Spring Boot CLI - Exemplo de Hello World
Neste exemplo, criaremos um aplicativo da Web baseado em Spring Boot + MVC + Rest.
Etapa 1: Criar pasta de origem
Crie uma pasta FirstApplication em E:\Test folder.
Etapa 2: Criar arquivo de origem
Crie o arquivo FirstApplication.groovy em E:\Test folder com o seguinte código-fonte -
@RestController
class FirstApplication {
@RequestMapping("/")
String welcome() {
"Welcome to TutorialsPoint.Com"
}
}Etapa 3: execute o aplicativo
Digite o seguinte comando -
E:/Test/> spring run FirstApplication.groovyAgora, o Spring Boot CLI entrará em ação, baixará as dependências necessárias, executará o tomcat integrado, implantará o aplicativo e o iniciará. Você pode ver a seguinte saída no console -
Resolving dependencies..........................................................
................................................................................
........................
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _> | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.8.RELEASE)
2017-11-07 17:36:55.703 INFO 5528 --- [ runner-0] o.s.boot.SpringApplication:
Starting application on ...
2017-11-07 17:36:55.707 INFO 5528 --- [ runner-0] o.s.boot.SpringApplication:
No active profile set, falling back to default profiles: default
2017-11-07 17:36:56.067 INFO 5528 --- [ runner-0] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4c108392: startup date [Tue Nov 07 17:36:
56 IST 2017]; root of context hierarchy
2017-11-07 17:36:57.327 INFO 5528 --- [ runner-0] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-11-07 17:36:57.346 INFO 5528 --- [ runner-0] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-11-07 17:36:57.354 INFO 5528 --- [ runner-0] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2017-11-07 17:36:57.537 INFO 5528 --- [ost-startStop-1] org.apache.catalina.loader.WebappLoader : Unknown loader org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@41bfad4f class org.springframew
ork.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader
2017-11-07 17:36:57.567 INFO 5528 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-11-07 17:36:57.567 INFO 5528 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1500 ms
2017-11-07 17:36:57.725 INFO 5528 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-11-07 17:36:57.730 INFO 5528 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-11-07 17:36:57.730 INFO 5528 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-11-07 17:36:57.730 INFO 5528 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-11-07 17:36:57.730 INFO 5528 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-11-07 17:36:58.012 INFO 5528 --- [ runner-0] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4c108392: startup date [Tue Nov 07 17:36:56 IST 2017]; root of context hierarchy
2017-11-07 17:36:58.066 INFO 5528 --- [ runner-0] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String FirstApplication.home()
2017-11-07 17:36:58.070 INFO 5528 --- [ runner-0] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity
> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2017-11-07 17:36:58.071 INFO 5528 --- [ runner-0] 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) 2017-11-07 17:36:58.096 INFO 5528 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-07 17:36:58.096 INFO 5528 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-07 17:36:58.129 INFO 5528 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-07 17:36:58.626 INFO 5528 --- [ runner-0] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2017-11-07 17:36:58.696 INFO 5528 --- [ runner-0] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2017-11-07 17:36:58.699 INFO 5528 --- [ runner-0] o.s.boot.SpringApplication : Started application in 3.529 seconds (JVM running for 190.196) 2017-11-07 17:37:20.217 INFO 5528 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet' 2017-11-07 17:37:20.218 INFO 5528 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2017-11-07 17:37:20.238 INFO 5528 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 20 ms
Etapa 4: navegue pelo aplicativo no navegador
Nosso aplicativo de descanso com base na mola está pronto. Abrir url como "http://localhost:8080/"e você verá a seguinte saída -
Hello WorldPontos importantes
Considere os seguintes pontos para entender como o Spring CLI funciona.
Todos os JARs de dependência são baixados apenas pela primeira vez.
O Spring CLI detecta automaticamente quais JARs de dependência devem ser baixados com base nas classes e anotações usadas no código.
Finalmente, após a compilação do código, implante o arquivo war em um tomcat integrado e inicie o servidor tomcat integrado na porta padrão 8080.