啟動過程
1、springboot的入口程式
java
@SpringBootApplication
public class SpringbootApplication {
public static void main(String[] args) {
SpringApplication。run(SpringbootApplication。class, args);
}
}
當程式開始執行之後,會呼叫SpringApplication的構造方法,進行某些初始引數的設定
java
//建立一個新的例項,這個應用程式的上下文將要從指定的來源載入Bean
public SpringApplication(ResourceLoader resourceLoader, Class<?>。。。 primarySources) {
//資源初始化資源載入器,預設為null
this。resourceLoader = resourceLoader;
//斷言主要載入資源類不能為 null,否則報錯
Assert。notNull(primarySources, “PrimarySources must not be null”);
//初始化主要載入資源類集合並去重
this。primarySources = new LinkedHashSet<>(Arrays。asList(primarySources));
//推斷當前 WEB 應用型別,一共有三種:NONE,SERVLET,REACTIVE
this。webApplicationType = WebApplicationType。deduceFromClasspath();
//設定應用上線文初始化器,從“META-INF/spring。factories”讀取ApplicationContextInitializer類的例項名稱集合並去重,並進行set去重。(一共7個)
setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer。class));
//設定監聽器,從“META-INF/spring。factories”讀取ApplicationListener類的例項名稱集合並去重,並進行set去重。(一共11個)
setListeners((Collection) getSpringFactoriesInstances(ApplicationListener。class));
//推斷主入口應用類,通過當前呼叫棧,獲取Main方法所在類,並賦值給mainApplicationClass
this。mainApplicationClass = deduceMainApplicationClass();
}
在上述構造方法中,有一個判斷應用型別的方法,用來判斷當前應用程式的型別:
java
static WebApplicationType deduceFromClasspath() {
if (ClassUtils。isPresent(WEBFLUX_INDICATOR_CLASS, null) && !ClassUtils。isPresent(WEBMVC_INDICATOR_CLASS, null)
&& !ClassUtils。isPresent(JERSEY_INDICATOR_CLASS, null)) {
return WebApplicationType。REACTIVE;
}
for (String className : SERVLET_INDICATOR_CLASSES) {
if (!ClassUtils。isPresent(className, null)) {
return WebApplicationType。NONE;
}
}
return WebApplicationType。SERVLET;
}
//WebApplicationType的型別
public enum WebApplicationType {
/**
* The application should not run as a web application and should not start an
* embedded web server。
* 非web專案
*/
NONE,
/**
* The application should run as a servlet-based web application and should start an
* embedded servlet web server。
* servlet web 專案
*/
SERVLET,
/**
* The application should run as a reactive web application and should start an
* embedded reactive web server。
* 響應式 web 專案
*/
REACTIVE;
springboot啟動的執行方法,可以看到主要是各種執行環境的準備工作
java
public ConfigurableApplicationContext run(String。。。 args) {
//1、建立並啟動計時監控類
StopWatch stopWatch = new StopWatch();
stopWatch。start();
//2、初始化應用上下文和異常報告集合
ConfigurableApplicationContext context = null;
Collection
//3、設定系統屬性“java。awt。headless”的值,預設為true,用於執行headless伺服器,進行簡單的影象處理,多用於在缺少顯示屏、鍵盤或者滑鼠時的系統配置,很多監控工具如jconsole 需要將該值設定為true
configureHeadlessProperty();
//4、建立所有spring執行監聽器併發布應用啟動事件,簡單說的話就是獲取SpringApplicationRunListener型別的例項(EventPublishingRunListener物件),並封裝進SpringApplicationRunListeners物件,然後返回這個SpringApplicationRunListeners物件。說的再簡單點,getRunListeners就是準備好了執行時監聽器EventPublishingRunListener。
SpringApplicationRunListeners listeners = getRunListeners(args);
listeners。starting();
try {
//5、初始化預設應用引數類
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
//6、根據執行監聽器和應用引數來準備spring環境
ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments);
//將要忽略的bean的引數開啟
configureIgnoreBeanInfo(environment);
//7、建立banner列印類
Banner printedBanner = printBanner(environment);
//8、建立應用上下文,可以理解為建立一個容器
context = createApplicationContext();
//9、準備異常報告器,用來支援報告關於啟動的錯誤
exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter。class,
