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Spring Boot 3.x特性-Spring Application

文章目录​

    • 1.SpringApplication使用
  • 2.应用启动失败
  • 3.懒加载
  • 4.自定义启动Banner
  • 5.定制SpringApplication
  • 6.流畅的构建器API
  • 7.Web环境
  • 8.访问程序参数
  • 9.ApplicationRunner & CommandLineRunner
  • 10.应用程序退出

SpringApplication类是Spring Boot应用程序启动的核心，它提供了一种便捷的方式( SpringApplication.run())从 main方法启动整个Spring应用程序。默认情况下，SpringApplication将执行以下步骤引导应用程序:

1、 创建一个ApplicationContext实例；
2、 注册一个CommandLinePropertySource以将命令行参数作为Spring属性；
3、 刷新应用程序上下文，加载所有单例bean；
4、 触发CommandLineRunnerbeans；

1.SpringApplication使用​

@SpringBootApplication
public class SpringapplicationDetailApplication {
   
     

    public static void main(String[] args) {
   
     
        SpringApplication.run(SpringapplicationDetailApplication.class, args);
    }

}

启动程序看到以下的内容输出.

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _ | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::             (v3.0.0-M2)

2022-04-11 00:37:50.001  INFO 74256 --- [           main] m.r.s.SpringapplicationDetailApplication : Starting SpringapplicationDetailApplication using Java 17.0.2 with PID 74256 
2022-04-11 00:37:50.003  INFO 74256 --- [           main] m.r.s.SpringapplicationDetailApplication : No active profile set, falling back to 1 default profile: "default"
2022-04-11 00:37:50.539  INFO 74256 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-04-11 00:37:50.546  INFO 74256 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-04-11 00:37:50.546  INFO 74256 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/10.0.18]
2022-04-11 00:37:50.604  INFO 74256 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-04-11 00:37:50.606  INFO 74256 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 567 ms
2022-04-11 00:37:50.831  INFO 74256 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-04-11 00:37:50.838  INFO 74256 --- [           main] m.r.s.SpringapplicationDetailApplication : Started SpringapplicationDetailApplication in 1.058 seconds (JVM running for 1.43)