springboot @Configuration 注解

@EnableAutoConfiguration 注解我们看下它的源码，发现它是一个组合注解

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import({EnableAutoConfigurationImportSelector.class}) public @interface EnableAutoConfiguration {
String ENABLED_OVERRIDE_PROPERTY = "spring.boot.enableautoconfiguration";

Class[] exclude() default {};

String[] excludeName() default {};
​

}

@EnableAutoConfiguration 注解大致处理流程就是： 

1、先去扫描已经被 @Component 所注释的类，当然会先判断有没有 @Condition 相关的注解。 
2、然后递归的取扫描该类中的 @ImportResource，@PropertySource，@ComponentScan，@Bean，@Import。一直处理完。

参考：@EnableAutoConfiguration 配置解释

@Configuration
@EnableAutoConfiguration public class RedisConfig {
@Bean
@ConfigurationProperties(prefix = "spring.redis.pool") public JedisPoolConfig getRedisConfig() {
JedisPoolConfig config = new JedisPoolConfig(); return config;
}

@Bean
@ConfigurationProperties(prefix = "spring.redis") public JedisConnectionFactory getConnectionFactory() {
    JedisConnectionFactory factory = new JedisConnectionFactory();
    factory.setUsePool(true);
    JedisPoolConfig config = getRedisConfig();
    factory.setPoolConfig(config); return factory;
}

@Bean public RedisTemplate getRedisTemplate() {
    JedisConnectionFactory factory = getConnectionFactory();
    RedisTemplate template = new StringRedisTemplate(factory); return template;
}
​

}