springboot内嵌tomcat的jar包启动流程

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调用SpringApplication.run

org.springframework.boot.SpringApplication#run(java.lang.Class<?>, java.lang.String...)
org.springframework.boot.SpringApplication#run(java.lang.Class<?>[], java.lang.String[])new SpringApplication(primarySources).run(args)
// 创建sprignApplication
org.springframework.boot.SpringApplication#SpringApplicationpublic SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) {this.resourceLoader = resourceLoader;Assert.notNull(primarySources, "PrimarySources must not be null");// 保存传入的主配置类this.primarySources = new LinkedHashSet<>(Arrays.asList(primarySources));// 根据运行环境决定webApplicationTypethis.webApplicationType = deduceWebApplicationType();// 去meta-inf/spring.factories文件找ApplicationContextInitializer并保存下来setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));// 去meta-inf/spring.factories文件找ApplicationListener并保存下来setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));// 决定主配置类this.mainApplicationClass = deduceMainApplicationClass();
}
// 根据运行环境决定webApplicationType
private WebApplicationType deduceWebApplicationType() {// 响应式应用if (ClassUtils.isPresent(REACTIVE_WEB_ENVIRONMENT_CLASS, null)&& !ClassUtils.isPresent(MVC_WEB_ENVIRONMENT_CLASS, null)) {return WebApplicationType.REACTIVE;}// 普通工程for (String className : WEB_ENVIRONMENT_CLASSES) {if (!ClassUtils.isPresent(className, null)) {return WebApplicationType.NONE;}}// web工程(这里会返回这个)return WebApplicationType.SERVLET;
}
// SpringApplication对象创建成功后调用run方法
org.springframework.boot.SpringApplication#run(java.lang.String...)public ConfigurableApplicationContext run(String... args) {StopWatchstopWatch = new StopWatch();stopWatch.start();ConfigurableApplicationContext context = null;Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();configureHeadlessProperty();// 去meta-inf/spring.factories文件找SpringApplicationRunListener并保存下来SpringApplicationRunListeners listeners = getRunListeners(args);// 循环调用listener的starting方法listeners.starting();try {// 把main函数参数封装起来ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);// 准备环境ConfigurableEnvironment environment = prepareEnvironment(listeners,applicationArguments);configureIgnoreBeanInfo(environment);// 打印springboot bannerBanner printedBanner = printBanner(environment);// 根据当前运行环境创建容器context = createApplicationContext();// 去meta-inf/spring.factories文件找SpringBootExceptionReporterexceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter.class,new Class[] { ConfigurableApplicationContext.class }, context);// 容器预准备prepareContext(context, environment, listeners, applicationArguments,printedBanner);// 刷新容器,springioc容器在这里初始化加载的refreshContext(context);afterRefresh(context, applicationArguments);stopWatch.stop();if (this.logStartupInfo) {new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);}listeners.started(context);callRunners(context, applicationArguments);}catch (Throwable ex) {handleRunFailure(context, ex, exceptionReporters, listeners);throw new IllegalStateException(ex);}try {listeners.running(context);}catch (Throwable ex) {handleRunFailure(context, ex, exceptionReporters, null);throw new IllegalStateException(ex);}return context;
}org.springframework.boot.SpringApplication#prepareEnvironmentprivate ConfigurableEnvironment prepareEnvironment(SpringApplicationRunListeners listeners,ApplicationArguments applicationArguments) {// 创建或获取一个环境ConfigurableEnvironment environment = getOrCreateEnvironment();// 配置环境configureEnvironment(environment, applicationArguments.getSourceArgs());// 循环调用environmentPrepared环境预准备方法listeners.environmentPrepared(environment);// 把环境绑定到springApplication对象上bindToSpringApplication(environment);if (this.webApplicationType == WebApplicationType.NONE) {environment = new EnvironmentConverter(getClassLoader()).convertToStandardEnvironmentIfNecessary(environment);}ConfigurationPropertySources.attach(environment);return environment;