new Class[] { ConfigurableApplicationContext。class }, context);
//10、準備應用上下文,該步驟包含一個非常關鍵的操作,將啟動類注入容器,為後續開啟自動化提供基礎
prepareContext(context, environment, listeners, applicationArguments, printedBanner);
//11、重新整理應用上下文
refreshContext(context);
//12、應用上下文重新整理後置處理,做一些擴充套件功能
afterRefresh(context, applicationArguments);
//13、停止計時監控類
stopWatch。stop();
//14、輸出日誌記錄執行主類名、時間資訊
if (this。logStartupInfo) {
new StartupInfoLogger(this。mainApplicationClass)。logStarted(getApplicationLog(), stopWatch);
}
//15、釋出應用上下文啟動監聽事件
listeners。started(context);
//16、執行所有的Runner執行器
callRunners(context, applicationArguments);
}catch (Throwable ex) {
handleRunFailure(context, ex, exceptionReporters, listeners);
throw new IllegalStateException(ex);
}
try {
//17、釋出應用上下文就緒事件
listeners。running(context);
}catch (Throwable ex) {
handleRunFailure(context, ex, exceptionReporters, null);
throw new IllegalStateException(ex);
}
//18、返回應用上下文
return context;
}
下面詳細介紹各個啟動的環節:
1、建立並啟動計時監控類,可以看到記錄當前任務的名稱,預設是空字串,然後記錄當前springboot應用啟動的開始時間。
java
StopWatch stopWatch = new StopWatch();
stopWatch。start();
//詳細原始碼
public void start() throws IllegalStateException {
start(“”);
}
public void start(String taskName) throws IllegalStateException {
if (this。currentTaskName != null) {
throw new IllegalStateException(“Can‘t start StopWatch: it’s already running”);
}
this。currentTaskName = taskName;
this。startTimeNanos = System。nanoTime();
}
2、初始化應用上下文和異常報告集合
java
ConfigurableApplicationContext context = null;
Collection
3、設定系統屬性java。awt。headless的值:
java
/*
java。awt。headless模式是在缺少顯示屏、鍵盤或者滑鼠的系統配置
當配置瞭如下屬性之後,應用程式可以執行如下操作:
1、建立輕量級元件
2、收集關於可用的字型、字型指標和字型設定的資訊
3、設定顏色來渲染準備圖片
4、創造和獲取影象,為渲染準備圖片
5、使用java。awt。PrintJob,java。awt。print。*和javax。print。*類裡的方法進行列印
*/
private void configureHeadlessProperty() {
System。setProperty(SYSTEM_PROPERTY_JAVA_AWT_HEADLESS,
System。getProperty(SYSTEM_PROPERTY_JAVA_AWT_HEADLESS, Boolean。toString(this。headless)));
}
4、建立所有spring執行監聽器併發布應用啟動事件
java
SpringApplicationRunListeners listeners = getRunListeners(args);
listeners。starting();
//建立spring監聽器
private SpringApplicationRunListeners getRunListeners(String[] args) {
Class<?>[] types = new Class<?>[] { SpringApplication。class, String[]。class };
return new SpringApplicationRunListeners(logger,
getSpringFactoriesInstances(SpringApplicationRunListener。class, types, this, args));
}
SpringApplicationRunListeners(Log log, Collection<? extends SpringApplicationRunListener> listeners) {
this。log = log;
this。listeners = new ArrayList<>(listeners);
}
//迴圈遍歷獲取監聽器
void starting() {
for (SpringApplicationRunListener listener : this。listeners) {
listener。starting();
}
}
//此處的監聽器可以看出是事件釋出監聽器,主要用來發布啟動事件
@Override
public void starting() {
//這裡是建立application事件‘applicationStartingEvent’
this。initialMulticaster。multicastEvent(new ApplicationStartingEvent(this。application, this。args));
}
//applicationStartingEvent是springboot框架最早執行的監聽器,在該監聽器執行started方法時,會繼續釋出事件,主要是基於spring的事件機制
@Override
public void multicastEvent(final ApplicationEvent event, @Nullable ResolvableType eventType) {
ResolvableType type = (eventType != null ? eventType : resolveDefaultEventType(event));
//獲取執行緒池,如果為空則同步處理。這裡執行緒池為空,還未初始化
Executor executor = getTaskExecutor();
for (ApplicationListener<?> listener : getApplicationListeners(event, type)) {
if (executor != null) {
//非同步傳送事件
