springboot入门（hello world）

 
        
            org.springframework.boot
            spring-boot-starter-web
             2.5.1
        
    

@SpringBootApplication
public class HelloMain {
    public static void main(String[] args) {
        SpringApplication.run(HelloMain.class,args);
    }
}

@RestController
public class HelloController {
    @RequestMapping("/hello")
    public String hello(){
        return "HelloWorld";
    }
}