一、@SpringBootApplication：

1、介绍：这是一个组合注解：包含了

@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}
)}
)

 SpringBootApplication注解等价于以默认属性使用@Configuration、@EnableAutoConfiguration和@ComponentScan。

2、禁用自动装配项：

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,SecurityAutoConfiguration.class
})