executor。execute(() -> invokeListener(listener, event));
}
else {
//同步傳送事件
invokeListener(listener, event);
}
}
}
5、初始化預設應用引數類
java
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
public DefaultApplicationArguments(String。。。 args) {
Assert。notNull(args, “Args must not be null”);
this。source = new Source(args);
this。args = args;
}
6、根據執行監聽器和應用引數來準備spring環境
java
ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments);
//詳細環境的準備
private ConfigurableEnvironment prepareEnvironment(SpringApplicationRunListeners listeners,
ApplicationArguments applicationArguments) {
// 獲取或者建立應用環境
ConfigurableEnvironment environment = getOrCreateEnvironment();
// 配置應用環境,配置propertySource和activeProfiles
configureEnvironment(environment, applicationArguments。getSourceArgs());
//listeners環境準備,廣播ApplicationEnvironmentPreparedEvent
ConfigurationPropertySources。attach(environment);
listeners。environmentPrepared(environment);
//將環境繫結給當前應用程式
bindToSpringApplication(environment);
//對當前的環境型別進行判斷,如果不一致進行轉換
if (!this。isCustomEnvironment) {
environment = new EnvironmentConverter(getClassLoader())。convertEnvironmentIfNecessary(environment,
deduceEnvironmentClass());
}
//配置propertySource對它自己的遞迴依賴
ConfigurationPropertySources。attach(environment);
return environment;
}
// 獲取或者建立應用環境,根據應用程式的型別可以分為servlet環境、標準環境(特殊的非web環境)和響應式環境
private ConfigurableEnvironment getOrCreateEnvironment() {
//存在則直接返回
if (this。environment != null) {
return this。environment;
}
//根據webApplicationType建立對應的Environment
switch (this。webApplicationType) {
case SERVLET:
return new StandardServletEnvironment();
case REACTIVE:
return new StandardReactiveWebEnvironment();
default:
return new StandardEnvironment();
}
}
//配置應用環境
protected void configureEnvironment(ConfigurableEnvironment environment, String[] args) {
if (this。addConversionService) {
ConversionService conversionService = ApplicationConversionService。getSharedInstance();
environment。setConversionService((ConfigurableConversionService) conversionService);
}
//配置property sources
configurePropertySources(environment, args);
//配置profiles
configureProfiles(environment, args);
}
7、建立banner的列印類
java
Banner printedBanner = printBanner(environment);
//列印類的詳細操作過程
private Banner printBanner(ConfigurableEnvironment environment) {
if (this。bannerMode == Banner。Mode。OFF) {
return null;
}
ResourceLoader resourceLoader = (this。resourceLoader != null) ? this。resourceLoader
: new DefaultResourceLoader(getClassLoader());
SpringApplicationBannerPrinter bannerPrinter = new SpringApplicationBannerPrinter(resourceLoader, this。banner);
if (this。bannerMode == Mode。LOG) {
return bannerPrinter。print(environment, this。mainApplicationClass, logger);
}
return bannerPrinter。print(environment, this。mainApplicationClass, System。out);
}
8、建立應用的上下文:根據不同哦那個的應用型別初始化不同的上下文應用類
java
context = createApplicationContext();
protected ConfigurableApplicationContext createApplicationContext() {
Class<?> contextClass = this。applicationContextClass;
if (contextClass == null) {
try {
switch (this。webApplicationType) {
case SERVLET:
contextClass = Class。forName(DEFAULT_SERVLET_WEB_CONTEXT_CLASS);
break;
case REACTIVE:
contextClass = Class。forName(DEFAULT_REACTIVE_WEB_CONTEXT_CLASS);
break;
default:
contextClass = Class。forName(DEFAULT_CONTEXT_CLASS);
}
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException(
