SpringBoot启动应用及回调监听原理解析
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
publicstaticvoidmain(String[]args){
SpringApplication.run(SpringBootRunApplication.class,args);
}
创建SpringApplication对象
publicstaticConfigurableApplicationContextrun(Class[]primarySources,String[]args){
return(newSpringApplication(primarySources)).run(args);
}
构造器
publicSpringApplication(ResourceLoaderresourceLoader,Class...primarySources){
this.sources=newLinkedHashSet();
this.bannerMode=Mode.CONSOLE;
this.logStartupInfo=true;
this.addCommandLineProperties=true;
this.addConversionService=true;
this.headless=true;
this.registerShutdownHook=true;
this.additionalProfiles=newHashSet();
this.isCustomEnvironment=false;
this.lazyInitialization=false;
this.resourceLoader=resourceLoader;
Assert.notNull(primarySources,"PrimarySourcesmustnotbenull");
this.primarySources=newLinkedHashSet(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
publicConfigurableApplicationContextrun(String...args){
StopWatchstopWatch=newStopWatch();
stopWatch.start();
//IOC容器
ConfigurableApplicationContextcontext=null;
CollectionexceptionReporters=newArrayList();
this.configureHeadlessProperty();
//读取META-INF/spring.factories文件获得SpringApplicationRunListener的实现类集合
SpringApplicationRunListenerslisteners=this.getRunListeners(args);
//监听开始，回调所有SpringApplicationRunListener的starting()方法
listeners.starting();
CollectionexceptionReporters;
try{
ApplicationArgumentsapplicationArguments=newDefaultApplicationArguments(args);
//监听配置环境准备好了，回调所有SpringApplicationRunListener的environmentPrepared()方法
ConfigurableEnvironmentenvironment=this.prepareEnvironment(listeners,applicationArguments);
this.configureIgnoreBeanInfo(environment);
BannerprintedBanner=this.printBanner(environment);
//创建IOC容器
context=this.createApplicationContext();
exceptionReporters=this.getSpringFactoriesInstances(SpringBootExceptionReporter.class,newClass[]{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){
(newStartupInfoLogger(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(Throwablevar10){
this.handleRunFailure(context,var10,exceptionReporters,listeners);
thrownewIllegalStateException(var10);
}
try{
//回调SpringApplicationRunListener的running()方法
listeners.running(context);
returncontext;
}catch(Throwablevar9){
this.handleRunFailure(context,var9,exceptionReporters,(SpringApplicationRunListeners)null);
thrownewIllegalStateException(var9);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。
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