JSON data
By default, when developers create a new SpringBoot project will add a Web relies, in this dependence will default join jackson-databind as Json processor.
@RestController
A combination of notes, equal to @Controller and ResponseBody
Static resources
SpringBoot created for SpringMVC of automated configuration are WebMvcAutoConfiguration class, developers using IntelliJ IDEA SpringBoot project will create a static default directory, usually on the static resources to this directory.