“Unable create a default ApplicationContext, please specify an ApplicationContextClass”, ex);
}
}
return (ConfigurableApplicationContext) BeanUtils。instantiateClass(contextClass);
}
9、準備異常報告器
java
exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter。class,
new Class[] { ConfigurableApplicationContext。class }, context);
private
ClassLoader classLoader = getClassLoader();
// Use names and ensure unique to protect against duplicates
Set
List
AnnotationAwareOrderComparator。sort(instances);
return instances;
}
10、準備應用上下文
java
prepareContext(context, environment, listeners, applicationArguments, printedBanner);
private void prepareContext(ConfigurableApplicationContext context, ConfigurableEnvironment environment,
SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner) {
//應用上下文的environment
context。setEnvironment(environment);
//應用上下文後處理
postProcessApplicationContext(context);
//為上下文應用所有初始化器,執行容器中的applicationContextInitializer(spring。factories的例項),將所有的初始化物件放置到context物件中
applyInitializers(context);
//觸發所有SpringApplicationRunListener監聽器的ContextPrepared事件方法。新增所有的事件監聽器
listeners。contextPrepared(context);
//記錄啟動日誌
if (this。logStartupInfo) {
logStartupInfo(context。getParent() == null);
logStartupProfileInfo(context);
}
// 註冊啟動引數bean,將容器指定的引數封裝成bean,注入容器
ConfigurableListableBeanFactory beanFactory = context。getBeanFactory();
beanFactory。registerSingleton(“springApplicationArguments”, applicationArguments);
//設定banner
if (printedBanner != null) {
beanFactory。registerSingleton(“springBootBanner”, printedBanner);
}
if (beanFactory instanceof DefaultListableBeanFactory) {
((DefaultListableBeanFactory) beanFactory)
。setAllowBeanDefinitionOverriding(this。allowBeanDefinitionOverriding);
}
if (this。lazyInitialization) {
context。addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor());
}
// 載入所有資源,指的是啟動器指定的引數
Set
Assert。notEmpty(sources, “Sources must not be empty”);
//將bean載入到上下文中
load(context, sources。toArray(new Object[0]));
//觸發所有springapplicationRunListener監聽器的contextLoaded事件方法,
listeners。contextLoaded(context);
}
——————————-
//這裡沒有做任何的處理過程,因為beanNameGenerator和resourceLoader預設為空,可以方便後續做擴充套件處理
protected void postProcessApplicationContext(ConfigurableApplicationContext context) {
if (this。beanNameGenerator != null) {
context。getBeanFactory()。registerSingleton(AnnotationConfigUtils。CONFIGURATION_BEAN_NAME_GENERATOR,
this。beanNameGenerator);
}
if (this。resourceLoader != null) {
if (context instanceof GenericApplicationContext) {
((GenericApplicationContext) context)。setResourceLoader(this。resourceLoader);
}
if (context instanceof DefaultResourceLoader) {
((DefaultResourceLoader) context)。setClassLoader(this。resourceLoader。getClassLoader());
}
}
if (this。addConversionService) {
context。getBeanFactory()。setConversionService(ApplicationConversionService。getSharedInstance());
}
}
——————————-
//將啟動器類載入到spring容器中,為後續的自動化配置奠定基礎,之前看到的很多註解也與此相關
protected void load(ApplicationContext context, Object[] sources) {
if (logger。isDebugEnabled()) {
logger。debug(“Loading source ” + StringUtils。arrayToCommaDelimitedString(sources));
}
BeanDefinitionLoader loader = createBeanDefinitionLoader(getBeanDefinitionRegistry(context), sources);
if (this。beanNameGenerator != null) {
loader。setBeanNameGenerator(this。beanNameGenerator);
}