}private void prepareContext(ConfigurableApplicationContext context,ConfigurableEnvironment environment, SpringApplicationRunListeners listeners,ApplicationArguments applicationArguments, Banner printedBanner) {// 环境设置到容器中context.setEnvironment(environment);postProcessApplicationContext(context);// 调用容器初始化applyInitializers(context);// 循环listener调用contextPrepared容器预处理listeners.contextPrepared(context);if (this.logStartupInfo) {logStartupInfo(context.getParent() == null);logStartupProfileInfo(context);}// Add boot specific singleton beans(添加springboot独有的单实例bean)context.getBeanFactory().registerSingleton("springApplicationArguments",applicationArguments);if (printedBanner != null) {context.getBeanFactory().registerSingleton("springBootBanner", printedBanner);}// Load the sourcesSet<Object> sources = getAllSources();Assert.notEmpty(sources, "Sources must not be empty");load(context, sources.toArray(new Object[0]));// 循环调用listener的contextLoaded发布事件listeners.contextLoaded(context);
}org.springframework.boot.SpringApplication#refreshContext
org.springframework.boot.SpringApplication#refresh
// 到这里就很明显是之前讲ioc时讲到的方法
org.springframework.context.support.AbstractApplicationContext#refresh
// 调用onfresh,之前说过这个方法spring没做任何事情,但是springboot中有用到
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext#onRefresh
// 创建web容器
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext#createWebServerprivate void createWebServer() {WebServer webServer = this.webServer;ServletContext servletContext = getServletContext();if (webServer == null && servletContext == null) {// 获取web容器工厂,即获取tomcatServletWebServerFactoryServletWebServerFactory factory = getWebServerFactory();// 使用web容器工厂创建容器this.webServer = factory.getWebServer(getSelfInitializer());}else if (servletContext != null) {try {getSelfInitializer().onStartup(servletContext);}catch (ServletException ex) {throw new ApplicationContextException("Cannot initialize servlet context",ex);}}initPropertySources();
}org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory#getWebServerpublic WebServer getWebServer(ServletContextInitializer... initializers) {// 创建一个tomcatTomcat tomcat = new Tomcat();/** 设置tomcat的各项属性*/File baseDir = (this.baseDirectory != null ? this.baseDirectory: createTempDir("tomcat"));tomcat.setBaseDir(baseDir.getAbsolutePath());Connector connector = new Connector(this.protocol);tomcat.getService().addConnector(connector);customizeConnector(connector);tomcat.setConnector(connector);tomcat.getHost().setAutoDeploy(false);configureEngine(tomcat.getEngine());for (Connector additionalConnector : this.additionalTomcatConnectors) {tomcat.getService().addConnector(additionalConnector);}prepareContext(tomcat.getHost(), initializers);return getTomcatWebServer(tomcat);
}org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory#getTomcatWebServer
org.springframework.boot.web.embedded.tomcat.TomcatWebServer#TomcatWebServer(org.apache.catalina.startup.Tomcat, boolean)
org.springframework.boot.web.embedded.tomcat.TomcatWebServer#initializeprivate void initialize() throws WebServerException {TomcatWebServer.logger.info("Tomcat initialized with port(s): " + getPortsDescription(false));synchronized (this.monitor) {try {addInstanceIdToEngineName();Context context = findContext();context.addLifecycleListener((event) -> {if (context.equals(event.getSource())&& Lifecycle.START_EVENT.equals(event.getType())) {// Remove service connectors so that protocol binding doesn't// happen when the service is started.removeServiceConnectors();}});// 启动tomcatthis.tomcat.start();// We can re-throw failure exception directly in the main threadrethrowDeferredStartupExceptions();try {ContextBindings.bindClassLoader(context, context.getNamingToken(),getClass().getClassLoader());}catch (NamingException ex) {// Naming is not enabled. Continue}// 启动阻塞的非守护线程来阻塞tomcatstartDaemonAwaitThread();}catch (Exception ex) {stopSilently();throw new WebServerException("Unable to start embedded Tomcat", ex);}}
}

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