SpringBoot Application事件监听的实现方案

2023-08-22 20:30:06 189

先说结论

SpringBootApplication共支持6种事件监听，按顺序分别是：

ApplicationStartingEvent：在Spring最开始启动的时候触发
ApplicationEnvironmentPreparedEvent：在Spring已经准备好上下文但是上下文尚未创建的时候触发
ApplicationPreparedEvent：在Bean定义加载之后、刷新上下文之前触发
ApplicationStartedEvent：在刷新上下文之后、调用application命令之前触发
ApplicationReadyEvent：在调用applicaiton命令之后触发
ApplicationFailedEvent：在启动Spring发生异常时触发

另外：

ApplicationRunner和CommandLineRunner的执行在第五步和第六步之间
Bean的创建在第三步和第四步之间
在启动类中，执行SpringApplication.run()方法后的代码，会在第六步后执行

再上代码：

ApplicationStartingEvent

publicclassApplicationStartingEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationStartingEventapplicationStartingEvent){
System.out.println("============>>>>>applicationStartingEventistrigged");
System.out.println(applicationStartingEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

ApplicationEnvironmentPreparedEvent

publicclassApplicationEnvironmentPreparedEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationEnvironmentPreparedEventapplicationEnvironmentPreparedEvent){
System.out.println("============>>>>>ApplicationEnvironmentPreparedEventistrigged");
System.out.println(applicationEnvironmentPreparedEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

ApplicationPreparedEvent

publicclassApplicationPreparedEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationPreparedEventapplicationPreparedEvent){
System.out.println("============>>>>>applicationPreparedEventistrigged");
System.out.println(applicationPreparedEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

ApplicationStartedEvent

publicclassApplicationStartedEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationStartedEventapplicationStartedEvent){
System.out.println("============>>>>>applicationStartedEventistrigged");
System.out.println(applicationStartedEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

ApplicationReadyEvent

publicclassApplicationReadyEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationReadyEventapplicationReadyEvent){
System.out.println("============>>>>>applicationReadyEventistrigged");
System.out.println(applicationReadyEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

ApplicationFailedEvent

publicclassApplicationFailedEventListenerimplementsApplicationListener{

@Override
publicvoidonApplicationEvent(ApplicationFailedEventapplicationFailedEvent){
System.out.println("============>>>>>ApplicationFailedEventistrigged");
System.out.println(applicationFailedEvent.getTimestamp());
System.out.println("============>>>>>End");
}
}

主启动类

@SpringBootApplication
publicclassSpringBootTestApplication{

publicstaticvoidmain(String[]args){
SpringApplicationspringApplication=newSpringApplication(SpringBootTestApplication.class);
springApplication.addListeners(newApplicationEnvironmentPreparedEventListener());
springApplication.addListeners(newApplicationFailedEventListener());
springApplication.addListeners(newApplicationPreparedEventListener());
springApplication.addListeners(newApplicationReadyEventListener());
springApplication.addListeners(newApplicationStartedEventListener());
springApplication.addListeners(newApplicationStartingEventListener());
springApplication.run(args);
}
}

运行结果

ConnectedtothetargetVM,address:'127.0.0.1:62927',transport:'socket'
============>>>>>applicationStartingEventistrigged
============>>>>>End
============>>>>>ApplicationEnvironmentPreparedEventistrigged
============>>>>>End

._________
/\\/___'_____(_)______\\\\
(()\___|'_|'_||'_\/_`|\\\\
\\/___)||_)|||||||(_||))))
'|____|.__|_||_|_||_\__,|////
=========|_|==============|___/=/_/_/_/
::SpringBoot::(v2.0.3.RELEASE)