if (this。resourceLoader != null) {
loader。setResourceLoader(this。resourceLoader);
}
if (this。environment != null) {
loader。setEnvironment(this。environment);
}
loader。load();
}
——————————-
//springboot會優先選擇groovy載入方式,找不到在選擇java方式
private int load(Class<?> source) {
if (isGroovyPresent() && GroovyBeanDefinitionSource。class。isAssignableFrom(source)) {
// Any GroovyLoaders added in beans{} DSL can contribute beans here
GroovyBeanDefinitionSource loader = BeanUtils。instantiateClass(source, GroovyBeanDefinitionSource。class);
load(loader);
}
if (isComponent(source)) {
this。annotatedReader。register(source);
return 1;
}
return 0;
}
11、重新整理應用上下文
java
refreshContext(context);
private void refreshContext(ConfigurableApplicationContext context) {
refresh(context);
if (this。registerShutdownHook) {
try {
context。registerShutdownHook();
}
catch (AccessControlException ex) {
// Not allowed in some environments。
}
}
}
——————
public void refresh() throws BeansException, IllegalStateException {
synchronized (this。startupShutdownMonitor) {
// Prepare this context for refreshing。
//重新整理上下文環境,初始化上下文環境,對系統的環境變數或者系統屬性進行準備和校驗
prepareRefresh();
// Tell the subclass to refresh the internal bean factory。
//初始化beanfactory,解析xml,相當於之前的xmlBeanfactory操作
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
// Prepare the bean factory for use in this context。
//為上下文準備beanfactory,對beanFactory的各種功能進行填充,如@autowired,設定spel表示式解析器,設定編輯註冊器,新增applicationContextAwareprocessor處理器等等
prepareBeanFactory(beanFactory);
try {
// Allows post-processing of the bean factory in context subclasses。
//提供子類覆蓋的額外處理,即子類處理自定義的beanfactorypostProcess
postProcessBeanFactory(beanFactory);
// Invoke factory processors registered as beans in the context。
//啟用各種beanfactory處理器
invokeBeanFactoryPostProcessors(beanFactory);
// Register bean processors that intercept bean creation。
//註冊攔截bean建立的bean處理器,即註冊beanPostProcessor
registerBeanPostProcessors(beanFactory);
// Initialize message source for this context。
//初始化上下文中的資原始檔如國際化檔案的處理
initMessageSource();
// Initialize event multicaster for this context。
//初始化上下文事件廣播器
initApplicationEventMulticaster();
// Initialize other special beans in specific context subclasses。
//給子類擴充套件初始化其他bean
onRefresh();
// Check for listener beans and register them。
//在所有的bean中查詢listener bean,然後 註冊到廣播器中
registerListeners();
// Instantiate all remaining (non-lazy-init) singletons。
//初始化剩餘的非懶惰的bean,即初始化非延遲載入的bean
finishBeanFactoryInitialization(beanFactory);
// Last step: publish corresponding event。
//發完成重新整理過程,通知宣告週期處理器重新整理過程,同時發出ContextRefreshEvent通知別人
finishRefresh();
}
catch (BeansException ex) {
if (logger。isWarnEnabled()) {
logger。warn(“Exception encountered during context initialization - ” +
“cancelling refresh attempt: ” + ex);
}
// Destroy already created singletons to avoid dangling resources。
destroyBeans();
// Reset ‘active’ flag。
cancelRefresh(ex);
// Propagate exception to caller。
throw ex;
}
finally {
// Reset common introspection caches in Spring‘s core, since we
// might not ever need metadata for singleton beans anymore。。。
resetCommonCaches();
}
}
}
12、應用上下文重新整理後置處理
java
afterRefresh(context, applicationArguments);
//當前方法的程式碼是空的,可以做一些自定義的後置處理操作
protected void afterRefresh(ConfigurableApplicationContext context, ApplicationArguments args) {
}
