw handleRunFailure(context, ex, null); } return context; } 123456789101112131415161718192021222324252627282930313233343536373839

结束