springmvc 组合注解

组合注解的意思就是一个注解中包含多个注解。在springmvc 的@RestController中，你就可发现.

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController {/*** The value may indicate a suggestion for a logical component name,* to be turned into a Spring bean in case of an autodetected component.* @return the suggested component name, if any* @since 4.0.1*/String value() default "";}