@SpringBootApplication
public class DemoApplication {

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

}

---分割线---

@RestController
@RequestMapping("/")
public class TestController {

    @GetMapping("/test")
    public String test() {
        return "test";
    }

}

---分割线---

server:
  port: 8080

---复制粘贴测试区域---
你可以在这里进行粘贴测试