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SpringBoot启动应用及回调监听原理解析

2019-12-15 12:08 1376 查看

这篇文章主要介绍了SpringBoot启动应用及回调监听原理解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

主类Main方法

public static void main(String[] args) {
SpringApplication.run(SpringBootRunApplication.class, args);
}

创建SpringApplication对象

public static ConfigurableApplicationContext run(Class<?>[] primarySources, String[] args) {
return (new SpringApplication(primarySources)).run(args);
}

构造器

public SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) {
this.sources = new LinkedHashSet();
this.bannerMode = Mode.CONSOLE;
this.logStartupInfo = true;
this.addCommandLineProperties = true;
this.addConversionService = true;
this.headless = true;
this.registerShutdownHook = true;
this.additionalProfiles = new HashSet();
this.isCustomEnvironment = false;
this.lazyInitialization = false;
this.resourceLoader = resourceLoader;
Assert.notNull(primarySources, "PrimarySources must not be null");
this.primarySources = new LinkedHashSet(Arrays.asList(primarySources));
this.webApplicationType = WebApplicationType.deduceFromClasspath();this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class));
this.setListeners(this.getSpringFactoriesInstances(ApplicationListener.class));
this.mainApplicationClass = this.deduceMainApplicationClass();
}

ApplicationContextInitializer&ApplicationListener

读取META-INF/spring.factories文件中的类　

this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class));
this.setListeners(this.getSpringFactoriesInstances(ApplicationListener.class));

执行run方法　

public ConfigurableApplicationContext run(String... args) {
StopWatch stopWatch = new StopWatch();
stopWatch.start();
// IOC容器
ConfigurableApplicationContext context = null;
Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList();
this.configureHeadlessProperty();
// 读取META-INF/spring.factories文件获得SpringApplicationRunListener的实现类集合
SpringApplicationRunListeners listeners = this.getRunListeners(args);
// 监听开始，回调所有SpringApplicationRunListener的starting()方法
listeners.starting();

Collection exceptionReporters;
try {
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
// 监听配置环境准备好了，回调所有SpringApplicationRunListener的environmentPrepared()方法
ConfigurableEnvironment environment = this.prepareEnvironment(listeners, applicationArguments);
this.configureIgnoreBeanInfo(environment);
Banner printedBanner = this.printBanner(environment);
// 创建IOC容器
context = this.createApplicationContext();
exceptionReporters = this.getSpringFactoriesInstances(SpringBootExceptionReporter.class, new Class[]{ConfigurableApplicationContext.class}, context);
// 回调ApplicationContextInitializer的initialize()方法，回调SpringApplicationRunListener的contextPrepared()方法
// 回调SpringApplicationRunListener的contextLoaded()方法
this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);
// 刷新IOC容器，注入组件
this.refreshContext(context);
this.afterRefresh(context, applicationArguments);
stopWatch.stop();
if (this.logStartupInfo) {
(new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), stopWatch);
}
// 回调SpringApplicationRunListener的started()方法
listeners.started(context);
// 从IOC容器中获得ApplicationRunner、CommandLineRunner的所有组件，回调ApplicationRunner、CommandLineRunner的run()方法
this.callRunners(context, applicationArguments);
} catch (Throwable var10) {
this.handleRunFailure(context, var10, exceptionReporters, listeners);
throw new IllegalStateException(var10);
}

try {
// 回调SpringApplicationRunListener的running()方法
listeners.running(context);
return context;
} catch (Throwable var9) {
this.handleRunFailure(context, var9, exceptionReporters, (SpringApplicationRunListeners)null);
throw new IllegalStateException(var9);
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助

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标签： Spring Boot 启动应用回调监听

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