SpringBoot启动原理！

容器启动

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SpringBoot一般是指定容器启动Main方法，然后以命令行方式启动Jar包。

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

@SpringBootApplication注解：

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@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 {

核心注解：

@EnableAutoConfiguration：

  • 借助@Import的帮助，将所有符合自动配置条件的Bean定义加载到IOC容器。
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@SuppressWarnings("deprecation")
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(EnableAutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {

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