Springboot start reading the source code, I found Springboot listeners are automatically activated by uopeizhi configuration file, the paper is automatically loaded using Springboot way listeners.
Project Dependencies
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>boot</finalName>
</build>
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项目监听配置
Built META-INF folder in the resource directory, and the folder is created below spring.factories files, which configure the full path of the listener class, the first line is loaded springboot looking key, its configuration can be as follows
org.springframework.context.ApplicationListener=\
boot.Listener.MyListener,\
boot.Listener.DateListener
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boot.Listener.MyListener
package boot.Listener;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
public class MyListener implements ApplicationListener<ApplicationEvent>{
@Override
public void onApplicationEvent(ApplicationEvent paramE) {
System.out.println("--------"+paramE.getClass().getName());
}
}
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all start event for starting a note log
--------**org.springframework.boot.context.event.ApplicationStartedEvent**
--------**org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent**
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.8.RELEASE)
2019-05-21 14:36:56.423 INFO 4120 --- [ main] boot.application : Starting application on LIUJP with PID 4120 (started by Administrator in E:\Program Files\wowkSpace\boot)
2019-05-21 14:36:56.435 INFO 4120 --- [ main] boot.application : No active profile set, falling back to default profiles: default
--------**org.springframework.boot.context.event.ApplicationPreparedEvent**
2019-05-21 14:36:56.718 INFO 4120 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@21a947fe: startup date [Tue May 21 14:36:56 CST 2019]; root of context hierarchy
2019-05-21 14:37:02.015 INFO 4120 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2019-05-21 14:37:02.062 INFO 4120 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-05-21 14:37:02.078 INFO 4120 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2019-05-21 14:37:02.624 INFO 4120 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-05-21 14:37:02.624 INFO 4120 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 5922 ms
2019-05-21 14:37:03.218 INFO 4120 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2019-05-21 14:37:03.235 INFO 4120 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-05-21 14:37:03.251 INFO 4120 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-05-21 14:37:03.251 INFO 4120 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-05-21 14:37:03.251 INFO 4120 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2019-05-21 14:37:04.469 INFO 4120 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@21a947fe: startup date [Tue May 21 14:36:56 CST 2019]; root of context hierarchy
2019-05-21 14:37:04.725 INFO 4120 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2019-05-21 14:37:04.725 INFO 4120 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2019-05-21 14:37:04.835 INFO 4120 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2019-05-21 14:37:04.850 INFO 4120 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2019-05-21 14:37:04.991 INFO 4120 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2019-05-21 14:37:05.491 INFO 4120 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
--------**org.springframework.context.event.ContextRefreshedEvent**
2019-05-21 14:37:05.716 INFO 4120 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
--------**org.springframework.boot.context.embedded.EmbeddedServletContainerInitializedEvent**
--------**org.springframework.boot.context.event.ApplicationReadyEvent**
2019-05-21 14:37:05.732 INFO 4120 --- [ main] boot.application : Started application in 10.546 seconds (JVM running for 11.845)
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above it can be seen Springboot startup time followed
org.springframework .boot.context.event.ApplicationStartedEvent
org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent
org.springframework.boot.context.event.ApplicationPreparedEvent
org.springframework.context.event.ContextRefreshedEvent
org.springframework.boot.context.event.ApplicationReadyEvent
Source monitor
SpringApplication.run(application.class, args);
SpringApplicationRunListeners listeners = getRunListeners(args);
private SpringApplicationRunListeners getRunListeners(String[] args) {
Class<?>[] types = new Class<?>[] { SpringApplication.class, String[].class };
return new SpringApplicationRunListeners(logger, getSpringFactoriesInstances(
SpringApplicationRunListener.class, types, this, args));
}
private <T> Collection<? extends T> getSpringFactoriesInstances(Class<T> type,
Class<?>[] parameterTypes, Object... args) {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
// Use names and ensure unique to protect against duplicates
Set<String> names = new LinkedHashSet<String>(
SpringFactoriesLoader.loadFactoryNames(type, classLoader));
List<T> instances = createSpringFactoriesInstances(type, parameterTypes,
classLoader, args, names);
AnnotationAwareOrderComparator.sort(instances);
return instances;
}
public static final String FACTORIES_RESOURCE_LOCATION = "META-INF/spring.factories";
public static List<String> loadFactoryNames(Class<?> factoryClass, ClassLoader classLoader) {
String factoryClassName = factoryClass.getName();
try {
Enumeration<URL> urls = (classLoader != null ? classLoader.getResources(FACTORIES_RESOURCE_LOCATION) :
ClassLoader.getSystemResources(FACTORIES_RESOURCE_LOCATION));
List<String> result = new ArrayList<String>();
while (urls.hasMoreElements()) {
URL url = urls.nextElement();
Properties properties = PropertiesLoaderUtils.loadProperties(new UrlResource(url));
String factoryClassNames = properties.getProperty(factoryClassName);
result.addAll(Arrays.asList(StringUtils.commaDelimitedListToStringArray(factoryClassNames)));
}
return result;
}
catch (IOException ex) {
throw new IllegalArgumentException("Unable to load [" + factoryClass.getName() +
"] factories from location [" + FACTORIES_RESOURCE_LOCATION + "]", ex);
}
}
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