自动化配置

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

@Configuration
public class WebConfiguration {
    ......    
}

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@Configuration
@Import(WebConfiguration.class)
public class WebAutoConfiguration {
    ......   
}

src/main/resources/META-INF/spring.factories

#自动装配
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\com.xxx.WebAutoConfiguration

@SpringBootApplication是SpringBoot的核心注解配置类。

条件化自动配置

@ConditionalOnBean
@ConditionalOnClass
@ConditionalOnMissingBean
@ConditionalOnProperty
@ConditionalOnResource
@ConditionalOnSingleCandidate
@ConditionalOnWebApplication

spring-boot-starter