13、停止計時監控類:計時監聽器停止,並統計一些任務執行資訊
java
stopWatch。stop();
public void stop() throws IllegalStateException {
if (this。currentTaskName == null) {
throw new IllegalStateException(“Can’t stop StopWatch: it‘s not running”);
}
long lastTime = System。nanoTime() - this。startTimeNanos;
this。totalTimeNanos += lastTime;
this。lastTaskInfo = new TaskInfo(this。currentTaskName, lastTime);
if (this。keepTaskList) {
this。taskList。add(this。lastTaskInfo);
}
++this。taskCount;
this。currentTaskName = null;
}
14、輸出日誌記錄執行主類名、時間資訊
java
if (this。logStartupInfo) {
new StartupInfoLogger(this。mainApplicationClass)。logStarted(getApplicationLog(), stopWatch);
}
15、釋出應用上下文啟動完成事件:觸發所有SpringapplicationRunListener監聽器的started事件方法
java
listeners。started(context);
void started(ConfigurableApplicationContext context) {
for (SpringApplicationRunListener listener : this。listeners) {
listener。started(context);
}
}
16、執行所有Runner執行器:執行所有applicationRunner和CommandLineRunner兩種執行器
java
callRunners(context, applicationArguments);
private void callRunners(ApplicationContext context, ApplicationArguments args) {
List
runners。addAll(context。getBeansOfType(ApplicationRunner。class)。values());
runners。addAll(context。getBeansOfType(CommandLineRunner。class)。values());
AnnotationAwareOrderComparator。sort(runners);
for (Object runner : new LinkedHashSet<>(runners)) {
if (runner instanceof ApplicationRunner) {
callRunner((ApplicationRunner) runner, args);
}
if (runner instanceof CommandLineRunner) {
callRunner((CommandLineRunner) runner, args);
}
}
}
17、釋出應用上下文就緒事件:觸發所有springapplicationRunnListener將挺起的running事件方法
java
listeners。running(context);
void running(ConfigurableApplicationContext context) {
for (SpringApplicationRunListener listener : this。listeners) {
listener。running(context);
}
}
18、返回應用上下文
java
return context;
————————————————————————————————————-
注意:
整個springboot框架中獲取factorys檔案的方式統一如下:
java
private
return getSpringFactoriesInstances(type, new Class<?>[] {});
}
——————————————————-
private
ClassLoader classLoader = getClassLoader();
// Use names and ensure unique to protect against duplicates
Set
List
AnnotationAwareOrderComparator。sort(instances);
return instances;
}
——————————————-
public static List
String factoryTypeName = factoryType。getName();
return loadSpringFactories(classLoader)。getOrDefault(factoryTypeName, Collections。emptyList());
}
private static Map
MultiValueMap
if (result != null) {
return result;
}
try {
Enumeration
classLoader。getResources(FACTORIES_RESOURCE_LOCATION) :
ClassLoader。getSystemResources(FACTORIES_RESOURCE_LOCATION));
result = new LinkedMultiValueMap<>();
while (urls。hasMoreElements()) {
URL url = urls。nextElement();
UrlResource resource = new UrlResource(url);
Properties properties = PropertiesLoaderUtils。loadProperties(resource);
for (Map。Entry<?, ?> entry : properties。entrySet()) {
String factoryTypeName = ((String) entry。getKey())。trim();
for (String factoryImplementationName : StringUtils。commaDelimitedListToStringArray((String) entry。getValue())) {
result。add(factoryTypeName, factoryImplementationName。trim());
}
}
}
cache。put(classLoader, result);
return result;
}
catch (IOException ex) {
throw new IllegalArgumentException(“Unable to load factories from location [” +
FACTORIES_RESOURCE_LOCATION + “]”, ex);
}
}
————————————-
private
ClassLoader classLoader, Object[] args, Set