2018-11-0114:52:35.117INFO2044---[main]c.l.s.b.test.SpringBootTestApplication:StartingSpringBootTestApplicationonEDIANZU-ETGVGB5withPID2044(D:\Code\SelfCode\SpringCloud\Test\SpringBootTest\target\classesstartedbyAdministratorinD:\Code\SelfCode\SpringCloud)
2018-11-0114:52:35.122INFO2044---[main]c.l.s.b.test.SpringBootTestApplication:Noactiveprofileset,fallingbacktodefaultprofiles:default
============>>>>>applicationPreparedEventistrigged
============>>>>>End
2018-11-0114:52:35.212INFO2044---[main]ConfigServletWebServerApplicationContext:Refreshingorg.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3406472c:startupdate[ThuNov0114:52:35CST2018];rootofcontexthierarchy
2018-11-0114:52:36.891INFO2044---[main]o.s.b.w.embedded.tomcat.TomcatWebServer:Tomcatinitializedwithport(s):8080(http)
2018-11-0114:52:36.920INFO2044---[main]o.apache.catalina.core.StandardService:Startingservice[Tomcat]
2018-11-0114:52:36.920INFO2044---[main]org.apache.catalina.core.StandardEngine:StartingServletEngine:ApacheTomcat/8.5.31
2018-11-0114:52:36.925INFO2044---[ost-startStop-1]o.a.catalina.core.AprLifecycleListener:TheAPRbasedApacheTomcatNativelibrarywhichallowsoptimalperformanceinproductionenvironmentswasnotfoundonthejava.library.path:[D:\ProgramFiles\Java\jdk1.8.0_191\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\ProgramFiles(x86)\CommonFiles\Oracle\Java\javapath;C:\ProgramFiles(x86)\Intel\iCLSClient\;C:\ProgramFiles\Intel\iCLSClient\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\ProgramFiles(x86)\Intel\Intel(R)ManagementEngineComponents\DAL;C:\ProgramFiles\Intel\Intel(R)ManagementEngineComponents\DAL;C:\ProgramFiles(x86)\Intel\Intel(R)ManagementEngineComponents\IPT;C:\ProgramFiles\Intel\Intel(R)ManagementEngineComponents\IPT;C:\ProgramFiles\Intel\WiFi\bin\;C:\ProgramFiles\CommonFiles\Intel\WirelessCommon\;C:\ProgramFiles\ThinkPad\BluetoothSoftware\;C:\ProgramFiles\ThinkPad\BluetoothSoftware\syswow64;C:\ProgramFiles(x86)\Intel\OpenCLSDK\2.0\bin\x86;C:\ProgramFiles(x86)\Intel\OpenCLSDK\2.0\bin\x64;D:\ProgramFiles\Java\jdk1.8.0_191\bin;D:\ProgramFiles\Git\cmd;D:\ProgramFiles\apache-maven-3.5.4\bin;C:\ProgramFiles\Intel\WiFi\bin\;C:\ProgramFiles\CommonFiles\Intel\WirelessCommon\;.]
2018-11-0114:52:37.048INFO2044---[ost-startStop-1]o.a.c.c.C.[Tomcat].[localhost].[/]:InitializingSpringembeddedWebApplicationContext
2018-11-0114:52:37.048INFO2044---[ost-startStop-1]o.s.web.context.ContextLoader:RootWebApplicationContext:initializationcompletedin1841ms
2018-11-0114:52:37.377INFO2044---[ost-startStop-1]o.s.b.w.servlet.ServletRegistrationBean:ServletdispatcherServletmappedto[/]
2018-11-0114:52:37.389INFO2044---[ost-startStop-1]o.s.b.w.servlet.FilterRegistrationBean:Mappingfilter:'characterEncodingFilter'to:[/*]
2018-11-0114:52:37.390INFO2044---[ost-startStop-1]o.s.b.w.servlet.FilterRegistrationBean:Mappingfilter:'hiddenHttpMethodFilter'to:[/*]
2018-11-0114:52:37.390INFO2044---[ost-startStop-1]o.s.b.w.servlet.FilterRegistrationBean:Mappingfilter:'httpPutFormContentFilter'to:[/*]
2018-11-0114:52:37.390INFO2044---[ost-startStop-1]o.s.b.w.servlet.FilterRegistrationBean:Mappingfilter:'requestContextFilter'to:[/*]
2018-11-0114:52:37.598INFO2044---[main]o.s.w.s.handler.SimpleUrlHandlerMapping:MappedURLpath[/**/favicon.ico]ontohandleroftype[classorg.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-0114:52:37.857INFO2044---[main]s.w.s.m.m.a.RequestMappingHandlerAdapter:Lookingfor@ControllerAdvice:org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3406472c:startupdate[ThuNov0114:52:35CST2018];rootofcontexthierarchy
2018-11-0114:52:37.922INFO2044---[main]s.w.s.m.m.a.RequestMappingHandlerMapping:Mapped"{[/error]}"ontopublicorg.springframework.http.ResponseEntity>org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-11-0114:52:37.923INFO2044---[main]s.w.s.m.m.a.RequestMappingHandlerMapping:Mapped"{[/error],produces=[text/html]}"ontopublicorg.springframework.web.servlet.ModelAndVieworg.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-11-0114:52:37.973INFO2044---[main]o.s.w.s.handler.SimpleUrlHandlerMapping:MappedURLpath[/webjars/**]ontohandleroftype[classorg.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-0114:52:37.973INFO2044---[main]o.s.w.s.handler.SimpleUrlHandlerMapping:MappedURLpath[/**]ontohandleroftype[classorg.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-0114:52:38.160INFO2044---[main]o.s.j.e.a.AnnotationMBeanExporter:RegisteringbeansforJMXexposureonstartup
2018-11-0114:52:38.206INFO2044---[main]o.s.b.w.embedded.tomcat.TomcatWebServer:Tomcatstartedonport(s):8080(http)withcontextpath''
2018-11-0114:52:38.212INFO2044---[main]c.l.s.b.test.SpringBootTestApplication:StartedSpringBootTestApplicationin3.976seconds(JVMrunningfor5.088)
============>>>>>applicationStartedEventistrigged
============>>>>>End
============>>>>>applicationReadyEventistrigged
============>>>>>End

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SpringBoot Application事件监听的实现方案

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