@SpringBootApplication //是SpringBoot的配置類
public class SpringbootVueApplication {

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

}

SpringbootApplication所包含的配置資訊：

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(excludeFilters 
 
= { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),
        @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })
public @interface SpringBootApplication {

@EnableAutoConfiguration：開啟自動配置功能

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(AutoConfigurationImportSelector.
 
class)
public @interface EnableAutoConfiguration {

@AutoConfigurationPackage：自動配置包，將主配置類（@SpringBootApplication ）所在的包以及所有的自保裡面的元件放在容器中，自動匹配值類就生效，幫我們進行自動配置工作。

J2EE的整體整合方案和自動配置都在