List
for (String name : names) {
try {
//裝載class檔案到記憶體
Class<?> instanceClass = ClassUtils。forName(name, classLoader);
Assert。isAssignable(type, instanceClass);
Constructor<?> constructor = instanceClass。getDeclaredConstructor(parameterTypes);
//透過反射建立例項
T instance = (T) BeanUtils。instantiateClass(constructor, args);
instances。add(instance);
}
catch (Throwable ex) {
throw new IllegalArgumentException(“Cannot instantiate ” + type + “ : ” + name, ex);
}
}
return instances;
}
spring。factory檔案中的類的作用:
properties
# PropertySource Loaders 屬性檔案載入器
org。springframework。boot。env。PropertySourceLoader=\
# properties檔案載入器
org。springframework。boot。env。PropertiesPropertySourceLoader,\
# yaml檔案載入器
org。springframework。boot。env。YamlPropertySourceLoader
# Run Listeners 執行時的監聽器
org。springframework。boot。SpringApplicationRunListener=\
# 程式執行過程中所有監聽通知都是透過此類來進行回撥
org。springframework。boot。context。event。EventPublishingRunListener
# Error Reporters 錯誤報告器
org。springframework。boot。SpringBootExceptionReporter=\
org。springframework。boot。diagnostics。FailureAnalyzers
# Application Context Initializers
org。springframework。context。ApplicationContextInitializer=\
# 報告spring容器的一些常見的錯誤配置
org。springframework。boot。context。ConfigurationWarningsApplicationContextInitializer,\
# 設定spring應用上下文的ID
org。springframework。boot。context。ContextIdApplicationContextInitializer,\
# 使用環境屬性context。initializer。classes指定初始化器進行初始化規則
org。springframework。boot。context。config。DelegatingApplicationContextInitializer,\
org。springframework。boot。rsocket。context。RSocketPortInfoApplicationContextInitializer,\
# 將內建servlet容器實際使用的監聽埠寫入到environment環境屬性中
org。springframework。boot。web。context。ServerPortInfoApplicationContextInitializer
# Application Listeners
org。springframework。context。ApplicationListener=\
# 應用上下文載入完成後對快取做清除工作,響應事件ContextRefreshEvent
org。springframework。boot。ClearCachesApplicationListener,\
# 監聽雙親應用上下文的關閉事件並往自己的孩子應用上下文中傳播,相關事件ParentContextAvailableEvent/ContextClosedEvent
org。springframework。boot。builder。ParentContextCloserApplicationListener,\
org。springframework。boot。cloud。CloudFoundryVcapEnvironmentPostProcessor,\
# 如果系統檔案編碼和環境變數中指定的不同則終止應用啟動。具體的方法是比較系統屬性file。encoding和環境變數spring。mandatory-file-encoding是否相等(大小寫不敏感)。
org。springframework。boot。context。FileEncodingApplicationListener,\
# 根據spring。output。ansi。enabled引數配置AnsiOutput
org。springframework。boot。context。config。AnsiOutputApplicationListener,\
# EnvironmentPostProcessor,從常見的那些約定的位置讀取配置檔案,比如從以下目錄讀取#application。properties,application。yml等配置檔案:
# classpath:
# file:。
# classpath:config
# file:。/config/:
# 也可以配置成從其他指定的位置讀取配置檔案
org。springframework。boot。context。config。ConfigFileApplicationListener,\
# 監聽到事件後轉發給環境變數context。listener。classes指定的那些事件監聽器
org。springframework。boot。context。config。DelegatingApplicationListener,\
# 一個SmartApplicationListener,對環境就緒事件ApplicationEnvironmentPreparedEvent/應用失敗事件ApplicationFailedEvent做出響應,往日誌DEBUG級別輸出TCCL(thread context class loader)的classpath。
org。springframework。boot。context。logging。ClasspathLoggingApplicationListener,\
# 檢測正在使用的日誌系統,預設是logback,,此時日誌系統還沒有初始化
org。springframework。boot。context。logging。LoggingApplicationListener,\
# 使用一個可以和Spring Boot可執行jar包配合工作的版本替換liquibase ServiceLocator
org。springframework。boot。liquibase。LiquibaseServiceLocatorApplicationListener
頭條長度受限,可以去開源中國、或者CSDN