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
})
