Spring Boot CLI入門程式
在這個例子中，我們將建立一個基於Spring Boot + MVC + Rest的Web應用程式。
第1步:建立原始檔夾
在D:\worksp檔案夾中建立檔案夾FirstApplication。
第2步:建立原始檔
使用以下原始碼在D:\worksp檔案夾中建立FirstApplication.groovy檔案 -
@RestController
class FirstApplication {
@RequestMapping("/")
String welcome() {
"Welcome to Tw511.Com"
}
}
第3步:執行應用程式
輸入以下命令 -
D:\worksp\springboot-cli> spring run FirstApplication.groovy
現在，Spring Boot CLI將開始執行，下載所需的依賴項，執行嵌入的tomcat，部署應用程式並啟動它。可以在控制台上看到類似以下輸出 -
D:\worksp\springboot-cli>spring run FirstApplication.groovy
Resolving dependencies.................................................
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.5.RELEASE)
2018-09-25 09:29:51.393 INFO 12532 --- [ runner-0] o.s.boot.SpringApplication : Starting application on DESKTOP-CAN8JLM with PID 12532 (started by hema in D:\worksp\springboot-cli)
2018-09-25 09:29:51.405 INFO 12532 --- [ runner-0] o.s.boot.SpringApplication : No active profile set, falling back to default profiles: default
2018-09-25 09:29:51.726 INFO 12532 --- [ runner-0] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@66dfc8e0: startup date [Tue Sep 25 09:29:51 CST 2018]; root of context hierarchy
2018-09-25 09:29:53.881 INFO 12532 --- [ runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-09-25 09:29:53.944 INFO 12532 --- [ runner-0] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-09-25 09:29:53.946 INFO 12532 --- [ runner-0] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.34
2018-09-25 09:29:53.969 INFO 12532 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\PuTTY\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\WINDOWS\System32\OpenSSH\;D:\wamp\bin\php\php7.0.29;C:\Program Files (x86)\nodejs\;D:\software\spring-2.0.5.RELEASE\bin;D:\Program Files\Python3\Scripts\;D:\Program Files\Python3\;C:\Users\hema\AppData\Local\Microsoft\WindowsApps;C:\Users\hema\AppData\Roaming\npm;.]
2018-09-25 09:29:54.187 INFO 12532 --- [ost-startStop-1] org.apache.catalina.loader.WebappLoader : Unknown loader org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@76960b9d class org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader
2018-09-25 09:29:54.288 INFO 12532 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-09-25 09:29:54.289 INFO 12532 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2563 ms
2018-09-25 09:29:54.443 INFO 12532 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-09-25 09:29:54.452 INFO 12532 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-09-25 09:29:54.452 INFO 12532 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-09-25 09:29:54.452 INFO 12532 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-09-25 09:29:54.454 INFO 12532 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-09-25 09:29:54.629 INFO 12532 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-25 09:29:54.847 INFO 12532 --- [ runner-0] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@66dfc8e0: startup date [Tue Sep 25 09:29:51 CST 2018]; root of context hierarchy
2018-09-25 09:29:54.970 INFO 12532 --- [ runner-0] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String FirstApplication.welcome()
2018-09-25 09:29:54.975 INFO 12532 --- [ runner-0] 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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-09-25 09:29:54.978 INFO 12532 --- [ 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.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-09-25 09:29:55.026 INFO 12532 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-25 09:29:55.028 INFO 12532 --- [ runner-0] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-25 09:29:55.894 INFO 12532 --- [ runner-0] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-09-25 09:29:56.022 INFO 12532 --- [ runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-09-25 09:29:56.033 INFO 12532 --- [ runner-0] o.s.boot.SpringApplication : Started application in 5.404 seconds (JVM running for 64.879)
2018-09-25 09:38:27.210 INFO 12532 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-09-25 09:38:27.211 INFO 12532 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-09-25 09:38:27.242 INFO 12532 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 29 ms
第4步:在瀏覽器中瀏覽應用程式
上面基於Spring應用現已準備就緒。開啟網址為http:// localhost:8080/ ，將看到以下輸出 -
理解關鍵執行過程
以下操作由Spring CLI執行 -
- 所有依賴項JAR僅在第一次使用時下載。
- Spring CLI根據程式碼中使用的類和注釋自動檢測要下載的依賴項JAR。
- 最後，它編譯程式碼，在嵌入式tomcat上部署
war，在預設埠8080上啟動嵌入式tomcat伺服器。