Springbootcli 简明教程

Spring Boot CLI - Hello World Example

在此示例中，我们将创建一个基于 Spring Boot + MVC + Rest 的 Web 应用程序。

In this example, we’ll create a Spring Boot + MVC + Rest based Web application.

Step 1: Create source Folder

在 E:\Test 文件夹中创建 FirstApplication 文件夹。

Create a folder FirstApplication in E:\Test folder.

Step 2: Create Source File

在 E:\Test 文件夹中使用以下源代码创建 FirstApplication.groovy 文件。

Create FirstApplication.groovy file in E:\Test folder with following source code.

@RestController
class FirstApplication {
   @RequestMapping("/")
   String welcome() {
      "Welcome to TutorialsPoint.Com"
   }
}

Step 3: Run the application

键入以下命令

Type the following command

E:/Test/> spring run FirstApplication.groovy

现在 Spring Boot CLI 将发挥作用，下载所需的依赖项，运行嵌入式 Tomcat，部署应用程序并启动它。您可以在控制台上看到以下输出。

Now Spring Boot CLI will come into action, download required dependencies, run the embedded tomcat, deploy the application and start it. You can see the following output on console.

E:\Test>spring run FirstApplication.groovy
Resolving dependencies...............................

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.3)

2022-02-03 11:12:42.683  INFO 6956 --- [       runner-0] o.s.boot.SpringApplication               : Starting application using Java 11.0.11 on DESKTOP-86KD9FC with PID 6956 (started by intel in F:\Test)
2022-02-03 11:12:42.710  INFO 6956 --- [       runner-0] o.s.boot.SpringApplication               : No active profile set, falling back to default profiles: default
2022-02-03 11:12:45.110  INFO 6956 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-02-03 11:12:45.138  INFO 6956 --- [       runner-0] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-02-03 11:12:45.139  INFO 6956 --- [       runner-0] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-03 11:12:45.229  INFO 6956 --- [       runner-0] org.apache.catalina.loader.WebappLoader  : Unknown class loader [org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader@8646db9] of class [class org.springframework.boot.cli.compiler.ExtendedGroovyClassLoader$DefaultScopeParentClassLoader]
2022-02-03 11:12:45.333  INFO 6956 --- [       runner-0] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-02-03 11:12:45.333  INFO 6956 --- [       runner-0] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2124 ms
2022-02-03 11:12:46.901  INFO 6956 --- [       runner-0] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-03 11:12:46.930  INFO 6956 --- [       runner-0] o.s.boot.SpringApplication               : Started application in 5.416 seconds (JVM running for 49.049)
2022-02-03 11:13:48.910  INFO 6956 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-02-03 11:13:48.912  INFO 6956 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2022-02-03 11:13:48.915  INFO 6956 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 3 ms

Step 4: Browse the application in Browser

基于 Spring 的休息应用程序现已准备就绪。打开 URL " http://localhost:8080/ "，您将看到以下输出。

Our spring based rest application is now ready. Open url as "http://localhost:8080/" and you will see the following output.

Welcome to TutorialsPoint.Com

Points to consider

Spring CLI 执行以下操作。

Following actions are taken by Spring CLI.

  1. All dependency JARs are downloaded for the first time only.

  2. Spring CLI automatically detects which dependency JARs are to be downloaded based on the classes and annotations used in code.

  3. Finally it compiles the code, deploy the war on a embedded tomcat, start embedded tomcat server on the default port 8080.